externals/fmt: Update fmt to 5.3.0

Merge commit '0066ad2d3879f4604b3a2644128cf5d447e54eef' into HEAD

externals/fmt/.gitignore

@@ -31,3 +31,4 @@ CMakeFiles
 FMT.build
 Makefile
 run-msbuild.bat
+fmt.pc

externals/fmt/.travis.yml

@@ -84,42 +84,41 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
       # Android
-#    - language: android
-#      android:
-#      addons:
-#        apt:
-#          update: true
-#      components:
-#        - tools
-#        - platform-tools
-#        - android-21
-#        - sys-img-armeabi-v7a-android-21
-#      env:
-#        - ANDROID=true
-#      before_install:
-#        - git submodule update --init --recursive
-#        - sudo apt-get install wget unzip tree
-#      install:
-#        # Accept SDK Licenses + Install NDK
-#        - yes | sdkmanager --update > /dev/null 2>&1
-#        - sdkmanager ndk-bundle > /dev/null 2>&1
-#        # Download Gradle 4.3.1 
-#        - wget https://services.gradle.org/distributions/gradle-4.3.1-bin.zip
-#        - mkdir -p gradle
-#        - unzip -q -d ./gradle gradle-4.3.1-bin.zip
-#        - export GRADLE=${TRAVIS_BUILD_DIR}/gradle/gradle-4.3.1/bin/gradle
-#      before_script:
-#        - bash $GRADLE --version
-#        - cd ./support
-#      script:
-#        - bash $GRADLE clean assemble
-#      after_success:
-#        - cd ${TRAVIS_BUILD_DIR}
-#        - tree ./libs
-  allow_failures:
-      # Errors
-    - env: COMPILER=g++-4.4 BUILD=Debug STANDARD=11
-      compiler: gcc
+    - language: android
+      addons:
+        apt:
+          update: true
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - wget
+            - unzip
+            - tree
+      android:
+        components:
+          - tools
+          - platform-tools
+          - android-21
+      env:
+        - ANDROID=true
+      before_install:
+        # Download/Install Gradle 
+        - wget https://services.gradle.org/distributions/gradle-4.10.2-bin.zip
+        - mkdir -p gradle
+        - unzip -q -d ./gradle gradle-4.10.2-bin.zip
+        - export GRADLE=gradle/gradle-4.10.2/bin/gradle
+        - bash $GRADLE --version
+      install:
+        # Accept SDK Licenses + Install NDK
+        - yes | sdkmanager --update > /dev/null 2>&1
+        - sdkmanager ndk-bundle > /dev/null 2>&1
+      before_script:
+        - pushd ./support
+      script:
+        - bash ../$GRADLE clean assemble
+      after_success:
+        - popd;
+        - tree ./libs
 
 before_script:
   - if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then export CXX=${COMPILER}; fi

externals/fmt/CMakeLists.txt

@@ -68,16 +68,17 @@ include(CheckCXXCompilerFlag)
 
 if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
   set(PEDANTIC_COMPILE_FLAGS -pedantic-errors -Wall -Wextra -pedantic
-      -Wold-style-cast -Wfloat-equal -Wlogical-op -Wundef
-      -Wredundant-decls -Wshadow -Wwrite-strings -Wpointer-arith
+      -Wold-style-cast -Wundef
+      -Wredundant-decls -Wwrite-strings -Wpointer-arith
       -Wcast-qual -Wformat=2 -Wmissing-include-dirs
       -Wcast-align -Wnon-virtual-dtor
       -Wctor-dtor-privacy -Wdisabled-optimization
       -Winvalid-pch -Woverloaded-virtual
-      -Wno-ctor-dtor-privacy -Wno-dangling-else -Wno-float-equal
-      -Wno-format-nonliteral -Wno-sign-conversion -Wno-shadow)
+      -Wconversion
+      -Wno-ctor-dtor-privacy -Wno-format-nonliteral -Wno-shadow)
   if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.6)
-      set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS} -Wnoexcept)
+      set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS} -Wnoexcept
+         -Wno-dangling-else -Wno-unused-local-typedefs)
   endif ()
   if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
       set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS} -Wdouble-promotion
@@ -88,29 +89,17 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
       set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS} -Wshift-overflow=2
           -Wnull-dereference -Wduplicated-cond)
   endif ()
-
   set(WERROR_FLAG -Werror)
 endif ()
 
 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-  set(PEDANTIC_COMPILE_FLAGS -Weverything -Wpedantic
-      -Wno-weak-vtables -Wno-padded -Wno-gnu-statement-expression
-      -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-reserved-id-macro
-      -Wno-global-constructors -Wno-disabled-macro-expansion
-      -Wno-switch-enum -Wno-documentation-unknown-command
-      -Wno-unused-member-function
-      -Wno-format-nonliteral -Wno-missing-noreturn -Wno-undefined-func-template
-      -Wno-shadow -Wno-sign-conversion -Wno-used-but-marked-unused
-      -Wno-covered-switch-default -Wno-missing-prototypes
-      -Wno-missing-variable-declarations -Wno-double-promotion)
-
-  set(WERROR_FLAG -Werror)
-
-  check_cxx_compiler_flag(-Wno-zero-as-null-pointer-constant HAS_NULLPTR_WARNING)
+  set(PEDANTIC_COMPILE_FLAGS -Wall -Wextra -pedantic -Wconversion -Wno-sign-conversion)
+  check_cxx_compiler_flag(-Wzero-as-null-pointer-constant HAS_NULLPTR_WARNING)
   if (HAS_NULLPTR_WARNING)
     set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS}
-        -Wno-zero-as-null-pointer-constant)
+        -Wzero-as-null-pointer-constant)
   endif ()
+  set(WERROR_FLAG -Werror)
 endif ()
 
 if (MSVC)
@@ -150,8 +139,8 @@ function(add_headers VAR)
 endfunction()
 
 # Define the fmt library, its includes and the needed defines.
-add_headers(FMT_HEADERS color.h core.h format.h format-inl.h ostream.h printf.h
-                        time.h ranges.h)
+add_headers(FMT_HEADERS chrono.h color.h core.h format.h format-inl.h locale.h
+                        ostream.h printf.h time.h ranges.h)
 set(FMT_SOURCES src/format.cc)
 if (HAVE_OPEN)
   add_headers(FMT_HEADERS posix.h)
@@ -202,6 +191,7 @@ if (FMT_INSTALL)
     "Installation directory for cmake files, relative to ${CMAKE_INSTALL_PREFIX}.")
   set(version_config ${PROJECT_BINARY_DIR}/fmt-config-version.cmake)
   set(project_config ${PROJECT_BINARY_DIR}/fmt-config.cmake)
+  set(pkgconfig ${PROJECT_BINARY_DIR}/fmt.pc)
   set(targets_export_name fmt-targets)
 
   set (INSTALL_TARGETS fmt)
@@ -215,11 +205,18 @@ if (FMT_INSTALL)
   set(FMT_INC_DIR ${CMAKE_INSTALL_INCLUDEDIR}/fmt CACHE STRING
       "Installation directory for include files, relative to ${CMAKE_INSTALL_PREFIX}.")
 
+  set(FMT_PKGCONFIG_DIR "${CMAKE_INSTALL_PREFIX}/share/pkgconfig" CACHE PATH
+    "Installation directory for pkgconfig (.pc) files, relative to ${CMAKE_INSTALL_PREFIX}.")
+
   # Generate the version, config and target files into the build directory.
   write_basic_package_version_file(
     ${version_config}
     VERSION ${FMT_VERSION}
     COMPATIBILITY AnyNewerVersion)
+  configure_file(
+    "${PROJECT_SOURCE_DIR}/support/cmake/fmt.pc.in"
+    "${pkgconfig}"
+    @ONLY)
   configure_package_config_file(
     ${PROJECT_SOURCE_DIR}/support/cmake/fmt-config.cmake.in
     ${project_config}
@@ -239,7 +236,10 @@ if (FMT_INSTALL)
   # Install the library and headers.
   install(TARGETS ${INSTALL_TARGETS} EXPORT ${targets_export_name}
           DESTINATION ${FMT_LIB_DIR})
+
+  install(FILES $<TARGET_PDB_FILE:${INSTALL_TARGETS}> DESTINATION ${FMT_LIB_DIR} OPTIONAL)
   install(FILES ${FMT_HEADERS} DESTINATION ${FMT_INC_DIR})
+  install(FILES "${pkgconfig}" DESTINATION "${FMT_PKGCONFIG_DIR}")
 endif ()
 
 if (FMT_DOC)

externals/fmt/ChangeLog.rst

@@ -1,3 +1,239 @@
+5.3.0 - 2018-12-28
+------------------
+
+* Introduced experimental chrono formatting support:
+
+  .. code:: c++
+
+     #include <fmt/chrono.h>
+
+     int main() {
+       using namespace std::literals::chrono_literals;
+       fmt::print("Default format: {} {}\n", 42s, 100ms);
+       fmt::print("strftime-like format: {:%H:%M:%S}\n", 3h + 15min + 30s);
+     }
+
+  prints::
+
+     Default format: 42s 100ms
+     strftime-like format: 03:15:30
+
+* Added experimental support for emphasis (bold, italic, underline,
+  strikethrough), colored output to a file stream, and improved colored
+  formatting API
+  (`#961 <https://github.com/fmtlib/fmt/pull/961>`_,
+  `#967 <https://github.com/fmtlib/fmt/pull/967>`_,
+  `#973 <https://github.com/fmtlib/fmt/pull/973>`_):
+
+  .. code:: c++
+
+     #include <fmt/color.h>
+
+     int main() {
+       print(fg(fmt::color::crimson) | fmt::emphasis::bold,
+             "Hello, {}!\n", "world");
+       print(fg(fmt::color::floral_white) | bg(fmt::color::slate_gray) |
+             fmt::emphasis::underline, "Hello, {}!\n", "мир");
+       print(fg(fmt::color::steel_blue) | fmt::emphasis::italic,
+             "Hello, {}!\n", "世界");
+     }
+
+  prints the following on modern terminals with RGB color support:
+
+  .. image:: https://user-images.githubusercontent.com/576385/
+             50405788-b66e7500-076e-11e9-9592-7324d1f951d8.png
+
+  Thanks `@Rakete1111 (Nicolas) <https://github.com/Rakete1111>`_.
+
+* Added support for 4-bit terminal colors
+  (`#968 <https://github.com/fmtlib/fmt/issues/968>`_,
+  `#974 <https://github.com/fmtlib/fmt/pull/974>`_)
+
+  .. code:: c++
+
+     #include <fmt/color.h>
+
+     int main() {
+       print(fg(fmt::terminal_color::red), "stop\n");
+     }
+
+  Note that these colors vary by terminal:
+
+  .. image:: https://user-images.githubusercontent.com/576385/
+             50405925-dbfc7e00-0770-11e9-9b85-333fab0af9ac.png
+
+  Thanks `@Rakete1111 (Nicolas) <https://github.com/Rakete1111>`_.
+
+* Parameterized formatting functions on the type of the format string
+  (`#880 <https://github.com/fmtlib/fmt/issues/880>`_,
+  `#881 <https://github.com/fmtlib/fmt/pull/881>`_,
+  `#883 <https://github.com/fmtlib/fmt/pull/883>`_,
+  `#885 <https://github.com/fmtlib/fmt/pull/885>`_,
+  `#897 <https://github.com/fmtlib/fmt/pull/897>`_,
+  `#920 <https://github.com/fmtlib/fmt/issues/920>`_).
+  Any object of type ``S`` that has an overloaded ``to_string_view(const S&)``
+  returning ``fmt::string_view`` can be used as a format string:
+
+  .. code:: c++
+
+     namespace my_ns {
+     inline string_view to_string_view(const my_string& s) {
+       return {s.data(), s.length()};
+     }
+     }
+
+     std::string message = fmt::format(my_string("The answer is {}."), 42);
+
+  Thanks `@DanielaE (Daniela Engert) <https://github.com/DanielaE>`_.
+
+* Made ``std::string_view`` work as a format string
+  (`#898 <https://github.com/fmtlib/fmt/pull/898>`_):
+
+  .. code:: c++
+
+     auto message = fmt::format(std::string_view("The answer is {}."), 42);
+
+  Thanks `@DanielaE (Daniela Engert) <https://github.com/DanielaE>`_.
+
+* Added wide string support to compile-time format string checks
+  (`#924 <https://github.com/fmtlib/fmt/pull/924>`_):
+
+  .. code:: c++
+
+     print(fmt(L"{:f}"), 42); // compile-time error: invalid type specifier
+
+  Thanks `@XZiar <https://github.com/XZiar>`_.
+
+* Made colored print functions work with wide strings
+  (`#867 <https://github.com/fmtlib/fmt/pull/867>`_):
+
+  .. code:: c++
+
+     #include <fmt/color.h>
+
+     int main() {
+       print(fg(fmt::color::red), L"{}\n", 42);
+     }
+
+  Thanks `@DanielaE (Daniela Engert) <https://github.com/DanielaE>`_.
+
+* Introduced experimental Unicode support
+  (`#628 <https://github.com/fmtlib/fmt/issues/628>`_,
+  `#891 <https://github.com/fmtlib/fmt/pull/891>`_):
+
+  .. code:: c++
+
+     using namespace fmt::literals;
+     auto s = fmt::format("{:*^5}"_u, "🤡"_u); // s == "**🤡**"_u
+
+* Improved locale support:
+
+  .. code:: c++
+
+     #include <fmt/locale.h>
+
+     struct numpunct : std::numpunct<char> {
+      protected:
+       char do_thousands_sep() const override { return '~'; }
+     };
+
+     std::locale loc;
+     auto s = fmt::format(std::locale(loc, new numpunct()), "{:n}", 1234567);
+     // s == "1~234~567"
+
+* Constrained formatting functions on proper iterator types
+  (`#921 <https://github.com/fmtlib/fmt/pull/921>`_):
+  Thanks `@DanielaE (Daniela Engert) <https://github.com/DanielaE>`_.
+
+* Added ``make_printf_args`` and ``make_wprintf_args`` functions
+  (`#934 <https://github.com/fmtlib/fmt/pull/934>`_).
+  Thanks `@tnovotny <https://github.com/tnovotny>`_.
+
+* Deprecated ``fmt::visit``, ``parse_context``, and ``wparse_context``.
+  Use ``fmt::visit_format_arg``, ``format_parse_context``, and
+  ``wformat_parse_context`` instead.
+
+* Removed undocumented ``basic_fixed_buffer`` which has been superseded by the
+  iterator-based API
+  (`#873 <https://github.com/fmtlib/fmt/issues/873>`_,
+  `#902 <https://github.com/fmtlib/fmt/pull/902>`_).
+  Thanks `@superfunc (hollywood programmer) <https://github.com/superfunc>`_.
+
+* Disallowed repeated leading zeros in an argument ID:
+
+  .. code:: c++
+
+     fmt::print("{000}", 42); // error
+
+* Reintroduced support for gcc 4.4.
+
+* Fixed compilation on platforms with exotic ``double``
+  (`#878 <https://github.com/fmtlib/fmt/issues/878>`_).
+
+* Improved documentation
+  (`#164 <https://github.com/fmtlib/fmt/issues/164>`_,
+  `#877 <https://github.com/fmtlib/fmt/issues/877>`_,
+  `#901 <https://github.com/fmtlib/fmt/pull/901>`_,
+  `#906 <https://github.com/fmtlib/fmt/pull/906>`_,
+  `#979 <https://github.com/fmtlib/fmt/pull/979>`_).
+  Thanks `@kookjr (Mathew Cucuzella) <https://github.com/kookjr>`_,
+  `@DarkDimius (Dmitry Petrashko) <https://github.com/DarkDimius>`_,
+  `@HecticSerenity <https://github.com/HecticSerenity>`_.
+
+* Added pkgconfig support which makes it easier to consume the library from
+  meson and other build systems
+  (`#916 <https://github.com/fmtlib/fmt/pull/916>`_).
+  Thanks `@colemickens (Cole Mickens) <https://github.com/colemickens>`_.
+
+* Various build improvements
+  (`#909 <https://github.com/fmtlib/fmt/pull/909>`_,
+  `#926 <https://github.com/fmtlib/fmt/pull/926>`_,
+  `#937 <https://github.com/fmtlib/fmt/pull/937>`_,
+  `#953 <https://github.com/fmtlib/fmt/pull/953>`_,
+  `#959 <https://github.com/fmtlib/fmt/pull/959>`_).
+  Thanks `@tchaikov (Kefu Chai) <https://github.com/tchaikov>`_,
+  `@luncliff (Park DongHa) <https://github.com/luncliff>`_,
+  `@AndreasSchoenle (Andreas Schönle) <https://github.com/AndreasSchoenle>`_,
+  `@hotwatermorning <https://github.com/hotwatermorning>`_,
+  `@Zefz (JohanJansen) <https://github.com/Zefz>`_.
+
+* Improved ``string_view`` construction performance
+  (`#914 <https://github.com/fmtlib/fmt/pull/914>`_).
+  Thanks `@gabime (Gabi Melman) <https://github.com/gabime>`_.
+
+* Fixed non-matching char types
+  (`#895 <https://github.com/fmtlib/fmt/pull/895>`_).
+  Thanks `@DanielaE (Daniela Engert) <https://github.com/DanielaE>`_.
+
+* Fixed ``format_to_n`` with ``std::back_insert_iterator``
+  (`#913 <https://github.com/fmtlib/fmt/pull/913>`_).
+  Thanks `@DanielaE (Daniela Engert) <https://github.com/DanielaE>`_.
+
+* Fixed locale-dependent formatting
+  (`#905 <https://github.com/fmtlib/fmt/issues/905>`_).
+
+* Fixed various compiler warnings and errors
+  (`#882 <https://github.com/fmtlib/fmt/pull/882>`_,
+  `#886 <https://github.com/fmtlib/fmt/pull/886>`_,
+  `#933 <https://github.com/fmtlib/fmt/pull/933>`_,
+  `#941 <https://github.com/fmtlib/fmt/pull/941>`_,
+  `#931 <https://github.com/fmtlib/fmt/issues/931>`_,
+  `#943 <https://github.com/fmtlib/fmt/pull/943>`_,
+  `#954 <https://github.com/fmtlib/fmt/pull/954>`_,
+  `#956 <https://github.com/fmtlib/fmt/pull/956>`_,
+  `#962 <https://github.com/fmtlib/fmt/pull/962>`_,
+  `#965 <https://github.com/fmtlib/fmt/issues/965>`_,
+  `#977 <https://github.com/fmtlib/fmt/issues/977>`_,
+  `#983 <https://github.com/fmtlib/fmt/pull/983>`_,
+  `#989 <https://github.com/fmtlib/fmt/pull/989>`_).
+  Thanks `@Luthaf (Guillaume Fraux) <https://github.com/Luthaf>`_,
+  `@stevenhoving (Steven Hoving) <https://github.com/stevenhoving>`_,
+  `@christinaa (Kristina Brooks) <https://github.com/christinaa>`_,
+  `@lgritz (Larry Gritz) <https://github.com/lgritz>`_,
+  `@DanielaE (Daniela Engert) <https://github.com/DanielaE>`_,
+  `@0x8000-0000 (Sign Bit) <https://github.com/0x8000-0000>`_,
+  `@liuping1997 <https://github.com/liuping1997>`_.
+
 5.2.1 - 2018-09-21
 ------------------
 

externals/fmt/README.rst

@@ -30,7 +30,7 @@ Features
   of `str.format <https://docs.python.org/2/library/stdtypes.html#str.format>`_
   in Python.
 * Safe `printf implementation
-  <http://fmtlib.net/latest/api.html#printf-formatting-functions>`_ including
+  <http://fmtlib.net/latest/api.html#printf-formatting>`_ including
   the POSIX extension for positional arguments.
 * Support for user-defined types.
 * High speed: performance of the format API is close to that of glibc's `printf
@@ -126,7 +126,7 @@ Formatting of user-defined types is supported via a simple
 
       template <typename FormatContext>
       auto format(const date &d, FormatContext &ctx) {
-        return format_to(ctx.begin(), "{}-{}-{}", d.year, d.month, d.day);
+        return format_to(ctx.out(), "{}-{}-{}", d.year, d.month, d.day);
       }
     };
 
@@ -153,19 +153,27 @@ which take arbitrary arguments (`godbolt <https://godbolt.org/g/MHjHVf>`_):
     report_error("file not found: {}", path);
 
 Note that ``vreport_error`` is not parameterized on argument types which can
-improve compile times and reduce code size compared to fully parameterized version.
+improve compile times and reduce code size compared to fully parameterized
+version.
 
 Projects using this library
 ---------------------------
 
-* `0 A.D. <http://play0ad.com/>`_: A free, open-source, cross-platform real-time strategy game
+* `0 A.D. <http://play0ad.com/>`_: A free, open-source, cross-platform real-time
+  strategy game
 
 * `AMPL/MP <https://github.com/ampl/mp>`_:
   An open-source library for mathematical programming
   
-* `AvioBook <https://www.aviobook.aero/en>`_: A comprehensive aircraft operations suite
+* `AvioBook <https://www.aviobook.aero/en>`_: A comprehensive aircraft
+  operations suite
   
-* `CUAUV <http://cuauv.org/>`_: Cornell University's autonomous underwater vehicle
+* `Celestia <https://celestia.space/>`_: Real-time 3D visualization of space
+
+* `Ceph <https://ceph.com/>`_: A scalable distributed storage system
+
+* `CUAUV <http://cuauv.org/>`_: Cornell University's autonomous underwater
+  vehicle
 
 * `HarpyWar/pvpgn <https://github.com/pvpgn/pvpgn-server>`_:
   Player vs Player Gaming Network with tweaks
@@ -200,7 +208,11 @@ Projects using this library
 
 * `readpe <https://bitbucket.org/sys_dev/readpe>`_: Read Portable Executable
 
-* `redis-cerberus <https://github.com/HunanTV/redis-cerberus>`_: A Redis cluster proxy
+* `redis-cerberus <https://github.com/HunanTV/redis-cerberus>`_: A Redis cluster
+  proxy
+
+* `rpclib <http://rpclib.net/>`_: A modern C++ msgpack-RPC server and client
+  library
 
 * `Saddy <https://github.com/mamontov-cpp/saddy-graphics-engine-2d>`_:
   Small crossplatform 2D graphic engine
@@ -208,11 +220,11 @@ Projects using this library
 * `Salesforce Analytics Cloud <http://www.salesforce.com/analytics-cloud/overview/>`_:
   Business intelligence software
 
-* `Scylla <http://www.scylladb.com/>`_: A Cassandra-compatible NoSQL data store that can handle
-  1 million transactions per second on a single server
+* `Scylla <http://www.scylladb.com/>`_: A Cassandra-compatible NoSQL data store
+  that can handle 1 million transactions per second on a single server
 
-* `Seastar <http://www.seastar-project.org/>`_: An advanced, open-source C++ framework for
-  high-performance server applications on modern hardware
+* `Seastar <http://www.seastar-project.org/>`_: An advanced, open-source C++
+  framework for high-performance server applications on modern hardware
 
 * `spdlog <https://github.com/gabime/spdlog>`_: Super fast C++ logging library
 
@@ -220,7 +232,8 @@ Projects using this library
 
 * `Touch Surgery <https://www.touchsurgery.com/>`_: Surgery simulator
 
-* `TrinityCore <https://github.com/TrinityCore/TrinityCore>`_: Open-source MMORPG framework
+* `TrinityCore <https://github.com/TrinityCore/TrinityCore>`_: Open-source
+  MMORPG framework
 
 `More... <https://github.com/search?q=cppformat&type=Code>`_
 

externals/fmt/doc/api.rst

@@ -26,30 +26,29 @@ Core API
 and a lightweight subset of formatting functions.
 
 The following functions use :ref:`format string syntax <syntax>`
-imilar to that of Python's `str.format
+similar to that of Python's `str.format
 <http://docs.python.org/3/library/stdtypes.html#str.format>`_.
 They take *format_str* and *args* as arguments.
 
 *format_str* is a format string that contains literal text and replacement
 fields surrounded by braces ``{}``. The fields are replaced with formatted
-arguments in the resulting string.
+arguments in the resulting string. A function taking *format_str* doesn't
+participate in an overload resolution if the latter is not a string.
 
 *args* is an argument list representing objects to be formatted.
 
 .. _format:
 
-.. doxygenfunction:: format(const String&, const Args&...)
-.. doxygenfunction:: vformat(const String&, basic_format_args<typename buffer_context<Char>::type>)
+.. doxygenfunction:: format(const S&, const Args&...)
+.. doxygenfunction:: vformat(const S&, basic_format_args<typename buffer_context<Char>::type>)
 
 .. _print:
 
-.. doxygenfunction:: print(string_view, const Args&...)
+.. doxygenfunction:: print(const S&, const Args&...)
 .. doxygenfunction:: vprint(string_view, format_args)
 
-.. doxygenfunction:: print(std::FILE *, string_view, const Args&...)
+.. doxygenfunction:: print(std::FILE *, const S&, const Args&...)
 .. doxygenfunction:: vprint(std::FILE *, string_view, format_args)
-
-.. doxygenfunction:: print(std::FILE *, wstring_view, const Args&...)
 .. doxygenfunction:: vprint(std::FILE *, wstring_view, wformat_args)
 
 Named arguments
@@ -149,6 +148,35 @@ You can also reuse existing formatters, for example::
     }
   };
 
+You can also write a formatter for a hierarchy of classes::
+
+  #include <type_traits>
+  #include <fmt/format.h>
+
+  struct A {
+    virtual ~A() {}
+    virtual std::string name() const { return "A"; }
+  };
+
+  struct B : A {
+    virtual std::string name() const { return "B"; }
+  };
+
+  template <typename T>
+  struct fmt::formatter<T, std::enable_if_t<std::is_base_of<A, T>::value, char>> :
+      fmt::formatter<std::string> {
+    template <typename FormatCtx>
+    auto format(const A& a, FormatCtx& ctx) {
+      return fmt::formatter<std::string>::format(a.name(), ctx);
+    }
+  };
+
+  int main() {
+    B b;
+    A& a = b;
+    fmt::print("{}", a); // prints "B"
+  }
+
 This section shows how to define a custom format function for a user-defined
 type. The next section describes how to get ``fmt`` to use a conventional stream
 output ``operator<<`` when one is defined for a user-defined type.
@@ -156,7 +184,7 @@ output ``operator<<`` when one is defined for a user-defined type.
 Output iterator support
 -----------------------
 
-.. doxygenfunction:: fmt::format_to(OutputIt, string_view, const Args&...)
+.. doxygenfunction:: fmt::format_to(OutputIt, const S&, const Args&...)
 .. doxygenfunction:: fmt::format_to_n(OutputIt, std::size_t, string_view, const Args&...)
 .. doxygenstruct:: fmt::format_to_n_result
    :members:
@@ -173,12 +201,16 @@ The following user-defined literals are defined in ``fmt/format.h``.
 Utilities
 ---------
 
+.. doxygentypedef:: fmt::char_t
+
 .. doxygenfunction:: fmt::formatted_size(string_view, const Args&...)
 
 .. doxygenfunction:: fmt::to_string(const T&)
 
 .. doxygenfunction:: fmt::to_wstring(const T&)
 
+.. doxygenfunction:: fmt::to_string_view(basic_string_view<Char>)
+
 .. doxygenclass:: fmt::basic_memory_buffer
    :protected-members:
    :members:
@@ -248,7 +280,8 @@ custom argument formatter class::
   // with the ``x`` format specifier.
   class custom_arg_formatter : public arg_formatter {
    public:
-    custom_arg_formatter(fmt::format_context &ctx, fmt::format_specs &spec)
+    custom_arg_formatter(fmt::format_context &ctx,
+                         fmt::format_specs *spec = nullptr)
       : arg_formatter(ctx, spec) {}
 
     using arg_formatter::operator();
@@ -319,7 +352,7 @@ user-defined types that have overloaded ``operator<<``::
   std::string s = fmt::format("The date is {}", date(2012, 12, 9));
   // s == "The date is 2012-12-9"
 
-.. doxygenfunction:: print(std::ostream&, string_view, const Args&...)
+.. doxygenfunction:: print(std::basic_ostream<fmt::char_t<S>>&, const S&, const Args&...)
 
 .. _printf-api:
 
@@ -333,10 +366,10 @@ the POSIX extension for positional arguments. Unlike their standard
 counterparts, the ``fmt`` functions are type-safe and throw an exception if an
 argument type doesn't match its format specification.
 
-.. doxygenfunction:: printf(string_view, const Args&...)
+.. doxygenfunction:: printf(const S&, const Args&...)
 
-.. doxygenfunction:: fprintf(std::FILE *, string_view, const Args&...)
+.. doxygenfunction:: fprintf(std::FILE *, const S&, const Args&...)
 
-.. doxygenfunction:: fprintf(std::ostream&, string_view, const Args&...)
+.. doxygenfunction:: fprintf(std::basic_ostream<fmt::char_t<S>>&, const S&, const Args&...)
 
-.. doxygenfunction:: sprintf(string_view, const Args&...)
+.. doxygenfunction:: sprintf(const S&, const Args&...)

externals/fmt/doc/build.py

@@ -6,7 +6,7 @@ import errno, os, shutil, sys, tempfile
 from subprocess import check_call, check_output, CalledProcessError, Popen, PIPE
 from distutils.version import LooseVersion
 
-versions = ['1.0.0', '1.1.0', '2.0.0', '3.0.2', '4.0.0', '4.1.0', '5.0.0', '5.1.0', '5.2.0', '5.2.1']
+versions = ['1.0.0', '1.1.0', '2.0.0', '3.0.2', '4.0.0', '4.1.0', '5.0.0', '5.1.0', '5.2.0', '5.2.1', '5.3.0']
 
 def pip_install(package, commit=None, **kwargs):
   "Install package using pip."
@@ -89,10 +89,12 @@ def build_docs(version='dev', **kwargs):
                           FMT_USE_VARIADIC_TEMPLATES=1 \
                           FMT_USE_RVALUE_REFERENCES=1 \
                           FMT_USE_USER_DEFINED_LITERALS=1 \
+                          FMT_USE_ALIAS_TEMPLATES=1 \
                           FMT_API= \
                           "FMT_BEGIN_NAMESPACE=namespace fmt {{" \
                           "FMT_END_NAMESPACE=}}" \
-                          "FMT_STRING_ALIAS=1"
+                          "FMT_STRING_ALIAS=1" \
+                          "FMT_ENABLE_IF_T(B, T)=T"
       EXCLUDE_SYMBOLS   = fmt::internal::* StringValue write_str
     '''.format(include_dir, doxyxml_dir).encode('UTF-8'))
   if p.returncode != 0:

externals/fmt/doc/index.rst

@@ -40,7 +40,7 @@ The ``fmt::format`` function returns a string "The answer is 42.". You can use
   format_to(out, "For a moment, {} happened.", "nothing");
   out.data(); // returns a pointer to the formatted data
 
-The ``fmt::print`` function performs formatting and writes the result to a file:
+The ``fmt::print`` function performs formatting and writes the result to a stream:
 
 .. code:: c++
 
@@ -94,7 +94,7 @@ Safety
 
 The library is fully type safe, automatic memory management prevents buffer
 overflow, errors in format strings are reported using exceptions or at compile
-tim. For example, the code
+time. For example, the code
 
 .. code:: c++
 

externals/fmt/doc/usage.rst

@@ -45,7 +45,7 @@ You can control generation of the make ``test`` target with the ``FMT_TEST``
 CMake option. This can be useful if you include fmt as a subdirectory in
 your project but don't want to add fmt's tests to your ``test`` target.
 
-If you use Windows and have Visual Studio installed, a :file:`FORMAT.sln`
+If you use Windows and have Visual Studio installed, a :file:`FMT.sln`
 file and several :file:`.vcproj` files will be created. You can then build them
 using Visual Studio or msbuild.
 
@@ -74,7 +74,12 @@ or
 
 to exclude it from ``make``, ``make all``, or ``cmake --build .``.
 
-Settting up your target to use a header-only version of ``fmt`` is equaly easy::
+You can detect and use an installed version of {fmt} as follows::
+
+   find_package(fmt)
+   target_link_libraries(<your-target> fmt::fmt)
+
+Setting up your target to use a header-only version of ``fmt`` is equaly easy::
 
    target_link_libraries(<your-target> PRIVATE fmt-header-only)
 

externals/fmt/include/fmt/chrono.h

@@ -0,0 +1,452 @@
+// Formatting library for C++ - chrono support
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_CHRONO_H_
+#define FMT_CHRONO_H_
+
+#include "format.h"
+#include "locale.h"
+
+#include <chrono>
+#include <ctime>
+#include <locale>
+#include <sstream>
+
+FMT_BEGIN_NAMESPACE
+
+namespace internal{
+
+enum class numeric_system {
+  standard,
+  // Alternative numeric system, e.g. 十二 instead of 12 in ja_JP locale.
+  alternative
+};
+
+// Parses a put_time-like format string and invokes handler actions.
+template <typename Char, typename Handler>
+FMT_CONSTEXPR const Char *parse_chrono_format(
+    const Char *begin, const Char *end, Handler &&handler) {
+  auto ptr = begin;
+  while (ptr != end) {
+    auto c = *ptr;
+    if (c == '}') break;
+    if (c != '%') {
+      ++ptr;
+      continue;
+    }
+    if (begin != ptr)
+      handler.on_text(begin, ptr);
+    ++ptr; // consume '%'
+    if (ptr == end)
+      throw format_error("invalid format");
+    c = *ptr++;
+    switch (c) {
+    case '%':
+      handler.on_text(ptr - 1, ptr);
+      break;
+    case 'n': {
+      const char newline[] = "\n";
+      handler.on_text(newline, newline + 1);
+      break;
+    }
+    case 't': {
+      const char tab[] = "\t";
+      handler.on_text(tab, tab + 1);
+      break;
+    }
+    // Day of the week:
+    case 'a':
+      handler.on_abbr_weekday();
+      break;
+    case 'A':
+      handler.on_full_weekday();
+      break;
+    case 'w':
+      handler.on_dec0_weekday(numeric_system::standard);
+      break;
+    case 'u':
+      handler.on_dec1_weekday(numeric_system::standard);
+      break;
+    // Month:
+    case 'b':
+      handler.on_abbr_month();
+      break;
+    case 'B':
+      handler.on_full_month();
+      break;
+    // Hour, minute, second:
+    case 'H':
+      handler.on_24_hour(numeric_system::standard);
+      break;
+    case 'I':
+      handler.on_12_hour(numeric_system::standard);
+      break;
+    case 'M':
+      handler.on_minute(numeric_system::standard);
+      break;
+    case 'S':
+      handler.on_second(numeric_system::standard);
+      break;
+    // Other:
+    case 'c':
+      handler.on_datetime(numeric_system::standard);
+      break;
+    case 'x':
+      handler.on_loc_date(numeric_system::standard);
+      break;
+    case 'X':
+      handler.on_loc_time(numeric_system::standard);
+      break;
+    case 'D':
+      handler.on_us_date();
+      break;
+    case 'F':
+      handler.on_iso_date();
+      break;
+    case 'r':
+      handler.on_12_hour_time();
+      break;
+    case 'R':
+      handler.on_24_hour_time();
+      break;
+    case 'T':
+      handler.on_iso_time();
+      break;
+    case 'p':
+      handler.on_am_pm();
+      break;
+    case 'z':
+      handler.on_utc_offset();
+      break;
+    case 'Z':
+      handler.on_tz_name();
+      break;
+    // Alternative representation:
+    case 'E': {
+      if (ptr == end)
+        throw format_error("invalid format");
+      c = *ptr++;
+      switch (c) {
+      case 'c':
+        handler.on_datetime(numeric_system::alternative);
+        break;
+      case 'x':
+        handler.on_loc_date(numeric_system::alternative);
+        break;
+      case 'X':
+        handler.on_loc_time(numeric_system::alternative);
+        break;
+      default:
+        throw format_error("invalid format");
+      }
+      break;
+    }
+    case 'O':
+      if (ptr == end)
+        throw format_error("invalid format");
+      c = *ptr++;
+      switch (c) {
+      case 'w':
+        handler.on_dec0_weekday(numeric_system::alternative);
+        break;
+      case 'u':
+        handler.on_dec1_weekday(numeric_system::alternative);
+        break;
+      case 'H':
+        handler.on_24_hour(numeric_system::alternative);
+        break;
+      case 'I':
+        handler.on_12_hour(numeric_system::alternative);
+        break;
+      case 'M':
+        handler.on_minute(numeric_system::alternative);
+        break;
+      case 'S':
+        handler.on_second(numeric_system::alternative);
+        break;
+      default:
+        throw format_error("invalid format");
+      }
+      break;
+    default:
+      throw format_error("invalid format");
+    }
+    begin = ptr;
+  }
+  if (begin != ptr)
+    handler.on_text(begin, ptr);
+  return ptr;
+}
+
+struct chrono_format_checker {
+  void report_no_date() { throw format_error("no date"); }
+
+  template <typename Char>
+  void on_text(const Char *, const Char *) {}
+  void on_abbr_weekday() { report_no_date(); }
+  void on_full_weekday() { report_no_date(); }
+  void on_dec0_weekday(numeric_system) { report_no_date(); }
+  void on_dec1_weekday(numeric_system) { report_no_date(); }
+  void on_abbr_month() { report_no_date(); }
+  void on_full_month() { report_no_date(); }
+  void on_24_hour(numeric_system) {}
+  void on_12_hour(numeric_system) {}
+  void on_minute(numeric_system) {}
+  void on_second(numeric_system) {}
+  void on_datetime(numeric_system) { report_no_date(); }
+  void on_loc_date(numeric_system) { report_no_date(); }
+  void on_loc_time(numeric_system) { report_no_date(); }
+  void on_us_date() { report_no_date(); }
+  void on_iso_date() { report_no_date(); }
+  void on_12_hour_time() {}
+  void on_24_hour_time() {}
+  void on_iso_time() {}
+  void on_am_pm() {}
+  void on_utc_offset() { report_no_date(); }
+  void on_tz_name() { report_no_date(); }
+};
+
+template <typename Int>
+inline int to_int(Int value) {
+  FMT_ASSERT(value >= (std::numeric_limits<int>::min)() &&
+             value <= (std::numeric_limits<int>::max)(), "invalid value");
+  return static_cast<int>(value);
+}
+
+template <typename FormatContext, typename OutputIt>
+struct chrono_formatter {
+  FormatContext &context;
+  OutputIt out;
+  std::chrono::seconds s;
+  std::chrono::milliseconds ms;
+
+  typedef typename FormatContext::char_type char_type;
+
+  explicit chrono_formatter(FormatContext &ctx, OutputIt o)
+    : context(ctx), out(o) {}
+
+  int hour() const { return to_int((s.count() / 3600) % 24); }
+
+  int hour12() const {
+    auto hour = to_int((s.count() / 3600) % 12);
+    return hour > 0 ? hour : 12;
+  }
+
+  int minute() const { return to_int((s.count() / 60) % 60); }
+  int second() const { return to_int(s.count() % 60); }
+
+  std::tm time() const {
+    auto time = std::tm();
+    time.tm_hour = hour();
+    time.tm_min = minute();
+    time.tm_sec = second();
+    return time;
+  }
+
+  void write(int value, int width) {
+    typedef typename int_traits<int>::main_type main_type;
+    main_type n = to_unsigned(value);
+    int num_digits = internal::count_digits(n);
+    if (width > num_digits)
+      out = std::fill_n(out, width - num_digits, '0');
+    out = format_decimal<char_type>(out, n, num_digits);
+  }
+
+  void format_localized(const tm &time, const char *format) {
+    auto locale = context.locale().template get<std::locale>();
+    auto &facet = std::use_facet<std::time_put<char_type>>(locale);
+    std::basic_ostringstream<char_type> os;
+    os.imbue(locale);
+    facet.put(os, os, ' ', &time, format, format + std::strlen(format));
+    auto str = os.str();
+    std::copy(str.begin(), str.end(), out);
+  }
+
+  void on_text(const char_type *begin, const char_type *end) {
+    std::copy(begin, end, out);
+  }
+
+  // These are not implemented because durations don't have date information.
+  void on_abbr_weekday() {}
+  void on_full_weekday() {}
+  void on_dec0_weekday(numeric_system) {}
+  void on_dec1_weekday(numeric_system) {}
+  void on_abbr_month() {}
+  void on_full_month() {}
+  void on_datetime(numeric_system) {}
+  void on_loc_date(numeric_system) {}
+  void on_loc_time(numeric_system) {}
+  void on_us_date() {}
+  void on_iso_date() {}
+  void on_utc_offset() {}
+  void on_tz_name() {}
+
+  void on_24_hour(numeric_system ns) {
+    if (ns == numeric_system::standard)
+      return write(hour(), 2);
+    auto time = tm();
+    time.tm_hour = hour();
+    format_localized(time, "%OH");
+  }
+
+  void on_12_hour(numeric_system ns) {
+    if (ns == numeric_system::standard)
+      return write(hour12(), 2);
+    auto time = tm();
+    time.tm_hour = hour();
+    format_localized(time, "%OI");
+  }
+
+  void on_minute(numeric_system ns) {
+    if (ns == numeric_system::standard)
+      return write(minute(), 2);
+    auto time = tm();
+    time.tm_min = minute();
+    format_localized(time, "%OM");
+  }
+
+  void on_second(numeric_system ns) {
+    if (ns == numeric_system::standard) {
+      write(second(), 2);
+      if (ms != std::chrono::milliseconds(0)) {
+        *out++ = '.';
+        write(to_int(ms.count()), 3);
+      }
+      return;
+    }
+    auto time = tm();
+    time.tm_sec = second();
+    format_localized(time, "%OS");
+  }
+
+  void on_12_hour_time() { format_localized(time(), "%r"); }
+
+  void on_24_hour_time() {
+    write(hour(), 2);
+    *out++ = ':';
+    write(minute(), 2);
+  }
+
+  void on_iso_time() {
+    on_24_hour_time();
+    *out++ = ':';
+    write(second(), 2);
+  }
+
+  void on_am_pm() { format_localized(time(), "%p"); }
+};
+}  // namespace internal
+
+template <typename Period> FMT_CONSTEXPR const char *get_units() {
+  return FMT_NULL;
+}
+template <> FMT_CONSTEXPR const char *get_units<std::atto>() { return "as"; }
+template <> FMT_CONSTEXPR const char *get_units<std::femto>() { return "fs"; }
+template <> FMT_CONSTEXPR const char *get_units<std::pico>() { return "ps"; }
+template <> FMT_CONSTEXPR const char *get_units<std::nano>() { return "ns"; }
+template <> FMT_CONSTEXPR const char *get_units<std::micro>() { return "µs"; }
+template <> FMT_CONSTEXPR const char *get_units<std::milli>() { return "ms"; }
+template <> FMT_CONSTEXPR const char *get_units<std::centi>() { return "cs"; }
+template <> FMT_CONSTEXPR const char *get_units<std::deci>() { return "ds"; }
+template <> FMT_CONSTEXPR const char *get_units<std::ratio<1>>() { return "s"; }
+template <> FMT_CONSTEXPR const char *get_units<std::deca>() { return "das"; }
+template <> FMT_CONSTEXPR const char *get_units<std::hecto>() { return "hs"; }
+template <> FMT_CONSTEXPR const char *get_units<std::kilo>() { return "ks"; }
+template <> FMT_CONSTEXPR const char *get_units<std::mega>() { return "Ms"; }
+template <> FMT_CONSTEXPR const char *get_units<std::giga>() { return "Gs"; }
+template <> FMT_CONSTEXPR const char *get_units<std::tera>() { return "Ts"; }
+template <> FMT_CONSTEXPR const char *get_units<std::peta>() { return "Ps"; }
+template <> FMT_CONSTEXPR const char *get_units<std::exa>() { return "Es"; }
+template <> FMT_CONSTEXPR const char *get_units<std::ratio<60>>() {
+  return "m";
+}
+template <> FMT_CONSTEXPR const char *get_units<std::ratio<3600>>() {
+  return "h";
+}
+
+template <typename Rep, typename Period, typename Char>
+struct formatter<std::chrono::duration<Rep, Period>, Char> {
+ private:
+  align_spec spec;
+  internal::arg_ref<Char> width_ref;
+  mutable basic_string_view<Char> format_str;
+  typedef std::chrono::duration<Rep, Period> duration;
+
+  struct spec_handler {
+    formatter &f;
+    basic_parse_context<Char> &context;
+
+    typedef internal::arg_ref<Char> arg_ref_type;
+
+    template <typename Id>
+    FMT_CONSTEXPR arg_ref_type make_arg_ref(Id arg_id) {
+      context.check_arg_id(arg_id);
+      return arg_ref_type(arg_id);
+    }
+
+    FMT_CONSTEXPR arg_ref_type make_arg_ref(internal::auto_id) {
+      return arg_ref_type(context.next_arg_id());
+    }
+
+    void on_error(const char *msg) { throw format_error(msg); }
+    void on_fill(Char fill) { f.spec.fill_ = fill; }
+    void on_align(alignment align) { f.spec.align_ = align; }
+    void on_width(unsigned width) { f.spec.width_ = width; }
+
+    template <typename Id>
+    void on_dynamic_width(Id arg_id) {
+      f.width_ref = make_arg_ref(arg_id);
+    }
+  };
+
+ public:
+  formatter() : spec() {}
+
+  FMT_CONSTEXPR auto parse(basic_parse_context<Char> &ctx)
+      -> decltype(ctx.begin()) {
+    auto begin = ctx.begin(), end = ctx.end();
+    if (begin == end) return begin;
+    spec_handler handler{*this, ctx};
+    begin = internal::parse_align(begin, end, handler);
+    if (begin == end) return begin;
+    begin = internal::parse_width(begin, end, handler);
+    end = parse_chrono_format(begin, end, internal::chrono_format_checker());
+    format_str = basic_string_view<Char>(&*begin, internal::to_unsigned(end - begin));
+    return end;
+  }
+
+  template <typename FormatContext>
+  auto format(const duration &d, FormatContext &ctx)
+      -> decltype(ctx.out()) {
+    auto begin = format_str.begin(), end = format_str.end();
+    memory_buffer buf;
+    typedef output_range<decltype(ctx.out()), Char> range;
+    basic_writer<range> w(range(ctx.out()));
+    if (begin == end || *begin == '}') {
+      if (const char *unit = get_units<Period>())
+        format_to(buf, "{}{}", d.count(), unit);
+      else if (Period::den == 1)
+        format_to(buf, "{}[{}]s", d.count(), Period::num);
+      else
+        format_to(buf, "{}[{}/{}]s", d.count(), Period::num, Period::den);
+      internal::handle_dynamic_spec<internal::width_checker>(
+        spec.width_, width_ref, ctx);
+    } else {
+      auto out = std::back_inserter(buf);
+      internal::chrono_formatter<FormatContext, decltype(out)> f(ctx, out);
+      f.s = std::chrono::duration_cast<std::chrono::seconds>(d);
+      f.ms = std::chrono::duration_cast<std::chrono::milliseconds>(d - f.s);
+      parse_chrono_format(begin, end, f);
+    }
+    w.write(buf.data(), buf.size(), spec);
+    return w.out();
+  }
+};
+
+FMT_END_NAMESPACE
+
+#endif  // FMT_CHRONO_H_

externals/fmt/include/fmt/color.h

@@ -47,7 +47,6 @@ inline void vprint_colored(color c, wstring_view format, wformat_args args) {
 
 #else
 
-// Experimental color support.
 enum class color : uint32_t {
   alice_blue              = 0xF0F8FF, // rgb(240,248,255)
   antique_white           = 0xFAEBD7, // rgb(250,235,215)
@@ -189,9 +188,35 @@ enum class color : uint32_t {
   white                   = 0xFFFFFF, // rgb(255,255,255)
   white_smoke             = 0xF5F5F5, // rgb(245,245,245)
   yellow                  = 0xFFFF00, // rgb(255,255,0)
-  yellow_green            = 0x9ACD32, // rgb(154,205,50)
+  yellow_green            = 0x9ACD32  // rgb(154,205,50)
 };  // enum class color
 
+enum class terminal_color : uint8_t {
+  black = 30,
+  red,
+  green,
+  yellow,
+  blue,
+  magenta,
+  cyan,
+  white,
+  bright_black = 90,
+  bright_red,
+  bright_green,
+  bright_yellow,
+  bright_blue,
+  bright_magenta,
+  bright_cyan,
+  bright_white
+};  // enum class terminal_color
+
+enum class emphasis : uint8_t {
+  bold = 1,
+  italic = 1 << 1,
+  underline = 1 << 2,
+  strikethrough = 1 << 3
+};  // enum class emphasis
+
 // rgb is a struct for red, green and blue colors.
 // We use rgb as name because some editors will show it as color direct in the
 // editor.
@@ -209,66 +234,340 @@ struct rgb {
   uint8_t b;
 };
 
-void vprint_rgb(rgb fd, string_view format, format_args args);
-void vprint_rgb(rgb fd, rgb bg, string_view format, format_args args);
-
-/**
-  Formats a string and prints it to stdout using ANSI escape sequences to
-  specify foreground color 'fd'.
-  Example:
-    fmt::print(fmt::color::red, "Elapsed time: {0:.2f} seconds", 1.23);
- */
-template <typename... Args>
-inline void print(rgb fd, string_view format_str, const Args & ... args) {
-  vprint_rgb(fd, format_str, make_format_args(args...));
-}
-
-/**
-  Formats a string and prints it to stdout using ANSI escape sequences to
-  specify foreground color 'fd' and background color 'bg'.
-  Example:
-    fmt::print(fmt::color::red, fmt::color::black,
-               "Elapsed time: {0:.2f} seconds", 1.23);
- */
-template <typename... Args>
-inline void print(rgb fd, rgb bg, string_view format_str,
-                  const Args & ... args) {
-  vprint_rgb(fd, bg, format_str, make_format_args(args...));
-}
 namespace internal {
-FMT_CONSTEXPR void to_esc(uint8_t c, char out[], int offset) {
-  out[offset + 0] = static_cast<char>('0' + c / 100);
-  out[offset + 1] = static_cast<char>('0' + c / 10 % 10);
-  out[offset + 2] = static_cast<char>('0' + c % 10);
-}
+
+// color is a struct of either a rgb color or a terminal color.
+struct color_type {
+  FMT_CONSTEXPR color_type() FMT_NOEXCEPT
+    : is_rgb(), value{} {}
+  FMT_CONSTEXPR color_type(color rgb_color) FMT_NOEXCEPT
+    : is_rgb(true), value{} {
+    value.rgb_color = static_cast<uint32_t>(rgb_color);
+  }
+  FMT_CONSTEXPR color_type(rgb rgb_color) FMT_NOEXCEPT
+    : is_rgb(true), value{} {
+    value.rgb_color = (static_cast<uint32_t>(rgb_color.r) << 16)
+       | (static_cast<uint32_t>(rgb_color.g) << 8) | rgb_color.b;
+  }
+  FMT_CONSTEXPR color_type(terminal_color term_color) FMT_NOEXCEPT
+    : is_rgb(), value{} {
+    value.term_color = static_cast<uint8_t>(term_color);
+  }
+  bool is_rgb;
+  union color_union {
+    uint8_t term_color;
+    uint32_t rgb_color;
+  } value;
+};
 } // namespace internal
 
-inline void vprint_rgb(rgb fd, string_view format, format_args args) {
-  char escape_fd[] = "\x1b[38;2;000;000;000m";
-  internal::to_esc(fd.r, escape_fd, 7);
-  internal::to_esc(fd.g, escape_fd, 11);
-  internal::to_esc(fd.b, escape_fd, 15);
+// Experimental text formatting support.
+class text_style {
+ public:
+  FMT_CONSTEXPR text_style(emphasis em = emphasis()) FMT_NOEXCEPT
+      : set_foreground_color(), set_background_color(), ems(em) {}
 
-  std::fputs(escape_fd, stdout);
-  vprint(format, args);
-  std::fputs(internal::data::RESET_COLOR, stdout);
+  FMT_CONSTEXPR text_style &operator|=(const text_style &rhs) {
+    if (!set_foreground_color) {
+      set_foreground_color = rhs.set_foreground_color;
+      foreground_color = rhs.foreground_color;
+    } else if (rhs.set_foreground_color) {
+      if (!foreground_color.is_rgb || !rhs.foreground_color.is_rgb)
+        throw format_error("can't OR a terminal color");
+      foreground_color.value.rgb_color |= rhs.foreground_color.value.rgb_color;
+    }
+
+    if (!set_background_color) {
+      set_background_color = rhs.set_background_color;
+      background_color = rhs.background_color;
+    } else if (rhs.set_background_color) {
+      if (!background_color.is_rgb || !rhs.background_color.is_rgb)
+        throw format_error("can't OR a terminal color");
+      background_color.value.rgb_color |= rhs.background_color.value.rgb_color;
+    }
+
+    ems = static_cast<emphasis>(static_cast<uint8_t>(ems) |
+                                static_cast<uint8_t>(rhs.ems));
+    return *this;
+  }
+
+  friend FMT_CONSTEXPR
+  text_style operator|(text_style lhs, const text_style &rhs) {
+    return lhs |= rhs;
+  }
+
+  FMT_CONSTEXPR text_style &operator&=(const text_style &rhs) {
+    if (!set_foreground_color) {
+      set_foreground_color = rhs.set_foreground_color;
+      foreground_color = rhs.foreground_color;
+    } else if (rhs.set_foreground_color) {
+      if (!foreground_color.is_rgb || !rhs.foreground_color.is_rgb)
+        throw format_error("can't AND a terminal color");
+      foreground_color.value.rgb_color &= rhs.foreground_color.value.rgb_color;
+    }
+
+    if (!set_background_color) {
+      set_background_color = rhs.set_background_color;
+      background_color = rhs.background_color;
+    } else if (rhs.set_background_color) {
+      if (!background_color.is_rgb || !rhs.background_color.is_rgb)
+        throw format_error("can't AND a terminal color");
+      background_color.value.rgb_color &= rhs.background_color.value.rgb_color;
+    }
+
+    ems = static_cast<emphasis>(static_cast<uint8_t>(ems) &
+                                static_cast<uint8_t>(rhs.ems));
+    return *this;
+  }
+
+  friend FMT_CONSTEXPR
+  text_style operator&(text_style lhs, const text_style &rhs) {
+    return lhs &= rhs;
+  }
+
+  FMT_CONSTEXPR bool has_foreground() const FMT_NOEXCEPT {
+    return set_foreground_color;
+  }
+  FMT_CONSTEXPR bool has_background() const FMT_NOEXCEPT {
+    return set_background_color;
+  }
+  FMT_CONSTEXPR bool has_emphasis() const FMT_NOEXCEPT {
+    return static_cast<uint8_t>(ems) != 0;
+  }
+  FMT_CONSTEXPR internal::color_type get_foreground() const FMT_NOEXCEPT {
+    assert(has_foreground() && "no foreground specified for this style");
+    return foreground_color;
+  }
+  FMT_CONSTEXPR internal::color_type get_background() const FMT_NOEXCEPT {
+    assert(has_background() && "no background specified for this style");
+    return background_color;
+  }
+  FMT_CONSTEXPR emphasis get_emphasis() const FMT_NOEXCEPT {
+    assert(has_emphasis() && "no emphasis specified for this style");
+    return ems;
+  }
+
+private:
+ FMT_CONSTEXPR text_style(bool is_foreground,
+                          internal::color_type text_color) FMT_NOEXCEPT
+     : set_foreground_color(),
+       set_background_color(),
+       ems() {
+   if (is_foreground) {
+     foreground_color = text_color;
+     set_foreground_color = true;
+   } else {
+     background_color = text_color;
+     set_background_color = true;
+   }
+ }
+
+  friend FMT_CONSTEXPR_DECL text_style fg(internal::color_type foreground)
+      FMT_NOEXCEPT;
+  friend FMT_CONSTEXPR_DECL text_style bg(internal::color_type background)
+      FMT_NOEXCEPT;
+
+  internal::color_type foreground_color;
+  internal::color_type background_color;
+  bool set_foreground_color;
+  bool set_background_color;
+  emphasis ems;
+};
+
+FMT_CONSTEXPR text_style fg(internal::color_type foreground) FMT_NOEXCEPT {
+  return text_style(/*is_foreground=*/true, foreground);
 }
 
-inline void vprint_rgb(rgb fd, rgb bg, string_view format, format_args args) {
-  char escape_fd[] = "\x1b[38;2;000;000;000m"; // foreground color
-  char escape_bg[] = "\x1b[48;2;000;000;000m"; // background color
-  internal::to_esc(fd.r, escape_fd, 7);
-  internal::to_esc(fd.g, escape_fd, 11);
-  internal::to_esc(fd.b, escape_fd, 15);
+FMT_CONSTEXPR text_style bg(internal::color_type background) FMT_NOEXCEPT {
+  return text_style(/*is_foreground=*/false, background);
+}
 
-  internal::to_esc(bg.r, escape_bg, 7);
-  internal::to_esc(bg.g, escape_bg, 11);
-  internal::to_esc(bg.b, escape_bg, 15);
+FMT_CONSTEXPR text_style operator|(emphasis lhs, emphasis rhs) FMT_NOEXCEPT {
+  return text_style(lhs) | rhs;
+}
 
-  std::fputs(escape_fd, stdout);
-  std::fputs(escape_bg, stdout);
-  vprint(format, args);
-  std::fputs(internal::data::RESET_COLOR, stdout);
+namespace internal {
+
+template <typename Char>
+struct ansi_color_escape {
+  FMT_CONSTEXPR ansi_color_escape(internal::color_type text_color,
+                                  const char * esc) FMT_NOEXCEPT {
+    // If we have a terminal color, we need to output another escape code
+    // sequence.
+    if (!text_color.is_rgb) {
+      bool is_background = esc == internal::data::BACKGROUND_COLOR;
+      uint32_t value = text_color.value.term_color;
+      // Background ASCII codes are the same as the foreground ones but with
+      // 10 more.
+      if (is_background)
+        value += 10u;
+
+      std::size_t index = 0;
+      buffer[index++] = static_cast<Char>('\x1b');
+      buffer[index++] = static_cast<Char>('[');
+
+      if (value >= 100u) {
+        buffer[index++] = static_cast<Char>('1');
+        value %= 100u;
+      }
+      buffer[index++] = static_cast<Char>('0' + value / 10u);
+      buffer[index++] = static_cast<Char>('0' + value % 10u);
+
+      buffer[index++] = static_cast<Char>('m');
+      buffer[index++] = static_cast<Char>('\0');
+      return;
+    }
+
+    for (int i = 0; i < 7; i++) {
+      buffer[i] = static_cast<Char>(esc[i]);
+    }
+    rgb color(text_color.value.rgb_color);
+    to_esc(color.r, buffer +  7, ';');
+    to_esc(color.g, buffer + 11, ';');
+    to_esc(color.b, buffer + 15, 'm');
+    buffer[19] = static_cast<Char>(0);
+  }
+  FMT_CONSTEXPR ansi_color_escape(emphasis em) FMT_NOEXCEPT {
+    uint8_t em_codes[4] = {};
+    uint8_t em_bits = static_cast<uint8_t>(em);
+    if (em_bits & static_cast<uint8_t>(emphasis::bold))
+      em_codes[0] = 1;
+    if (em_bits & static_cast<uint8_t>(emphasis::italic))
+      em_codes[1] = 3;
+    if (em_bits & static_cast<uint8_t>(emphasis::underline))
+      em_codes[2] = 4;
+    if (em_bits & static_cast<uint8_t>(emphasis::strikethrough))
+      em_codes[3] = 9;
+
+    std::size_t index = 0;
+    for (int i = 0; i < 4; ++i) {
+      if (!em_codes[i])
+        continue;
+      buffer[index++] = static_cast<Char>('\x1b');
+      buffer[index++] = static_cast<Char>('[');
+      buffer[index++] = static_cast<Char>('0' + em_codes[i]);
+      buffer[index++] = static_cast<Char>('m');
+    }
+    buffer[index++] = static_cast<Char>(0);
+  }
+  FMT_CONSTEXPR operator const Char *() const FMT_NOEXCEPT { return buffer; }
+
+private:
+  Char buffer[7u + 3u * 4u + 1u];
+
+  static FMT_CONSTEXPR void to_esc(uint8_t c, Char *out,
+                                   char delimiter) FMT_NOEXCEPT {
+    out[0] = static_cast<Char>('0' + c / 100);
+    out[1] = static_cast<Char>('0' + c / 10 % 10);
+    out[2] = static_cast<Char>('0' + c % 10);
+    out[3] = static_cast<Char>(delimiter);
+  }
+};
+
+template <typename Char>
+FMT_CONSTEXPR ansi_color_escape<Char>
+make_foreground_color(internal::color_type foreground) FMT_NOEXCEPT {
+  return ansi_color_escape<Char>(foreground, internal::data::FOREGROUND_COLOR);
+}
+
+template <typename Char>
+FMT_CONSTEXPR ansi_color_escape<Char>
+make_background_color(internal::color_type background) FMT_NOEXCEPT {
+  return ansi_color_escape<Char>(background, internal::data::BACKGROUND_COLOR);
+}
+
+template <typename Char>
+FMT_CONSTEXPR ansi_color_escape<Char>
+make_emphasis(emphasis em) FMT_NOEXCEPT {
+  return ansi_color_escape<Char>(em);
+}
+
+template <typename Char>
+inline void fputs(const Char *chars, FILE *stream) FMT_NOEXCEPT {
+  std::fputs(chars, stream);
+}
+
+template <>
+inline void fputs<wchar_t>(const wchar_t *chars, FILE *stream) FMT_NOEXCEPT {
+  std::fputws(chars, stream);
+}
+
+template <typename Char>
+inline void reset_color(FILE *stream) FMT_NOEXCEPT {
+  fputs(internal::data::RESET_COLOR, stream);
+}
+
+template <>
+inline void reset_color<wchar_t>(FILE *stream) FMT_NOEXCEPT {
+  fputs(internal::data::WRESET_COLOR, stream);
+}
+
+// The following specialiazation disables using std::FILE as a character type,
+// which is needed because or else
+//   fmt::print(stderr, fmt::emphasis::bold, "");
+// would take stderr (a std::FILE *) as the format string.
+template <>
+struct is_string<std::FILE *> : std::false_type {};
+template <>
+struct is_string<const std::FILE *> : std::false_type {};
+} // namespace internal
+
+template <
+  typename S, typename Char = typename internal::char_t<S>::type>
+void vprint(std::FILE *f, const text_style &ts, const S &format,
+            basic_format_args<typename buffer_context<Char>::type> args) {
+  bool has_style = false;
+  if (ts.has_emphasis()) {
+    has_style = true;
+    internal::fputs<Char>(
+          internal::make_emphasis<Char>(ts.get_emphasis()), f);
+  }
+  if (ts.has_foreground()) {
+    has_style = true;
+    internal::fputs<Char>(
+          internal::make_foreground_color<Char>(ts.get_foreground()), f);
+  }
+  if (ts.has_background()) {
+    has_style = true;
+    internal::fputs<Char>(
+        internal::make_background_color<Char>(ts.get_background()), f);
+  }
+  vprint(f, format, args);
+  if (has_style) {
+    internal::reset_color<Char>(f);
+  }
+}
+
+/**
+  Formats a string and prints it to the specified file stream using ANSI
+  escape sequences to specify text formatting.
+  Example:
+    fmt::print(fmt::emphasis::bold | fg(fmt::color::red),
+               "Elapsed time: {0:.2f} seconds", 1.23);
+ */
+template <typename String, typename... Args>
+typename std::enable_if<internal::is_string<String>::value>::type print(
+    std::FILE *f, const text_style &ts, const String &format_str,
+    const Args &... args) {
+  internal::check_format_string<Args...>(format_str);
+  typedef typename internal::char_t<String>::type char_t;
+  typedef typename buffer_context<char_t>::type context_t;
+  format_arg_store<context_t, Args...> as{args...};
+  vprint(f, ts, format_str, basic_format_args<context_t>(as));
+}
+
+/**
+  Formats a string and prints it to stdout using ANSI escape sequences to
+  specify text formatting.
+  Example:
+    fmt::print(fmt::emphasis::bold | fg(fmt::color::red),
+               "Elapsed time: {0:.2f} seconds", 1.23);
+ */
+template <typename String, typename... Args>
+typename std::enable_if<internal::is_string<String>::value>::type print(
+    const text_style &ts, const String &format_str,
+    const Args &... args) {
+  return print(stdout, ts, format_str, args...);
 }
 
 #endif

externals/fmt/include/fmt/format-inl.h

@@ -136,12 +136,14 @@ int safe_strerror(
             ERANGE : result;
     }
 
+#if !FMT_MSC_VER
     // Fallback to strerror if strerror_r and strerror_s are not available.
     int fallback(internal::null<>) {
       errno = 0;
       buffer_ = strerror(error_code_);
       return errno;
     }
+#endif
 
    public:
     dispatcher(int err_code, char *&buf, std::size_t buf_size)
@@ -170,7 +172,7 @@ void format_error_code(internal::buffer &out, int error_code,
     abs_value = 0 - abs_value;
     ++error_code_size;
   }
-  error_code_size += internal::count_digits(abs_value);
+  error_code_size += internal::to_unsigned(internal::count_digits(abs_value));
   writer w(out);
   if (message.size() <= inline_buffer_size - error_code_size) {
     w.write(message);
@@ -192,34 +194,39 @@ void report_error(FormatFunc func, int error_code,
 }
 }  // namespace
 
-#if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
-class locale {
- private:
-  std::locale locale_;
-
- public:
-  explicit locale(std::locale loc = std::locale()) : locale_(loc) {}
-  std::locale get() { return locale_; }
-};
-
-FMT_FUNC size_t internal::count_code_points(u8string_view s) {
+FMT_FUNC size_t internal::count_code_points(basic_string_view<char8_t> s) {
   const char8_t *data = s.data();
-  int num_code_points = 0;
+  size_t num_code_points = 0;
   for (size_t i = 0, size = s.size(); i != size; ++i) {
-    if ((data[i].value & 0xc0) != 0x80)
+    if ((data[i] & 0xc0) != 0x80)
       ++num_code_points;
   }
   return num_code_points;
 }
 
+#if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
+namespace internal {
+
+template <typename Locale>
+locale_ref::locale_ref(const Locale &loc) : locale_(&loc) {
+  static_assert(std::is_same<Locale, std::locale>::value, "");
+}
+
+template <typename Locale>
+Locale locale_ref::get() const {
+  static_assert(std::is_same<Locale, std::locale>::value, "");
+  return locale_ ? *static_cast<const std::locale*>(locale_) : std::locale();
+}
+
 template <typename Char>
-FMT_FUNC Char internal::thousands_sep(locale_provider *lp) {
-  std::locale loc = lp ? lp->locale().get() : std::locale();
-  return std::use_facet<std::numpunct<Char>>(loc).thousands_sep();
+FMT_FUNC Char thousands_sep_impl(locale_ref loc) {
+  return std::use_facet<std::numpunct<Char> >(
+    loc.get<std::locale>()).thousands_sep();
+}
 }
 #else
 template <typename Char>
-FMT_FUNC Char internal::thousands_sep(locale_provider *lp) {
+FMT_FUNC Char internal::thousands_sep_impl(locale_ref) {
   return FMT_STATIC_THOUSANDS_SEPARATOR;
 }
 #endif
@@ -236,19 +243,19 @@ FMT_FUNC void system_error::init(
 namespace internal {
 template <typename T>
 int char_traits<char>::format_float(
-    char *buffer, std::size_t size, const char *format, int precision, T value) {
+    char *buf, std::size_t size, const char *format, int precision, T value) {
   return precision < 0 ?
-      FMT_SNPRINTF(buffer, size, format, value) :
-      FMT_SNPRINTF(buffer, size, format, precision, value);
+      FMT_SNPRINTF(buf, size, format, value) :
+      FMT_SNPRINTF(buf, size, format, precision, value);
 }
 
 template <typename T>
 int char_traits<wchar_t>::format_float(
-    wchar_t *buffer, std::size_t size, const wchar_t *format, int precision,
+    wchar_t *buf, std::size_t size, const wchar_t *format, int precision,
     T value) {
   return precision < 0 ?
-      FMT_SWPRINTF(buffer, size, format, value) :
-      FMT_SWPRINTF(buffer, size, format, precision, value);
+      FMT_SWPRINTF(buf, size, format, value) :
+      FMT_SWPRINTF(buf, size, format, precision, value);
 }
 
 template <typename T>
@@ -337,6 +344,8 @@ const int16_t basic_data<T>::POW10_EXPONENTS[] = {
     827,   853,   880,   907,   933,   960,   986,  1013,  1039,  1066
 };
 
+template <typename T> const char basic_data<T>::FOREGROUND_COLOR[] = "\x1b[38;2;";
+template <typename T> const char basic_data<T>::BACKGROUND_COLOR[] = "\x1b[48;2;";
 template <typename T> const char basic_data<T>::RESET_COLOR[] = "\x1b[0m";
 template <typename T> const wchar_t basic_data<T>::WRESET_COLOR[] = L"\x1b[0m";
 
@@ -363,7 +372,7 @@ class fp {
     sizeof(significand_type) * char_size;
 
   fp(): f(0), e(0) {}
-  fp(uint64_t f, int e): f(f), e(e) {}
+  fp(uint64_t f_val, int e_val): f(f_val), e(e_val) {}
 
   // Constructs fp from an IEEE754 double. It is a template to prevent compile
   // errors on platforms where double is not IEEE754.
@@ -454,19 +463,28 @@ FMT_FUNC fp get_cached_power(int min_exponent, int &pow10_exponent) {
   return fp(data::POW10_SIGNIFICANDS[index], data::POW10_EXPONENTS[index]);
 }
 
+FMT_FUNC bool grisu2_round(
+    char *buf, int &size, int max_digits, uint64_t delta,
+    uint64_t remainder, uint64_t exp, uint64_t diff, int &exp10) {
+  while (remainder < diff && delta - remainder >= exp &&
+        (remainder + exp < diff || diff - remainder > remainder + exp - diff)) {
+    --buf[size - 1];
+    remainder += exp;
+  }
+  if (size > max_digits) {
+    --size;
+    ++exp10;
+    if (buf[size] >= '5')
+      return false;
+  }
+  return true;
+}
+
 // Generates output using Grisu2 digit-gen algorithm.
-FMT_FUNC void grisu2_gen_digits(
-    const fp &scaled_value, const fp &scaled_upper, uint64_t delta,
-    char *buffer, size_t &size, int &dec_exp) {
-  internal::fp one(1ull << -scaled_upper.e, scaled_upper.e);
-  // hi (p1 in Grisu) contains the most significant digits of scaled_upper.
-  // hi = floor(scaled_upper / one).
-  uint32_t hi = static_cast<uint32_t>(scaled_upper.f >> -one.e);
-  // lo (p2 in Grisu) contains the least significants digits of scaled_upper.
-  // lo = scaled_upper mod 1.
-  uint64_t lo = scaled_upper.f & (one.f - 1);
-  size = 0;
-  auto exp = count_digits(hi);  // kappa in Grisu.
+FMT_FUNC bool grisu2_gen_digits(
+    char *buf, int &size, uint32_t hi, uint64_t lo, int &exp,
+    uint64_t delta, const fp &one, const fp &diff, int max_digits) {
+  // Generate digits for the most significant part (hi).
   while (exp > 0) {
     uint32_t digit = 0;
     // This optimization by miloyip reduces the number of integer divisions by
@@ -486,148 +504,32 @@ FMT_FUNC void grisu2_gen_digits(
       FMT_ASSERT(false, "invalid number of digits");
     }
     if (digit != 0 || size != 0)
-      buffer[size++] = static_cast<char>('0' + digit);
+      buf[size++] = static_cast<char>('0' + digit);
     --exp;
     uint64_t remainder = (static_cast<uint64_t>(hi) << -one.e) + lo;
-    if (remainder <= delta) {
-      dec_exp += exp;
-      // TODO: use scaled_value
-      (void)scaled_value;
-      return;
+    if (remainder <= delta || size > max_digits) {
+      return grisu2_round(
+            buf, size, max_digits, delta, remainder,
+            static_cast<uint64_t>(data::POWERS_OF_10_32[exp]) << -one.e,
+            diff.f, exp);
     }
   }
+  // Generate digits for the least significant part (lo).
   for (;;) {
     lo *= 10;
     delta *= 10;
     char digit = static_cast<char>(lo >> -one.e);
     if (digit != 0 || size != 0)
-      buffer[size++] = static_cast<char>('0' + digit);
+      buf[size++] = static_cast<char>('0' + digit);
     lo &= one.f - 1;
     --exp;
-    if (lo < delta) {
-      dec_exp += exp;
-      return;
+    if (lo < delta || size > max_digits) {
+      return grisu2_round(buf, size, max_digits, delta, lo, one.f,
+                          diff.f * data::POWERS_OF_10_32[-exp], exp);
     }
   }
 }
 
-FMT_FUNC void grisu2_format_positive(double value, char *buffer, size_t &size,
-                                     int &dec_exp) {
-  FMT_ASSERT(value > 0, "value is nonpositive");
-  fp fp_value(value);
-  fp lower, upper;  // w^- and w^+ in the Grisu paper.
-  fp_value.compute_boundaries(lower, upper);
-  // Find a cached power of 10 close to 1 / upper.
-  const int min_exp = -60;  // alpha in Grisu.
-  auto dec_pow = get_cached_power(  // \tilde{c}_{-k} in Grisu.
-      min_exp - (upper.e + fp::significand_size), dec_exp);
-  dec_exp = -dec_exp;
-  fp_value.normalize();
-  fp scaled_value = fp_value * dec_pow;
-  fp scaled_lower = lower * dec_pow;  // \tilde{M}^- in Grisu.
-  fp scaled_upper = upper * dec_pow;  // \tilde{M}^+ in Grisu.
-  ++scaled_lower.f;  // \tilde{M}^- + 1 ulp -> M^-_{\uparrow}.
-  --scaled_upper.f;  // \tilde{M}^+ - 1 ulp -> M^+_{\downarrow}.
-  uint64_t delta = scaled_upper.f - scaled_lower.f;
-  grisu2_gen_digits(scaled_value, scaled_upper, delta, buffer, size, dec_exp);
-}
-
-FMT_FUNC void round(char *buffer, size_t &size, int &exp,
-                    int digits_to_remove) {
-  size -= to_unsigned(digits_to_remove);
-  exp += digits_to_remove;
-  int digit = buffer[size] - '0';
-  // TODO: proper rounding and carry
-  if (digit > 5 || (digit == 5 && (digits_to_remove > 1 ||
-                                   (buffer[size - 1] - '0') % 2) != 0)) {
-    ++buffer[size - 1];
-  }
-}
-
-// Writes the exponent exp in the form "[+-]d{1,3}" to buffer.
-FMT_FUNC char *write_exponent(char *buffer, int exp) {
-  FMT_ASSERT(-1000 < exp && exp < 1000, "exponent out of range");
-  if (exp < 0) {
-    *buffer++ = '-';
-    exp = -exp;
-  } else {
-    *buffer++ = '+';
-  }
-  if (exp >= 100) {
-    *buffer++ = static_cast<char>('0' + exp / 100);
-    exp %= 100;
-    const char *d = data::DIGITS + exp * 2;
-    *buffer++ = d[0];
-    *buffer++ = d[1];
-  } else {
-    const char *d = data::DIGITS + exp * 2;
-    *buffer++ = d[0];
-    *buffer++ = d[1];
-  }
-  return buffer;
-}
-
-FMT_FUNC void format_exp_notation(
-    char *buffer, size_t &size, int exp, int precision, bool upper) {
-  // Insert a decimal point after the first digit and add an exponent.
-  std::memmove(buffer + 2, buffer + 1, size - 1);
-  buffer[1] = '.';
-  exp += static_cast<int>(size) - 1;
-  int num_digits = precision - static_cast<int>(size) + 1;
-  if (num_digits > 0) {
-    std::uninitialized_fill_n(buffer + size + 1, num_digits, '0');
-    size += to_unsigned(num_digits);
-  } else if (num_digits < 0) {
-    round(buffer, size, exp, -num_digits);
-  }
-  char *p = buffer + size + 1;
-  *p++ = upper ? 'E' : 'e';
-  size = to_unsigned(write_exponent(p, exp) - buffer);
-}
-
-// Prettifies the output of the Grisu2 algorithm.
-// The number is given as v = buffer * 10^exp.
-FMT_FUNC void grisu2_prettify(char *buffer, size_t &size, int exp,
-                              int precision, bool upper) {
-  // pow(10, full_exp - 1) <= v <= pow(10, full_exp).
-  int int_size = static_cast<int>(size);
-  int full_exp = int_size + exp;
-  const int exp_threshold = 21;
-  if (int_size <= full_exp && full_exp <= exp_threshold) {
-    // 1234e7 -> 12340000000[.0+]
-    std::uninitialized_fill_n(buffer + int_size, full_exp - int_size, '0');
-    char *p = buffer + full_exp;
-    if (precision > 0) {
-      *p++ = '.';
-      std::uninitialized_fill_n(p, precision, '0');
-      p += precision;
-    }
-    size = to_unsigned(p - buffer);
-  } else if (0 < full_exp && full_exp <= exp_threshold) {
-    // 1234e-2 -> 12.34[0+]
-    int fractional_size = -exp;
-    std::memmove(buffer + full_exp + 1, buffer + full_exp,
-                 to_unsigned(fractional_size));
-    buffer[full_exp] = '.';
-    int num_zeros = precision - fractional_size;
-    if (num_zeros > 0) {
-      std::uninitialized_fill_n(buffer + size + 1, num_zeros, '0');
-      size += to_unsigned(num_zeros);
-    }
-    ++size;
-  } else if (-6 < full_exp && full_exp <= 0) {
-    // 1234e-6 -> 0.001234
-    int offset = 2 - full_exp;
-    std::memmove(buffer + offset, buffer, size);
-    buffer[0] = '0';
-    buffer[1] = '.';
-    std::uninitialized_fill_n(buffer + 2, -full_exp, '0');
-    size = to_unsigned(int_size + offset);
-  } else {
-    format_exp_notation(buffer, size, exp, precision, upper);
-  }
-}
-
 #if FMT_CLANG_VERSION
 # define FMT_FALLTHROUGH [[clang::fallthrough]];
 #elif FMT_GCC_VERSION >= 700
@@ -636,58 +538,270 @@ FMT_FUNC void grisu2_prettify(char *buffer, size_t &size, int exp,
 # define FMT_FALLTHROUGH
 #endif
 
-// Formats a nonnegative value using Grisu2 algorithm. Grisu2 doesn't give any
-// guarantees on the shortness of the result.
-FMT_FUNC void grisu2_format(double value, char *buffer, size_t &size, char type,
-                            int precision, bool write_decimal_point) {
-  FMT_ASSERT(value >= 0, "value is negative");
-  int dec_exp = 0;  // K in Grisu.
-  if (value > 0) {
-    grisu2_format_positive(value, buffer, size, dec_exp);
+struct gen_digits_params {
+  int num_digits;
+  bool fixed;
+  bool upper;
+  bool trailing_zeros;
+};
+
+struct prettify_handler {
+  char *data;
+  ptrdiff_t size;
+  buffer &buf;
+
+  explicit prettify_handler(buffer &b, ptrdiff_t n)
+    : data(b.data()), size(n), buf(b) {}
+  ~prettify_handler() {
+    assert(buf.size() >= to_unsigned(size));
+    buf.resize(to_unsigned(size));
+  }
+
+  template <typename F>
+  void insert(ptrdiff_t pos, ptrdiff_t n, F f) {
+    std::memmove(data + pos + n, data + pos, to_unsigned(size - pos));
+    f(data + pos);
+    size += n;
+  }
+
+  void insert(ptrdiff_t pos, char c) {
+    std::memmove(data + pos + 1, data + pos, to_unsigned(size - pos));
+    data[pos] = c;
+    ++size;
+  }
+
+  void append(ptrdiff_t n, char c) {
+    std::uninitialized_fill_n(data + size, n, c);
+    size += n;
+  }
+
+  void append(char c) { data[size++] = c; }
+
+  void remove_trailing(char c) {
+    while (data[size - 1] == c) --size;
+  }
+};
+
+// Writes the exponent exp in the form "[+-]d{2,3}" to buffer.
+template <typename Handler>
+FMT_FUNC void write_exponent(int exp, Handler &&h) {
+  FMT_ASSERT(-1000 < exp && exp < 1000, "exponent out of range");
+  if (exp < 0) {
+    h.append('-');
+    exp = -exp;
   } else {
-    *buffer = '0';
-    size = 1;
+    h.append('+');
   }
-  const int default_precision = 6;
-  if (precision < 0)
-    precision = default_precision;
-  bool upper = false;
-  switch (type) {
-  case 'G':
-    upper = true;
-    FMT_FALLTHROUGH
-  case '\0': case 'g': {
-    int digits_to_remove = static_cast<int>(size) - precision;
-    if (digits_to_remove > 0) {
-      round(buffer, size, dec_exp, digits_to_remove);
-      // Remove trailing zeros.
-      while (size > 0 && buffer[size - 1] == '0') {
-        --size;
-        ++dec_exp;
+  if (exp >= 100) {
+    h.append(static_cast<char>('0' + exp / 100));
+    exp %= 100;
+    const char *d = data::DIGITS + exp * 2;
+    h.append(d[0]);
+    h.append(d[1]);
+  } else {
+    const char *d = data::DIGITS + exp * 2;
+    h.append(d[0]);
+    h.append(d[1]);
   }
+}
+
+struct fill {
+  size_t n;
+  void operator()(char *buf) const {
+    buf[0] = '0';
+    buf[1] = '.';
+    std::uninitialized_fill_n(buf + 2, n, '0');
   }
-    precision = 0;
-    break;
-  }
-  case 'F':
-    upper = true;
-    FMT_FALLTHROUGH
-  case 'f': {
-    int digits_to_remove = -dec_exp - precision;
-    if (digits_to_remove > 0) {
-      if (digits_to_remove >= static_cast<int>(size))
-        digits_to_remove = static_cast<int>(size) - 1;
-      round(buffer, size, dec_exp, digits_to_remove);
-    }
-    break;
-  }
-  case 'e': case 'E':
-    format_exp_notation(buffer, size, dec_exp, precision, type == 'E');
+};
+
+// The number is given as v = f * pow(10, exp), where f has size digits.
+template <typename Handler>
+FMT_FUNC void grisu2_prettify(const gen_digits_params &params,
+                              int size, int exp, Handler &&handler) {
+  if (!params.fixed) {
+    // Insert a decimal point after the first digit and add an exponent.
+    handler.insert(1, '.');
+    exp += size - 1;
+    if (size < params.num_digits)
+      handler.append(params.num_digits - size, '0');
+    handler.append(params.upper ? 'E' : 'e');
+    write_exponent(exp, handler);
     return;
   }
-  if (write_decimal_point && precision < 1)
-    precision = 1;
-  grisu2_prettify(buffer, size, dec_exp, precision, upper);
+  // pow(10, full_exp - 1) <= v <= pow(10, full_exp).
+  int full_exp = size + exp;
+  const int exp_threshold = 21;
+  if (size <= full_exp && full_exp <= exp_threshold) {
+    // 1234e7 -> 12340000000[.0+]
+    handler.append(full_exp - size, '0');
+    int num_zeros = params.num_digits - full_exp;
+    if (num_zeros > 0 && params.trailing_zeros) {
+      handler.append('.');
+      handler.append(num_zeros, '0');
+    }
+  } else if (full_exp > 0) {
+    // 1234e-2 -> 12.34[0+]
+    handler.insert(full_exp, '.');
+    if (!params.trailing_zeros) {
+      // Remove trailing zeros.
+      handler.remove_trailing('0');
+    } else if (params.num_digits > size) {
+      // Add trailing zeros.
+      ptrdiff_t num_zeros = params.num_digits - size;
+      handler.append(num_zeros, '0');
+    }
+  } else {
+    // 1234e-6 -> 0.001234
+    handler.insert(0, 2 - full_exp, fill{to_unsigned(-full_exp)});
+  }
+}
+
+struct char_counter {
+  ptrdiff_t size;
+
+  template <typename F>
+  void insert(ptrdiff_t, ptrdiff_t n, F) { size += n; }
+  void insert(ptrdiff_t, char) { ++size; }
+  void append(ptrdiff_t n, char) { size += n; }
+  void append(char) { ++size; }
+  void remove_trailing(char) {}
+};
+
+// Converts format specifiers into parameters for digit generation and computes
+// output buffer size for a number in the range [pow(10, exp - 1), pow(10, exp)
+// or 0 if exp == 1.
+FMT_FUNC gen_digits_params process_specs(const core_format_specs &specs,
+                                         int exp, buffer &buf) {
+  auto params = gen_digits_params();
+  int num_digits = specs.precision >= 0 ? specs.precision : 6;
+  switch (specs.type) {
+  case 'G':
+    params.upper = true;
+    FMT_FALLTHROUGH
+  case '\0': case 'g':
+    params.trailing_zeros = (specs.flags & HASH_FLAG) != 0;
+    if (-4 <= exp && exp < num_digits + 1) {
+      params.fixed = true;
+      if (!specs.type && params.trailing_zeros && exp >= 0)
+        num_digits = exp + 1;
+    }
+    break;
+  case 'F':
+    params.upper = true;
+    FMT_FALLTHROUGH
+  case 'f': {
+    params.fixed = true;
+    params.trailing_zeros = true;
+    int adjusted_min_digits = num_digits + exp;
+    if (adjusted_min_digits > 0)
+      num_digits = adjusted_min_digits;
+    break;
+  }
+  case 'E':
+    params.upper = true;
+    FMT_FALLTHROUGH
+  case 'e':
+    ++num_digits;
+    break;
+  }
+  params.num_digits = num_digits;
+  char_counter counter{num_digits};
+  grisu2_prettify(params, params.num_digits, exp - num_digits, counter);
+  buf.resize(to_unsigned(counter.size));
+  return params;
+}
+
+template <typename Double>
+FMT_FUNC typename std::enable_if<sizeof(Double) == sizeof(uint64_t), bool>::type
+    grisu2_format(Double value, buffer &buf, core_format_specs specs) {
+  FMT_ASSERT(value >= 0, "value is negative");
+  if (value == 0) {
+    gen_digits_params params = process_specs(specs, 1, buf);
+    const size_t size = 1;
+    buf[0] = '0';
+    grisu2_prettify(params, size, 0, prettify_handler(buf, size));
+    return true;
+  }
+
+  fp fp_value(value);
+  fp lower, upper;  // w^- and w^+ in the Grisu paper.
+  fp_value.compute_boundaries(lower, upper);
+
+  // Find a cached power of 10 close to 1 / upper and use it to scale upper.
+  const int min_exp = -60;  // alpha in Grisu.
+  int cached_exp = 0;  // K in Grisu.
+  auto cached_pow = get_cached_power(  // \tilde{c}_{-k} in Grisu.
+      min_exp - (upper.e + fp::significand_size), cached_exp);
+  cached_exp = -cached_exp;
+  upper = upper * cached_pow;  // \tilde{M}^+ in Grisu.
+  --upper.f;  // \tilde{M}^+ - 1 ulp -> M^+_{\downarrow}.
+  fp one(1ull << -upper.e, upper.e);
+  // hi (p1 in Grisu) contains the most significant digits of scaled_upper.
+  // hi = floor(upper / one).
+  uint32_t hi = static_cast<uint32_t>(upper.f >> -one.e);
+  int exp = count_digits(hi);  // kappa in Grisu.
+  gen_digits_params params = process_specs(specs, cached_exp + exp, buf);
+  fp_value.normalize();
+  fp scaled_value = fp_value * cached_pow;
+  lower = lower * cached_pow;  // \tilde{M}^- in Grisu.
+  ++lower.f;  // \tilde{M}^- + 1 ulp -> M^-_{\uparrow}.
+  uint64_t delta = upper.f - lower.f;
+  fp diff = upper - scaled_value; // wp_w in Grisu.
+  // lo (p2 in Grisu) contains the least significants digits of scaled_upper.
+  // lo = supper % one.
+  uint64_t lo = upper.f & (one.f - 1);
+  int size = 0;
+  if (!grisu2_gen_digits(buf.data(), size, hi, lo, exp, delta, one, diff,
+                         params.num_digits)) {
+    buf.clear();
+    return false;
+  }
+  grisu2_prettify(params, size, cached_exp + exp, prettify_handler(buf, size));
+  return true;
+}
+
+template <typename Double>
+void sprintf_format(Double value, internal::buffer &buf,
+                    core_format_specs spec) {
+  // Buffer capacity must be non-zero, otherwise MSVC's vsnprintf_s will fail.
+  FMT_ASSERT(buf.capacity() != 0, "empty buffer");
+
+  // Build format string.
+  enum { MAX_FORMAT_SIZE = 10}; // longest format: %#-*.*Lg
+  char format[MAX_FORMAT_SIZE];
+  char *format_ptr = format;
+  *format_ptr++ = '%';
+  if (spec.has(HASH_FLAG))
+    *format_ptr++ = '#';
+  if (spec.precision >= 0) {
+    *format_ptr++ = '.';
+    *format_ptr++ = '*';
+  }
+  if (std::is_same<Double, long double>::value)
+    *format_ptr++ = 'L';
+  *format_ptr++ = spec.type;
+  *format_ptr = '\0';
+
+  // Format using snprintf.
+  char *start = FMT_NULL;
+  for (;;) {
+    std::size_t buffer_size = buf.capacity();
+    start = &buf[0];
+    int result = internal::char_traits<char>::format_float(
+        start, buffer_size, format, spec.precision, value);
+    if (result >= 0) {
+      unsigned n = internal::to_unsigned(result);
+      if (n < buf.capacity()) {
+        buf.resize(n);
+        break;  // The buffer is large enough - continue with formatting.
+      }
+      buf.reserve(n + 1);
+    } else {
+      // If result is negative we ask to increase the capacity by at least 1,
+      // but as std::vector, the buffer grows exponentially.
+      buf.reserve(buf.capacity() + 1);
+    }
+  }
 }
 }  // namespace internal
 
@@ -812,11 +926,6 @@ FMT_FUNC void format_system_error(
   format_error_code(out, error_code, message);
 }
 
-template <typename Char>
-void basic_fixed_buffer<Char>::grow(std::size_t) {
-  FMT_THROW(std::runtime_error("buffer overflow"));
-}
-
 FMT_FUNC void internal::error_handler::on_error(const char *message) {
   FMT_THROW(format_error(message));
 }
@@ -835,13 +944,14 @@ FMT_FUNC void report_windows_error(
 
 FMT_FUNC void vprint(std::FILE *f, string_view format_str, format_args args) {
   memory_buffer buffer;
-  vformat_to(buffer, format_str, args);
+  internal::vformat_to(buffer, format_str,
+                       basic_format_args<buffer_context<char>::type>(args));
   std::fwrite(buffer.data(), 1, buffer.size(), f);
 }
 
 FMT_FUNC void vprint(std::FILE *f, wstring_view format_str, wformat_args args) {
   wmemory_buffer buffer;
-  vformat_to(buffer, format_str, args);
+  internal::vformat_to(buffer, format_str, args);
   std::fwrite(buffer.data(), sizeof(wchar_t), buffer.size(), f);
 }
 
@@ -853,10 +963,6 @@ FMT_FUNC void vprint(wstring_view format_str, wformat_args args) {
   vprint(stdout, format_str, args);
 }
 
-#if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
-FMT_FUNC locale locale_provider::locale() { return fmt::locale(); }
-#endif
-
 FMT_END_NAMESPACE
 
 #ifdef _MSC_VER

externals/fmt/include/fmt/locale.h

@@ -0,0 +1,77 @@
+// Formatting library for C++ - std::locale support
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_LOCALE_H_
+#define FMT_LOCALE_H_
+
+#include "format.h"
+#include <locale>
+
+FMT_BEGIN_NAMESPACE
+
+namespace internal {
+template <typename Char>
+typename buffer_context<Char>::type::iterator vformat_to(
+    const std::locale &loc, basic_buffer<Char> &buf,
+    basic_string_view<Char> format_str,
+    basic_format_args<typename buffer_context<Char>::type> args) {
+  typedef back_insert_range<basic_buffer<Char> > range;
+  return vformat_to<arg_formatter<range>>(
+    buf, to_string_view(format_str), args, internal::locale_ref(loc));
+}
+
+template <typename Char>
+std::basic_string<Char> vformat(
+    const std::locale &loc, basic_string_view<Char> format_str,
+    basic_format_args<typename buffer_context<Char>::type> args) {
+  basic_memory_buffer<Char> buffer;
+  internal::vformat_to(loc, buffer, format_str, args);
+  return fmt::to_string(buffer);
+}
+}
+
+template <typename S, typename Char = FMT_CHAR(S)>
+inline std::basic_string<Char> vformat(
+    const std::locale &loc, const S &format_str,
+    basic_format_args<typename buffer_context<Char>::type> args) {
+  return internal::vformat(loc, to_string_view(format_str), args);
+}
+
+template <typename S, typename... Args>
+inline std::basic_string<FMT_CHAR(S)> format(
+    const std::locale &loc, const S &format_str, const Args &... args) {
+  return internal::vformat(
+    loc, to_string_view(format_str),
+    *internal::checked_args<S, Args...>(format_str, args...));
+}
+
+template <typename String, typename OutputIt, typename... Args>
+inline typename std::enable_if<internal::is_output_iterator<OutputIt>::value,
+                               OutputIt>::type
+    vformat_to(OutputIt out, const std::locale &loc, const String &format_str,
+               typename format_args_t<OutputIt, FMT_CHAR(String)>::type args) {
+  typedef output_range<OutputIt, FMT_CHAR(String)> range;
+  return vformat_to<arg_formatter<range>>(
+    range(out), to_string_view(format_str), args, internal::locale_ref(loc));
+}
+
+template <typename OutputIt, typename S, typename... Args>
+inline typename std::enable_if<
+    internal::is_string<S>::value &&
+    internal::is_output_iterator<OutputIt>::value, OutputIt>::type
+    format_to(OutputIt out, const std::locale &loc, const S &format_str,
+              const Args &... args) {
+  internal::check_format_string<Args...>(format_str);
+  typedef typename format_context_t<OutputIt, FMT_CHAR(S)>::type context;
+  format_arg_store<context, Args...> as{args...};
+  return vformat_to(out, loc, to_string_view(format_str),
+                    basic_format_args<context>(as));
+}
+
+FMT_END_NAMESPACE
+
+#endif  // FMT_LOCALE_H_

externals/fmt/include/fmt/ostream.h

@@ -1,6 +1,6 @@
 // Formatting library for C++ - std::ostream support
 //
-// Copyright (c) 2012 - 2016, Victor Zverovich
+// Copyright (c) 2012 - present, Victor Zverovich
 // All rights reserved.
 //
 // For the license information refer to format.h.
@@ -129,7 +129,7 @@ inline void vprint(std::basic_ostream<Char> &os,
                    basic_string_view<Char> format_str,
                    basic_format_args<typename buffer_context<Char>::type> args) {
   basic_memory_buffer<Char> buffer;
-  vformat_to(buffer, format_str, args);
+  internal::vformat_to(buffer, format_str, args);
   internal::write(os, buffer);
 }
 /**
@@ -141,16 +141,12 @@ inline void vprint(std::basic_ostream<Char> &os,
     fmt::print(cerr, "Don't {}!", "panic");
   \endrst
  */
-template <typename... Args>
-inline void print(std::ostream &os, string_view format_str,
+template <typename S, typename... Args>
+inline typename std::enable_if<internal::is_string<S>::value>::type
+print(std::basic_ostream<FMT_CHAR(S)> &os, const S &format_str,
       const Args & ... args) {
-  vprint<char>(os, format_str, make_format_args<format_context>(args...));
-}
-
-template <typename... Args>
-inline void print(std::wostream &os, wstring_view format_str,
-                  const Args & ... args) {
-  vprint<wchar_t>(os, format_str, make_format_args<wformat_context>(args...));
+  internal::checked_args<S, Args...> ca(format_str, args...);
+  vprint(os, to_string_view(format_str), *ca);
 }
 FMT_END_NAMESPACE
 

externals/fmt/include/fmt/posix.h

@@ -137,7 +137,7 @@ class buffered_file {
   buffered_file() FMT_NOEXCEPT : file_(FMT_NULL) {}
 
   // Destroys the object closing the file it represents if any.
-  FMT_API ~buffered_file() FMT_DTOR_NOEXCEPT;
+  FMT_API ~buffered_file() FMT_NOEXCEPT;
 
  private:
   buffered_file(const buffered_file &) = delete;
@@ -223,7 +223,7 @@ class file {
   }
 
   // Destroys the object closing the file it represents if any.
-  FMT_API ~file() FMT_DTOR_NOEXCEPT;
+  FMT_API ~file() FMT_NOEXCEPT;
 
   // Returns the file descriptor.
   int descriptor() const FMT_NOEXCEPT { return fd_; }

externals/fmt/include/fmt/printf.h

@@ -16,6 +16,130 @@
 FMT_BEGIN_NAMESPACE
 namespace internal {
 
+// An iterator that produces a null terminator on *end. This simplifies parsing
+// and allows comparing the performance of processing a null-terminated string
+// vs string_view.
+template <typename Char>
+class null_terminating_iterator {
+ public:
+  typedef std::ptrdiff_t difference_type;
+  typedef Char value_type;
+  typedef const Char* pointer;
+  typedef const Char& reference;
+  typedef std::random_access_iterator_tag iterator_category;
+
+  null_terminating_iterator() : ptr_(0), end_(0) {}
+
+  FMT_CONSTEXPR null_terminating_iterator(const Char *ptr, const Char *end)
+    : ptr_(ptr), end_(end) {}
+
+  template <typename Range>
+  FMT_CONSTEXPR explicit null_terminating_iterator(const Range &r)
+    : ptr_(r.begin()), end_(r.end()) {}
+
+  FMT_CONSTEXPR null_terminating_iterator &operator=(const Char *ptr) {
+    assert(ptr <= end_);
+    ptr_ = ptr;
+    return *this;
+  }
+
+  FMT_CONSTEXPR Char operator*() const {
+    return ptr_ != end_ ? *ptr_ : Char();
+  }
+
+  FMT_CONSTEXPR null_terminating_iterator operator++() {
+    ++ptr_;
+    return *this;
+  }
+
+  FMT_CONSTEXPR null_terminating_iterator operator++(int) {
+    null_terminating_iterator result(*this);
+    ++ptr_;
+    return result;
+  }
+
+  FMT_CONSTEXPR null_terminating_iterator operator--() {
+    --ptr_;
+    return *this;
+  }
+
+  FMT_CONSTEXPR null_terminating_iterator operator+(difference_type n) {
+    return null_terminating_iterator(ptr_ + n, end_);
+  }
+
+  FMT_CONSTEXPR null_terminating_iterator operator-(difference_type n) {
+    return null_terminating_iterator(ptr_ - n, end_);
+  }
+
+  FMT_CONSTEXPR null_terminating_iterator operator+=(difference_type n) {
+    ptr_ += n;
+    return *this;
+  }
+
+  FMT_CONSTEXPR difference_type operator-(
+      null_terminating_iterator other) const {
+    return ptr_ - other.ptr_;
+  }
+
+  FMT_CONSTEXPR bool operator!=(null_terminating_iterator other) const {
+    return ptr_ != other.ptr_;
+  }
+
+  bool operator>=(null_terminating_iterator other) const {
+    return ptr_ >= other.ptr_;
+  }
+
+  // This should be a friend specialization pointer_from<Char> but the latter
+  // doesn't compile by gcc 5.1 due to a compiler bug.
+  template <typename CharT>
+  friend FMT_CONSTEXPR_DECL const CharT *pointer_from(
+      null_terminating_iterator<CharT> it);
+
+ private:
+  const Char *ptr_;
+  const Char *end_;
+};
+
+template <typename T>
+FMT_CONSTEXPR const T *pointer_from(const T *p) { return p; }
+
+template <typename Char>
+FMT_CONSTEXPR const Char *pointer_from(null_terminating_iterator<Char> it) {
+  return it.ptr_;
+}
+
+// DEPRECATED: Parses the input as an unsigned integer. This function assumes
+// that the first character is a digit and presence of a non-digit character at
+// the end.
+// it: an iterator pointing to the beginning of the input range.
+template <typename Iterator, typename ErrorHandler>
+FMT_CONSTEXPR unsigned parse_nonnegative_int(Iterator &it, ErrorHandler &&eh) {
+  assert('0' <= *it && *it <= '9');
+  if (*it == '0') {
+    ++it;
+    return 0;
+  }
+  unsigned value = 0;
+  // Convert to unsigned to prevent a warning.
+  unsigned max_int = (std::numeric_limits<int>::max)();
+  unsigned big = max_int / 10;
+  do {
+    // Check for overflow.
+    if (value > big) {
+      value = max_int + 1;
+      break;
+    }
+    value = value * 10 + unsigned(*it - '0');
+    // Workaround for MSVC "setup_exception stack overflow" error:
+    auto next = it;
+    ++next;
+    it = next;
+  } while ('0' <= *it && *it <= '9');
+  if (value > max_int)
+    eh.on_error("number is too big");
+  return value;
+}
+
 // Checks if a value fits in int - used to avoid warnings about comparing
 // signed and unsigned integers.
 template <bool IsSigned>
@@ -133,7 +257,7 @@ class arg_converter: public function<void> {
 // unsigned).
 template <typename T, typename Context, typename Char>
 void convert_arg(basic_format_arg<Context> &arg, Char type) {
-  fmt::visit(arg_converter<T, Context>(arg, type), arg);
+  visit_format_arg(arg_converter<T, Context>(arg, type), arg);
 }
 
 // Converts an integer argument to char for printf.
@@ -192,8 +316,16 @@ class printf_width_handler: public function<unsigned> {
     return 0;
   }
 };
+
+template <typename Char, typename Context>
+void printf(basic_buffer<Char> &buf, basic_string_view<Char> format,
+            basic_format_args<Context> args) {
+  Context(std::back_inserter(buf), format, args).format();
+}
 }  // namespace internal
 
+using internal::printf;  // For printing into memory_buffer.
+
 template <typename Range>
 class printf_arg_formatter;
 
@@ -222,12 +354,12 @@ class printf_arg_formatter:
   context_type &context_;
 
   void write_null_pointer(char) {
-    this->spec()->type_ = 0;
+    this->spec()->type = 0;
     this->write("(nil)");
   }
 
   void write_null_pointer(wchar_t) {
-    this->spec()->type_ = 0;
+    this->spec()->type = 0;
     this->write(L"(nil)");
   }
 
@@ -243,7 +375,8 @@ class printf_arg_formatter:
    */
   printf_arg_formatter(internal::basic_buffer<char_type> &buffer,
                        format_specs &spec, context_type &ctx)
-    : base(back_insert_range<internal::basic_buffer<char_type>>(buffer), &spec),
+    : base(back_insert_range<internal::basic_buffer<char_type>>(buffer), &spec,
+           ctx.locale()),
       context_(ctx) {}
 
   template <typename T>
@@ -253,15 +386,15 @@ class printf_arg_formatter:
     // use std::is_same instead.
     if (std::is_same<T, bool>::value) {
       format_specs &fmt_spec = *this->spec();
-      if (fmt_spec.type_ != 's')
+      if (fmt_spec.type != 's')
         return base::operator()(value ? 1 : 0);
-      fmt_spec.type_ = 0;
+      fmt_spec.type = 0;
       this->write(value != 0);
     } else if (std::is_same<T, char_type>::value) {
       format_specs &fmt_spec = *this->spec();
-      if (fmt_spec.type_ && fmt_spec.type_ != 'c')
+      if (fmt_spec.type && fmt_spec.type != 'c')
         return (*this)(static_cast<int>(value));
-      fmt_spec.flags_ = 0;
+      fmt_spec.flags = 0;
       fmt_spec.align_ = ALIGN_RIGHT;
       return base::operator()(value);
     } else {
@@ -280,7 +413,7 @@ class printf_arg_formatter:
   iterator operator()(const char *value) {
     if (value)
       base::operator()(value);
-    else if (this->spec()->type_ == 'p')
+    else if (this->spec()->type == 'p')
       write_null_pointer(char_type());
     else
       this->write("(null)");
@@ -291,7 +424,7 @@ class printf_arg_formatter:
   iterator operator()(const wchar_t *value) {
     if (value)
       base::operator()(value);
-    else if (this->spec()->type_ == 'p')
+    else if (this->spec()->type == 'p')
       write_null_pointer(char_type());
     else
       this->write(L"(null)");
@@ -310,7 +443,7 @@ class printf_arg_formatter:
   iterator operator()(const void *value) {
     if (value)
       return base::operator()(value);
-    this->spec()->type_ = 0;
+    this->spec()->type = 0;
     write_null_pointer(char_type());
     return this->out();
   }
@@ -394,16 +527,16 @@ void basic_printf_context<OutputIt, Char, AF>::parse_flags(
         spec.align_ = ALIGN_LEFT;
         break;
       case '+':
-        spec.flags_ |= SIGN_FLAG | PLUS_FLAG;
+        spec.flags |= SIGN_FLAG | PLUS_FLAG;
         break;
       case '0':
         spec.fill_ = '0';
         break;
       case ' ':
-        spec.flags_ |= SIGN_FLAG;
+        spec.flags |= SIGN_FLAG;
         break;
       case '#':
-        spec.flags_ |= HASH_FLAG;
+        spec.flags |= HASH_FLAG;
         break;
       default:
         --it;
@@ -453,8 +586,8 @@ unsigned basic_printf_context<OutputIt, Char, AF>::parse_header(
     spec.width_ = parse_nonnegative_int(it, eh);
   } else if (*it == '*') {
     ++it;
-    spec.width_ =
-        fmt::visit(internal::printf_width_handler<char_type>(spec), get_arg(it));
+    spec.width_ = visit_format_arg(
+          internal::printf_width_handler<char_type>(spec), get_arg(it));
   }
   return arg_index;
 }
@@ -486,19 +619,19 @@ void basic_printf_context<OutputIt, Char, AF>::format() {
       ++it;
       if ('0' <= *it && *it <= '9') {
         internal::error_handler eh;
-        spec.precision_ = static_cast<int>(parse_nonnegative_int(it, eh));
+        spec.precision = static_cast<int>(parse_nonnegative_int(it, eh));
       } else if (*it == '*') {
         ++it;
-        spec.precision_ =
-            fmt::visit(internal::printf_precision_handler(), get_arg(it));
+        spec.precision =
+            visit_format_arg(internal::printf_precision_handler(), get_arg(it));
       } else {
-        spec.precision_ = 0;
+        spec.precision = 0;
       }
     }
 
     format_arg arg = get_arg(it, arg_index);
-    if (spec.flag(HASH_FLAG) && fmt::visit(internal::is_zero_int(), arg))
-      spec.flags_ &= ~internal::to_unsigned<int>(HASH_FLAG);
+    if (spec.has(HASH_FLAG) && visit_format_arg(internal::is_zero_int(), arg))
+      spec.flags = static_cast<uint_least8_t>(spec.flags & (~internal::to_unsigned<int>(HASH_FLAG)));
     if (spec.fill_ == '0') {
       if (arg.is_arithmetic())
         spec.align_ = ALIGN_NUMERIC;
@@ -542,16 +675,17 @@ void basic_printf_context<OutputIt, Char, AF>::format() {
     // Parse type.
     if (!*it)
       FMT_THROW(format_error("invalid format string"));
-    spec.type_ = static_cast<char>(*it++);
+    spec.type = static_cast<char>(*it++);
     if (arg.is_integral()) {
       // Normalize type.
-      switch (spec.type_) {
+      switch (spec.type) {
       case 'i': case 'u':
-        spec.type_ = 'd';
+        spec.type = 'd';
         break;
       case 'c':
         // TODO: handle wchar_t better?
-        fmt::visit(internal::char_converter<basic_printf_context>(arg), arg);
+        visit_format_arg(
+              internal::char_converter<basic_printf_context>(arg), arg);
         break;
       }
     }
@@ -559,35 +693,50 @@ void basic_printf_context<OutputIt, Char, AF>::format() {
     start = it;
 
     // Format argument.
-    fmt::visit(AF(buffer, spec, *this), arg);
+    visit_format_arg(AF(buffer, spec, *this), arg);
   }
   buffer.append(pointer_from(start), pointer_from(it));
 }
 
-template <typename Char, typename Context>
-void printf(internal::basic_buffer<Char> &buf, basic_string_view<Char> format,
-            basic_format_args<Context> args) {
-  Context(std::back_inserter(buf), format, args).format();
-}
-
 template <typename Buffer>
-struct printf_context {
+struct basic_printf_context_t {
   typedef basic_printf_context<
     std::back_insert_iterator<Buffer>, typename Buffer::value_type> type;
 };
 
-template <typename ...Args>
-inline format_arg_store<printf_context<internal::buffer>::type, Args...>
-    make_printf_args(const Args & ... args) {
-  return format_arg_store<printf_context<internal::buffer>::type, Args...>(
-      args...);
-}
-typedef basic_format_args<printf_context<internal::buffer>::type> printf_args;
-typedef basic_format_args<printf_context<internal::wbuffer>::type> wprintf_args;
+typedef basic_printf_context_t<internal::buffer>::type printf_context;
+typedef basic_printf_context_t<internal::wbuffer>::type wprintf_context;
 
-inline std::string vsprintf(string_view format, printf_args args) {
-  memory_buffer buffer;
-  printf(buffer, format, args);
+typedef basic_format_args<printf_context> printf_args;
+typedef basic_format_args<wprintf_context> wprintf_args;
+
+/**
+  \rst
+  Constructs an `~fmt::format_arg_store` object that contains references to
+  arguments and can be implicitly converted to `~fmt::printf_args`. 
+  \endrst
+ */
+template<typename... Args>
+inline format_arg_store<printf_context, Args...>
+  make_printf_args(const Args &... args) { return {args...}; }
+
+/**
+  \rst
+  Constructs an `~fmt::format_arg_store` object that contains references to
+  arguments and can be implicitly converted to `~fmt::wprintf_args`. 
+  \endrst
+ */
+template<typename... Args>
+inline format_arg_store<wprintf_context, Args...>
+  make_wprintf_args(const Args &... args) { return {args...}; }
+
+template <typename S, typename Char = FMT_CHAR(S)>
+inline std::basic_string<Char>
+vsprintf(const S &format,
+         basic_format_args<typename basic_printf_context_t<
+           internal::basic_buffer<Char>>::type> args) {
+  basic_memory_buffer<Char> buffer;
+  printf(buffer, to_string_view(format), args);
   return to_string(buffer);
 }
 
@@ -600,30 +749,24 @@ inline std::string vsprintf(string_view format, printf_args args) {
     std::string message = fmt::sprintf("The answer is %d", 42);
   \endrst
 */
-template <typename... Args>
-inline std::string sprintf(string_view format_str, const Args & ... args) {
-  return vsprintf(format_str,
-    make_format_args<typename printf_context<internal::buffer>::type>(args...));
+template <typename S, typename... Args>
+inline FMT_ENABLE_IF_T(
+    internal::is_string<S>::value, std::basic_string<FMT_CHAR(S)>)
+    sprintf(const S &format, const Args & ... args) {
+  internal::check_format_string<Args...>(format);
+  typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
+  typedef typename basic_printf_context_t<buffer>::type context;
+  format_arg_store<context, Args...> as{ args... };
+  return vsprintf(to_string_view(format),
+                  basic_format_args<context>(as));
 }
 
-inline std::wstring vsprintf(wstring_view format, wprintf_args args) {
-  wmemory_buffer buffer;
-  printf(buffer, format, args);
-  return to_string(buffer);
-}
-
-template <typename... Args>
-inline std::wstring sprintf(wstring_view format_str, const Args & ... args) {
-  return vsprintf(format_str,
-    make_format_args<typename printf_context<internal::wbuffer>::type>(args...));
-}
-
-template <typename Char>
-inline int vfprintf(std::FILE *f, basic_string_view<Char> format,
-                    basic_format_args<typename printf_context<
+template <typename S, typename Char = FMT_CHAR(S)>
+inline int vfprintf(std::FILE *f, const S &format,
+                    basic_format_args<typename basic_printf_context_t<
                       internal::basic_buffer<Char>>::type> args) {
   basic_memory_buffer<Char> buffer;
-  printf(buffer, format, args);
+  printf(buffer, to_string_view(format), args);
   std::size_t size = buffer.size();
   return std::fwrite(
     buffer.data(), sizeof(Char), size, f) < size ? -1 : static_cast<int>(size);
@@ -638,26 +781,22 @@ inline int vfprintf(std::FILE *f, basic_string_view<Char> format,
     fmt::fprintf(stderr, "Don't %s!", "panic");
   \endrst
  */
-template <typename... Args>
-inline int fprintf(std::FILE *f, string_view format_str, const Args & ... args) {
-  auto vargs = make_format_args<
-    typename printf_context<internal::buffer>::type>(args...);
-  return vfprintf<char>(f, format_str, vargs);
+template <typename S, typename... Args>
+inline FMT_ENABLE_IF_T(internal::is_string<S>::value, int)
+    fprintf(std::FILE *f, const S &format, const Args & ... args) {
+  internal::check_format_string<Args...>(format);
+  typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
+  typedef typename basic_printf_context_t<buffer>::type context;
+  format_arg_store<context, Args...> as{ args... };
+  return vfprintf(f, to_string_view(format),
+                  basic_format_args<context>(as));
 }
 
-template <typename... Args>
-inline int fprintf(std::FILE *f, wstring_view format_str,
-                   const Args & ... args) {
-  return vfprintf(f, format_str,
-    make_format_args<typename printf_context<internal::wbuffer>::type>(args...));
-}
-
-inline int vprintf(string_view format, printf_args args) {
-  return vfprintf(stdout, format, args);
-}
-
-inline int vprintf(wstring_view format, wprintf_args args) {
-  return vfprintf(stdout, format, args);
+template <typename S, typename Char = FMT_CHAR(S)>
+inline int vprintf(const S &format,
+                   basic_format_args<typename basic_printf_context_t<
+                    internal::basic_buffer<Char>>::type> args) {
+  return vfprintf(stdout, to_string_view(format), args);
 }
 
 /**
@@ -669,30 +808,24 @@ inline int vprintf(wstring_view format, wprintf_args args) {
     fmt::printf("Elapsed time: %.2f seconds", 1.23);
   \endrst
  */
-template <typename... Args>
-inline int printf(string_view format_str, const Args & ... args) {
-  return vprintf(format_str,
-    make_format_args<typename printf_context<internal::buffer>::type>(args...));
+template <typename S, typename... Args>
+inline FMT_ENABLE_IF_T(internal::is_string<S>::value, int)
+    printf(const S &format_str, const Args & ... args) {
+  internal::check_format_string<Args...>(format_str);
+  typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
+  typedef typename basic_printf_context_t<buffer>::type context;
+  format_arg_store<context, Args...> as{ args... };
+  return vprintf(to_string_view(format_str),
+                 basic_format_args<context>(as));
 }
 
-template <typename... Args>
-inline int printf(wstring_view format_str, const Args & ... args) {
-  return vprintf(format_str,
-    make_format_args<typename printf_context<internal::wbuffer>::type>(args...));
-}
-
-inline int vfprintf(std::ostream &os, string_view format_str,
-                    printf_args args) {
-  memory_buffer buffer;
-  printf(buffer, format_str, args);
-  internal::write(os, buffer);
-  return static_cast<int>(buffer.size());
-}
-
-inline int vfprintf(std::wostream &os, wstring_view format_str,
-                    wprintf_args args) {
-  wmemory_buffer buffer;
-  printf(buffer, format_str, args);
+template <typename S, typename Char = FMT_CHAR(S)>
+inline int vfprintf(std::basic_ostream<Char> &os,
+                    const S &format,
+                    basic_format_args<typename basic_printf_context_t<
+                      internal::basic_buffer<Char>>::type> args) {
+  basic_memory_buffer<Char> buffer;
+  printf(buffer, to_string_view(format), args);
   internal::write(os, buffer);
   return static_cast<int>(buffer.size());
 }
@@ -706,20 +839,16 @@ inline int vfprintf(std::wostream &os, wstring_view format_str,
     fmt::fprintf(cerr, "Don't %s!", "panic");
   \endrst
  */
-template <typename... Args>
-inline int fprintf(std::ostream &os, string_view format_str,
-                   const Args & ... args) {
-  auto vargs = make_format_args<
-    typename printf_context<internal::buffer>::type>(args...);
-  return vfprintf(os, format_str, vargs);
-}
-
-template <typename... Args>
-inline int fprintf(std::wostream &os, wstring_view format_str,
-                   const Args & ... args) {
-  auto vargs = make_format_args<
-    typename printf_context<internal::buffer>::type>(args...);
-  return vfprintf(os, format_str, vargs);
+template <typename S, typename... Args>
+inline FMT_ENABLE_IF_T(internal::is_string<S>::value, int)
+    fprintf(std::basic_ostream<FMT_CHAR(S)> &os,
+            const S &format_str, const Args & ... args) {
+  internal::check_format_string<Args...>(format_str);
+  typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
+  typedef typename basic_printf_context_t<buffer>::type context;
+  format_arg_store<context, Args...> as{ args... };
+  return vfprintf(os, to_string_view(format_str),
+                  basic_format_args<context>(as));
 }
 FMT_END_NAMESPACE
 

externals/fmt/include/fmt/time.h

@@ -1,6 +1,6 @@
 // Formatting library for C++ - time formatting
 //
-// Copyright (c) 2012 - 2016, Victor Zverovich
+// Copyright (c) 2012 - present, Victor Zverovich
 // All rights reserved.
 //
 // For the license information refer to format.h.
@@ -10,6 +10,7 @@
 
 #include "format.h"
 #include <ctime>
+#include <locale>
 
 FMT_BEGIN_NAMESPACE
 
@@ -22,7 +23,7 @@ inline null<> localtime_r FMT_NOMACRO(...) { return null<>(); }
 inline null<> localtime_s(...) { return null<>(); }
 inline null<> gmtime_r(...) { return null<>(); }
 inline null<> gmtime_s(...) { return null<>(); }
-}
+}  // namespace internal
 
 // Thread-safe replacement for std::localtime
 inline std::tm localtime(std::time_t time) {
@@ -46,18 +47,20 @@ inline std::tm localtime(std::time_t time) {
 
     bool fallback(int res) { return res == 0; }
 
+#if !FMT_MSC_VER
     bool fallback(internal::null<>) {
       using namespace fmt::internal;
       std::tm *tm = std::localtime(&time_);
       if (tm) tm_ = *tm;
       return tm != FMT_NULL;
     }
+#endif
   };
   dispatcher lt(time);
-  if (lt.run())
-    return lt.tm_;
   // Too big time values may be unsupported.
+  if (!lt.run())
     FMT_THROW(format_error("time_t value out of range"));
+  return lt.tm_;
 }
 
 // Thread-safe replacement for std::gmtime
@@ -82,17 +85,19 @@ inline std::tm gmtime(std::time_t time) {
 
     bool fallback(int res) { return res == 0; }
 
+#if !FMT_MSC_VER
     bool fallback(internal::null<>) {
       std::tm *tm = std::gmtime(&time_);
       if (tm) tm_ = *tm;
       return tm != FMT_NULL;
     }
+#endif
   };
   dispatcher gt(time);
-  if (gt.run())
-    return gt.tm_;
   // Too big time values may be unsupported.
+  if (!gt.run())
     FMT_THROW(format_error("time_t value out of range"));
+  return gt.tm_;
 }
 
 namespace internal {
@@ -111,22 +116,21 @@ template <typename Char>
 struct formatter<std::tm, Char> {
   template <typename ParseContext>
   auto parse(ParseContext &ctx) -> decltype(ctx.begin()) {
-    auto it = internal::null_terminating_iterator<Char>(ctx);
-    if (*it == ':')
+    auto it = ctx.begin();
+    if (it != ctx.end() && *it == ':')
       ++it;
     auto end = it;
-    while (*end && *end != '}')
+    while (end != ctx.end() && *end != '}')
       ++end;
-    tm_format.reserve(end - it + 1);
-    using internal::pointer_from;
-    tm_format.append(pointer_from(it), pointer_from(end));
+    tm_format.reserve(internal::to_unsigned(end - it + 1));
+    tm_format.append(it, end);
     tm_format.push_back('\0');
-    return pointer_from(end);
+    return end;
   }
 
   template <typename FormatContext>
   auto format(const std::tm &tm, FormatContext &ctx) -> decltype(ctx.out()) {
-    internal::basic_buffer<Char> &buf = internal::get_container(ctx.out());
+    basic_memory_buffer<Char> buf;
     std::size_t start = buf.size();
     for (;;) {
       std::size_t size = buf.capacity() - start;
@@ -146,7 +150,7 @@ struct formatter<std::tm, Char> {
       const std::size_t MIN_GROWTH = 10;
       buf.reserve(buf.capacity() + (size > MIN_GROWTH ? size : MIN_GROWTH));
     }
-    return ctx.out();
+    return std::copy(buf.begin(), buf.end(), ctx.out());
   }
 
   basic_memory_buffer<Char> tm_format;

externals/fmt/src/format.cc

@@ -9,16 +9,16 @@
 
 FMT_BEGIN_NAMESPACE
 template struct internal::basic_data<void>;
+template FMT_API internal::locale_ref::locale_ref(const std::locale &loc);
+template FMT_API std::locale internal::locale_ref::get<std::locale>() const;
 
 // Explicit instantiations for char.
 
-template FMT_API char internal::thousands_sep(locale_provider *lp);
+template FMT_API char internal::thousands_sep_impl(locale_ref);
 
-template void internal::basic_buffer<char>::append(const char *, const char *);
+template FMT_API void internal::basic_buffer<char>::append(const char *, const char *);
 
-template void basic_fixed_buffer<char>::grow(std::size_t);
-
-template void internal::arg_map<format_context>::init(
+template FMT_API void internal::arg_map<format_context>::init(
     const basic_format_args<format_context> &args);
 
 template FMT_API int internal::char_traits<char>::format_float(
@@ -30,16 +30,22 @@ template FMT_API int internal::char_traits<char>::format_float(
 template FMT_API std::string internal::vformat<char>(
     string_view, basic_format_args<format_context>);
 
+template FMT_API format_context::iterator internal::vformat_to(
+    internal::buffer &, string_view, basic_format_args<format_context>);
+
+template FMT_API void internal::sprintf_format(
+    double, internal::buffer &, core_format_specs);
+template FMT_API void internal::sprintf_format(
+    long double, internal::buffer &, core_format_specs);
+
 // Explicit instantiations for wchar_t.
 
-template FMT_API wchar_t internal::thousands_sep(locale_provider *);
+template FMT_API wchar_t internal::thousands_sep_impl(locale_ref);
 
-template void internal::basic_buffer<wchar_t>::append(
+template FMT_API void internal::basic_buffer<wchar_t>::append(
     const wchar_t *, const wchar_t *);
 
-template void basic_fixed_buffer<wchar_t>::grow(std::size_t);
-
-template void internal::arg_map<wformat_context>::init(
+template FMT_API void internal::arg_map<wformat_context>::init(
     const basic_format_args<wformat_context> &);
 
 template FMT_API int internal::char_traits<wchar_t>::format_float(

externals/fmt/support/AndroidManifest.xml

@@ -1 +1 @@
-<manifest package="fmt" />
+<manifest package="net.fmtlib" />

externals/fmt/support/build.gradle

@@ -1,14 +1,24 @@
+
 // General gradle arguments for root project
 buildscript {    
     repositories {
         google()
         jcenter()
     }
-
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        //
+        // https://developer.android.com/studio/releases/gradle-plugin
+        //
+        // Notice that 3.1.3 here is the version of [Android Gradle Plugin]
+        // Accroding to URL above you will need Gradle 4.4 or higher
+        //
+        classpath 'com.android.tools.build:gradle:3.1.3'
     }
 }
+repositories {
+    google()
+    jcenter()
+}
     
 // Output: Shared library (.so) for Android 
 apply plugin: 'com.android.library'
@@ -24,20 +34,17 @@ android {
     splits {
         abi {
             enable true
-            // Be general, as much as possible ...
-            // universalApk true 
-
             // Specify platforms for Application
             reset()
-            include "x86", "x86_64", "armeabi-v7a", "arm64-v8a"
+            include  "arm64-v8a", "armeabi-v7a", "x86_64"
         }
     }
 
     defaultConfig {
         minSdkVersion 21    // Android 5.0+
         targetSdkVersion 25 // Follow Compile SDK
-        versionCode 16      // Follow release count
-        versionName "4.1.0" // Follow Official version
+        versionCode 20      // Follow release count
+        versionName "5.2.1" // Follow Official version
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         
         externalNativeBuild {
@@ -46,7 +53,7 @@ android {
                 arguments "-DBUILD_SHARED_LIBS=true"    // Build shared object
                 arguments "-DFMT_TEST=false"            // Skip test
                 arguments "-DFMT_DOC=false"             // Skip document
-                cppFlags  "-std=c++14"
+                cppFlags  "-std=c++17"
             }
         }
         println("Gradle CMake Plugin: ")

externals/fmt/support/cmake/fmt.pc.in

@@ -0,0 +1,11 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=@CMAKE_INSTALL_PREFIX@
+libdir=@CMAKE_INSTALL_FULL_LIBDIR@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+
+Name: fmt
+Description: A modern formatting library
+Version: @FMT_VERSION@
+Libs: -L${libdir} -lfmt
+Cflags: -I${includedir}
+

externals/fmt/support/rst2md.py

@@ -1,6 +1,7 @@
+#!/usr/bin/env python
 # reStructuredText (RST) to GitHub-flavored Markdown converter
 
-import re
+import re, sys
 from docutils import core, nodes, writers
 
 
@@ -35,6 +36,9 @@ class Translator(nodes.NodeVisitor):
         self.version = re.match(r'(\d+\.\d+\.\d+).*', node.children[0]).group(1)
         raise nodes.SkipChildren
 
+    def visit_title_reference(self, node):
+        raise Exception(node)
+
     def depart_title(self, node):
         pass
 
@@ -149,3 +153,7 @@ class MDWriter(writers.Writer):
 def convert(rst_path):
     """Converts RST file to Markdown."""
     return core.publish_file(source_path=rst_path, writer=MDWriter())
+
+
+if __name__ == '__main__':
+    convert(sys.argv[1])

externals/fmt/test/CMakeLists.txt

@@ -85,10 +85,14 @@ function(add_fmt_test name)
 endfunction()
 
 add_fmt_test(assert-test)
+add_fmt_test(chrono-test)
 add_fmt_test(core-test)
 add_fmt_test(gtest-extra-test)
 add_fmt_test(format-test mock-allocator.h)
-add_fmt_test(format-impl-test)
+if (NOT (MSVC AND BUILD_SHARED_LIBS))
+  add_fmt_test(format-impl-test)
+endif ()
+add_fmt_test(locale-test)
 add_fmt_test(ostream-test)
 add_fmt_test(printf-test)
 add_fmt_test(time-test)
@@ -165,8 +169,11 @@ if (FMT_PEDANTIC)
     "-DCXX_STANDARD_FLAG=${CXX_STANDARD_FLAG}"
     "-DPEDANTIC_COMPILE_FLAGS=${PEDANTIC_COMPILE_FLAGS}"
     "-DSUPPORTS_USER_DEFINED_LITERALS=${SUPPORTS_USER_DEFINED_LITERALS}")
+endif ()
 
-  # test if the targets are findable from the build directory
+# These tests are disabled on Windows because they take too long.
+if (FMT_PEDANTIC AND NOT WIN32)
+  # Test if the targets are found from the build directory.
   add_test(find-package-test ${CMAKE_CTEST_COMMAND}
     -C ${CMAKE_BUILD_TYPE}
     --build-and-test
@@ -181,7 +188,7 @@ if (FMT_PEDANTIC)
     "-DPEDANTIC_COMPILE_FLAGS=${PEDANTIC_COMPILE_FLAGS}"
     "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}")
 
-  # test if the targets are findable when add_subdirectory is used
+  # Test if the targets are found when add_subdirectory is used.
   add_test(add-subdirectory-test ${CMAKE_CTEST_COMMAND}
     -C ${CMAKE_BUILD_TYPE}
     --build-and-test

externals/fmt/test/chrono-test.cc

@@ -0,0 +1,185 @@
+// Formatting library for C++ - time formatting tests
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include "fmt/chrono.h"
+#include "gtest-extra.h"
+
+#include <iomanip>
+
+std::tm make_tm() {
+  auto time = std::tm();
+  time.tm_mday = 1;
+  return time;
+}
+
+std::tm make_hour(int h) {
+  auto time = make_tm();
+  time.tm_hour = h;
+  return time;
+}
+
+std::tm make_minute(int m) {
+  auto time = make_tm();
+  time.tm_min = m;
+  return time;
+}
+
+std::tm make_second(int s) {
+  auto time = make_tm();
+  time.tm_sec = s;
+  return time;
+}
+
+std::string format_tm(const std::tm &time, const char *spec,
+                      const std::locale &loc) {
+  auto &facet = std::use_facet<std::time_put<char>>(loc);
+  std::ostringstream os;
+  os.imbue(loc);
+  facet.put(os, os, ' ', &time, spec, spec + std::strlen(spec));
+  return os.str();
+}
+
+#define EXPECT_TIME(spec, time, duration) { \
+    std::locale loc("ja_JP.utf8"); \
+    EXPECT_EQ(format_tm(time, spec, loc), \
+              fmt::format(loc, "{:" spec "}", duration)); \
+  }
+
+TEST(ChronoTest, FormatDefault) {
+  EXPECT_EQ("42s", fmt::format("{}", std::chrono::seconds(42)));
+  EXPECT_EQ("42as",
+            fmt::format("{}", std::chrono::duration<int, std::atto>(42)));
+  EXPECT_EQ("42fs",
+            fmt::format("{}", std::chrono::duration<int, std::femto>(42)));
+  EXPECT_EQ("42ps",
+            fmt::format("{}", std::chrono::duration<int, std::pico>(42)));
+  EXPECT_EQ("42ns", fmt::format("{}", std::chrono::nanoseconds(42)));
+  EXPECT_EQ("42µs", fmt::format("{}", std::chrono::microseconds(42)));
+  EXPECT_EQ("42ms", fmt::format("{}", std::chrono::milliseconds(42)));
+  EXPECT_EQ("42cs",
+            fmt::format("{}", std::chrono::duration<int, std::centi>(42)));
+  EXPECT_EQ("42ds",
+            fmt::format("{}", std::chrono::duration<int, std::deci>(42)));
+  EXPECT_EQ("42s", fmt::format("{}", std::chrono::seconds(42)));
+  EXPECT_EQ("42das",
+            fmt::format("{}", std::chrono::duration<int, std::deca>(42)));
+  EXPECT_EQ("42hs",
+            fmt::format("{}", std::chrono::duration<int, std::hecto>(42)));
+  EXPECT_EQ("42ks",
+            fmt::format("{}", std::chrono::duration<int, std::kilo>(42)));
+  EXPECT_EQ("42Ms",
+            fmt::format("{}", std::chrono::duration<int, std::mega>(42)));
+  EXPECT_EQ("42Gs",
+            fmt::format("{}", std::chrono::duration<int, std::giga>(42)));
+  EXPECT_EQ("42Ts",
+            fmt::format("{}", std::chrono::duration<int, std::tera>(42)));
+  EXPECT_EQ("42Ps",
+            fmt::format("{}", std::chrono::duration<int, std::peta>(42)));
+  EXPECT_EQ("42Es",
+            fmt::format("{}", std::chrono::duration<int, std::exa>(42)));
+  EXPECT_EQ("42m", fmt::format("{}", std::chrono::minutes(42)));
+  EXPECT_EQ("42h", fmt::format("{}", std::chrono::hours(42)));
+  EXPECT_EQ("42[15]s",
+            fmt::format("{}",
+                        std::chrono::duration<int, std::ratio<15, 1>>(42)));
+  EXPECT_EQ("42[15/4]s",
+            fmt::format("{}",
+                        std::chrono::duration<int, std::ratio<15, 4>>(42)));
+}
+
+TEST(ChronoTest, Align) {
+  auto s = std::chrono::seconds(42);
+  EXPECT_EQ("42s  ", fmt::format("{:5}", s));
+  EXPECT_EQ("42s  ", fmt::format("{:{}}", s, 5));
+  EXPECT_EQ("  42s", fmt::format("{:>5}", s));
+  EXPECT_EQ("**42s**", fmt::format("{:*^7}", s));
+  EXPECT_EQ("03:25:45    ",
+            fmt::format("{:12%H:%M:%S}", std::chrono::seconds(12345)));
+  EXPECT_EQ("    03:25:45",
+            fmt::format("{:>12%H:%M:%S}", std::chrono::seconds(12345)));
+  EXPECT_EQ("~~03:25:45~~",
+            fmt::format("{:~^12%H:%M:%S}", std::chrono::seconds(12345)));
+
+}
+
+TEST(ChronoTest, FormatSpecs) {
+  EXPECT_EQ("%", fmt::format("{:%%}", std::chrono::seconds(0)));
+  EXPECT_EQ("\n", fmt::format("{:%n}", std::chrono::seconds(0)));
+  EXPECT_EQ("\t", fmt::format("{:%t}", std::chrono::seconds(0)));
+  EXPECT_EQ("00", fmt::format("{:%S}", std::chrono::seconds(0)));
+  EXPECT_EQ("00", fmt::format("{:%S}", std::chrono::seconds(60)));
+  EXPECT_EQ("42", fmt::format("{:%S}", std::chrono::seconds(42)));
+  EXPECT_EQ("01.234", fmt::format("{:%S}", std::chrono::milliseconds(1234)));
+  EXPECT_EQ("00", fmt::format("{:%M}", std::chrono::minutes(0)));
+  EXPECT_EQ("00", fmt::format("{:%M}", std::chrono::minutes(60)));
+  EXPECT_EQ("42", fmt::format("{:%M}", std::chrono::minutes(42)));
+  EXPECT_EQ("01", fmt::format("{:%M}", std::chrono::seconds(61)));
+  EXPECT_EQ("00", fmt::format("{:%H}", std::chrono::hours(0)));
+  EXPECT_EQ("00", fmt::format("{:%H}", std::chrono::hours(24)));
+  EXPECT_EQ("14", fmt::format("{:%H}", std::chrono::hours(14)));
+  EXPECT_EQ("01", fmt::format("{:%H}", std::chrono::minutes(61)));
+  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(0)));
+  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(12)));
+  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(24)));
+  EXPECT_EQ("04", fmt::format("{:%I}", std::chrono::hours(4)));
+  EXPECT_EQ("02", fmt::format("{:%I}", std::chrono::hours(14)));
+  EXPECT_EQ("03:25:45",
+            fmt::format("{:%H:%M:%S}", std::chrono::seconds(12345)));
+  EXPECT_EQ("03:25", fmt::format("{:%R}", std::chrono::seconds(12345)));
+  EXPECT_EQ("03:25:45", fmt::format("{:%T}", std::chrono::seconds(12345)));
+}
+
+TEST(ChronoTest, InvalidSpecs) {
+  auto sec = std::chrono::seconds(0);
+  EXPECT_THROW_MSG(fmt::format("{:%a}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%A}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%c}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%x}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%Ex}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%X}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%EX}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%D}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%F}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%Ec}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%w}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%u}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%b}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%B}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%z}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%Z}", sec), fmt::format_error, "no date");
+  EXPECT_THROW_MSG(fmt::format("{:%q}", sec), fmt::format_error,
+                   "invalid format");
+  EXPECT_THROW_MSG(fmt::format("{:%Eq}", sec), fmt::format_error,
+                   "invalid format");
+  EXPECT_THROW_MSG(fmt::format("{:%Oq}", sec), fmt::format_error,
+                   "invalid format");
+}
+
+TEST(ChronoTest, Locale) {
+  const char *loc_name = "ja_JP.utf8";
+  bool has_locale = false;
+  std::locale loc;
+  try {
+    loc = std::locale(loc_name);
+    has_locale = true;
+  } catch (const std::runtime_error &) {}
+  if (!has_locale) {
+    fmt::print("{} locale is missing.\n", loc_name);
+    return;
+  }
+  EXPECT_TIME("%OH", make_hour(14), std::chrono::hours(14));
+  EXPECT_TIME("%OI", make_hour(14), std::chrono::hours(14));
+  EXPECT_TIME("%OM", make_minute(42), std::chrono::minutes(42));
+  EXPECT_TIME("%OS", make_second(42), std::chrono::seconds(42));
+  auto time = make_tm();
+  time.tm_hour = 3;
+  time.tm_min = 25;
+  time.tm_sec = 45;
+  auto sec = std::chrono::seconds(12345);
+  EXPECT_TIME("%r", time, sec);
+  EXPECT_TIME("%p", time, sec);
+}

externals/fmt/test/core-test.cc

@@ -13,6 +13,7 @@
 #include <limits>
 #include <string>
 #include <type_traits>
+#include <memory>
 
 #include "test-assert.h"
 
@@ -64,6 +65,7 @@ struct formatter<test_struct, Char> {
 };
 FMT_END_NAMESPACE
 
+#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 470
 TEST(BufferTest, Noncopyable) {
   EXPECT_FALSE(std::is_copy_constructible<basic_buffer<char> >::value);
 #if !FMT_MSC_VER
@@ -79,11 +81,12 @@ TEST(BufferTest, Nonmoveable) {
   EXPECT_FALSE(std::is_move_assignable<basic_buffer<char> >::value);
 #endif
 }
+#endif
 
 // A test buffer with a dummy grow method.
 template <typename T>
 struct test_buffer : basic_buffer<T> {
-  void grow(std::size_t capacity) { this->set(nullptr, capacity); }
+  void grow(std::size_t capacity) { this->set(FMT_NULL, capacity); }
 };
 
 template <typename T>
@@ -103,7 +106,7 @@ struct mock_buffer : basic_buffer<T> {
 TEST(BufferTest, Ctor) {
   {
     mock_buffer<int> buffer;
-    EXPECT_EQ(nullptr, &buffer[0]);
+    EXPECT_EQ(FMT_NULL, &buffer[0]);
     EXPECT_EQ(static_cast<size_t>(0), buffer.size());
     EXPECT_EQ(static_cast<size_t>(0), buffer.capacity());
   }
@@ -218,14 +221,16 @@ struct custom_context {
 
       const char *format(const T &, custom_context& ctx) {
         ctx.called = true;
-        return nullptr;
+        return FMT_NULL;
       }
     };
   };
 
   bool called;
 
-  fmt::parse_context parse_context() { return fmt::parse_context(""); }
+  fmt::format_parse_context parse_context() {
+    return fmt::format_parse_context("");
+  }
   void advance_to(const char *) {}
 };
 
@@ -364,8 +369,8 @@ TEST(ArgTest, WStringArg) {
 }
 
 TEST(ArgTest, PointerArg) {
-  void *p = nullptr;
-  const void *cp = nullptr;
+  void *p = FMT_NULL;
+  const void *cp = FMT_NULL;
   CHECK_ARG_(char, cp, p);
   CHECK_ARG_(wchar_t, cp, p);
   CHECK_ARG(cp, );
@@ -376,7 +381,7 @@ struct check_custom {
       fmt::basic_format_arg<fmt::format_context>::handle h) const {
     struct test_buffer : fmt::internal::basic_buffer<char> {
       char data[10];
-      test_buffer() : basic_buffer(data, 0, 10) {}
+      test_buffer() : fmt::internal::basic_buffer<char>(data, 0, 10) {}
       void grow(std::size_t) {}
     } buffer;
     fmt::internal::basic_buffer<char> &base = buffer;
@@ -451,6 +456,76 @@ TEST(CoreTest, IsEnumConvertibleToInt) {
   EXPECT_TRUE((fmt::convert_to_int<enum_with_underlying_type, char>::value));
 }
 
+namespace my_ns {
+template <typename Char>
+class my_string {
+ public:
+  my_string(const Char *s) : s_(s) {}
+  const Char * data() const FMT_NOEXCEPT { return s_.data(); }
+  std::size_t length() const FMT_NOEXCEPT { return s_.size(); }
+  operator const Char*() const { return s_.c_str(); }
+ private:
+  std::basic_string<Char> s_;
+};
+
+template <typename Char>
+inline fmt::basic_string_view<Char>
+    to_string_view(const my_string<Char> &s) FMT_NOEXCEPT {
+  return { s.data(), s.length() };
+}
+
+struct non_string {};
+}
+
+namespace FakeQt {
+class QString {
+ public:
+  QString(const wchar_t *s) : s_(std::make_shared<std::wstring>(s)) {}
+  const wchar_t *utf16() const FMT_NOEXCEPT { return s_->data(); }
+  int size() const FMT_NOEXCEPT { return static_cast<int>(s_->size()); }
+#ifdef FMT_STRING_VIEW
+  operator FMT_STRING_VIEW<wchar_t>() const FMT_NOEXCEPT { return *s_; }
+#endif
+ private:
+  std::shared_ptr<std::wstring> s_;
+};
+
+inline fmt::basic_string_view<wchar_t> to_string_view(
+    const QString &s) FMT_NOEXCEPT {
+  return {s.utf16(),
+          static_cast<std::size_t>(s.size())};
+}
+}
+
+template <typename T>
+class IsStringTest : public testing::Test {};
+
+typedef ::testing::Types<char, wchar_t, char16_t, char32_t> StringCharTypes;
+TYPED_TEST_CASE(IsStringTest, StringCharTypes);
+
+namespace {
+template <typename Char>
+struct derived_from_string_view : fmt::basic_string_view<Char> {};
+}
+
+TYPED_TEST(IsStringTest, IsString) {
+  EXPECT_TRUE((fmt::internal::is_string<TypeParam *>::value));
+  EXPECT_TRUE((fmt::internal::is_string<const TypeParam *>::value));
+  EXPECT_TRUE((fmt::internal::is_string<TypeParam[2]>::value));
+  EXPECT_TRUE((fmt::internal::is_string<const TypeParam[2]>::value));
+  EXPECT_TRUE((fmt::internal::is_string<std::basic_string<TypeParam>>::value));
+  EXPECT_TRUE(
+        (fmt::internal::is_string<fmt::basic_string_view<TypeParam>>::value));
+  EXPECT_TRUE(
+        (fmt::internal::is_string<derived_from_string_view<TypeParam>>::value));
+#ifdef FMT_STRING_VIEW
+  EXPECT_TRUE((fmt::internal::is_string<FMT_STRING_VIEW<TypeParam>>::value));
+#endif
+  EXPECT_TRUE((fmt::internal::is_string<my_ns::my_string<TypeParam>>::value));
+  EXPECT_FALSE((fmt::internal::is_string<my_ns::non_string>::value));
+  EXPECT_TRUE((fmt::internal::is_string<FakeQt::QString>::value));
+}
+
 TEST(CoreTest, Format) {
   // This should work without including fmt/format.h.
 #ifdef FMT_FORMAT_H_
@@ -458,3 +533,81 @@ TEST(CoreTest, Format) {
 #endif
   EXPECT_EQ(fmt::format("{}", 42), "42");
 }
+
+TEST(CoreTest, FormatTo) {
+  // This should work without including fmt/format.h.
+#ifdef FMT_FORMAT_H_
+# error fmt/format.h must not be included in the core test
+#endif
+  std::string s;
+  fmt::format_to(std::back_inserter(s), "{}", 42);
+  EXPECT_EQ(s, "42");
+}
+
+TEST(CoreTest, ToStringViewForeignStrings) {
+  using namespace my_ns;
+  using namespace FakeQt;
+  EXPECT_EQ(to_string_view(my_string<char>("42")), "42");
+  EXPECT_EQ(to_string_view(my_string<wchar_t>(L"42")), L"42");
+  EXPECT_EQ(to_string_view(QString(L"42")), L"42");
+  fmt::internal::type type =
+      fmt::internal::get_type<fmt::format_context, my_string<char>>::value;
+  EXPECT_EQ(type, fmt::internal::string_type);
+  type =
+      fmt::internal::get_type<fmt::wformat_context, my_string<wchar_t>>::value;
+  EXPECT_EQ(type, fmt::internal::string_type);
+  type = fmt::internal::get_type<fmt::wformat_context, QString>::value;
+  EXPECT_EQ(type, fmt::internal::string_type);
+  // Does not compile: only wide format contexts are compatible with QString!
+  // type = fmt::internal::get_type<fmt::format_context, QString>::value;
+}
+
+TEST(CoreTest, FormatForeignStrings) {
+  using namespace my_ns;
+  using namespace FakeQt;
+  EXPECT_EQ(fmt::format(my_string<char>("{}"), 42), "42");
+  EXPECT_EQ(fmt::format(my_string<wchar_t>(L"{}"), 42), L"42");
+  EXPECT_EQ(fmt::format(QString(L"{}"), 42), L"42");
+  EXPECT_EQ(fmt::format(QString(L"{}"), my_string<wchar_t>(L"42")), L"42");
+  EXPECT_EQ(fmt::format(my_string<wchar_t>(L"{}"), QString(L"42")), L"42");
+}
+
+struct implicitly_convertible_to_string_view {
+  operator fmt::string_view() const { return "foo"; }
+};
+
+TEST(FormatterTest, FormatImplicitlyConvertibleToStringView) {
+  EXPECT_EQ("foo", fmt::format("{}", implicitly_convertible_to_string_view()));
+}
+
+// std::is_constructible is broken in MSVC until version 2015.
+#if FMT_USE_EXPLICIT && (!FMT_MSC_VER || FMT_MSC_VER >= 1900)
+struct explicitly_convertible_to_string_view {
+  explicit operator fmt::string_view() const { return "foo"; }
+};
+
+TEST(FormatterTest, FormatExplicitlyConvertibleToStringView) {
+  EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_view()));
+}
+
+struct explicitly_convertible_to_wstring_view {
+  explicit operator fmt::wstring_view() const { return L"foo"; }
+};
+
+TEST(FormatterTest, FormatExplicitlyConvertibleToWStringView) {
+  EXPECT_EQ(L"foo",
+            fmt::format(L"{}", explicitly_convertible_to_wstring_view()));
+}
+
+struct explicitly_convertible_to_string_like {
+  template <
+      typename String,
+      typename = typename std::enable_if<
+        std::is_constructible<String, const char*, std::size_t>::value>::type>
+  FMT_EXPLICIT operator String() const { return String("foo", 3u); }
+};
+
+TEST(FormatterTest, FormatExplicitlyConvertibleToStringLike) {
+  EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_like()));
+}
+#endif

externals/fmt/test/custom-formatter-test.cc

@@ -26,8 +26,8 @@ class custom_arg_formatter :
   using base::operator();
 
   iterator operator()(double value) {
-    // Comparing a float to 0.0 is safe
-    if (round(value * pow(10, spec()->precision())) == 0.0)
+    // Comparing a float to 0.0 is safe.
+    if (round(value * pow(10, spec()->precision)) == 0.0)
       value = 0;
     return base::operator()(value);
   }

externals/fmt/test/format-impl-test.cc

@@ -24,6 +24,12 @@
 #undef min
 #undef max
 
+#if FMT_HAS_CPP_ATTRIBUTE(noreturn)
+# define FMT_NORETURN [[noreturn]]
+#else
+# define FMT_NORETURN
+#endif
+
 using fmt::internal::fp;
 
 template <bool is_iec559>
@@ -96,6 +102,11 @@ TEST(FPTest, GetCachedPower) {
   }
 }
 
+TEST(FPTest, Grisu2FormatCompilesWithNonIEEEDouble) {
+  fmt::memory_buffer buf;
+  grisu2_format(4.2f, buf, fmt::core_format_specs());
+}
+
 template <typename T>
 struct ValueExtractor: fmt::internal::function<T> {
   T operator()(T value) {
@@ -118,16 +129,17 @@ TEST(FormatTest, ArgConverter) {
 
 TEST(FormatTest, FormatNegativeNaN) {
   double nan = std::numeric_limits<double>::quiet_NaN();
-  if (fmt::internal::fputil::isnegative(-nan))
+  if (std::signbit(-nan))
     EXPECT_EQ("-nan", fmt::format("{}", -nan));
   else
     fmt::print("Warning: compiler doesn't handle negative NaN correctly");
 }
 
 TEST(FormatTest, StrError) {
-  char *message = nullptr;
+  char *message = FMT_NULL;
   char buffer[BUFFER_SIZE];
-  EXPECT_ASSERT(fmt::safe_strerror(EDOM, message = nullptr, 0), "invalid buffer");
+  EXPECT_ASSERT(fmt::safe_strerror(EDOM, message = FMT_NULL, 0),
+                "invalid buffer");
   EXPECT_ASSERT(fmt::safe_strerror(EDOM, message = buffer, 0),
                 "invalid buffer");
   buffer[0] = 'x';
@@ -140,7 +152,7 @@ TEST(FormatTest, StrError) {
 #endif
 
   int result = fmt::safe_strerror(error_code, message = buffer, BUFFER_SIZE);
-  EXPECT_EQ(0, result);
+  EXPECT_EQ(result, 0);
   std::size_t message_size = std::strlen(message);
   EXPECT_GE(BUFFER_SIZE - 1u, message_size);
   EXPECT_EQ(get_system_error(error_code), message);
@@ -195,8 +207,40 @@ TEST(FormatTest, CountCodePoints) {
 }
 
 TEST(ColorsTest, Colors) {
-  EXPECT_WRITE(stdout, fmt::print(fmt::rgb(255,20,30), "rgb(255,20,30)"),
+  EXPECT_WRITE(stdout, fmt::print(fg(fmt::rgb(255, 20, 30)), "rgb(255,20,30)"),
                "\x1b[38;2;255;020;030mrgb(255,20,30)\x1b[0m");
-  EXPECT_WRITE(stdout, fmt::print(fmt::color::blue, "blue"),
+  EXPECT_WRITE(stdout, fmt::print(fg(fmt::color::blue), "blue"),
                "\x1b[38;2;000;000;255mblue\x1b[0m");
+  EXPECT_WRITE(
+      stdout,
+      fmt::print(fg(fmt::color::blue) | bg(fmt::color::red), "two color"),
+      "\x1b[38;2;000;000;255m\x1b[48;2;255;000;000mtwo color\x1b[0m");
+  EXPECT_WRITE(stdout, fmt::print(fmt::emphasis::bold, "bold"),
+               "\x1b[1mbold\x1b[0m");
+  EXPECT_WRITE(stdout, fmt::print(fmt::emphasis::italic, "italic"),
+               "\x1b[3mitalic\x1b[0m");
+  EXPECT_WRITE(stdout, fmt::print(fmt::emphasis::underline, "underline"),
+               "\x1b[4munderline\x1b[0m");
+  EXPECT_WRITE(stdout,
+               fmt::print(fmt::emphasis::strikethrough, "strikethrough"),
+               "\x1b[9mstrikethrough\x1b[0m");
+  EXPECT_WRITE(
+      stdout,
+      fmt::print(fg(fmt::color::blue) | fmt::emphasis::bold, "blue/bold"),
+      "\x1b[1m\x1b[38;2;000;000;255mblue/bold\x1b[0m");
+  EXPECT_WRITE(stderr, fmt::print(stderr, fmt::emphasis::bold, "bold error"),
+               "\x1b[1mbold error\x1b[0m");
+  EXPECT_WRITE(stderr, fmt::print(stderr, fg(fmt::color::blue), "blue log"),
+                 "\x1b[38;2;000;000;255mblue log\x1b[0m");
+  EXPECT_WRITE(stdout, fmt::print(fmt::text_style(), "hi"), "hi");
+  EXPECT_WRITE(stdout, fmt::print(fg(fmt::terminal_color::red), "tred"),
+               "\x1b[31mtred\x1b[0m");
+  EXPECT_WRITE(stdout, fmt::print(bg(fmt::terminal_color::cyan), "tcyan"),
+               "\x1b[46mtcyan\x1b[0m");
+  EXPECT_WRITE(stdout,
+               fmt::print(fg(fmt::terminal_color::bright_green), "tbgreen"),
+               "\x1b[92mtbgreen\x1b[0m");
+  EXPECT_WRITE(stdout,
+               fmt::print(bg(fmt::terminal_color::bright_magenta), "tbmagenta"),
+               "\x1b[105mtbmagenta\x1b[0m");
 }

externals/fmt/test/format-test.cc

@@ -12,6 +12,7 @@
 #include <cstring>
 #include <list>
 #include <memory>
+#include <string>
 #include <stdint.h>
 
 // Check if fmt/format.h compiles with windows.h included before it.
@@ -44,6 +45,38 @@ using testing::StrictMock;
 
 namespace {
 
+#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 408
+template <typename Char, typename T>
+bool check_enabled_formatter() {
+  static_assert(
+        std::is_default_constructible<fmt::formatter<T, Char>>::value, "");
+  return true;
+}
+
+template <typename Char, typename... T>
+void check_enabled_formatters() {
+  auto dummy = {check_enabled_formatter<Char, T>()...};
+  (void)dummy;
+}
+
+TEST(FormatterTest, TestFormattersEnabled) {
+  check_enabled_formatters<char,
+      bool, char, signed char, unsigned char, short, unsigned short,
+      int, unsigned, long, unsigned long, long long, unsigned long long,
+      float, double, long double, void*, const void*,
+      char*, const char*, std::string>();
+  check_enabled_formatters<wchar_t,
+      bool, wchar_t, signed char, unsigned char, short, unsigned short,
+      int, unsigned, long, unsigned long, long long, unsigned long long,
+      float, double, long double, void*, const void*,
+      wchar_t*, const wchar_t*, std::wstring>();
+#if FMT_USE_NULLPTR
+  check_enabled_formatters<char, std::nullptr_t>();
+  check_enabled_formatters<wchar_t, std::nullptr_t>();
+#endif
+}
+#endif
+
 // Format value using the standard library.
 template <typename Char, typename T>
 void std_format(const T &value, std::basic_string<Char> &result) {
@@ -160,13 +193,16 @@ TEST(UtilTest, ParseNonnegativeInt) {
     fmt::print("Skipping parse_nonnegative_int test\n");
     return;
   }
-  const char *s = "10000000000";
+  fmt::string_view s = "10000000000";
+  auto begin = s.begin(), end = s.end();
   EXPECT_THROW_MSG(
-        parse_nonnegative_int(s, fmt::internal::error_handler()),
+        parse_nonnegative_int(begin, end, fmt::internal::error_handler()),
         fmt::format_error, "number is too big");
   s = "2147483649";
+  begin = s.begin();
+  end = s.end();
   EXPECT_THROW_MSG(
-        parse_nonnegative_int(s, fmt::internal::error_handler()),
+        parse_nonnegative_int(begin, end, fmt::internal::error_handler()),
         fmt::format_error, "number is too big");
 }
 
@@ -185,6 +221,35 @@ TEST(IteratorTest, TruncatingIterator) {
   EXPECT_EQ(it.base(), p + 1);
 }
 
+TEST(IteratorTest, TruncatingBackInserter) {
+  std::string buffer;
+  auto bi = std::back_inserter(buffer);
+  fmt::internal::truncating_iterator<decltype(bi)> it(bi, 2);
+  *it++ = '4';
+  *it++ = '2';
+  *it++ = '1';
+  EXPECT_EQ(buffer.size(), 2);
+  EXPECT_EQ(buffer, "42");
+}
+
+TEST(IteratorTest, IsOutputIterator) {
+  EXPECT_TRUE(fmt::internal::is_output_iterator<char*>::value);
+  EXPECT_FALSE(fmt::internal::is_output_iterator<const char*>::value);
+  EXPECT_FALSE(fmt::internal::is_output_iterator<std::string>::value);
+  EXPECT_TRUE(fmt::internal::is_output_iterator<
+              std::back_insert_iterator<std::string>>::value);
+  EXPECT_TRUE(fmt::internal::is_output_iterator<
+              std::string::iterator>::value);
+  EXPECT_FALSE(fmt::internal::is_output_iterator<
+               std::string::const_iterator>::value);
+  EXPECT_FALSE(fmt::internal::is_output_iterator<std::list<char>>::value);
+  EXPECT_TRUE(fmt::internal::is_output_iterator<
+              std::list<char>::iterator>::value);
+  EXPECT_FALSE(fmt::internal::is_output_iterator<
+               std::list<char>::const_iterator>::value);
+  EXPECT_FALSE(fmt::internal::is_output_iterator<uint32_pair>::value);
+}
+
 TEST(MemoryBufferTest, Ctor) {
   basic_memory_buffer<char, 123> buffer;
   EXPECT_EQ(static_cast<size_t>(0), buffer.size());
@@ -212,7 +277,7 @@ TEST(AllocatorTest, allocator_ref) {
   test_allocator_ref ref2(ref);
   check_forwarding(alloc, ref2);
   test_allocator_ref ref3;
-  EXPECT_EQ(nullptr, ref3.get());
+  EXPECT_EQ(FMT_NULL, ref3.get());
   ref3 = ref;
   check_forwarding(alloc, ref3);
 }
@@ -228,7 +293,7 @@ static void check_move_buffer(const char *str,
   EXPECT_EQ(str, std::string(&buffer2[0], buffer2.size()));
   EXPECT_EQ(5u, buffer2.capacity());
   // Move should transfer allocator.
-  EXPECT_EQ(nullptr, buffer.get_allocator().get());
+  EXPECT_EQ(FMT_NULL, buffer.get_allocator().get());
   EXPECT_EQ(alloc, buffer2.get_allocator().get());
 }
 
@@ -313,7 +378,7 @@ TEST(MemoryBufferTest, Grow) {
 TEST(MemoryBufferTest, Allocator) {
   typedef allocator_ref< mock_allocator<char> > TestAllocator;
   basic_memory_buffer<char, 10, TestAllocator> buffer;
-  EXPECT_EQ(nullptr, buffer.get_allocator().get());
+  EXPECT_EQ(FMT_NULL, buffer.get_allocator().get());
   StrictMock< mock_allocator<char> > alloc;
   char mem;
   {
@@ -351,29 +416,6 @@ TEST(MemoryBufferTest, ExceptionInDeallocate) {
   EXPECT_CALL(alloc, deallocate(&mem2[0], 2 * size));
 }
 
-TEST(FixedBufferTest, Ctor) {
-  char array[10] = "garbage";
-  fmt::basic_fixed_buffer<char> buffer(array, sizeof(array));
-  EXPECT_EQ(static_cast<size_t>(0), buffer.size());
-  EXPECT_EQ(10u, buffer.capacity());
-  EXPECT_EQ(array, buffer.data());
-}
-
-TEST(FixedBufferTest, CompileTimeSizeCtor) {
-  char array[10] = "garbage";
-  fmt::basic_fixed_buffer<char> buffer(array);
-  EXPECT_EQ(static_cast<size_t>(0), buffer.size());
-  EXPECT_EQ(10u, buffer.capacity());
-  EXPECT_EQ(array, buffer.data());
-}
-
-TEST(FixedBufferTest, BufferOverflow) {
-  char array[10];
-  fmt::basic_fixed_buffer<char> buffer(array);
-  buffer.resize(10);
-  EXPECT_THROW_MSG(buffer.resize(11), std::runtime_error, "buffer overflow");
-}
-
 #ifdef _WIN32
 TEST(UtilTest, UTF16ToUTF8) {
   std::string s = "ёжик";
@@ -476,7 +518,7 @@ TEST(UtilTest, FormatSystemError) {
     fmt::print("warning: std::allocator allocates {} chars", max_size);
     return;
   }
-  fmt::format_system_error(message, EDOM, fmt::string_view(nullptr, max_size));
+  fmt::format_system_error(message, EDOM, fmt::string_view(FMT_NULL, max_size));
   EXPECT_EQ(fmt::format("error {}", EDOM), to_string(message));
 }
 
@@ -564,17 +606,6 @@ TEST(StringViewTest, Ctor) {
   EXPECT_EQ(4u, string_view(std::string("defg")).size());
 }
 
-// GCC 4.6 doesn't have std::is_copy_*.
-#if FMT_GCC_VERSION && FMT_GCC_VERSION >= 407
-TEST(WriterTest, NotCopyConstructible) {
-  EXPECT_FALSE(std::is_copy_constructible<fmt::writer>::value);
-}
-
-TEST(WriterTest, NotCopyAssignable) {
-  EXPECT_FALSE(std::is_copy_assignable<fmt::writer>::value);
-}
-#endif
-
 TEST(WriterTest, Data) {
   memory_buffer buf;
   fmt::writer w(buf);
@@ -682,9 +713,15 @@ TEST(FormatToTest, Format) {
   EXPECT_EQ("part1part2", s);
 }
 
+TEST(FormatToTest, WideString) {
+  std::vector<wchar_t> buf;
+  fmt::format_to(std::back_inserter(buf), L"{}{}", 42, L'\0');
+  EXPECT_STREQ(buf.data(), L"42");
+}
+
 TEST(FormatToTest, FormatToNonbackInsertIteratorWithSignAndNumericAlignment) {
   char buffer[16] = {};
-  fmt::format_to(buffer, "{: =+}", 42.0);
+  fmt::format_to(fmt::internal::make_checked(buffer, 16), "{: =+}", 42.0);
   EXPECT_STREQ("+42", buffer);
 }
 
@@ -737,6 +774,7 @@ TEST(FormatterTest, ArgErrors) {
   EXPECT_THROW_MSG(format("{?}"), format_error, "invalid format string");
   EXPECT_THROW_MSG(format("{0"), format_error, "invalid format string");
   EXPECT_THROW_MSG(format("{0}"), format_error, "argument index out of range");
+  EXPECT_THROW_MSG(format("{00}", 42), format_error, "invalid format string");
 
   char format_str[BUFFER_SIZE];
   safe_sprintf(format_str, "{%u", INT_MAX);
@@ -754,7 +792,7 @@ TEST(FormatterTest, ArgErrors) {
 template <int N>
 struct TestFormat {
   template <typename... Args>
-  static std::string format(fmt::string_view format_str, const Args & ... args) {
+  static std::string format(fmt::string_view format_str, const Args &... args) {
     return TestFormat<N - 1>::format(format_str, N - 1, args...);
   }
 };
@@ -762,7 +800,7 @@ struct TestFormat {
 template <>
 struct TestFormat<0> {
   template <typename... Args>
-  static std::string format(fmt::string_view format_str, const Args & ... args) {
+  static std::string format(fmt::string_view format_str, const Args &... args) {
     return fmt::format(format_str, args...);
   }
 };
@@ -906,6 +944,7 @@ TEST(FormatterTest, Fill) {
   EXPECT_EQ("abc**", format("{0:*<5}", "abc"));
   EXPECT_EQ("**0xface", format("{0:*>8}", reinterpret_cast<void*>(0xface)));
   EXPECT_EQ("foo=", format("{:}=", "foo"));
+  EXPECT_EQ(std::string("\0\0\0*", 4), format(string_view("{:\0>4}", 6), '*'));
 }
 
 TEST(FormatterTest, PlusSign) {
@@ -1013,7 +1052,7 @@ TEST(FormatterTest, HashFlag) {
   EXPECT_EQ("0x42", format("{0:#x}", 0x42ull));
   EXPECT_EQ("042", format("{0:#o}", 042ull));
 
-  if (fmt::internal::use_grisu())
+  if (FMT_USE_GRISU)
     EXPECT_EQ("-42.0", format("{0:#}", -42.0));
   else
     EXPECT_EQ("-42.0000", format("{0:#}", -42.0));
@@ -1395,6 +1434,8 @@ TEST(FormatterTest, FormatIntLocale) {
   EXPECT_EQ("123", format("{:n}", 123));
   EXPECT_EQ("1,234", format("{:n}", 1234));
   EXPECT_EQ("1,234,567", format("{:n}", 1234567));
+  EXPECT_EQ("4,294,967,295",
+            format("{:n}", std::numeric_limits<uint32_t>::max()));
 }
 
 struct ConvertibleToLongLong {
@@ -1411,13 +1452,14 @@ TEST(FormatterTest, FormatFloat) {
 
 TEST(FormatterTest, FormatDouble) {
   check_unknown_types(1.2, "eEfFgGaA", "double");
-  EXPECT_EQ("0", format("{0:}", 0.0));
-  EXPECT_EQ("0.000000", format("{0:f}", 0.0));
-  EXPECT_EQ("392.65", format("{0:}", 392.65));
-  EXPECT_EQ("392.65", format("{0:g}", 392.65));
-  EXPECT_EQ("392.65", format("{0:G}", 392.65));
-  EXPECT_EQ("392.650000", format("{0:f}", 392.65));
-  EXPECT_EQ("392.650000", format("{0:F}", 392.65));
+  EXPECT_EQ("0", format("{:}", 0.0));
+  EXPECT_EQ("0.000000", format("{:f}", 0.0));
+  EXPECT_EQ("0", format("{:g}", 0.0));
+  EXPECT_EQ("392.65", format("{:}", 392.65));
+  EXPECT_EQ("392.65", format("{:g}", 392.65));
+  EXPECT_EQ("392.65", format("{:G}", 392.65));
+  EXPECT_EQ("392.650000", format("{:f}", 392.65));
+  EXPECT_EQ("392.650000", format("{:F}", 392.65));
   char buffer[BUFFER_SIZE];
   safe_sprintf(buffer, "%e", 392.65);
   EXPECT_EQ(buffer, format("{0:e}", 392.65));
@@ -1430,6 +1472,12 @@ TEST(FormatterTest, FormatDouble) {
   EXPECT_EQ(buffer, format("{:A}", -42.0));
 }
 
+TEST(FormatterTest, FormatDoubleBigPrecision) {
+  // sprintf with big precision is broken in MSVC2013, so only test on Grisu.
+  if (FMT_USE_GRISU)
+    EXPECT_EQ(format("0.{:0<1000}", ""), format("{:.1000f}", 0.0));
+}
+
 TEST(FormatterTest, FormatNaN) {
   double nan = std::numeric_limits<double>::quiet_NaN();
   EXPECT_EQ("nan", format("{}", nan));
@@ -1498,7 +1546,7 @@ TEST(FormatterTest, FormatCString) {
   EXPECT_EQ("test", format("{0:s}", "test"));
   char nonconst[] = "nonconst";
   EXPECT_EQ("nonconst", format("{0}", nonconst));
-  EXPECT_THROW_MSG(format("{0}", static_cast<const char*>(nullptr)),
+  EXPECT_THROW_MSG(format("{0}", static_cast<const char*>(FMT_NULL)),
       format_error, "string pointer is null");
 }
 
@@ -1520,7 +1568,7 @@ TEST(FormatterTest, FormatUCharString) {
 
 TEST(FormatterTest, FormatPointer) {
   check_unknown_types(reinterpret_cast<void*>(0x1234), "p", "pointer");
-  EXPECT_EQ("0x0", format("{0}", static_cast<void*>(nullptr)));
+  EXPECT_EQ("0x0", format("{0}", static_cast<void*>(FMT_NULL)));
   EXPECT_EQ("0x1234", format("{0}", reinterpret_cast<void*>(0x1234)));
   EXPECT_EQ("0x1234", format("{0:p}", reinterpret_cast<void*>(0x1234)));
   EXPECT_EQ("0x" + std::string(sizeof(void*) * CHAR_BIT / 4, 'f'),
@@ -1546,45 +1594,6 @@ TEST(FormatterTest, FormatStdStringView) {
 }
 #endif
 
-struct implicitly_convertible_to_string_view {
-  operator fmt::string_view() const { return "foo"; }
-};
-
-TEST(FormatterTest, FormatImplicitlyConvertibleToStringView) {
-  EXPECT_EQ("foo", format("{}", implicitly_convertible_to_string_view()));
-}
-
-// std::is_constructible is broken in MSVC until version 2015.
-#if !FMT_MSC_VER || FMT_MSC_VER >= 1900
-struct explicitly_convertible_to_string_view {
-  explicit operator fmt::string_view() const { return "foo"; }
-};
-
-TEST(FormatterTest, FormatExplicitlyConvertibleToStringView) {
-  EXPECT_EQ("foo", format("{}", explicitly_convertible_to_string_view()));
-}
-
-struct explicitly_convertible_to_wstring_view {
-  explicit operator fmt::wstring_view() const { return L"foo"; }
-};
-
-TEST(FormatterTest, FormatExplicitlyConvertibleToWStringView) {
-  EXPECT_EQ(L"foo", format(L"{}", explicitly_convertible_to_wstring_view()));
-}
-
-struct explicitly_convertible_to_string_like {
-  template <
-      typename String,
-      typename = typename std::enable_if<
-        std::is_constructible<String, const char*, std::size_t>::value>::type>
-  explicit operator String() const { return String("foo", 3u); }
-};
-
-TEST(FormatterTest, FormatExplicitlyConvertibleToStringLike) {
-  EXPECT_EQ("foo", format("{}", explicitly_convertible_to_string_like()));
-}
-#endif
-
 FMT_BEGIN_NAMESPACE
 template <>
 struct formatter<Date> {
@@ -1628,7 +1637,8 @@ TEST(FormatterTest, CustomFormat) {
 
 TEST(FormatterTest, CustomFormatTo) {
   char buf[10] = {};
-  auto end = fmt::format_to(buf, "{}", Answer());
+  auto end = &*fmt::format_to(
+        fmt::internal::make_checked(buf, 10), "{}", Answer());
   EXPECT_EQ(end, buf + 2);
   EXPECT_STREQ(buf, "42");
 }
@@ -1661,7 +1671,7 @@ TEST(FormatterTest, FormatExamples) {
   FILE *ftest = safe_fopen(filename, "r");
   if (ftest) fclose(ftest);
   int error_code = errno;
-  EXPECT_TRUE(ftest == nullptr);
+  EXPECT_TRUE(ftest == FMT_NULL);
   EXPECT_SYSTEM_ERROR({
     FILE *f = safe_fopen(filename, "r");
     if (!f)
@@ -1778,7 +1788,7 @@ TEST(FormatTest, Variadic) {
 }
 
 TEST(FormatTest, Dynamic) {
-  using ctx = fmt::format_context;
+  typedef fmt::format_context ctx;
   std::vector<fmt::basic_format_arg<ctx>> args;
   args.emplace_back(fmt::internal::make_arg<ctx>(42));
   args.emplace_back(fmt::internal::make_arg<ctx>("abc1"));
@@ -1830,7 +1840,7 @@ TEST(StrTest, Convert) {
   EXPECT_EQ("2012-12-9", s);
 }
 
-static std::string vformat_message(int id, const char *format, fmt::format_args args) {
+std::string vformat_message(int id, const char *format, fmt::format_args args) {
   fmt::memory_buffer buffer;
   format_to(buffer, "[{}] ", id);
   vformat_to(buffer, format, args);
@@ -1895,6 +1905,7 @@ TEST(FormatTest, UdlTemplate) {
   EXPECT_EQ("foo", "foo"_format());
   EXPECT_EQ("        42", "{0:10}"_format(42));
   EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), 42));
+  EXPECT_EQ(L"42", fmt::format(FMT_STRING(L"{}"), 42));
 }
 #endif // FMT_USE_USER_DEFINED_LITERALS
 
@@ -1906,6 +1917,7 @@ TEST(FormatTest, Enum) {
 
 TEST(FormatTest, EnumFormatterUnambiguous) {
   fmt::formatter<TestEnum> f;
+  ASSERT_GE(sizeof(f), 0); // use f to avoid compiler warning
 }
 
 #if FMT_HAS_FEATURE(cxx_strong_enums)
@@ -1930,7 +1942,7 @@ class mock_arg_formatter:
   typedef buffer_range range;
 
   mock_arg_formatter(fmt::format_context &ctx, fmt::format_specs *s = FMT_NULL)
-    : base(fmt::internal::get_container(ctx.out()), s) {
+    : base(fmt::internal::get_container(ctx.out()), s, ctx.locale()) {
     EXPECT_CALL(*this, call(42));
   }
 
@@ -2080,9 +2092,10 @@ struct test_arg_id_handler {
   FMT_CONSTEXPR void on_error(const char *) { res = ERROR; }
 };
 
-FMT_CONSTEXPR test_arg_id_handler parse_arg_id(const char* s) {
+template <size_t N>
+FMT_CONSTEXPR test_arg_id_handler parse_arg_id(const char (&s)[N]) {
   test_arg_id_handler h;
-  fmt::internal::parse_arg_id(s, h);
+  fmt::internal::parse_arg_id(s, s + N, h);
   return h;
 }
 
@@ -2142,9 +2155,10 @@ struct test_format_specs_handler {
   FMT_CONSTEXPR void on_error(const char *) { res = ERROR; }
 };
 
-FMT_CONSTEXPR test_format_specs_handler parse_test_specs(const char *s) {
+template <size_t N>
+FMT_CONSTEXPR test_format_specs_handler parse_test_specs(const char (&s)[N]) {
   test_format_specs_handler h;
-  fmt::internal::parse_format_specs(s, h);
+  fmt::internal::parse_format_specs(s, s + N, h);
   return h;
 }
 
@@ -2188,61 +2202,64 @@ struct test_context {
   FMT_CONSTEXPR test_context error_handler() { return *this; }
 };
 
-FMT_CONSTEXPR fmt::format_specs parse_specs(const char *s) {
+template <size_t N>
+FMT_CONSTEXPR fmt::format_specs parse_specs(const char (&s)[N]) {
   fmt::format_specs specs;
   test_context ctx{};
   fmt::internal::specs_handler<test_context> h(specs, ctx);
-  parse_format_specs(s, h);
+  parse_format_specs(s, s + N, h);
   return specs;
 }
 
 TEST(FormatTest, ConstexprSpecsHandler) {
   static_assert(parse_specs("<").align() == fmt::ALIGN_LEFT, "");
   static_assert(parse_specs("*^").fill() == '*', "");
-  static_assert(parse_specs("+").flag(fmt::PLUS_FLAG), "");
-  static_assert(parse_specs("-").flag(fmt::MINUS_FLAG), "");
-  static_assert(parse_specs(" ").flag(fmt::SIGN_FLAG), "");
-  static_assert(parse_specs("#").flag(fmt::HASH_FLAG), "");
+  static_assert(parse_specs("+").has(fmt::PLUS_FLAG), "");
+  static_assert(parse_specs("-").has(fmt::MINUS_FLAG), "");
+  static_assert(parse_specs(" ").has(fmt::SIGN_FLAG), "");
+  static_assert(parse_specs("#").has(fmt::HASH_FLAG), "");
   static_assert(parse_specs("0").align() == fmt::ALIGN_NUMERIC, "");
   static_assert(parse_specs("42").width() == 42, "");
   static_assert(parse_specs("{}").width() == 11, "");
   static_assert(parse_specs("{0}").width() == 22, "");
-  static_assert(parse_specs(".42").precision() == 42, "");
-  static_assert(parse_specs(".{}").precision() == 11, "");
-  static_assert(parse_specs(".{0}").precision() == 22, "");
-  static_assert(parse_specs("d").type() == 'd', "");
+  static_assert(parse_specs(".42").precision == 42, "");
+  static_assert(parse_specs(".{}").precision == 11, "");
+  static_assert(parse_specs(".{0}").precision == 22, "");
+  static_assert(parse_specs("d").type == 'd', "");
 }
 
+template <size_t N>
 FMT_CONSTEXPR fmt::internal::dynamic_format_specs<char>
-    parse_dynamic_specs(const char *s) {
+    parse_dynamic_specs(const char (&s)[N]) {
   fmt::internal::dynamic_format_specs<char> specs;
   test_context ctx{};
   fmt::internal::dynamic_specs_handler<test_context> h(specs, ctx);
-  parse_format_specs(s, h);
+  parse_format_specs(s, s + N, h);
   return specs;
 }
 
 TEST(FormatTest, ConstexprDynamicSpecsHandler) {
   static_assert(parse_dynamic_specs("<").align() == fmt::ALIGN_LEFT, "");
   static_assert(parse_dynamic_specs("*^").fill() == '*', "");
-  static_assert(parse_dynamic_specs("+").flag(fmt::PLUS_FLAG), "");
-  static_assert(parse_dynamic_specs("-").flag(fmt::MINUS_FLAG), "");
-  static_assert(parse_dynamic_specs(" ").flag(fmt::SIGN_FLAG), "");
-  static_assert(parse_dynamic_specs("#").flag(fmt::HASH_FLAG), "");
+  static_assert(parse_dynamic_specs("+").has(fmt::PLUS_FLAG), "");
+  static_assert(parse_dynamic_specs("-").has(fmt::MINUS_FLAG), "");
+  static_assert(parse_dynamic_specs(" ").has(fmt::SIGN_FLAG), "");
+  static_assert(parse_dynamic_specs("#").has(fmt::HASH_FLAG), "");
   static_assert(parse_dynamic_specs("0").align() == fmt::ALIGN_NUMERIC, "");
   static_assert(parse_dynamic_specs("42").width() == 42, "");
   static_assert(parse_dynamic_specs("{}").width_ref.index == 33, "");
   static_assert(parse_dynamic_specs("{42}").width_ref.index == 42, "");
-  static_assert(parse_dynamic_specs(".42").precision() == 42, "");
+  static_assert(parse_dynamic_specs(".42").precision == 42, "");
   static_assert(parse_dynamic_specs(".{}").precision_ref.index == 33, "");
   static_assert(parse_dynamic_specs(".{42}").precision_ref.index == 42, "");
-  static_assert(parse_dynamic_specs("d").type() == 'd', "");
+  static_assert(parse_dynamic_specs("d").type == 'd', "");
 }
 
-FMT_CONSTEXPR test_format_specs_handler check_specs(const char *s) {
+template <size_t N>
+FMT_CONSTEXPR test_format_specs_handler check_specs(const char (&s)[N]) {
   fmt::internal::specs_checker<test_format_specs_handler>
       checker(test_format_specs_handler(), fmt::internal::double_type);
-  parse_format_specs(s, checker);
+  parse_format_specs(s, s + N, checker);
   return checker;
 }
 
@@ -2271,20 +2288,21 @@ struct test_format_string_handler {
   template <typename T>
   FMT_CONSTEXPR void on_arg_id(T) {}
 
-  template <typename Iterator>
-  FMT_CONSTEXPR void on_replacement_field(Iterator) {}
+  FMT_CONSTEXPR void on_replacement_field(const char *) {}
 
-  template <typename Iterator>
-  FMT_CONSTEXPR Iterator on_format_specs(Iterator it) { return it; }
+  FMT_CONSTEXPR const char *on_format_specs(const char *begin, const char*) {
+    return begin;
+  }
 
   FMT_CONSTEXPR void on_error(const char *) { error = true; }
 
   bool error = false;
 };
 
-FMT_CONSTEXPR bool parse_string(fmt::string_view s) {
+template <size_t N>
+FMT_CONSTEXPR bool parse_string(const char (&s)[N]) {
   test_format_string_handler h;
-  fmt::internal::parse_format_string<true>(s, h);
+  fmt::internal::parse_format_string<true>(fmt::string_view(s, N - 1), h);
   return !h.error;
 }
 
@@ -2330,8 +2348,8 @@ FMT_CONSTEXPR bool equal(const char *s1, const char *s2) {
 
 template <typename... Args>
 FMT_CONSTEXPR bool test_error(const char *fmt, const char *expected_error) {
-  const char *actual_error = nullptr;
-  fmt::internal::check_format_string<char, test_error_handler, Args...>(
+  const char *actual_error = FMT_NULL;
+  fmt::internal::do_check_format_string<char, test_error_handler, Args...>(
         string_view(fmt, len(fmt)), test_error_handler(actual_error));
   return equal(actual_error, expected_error);
 }
@@ -2342,7 +2360,7 @@ FMT_CONSTEXPR bool test_error(const char *fmt, const char *expected_error) {
   static_assert(test_error<__VA_ARGS__>(fmt, error), "")
 
 TEST(FormatTest, FormatStringErrors) {
-  EXPECT_ERROR_NOARGS("foo", nullptr);
+  EXPECT_ERROR_NOARGS("foo", FMT_NULL);
   EXPECT_ERROR_NOARGS("}", "unmatched '}' in format string");
   EXPECT_ERROR("{0:s", "unknown format specifier", Date);
 #ifndef _MSC_VER
@@ -2395,23 +2413,46 @@ TEST(FormatTest, FormatStringErrors) {
                "cannot switch from automatic to manual argument indexing",
                int, int);
 }
+
+TEST(FormatTest, VFormatTo) {
+  typedef fmt::format_context context;
+  fmt::basic_format_arg<context> arg = fmt::internal::make_arg<context>(42);
+  fmt::basic_format_args<context> args(&arg, 1);
+  std::string s;
+  fmt::vformat_to(std::back_inserter(s), "{}", args);
+  EXPECT_EQ("42", s);
+  s.clear();
+  fmt::vformat_to(std::back_inserter(s), FMT_STRING("{}"), args);
+  EXPECT_EQ("42", s);
+
+  typedef fmt::wformat_context wcontext;
+  fmt::basic_format_arg<wcontext> warg = fmt::internal::make_arg<wcontext>(42);
+  fmt::basic_format_args<wcontext> wargs(&warg, 1);
+  std::wstring w;
+  fmt::vformat_to(std::back_inserter(w), L"{}", wargs);
+  EXPECT_EQ(L"42", w);
+  w.clear();
+  fmt::vformat_to(std::back_inserter(w), FMT_STRING(L"{}"), wargs);
+  EXPECT_EQ(L"42", w);
+}
+
 #endif  // FMT_USE_CONSTEXPR
 
 TEST(FormatTest, ConstructU8StringViewFromCString) {
   fmt::u8string_view s("ab");
   EXPECT_EQ(s.size(), 2u);
   const fmt::char8_t *data = s.data();
-  EXPECT_EQ(data[0].value, 'a');
-  EXPECT_EQ(data[1].value, 'b');
+  EXPECT_EQ(data[0], 'a');
+  EXPECT_EQ(data[1], 'b');
 }
 
 TEST(FormatTest, ConstructU8StringViewFromDataAndSize) {
   fmt::u8string_view s("foobar", 3);
   EXPECT_EQ(s.size(), 3u);
   const fmt::char8_t *data = s.data();
-  EXPECT_EQ(data[0].value, 'f');
-  EXPECT_EQ(data[1].value, 'o');
-  EXPECT_EQ(data[2].value, 'o');
+  EXPECT_EQ(data[0], 'f');
+  EXPECT_EQ(data[1], 'o');
+  EXPECT_EQ(data[2], 'o');
 }
 
 #if FMT_USE_USER_DEFINED_LITERALS
@@ -2420,7 +2461,12 @@ TEST(FormatTest, U8StringViewLiteral) {
   fmt::u8string_view s = "ab"_u;
   EXPECT_EQ(s.size(), 2u);
   const fmt::char8_t *data = s.data();
-  EXPECT_EQ(data[0].value, 'a');
-  EXPECT_EQ(data[1].value, 'b');
+  EXPECT_EQ(data[0], 'a');
+  EXPECT_EQ(data[1], 'b');
+  EXPECT_EQ(format("{:*^5}"_u, "🤡"_u), "**🤡**"_u);
 }
 #endif
+
+TEST(FormatTest, FormatU8String) {
+  EXPECT_EQ(format(fmt::u8string_view("{}"), 42), fmt::u8string_view("42"));
+}

externals/fmt/test/gtest-extra-test.cc

@@ -311,8 +311,8 @@ using fmt::error_code;
 using fmt::file;
 
 TEST(ErrorCodeTest, Ctor) {
-  EXPECT_EQ(0, error_code().get());
-  EXPECT_EQ(42, error_code(42).get());
+  EXPECT_EQ(error_code().get(), 0);
+  EXPECT_EQ(error_code(42).get(), 42);
 }
 
 TEST(OutputRedirectTest, ScopedRedirect) {
@@ -340,10 +340,10 @@ TEST(OutputRedirectTest, FlushErrorInCtor) {
   // Put a character in a file buffer.
   EXPECT_EQ('x', fputc('x', f.get()));
   FMT_POSIX(close(write_fd));
-  scoped_ptr<OutputRedirect> redir{nullptr};
+  scoped_ptr<OutputRedirect> redir{FMT_NULL};
   EXPECT_SYSTEM_ERROR_NOASSERT(redir.reset(new OutputRedirect(f.get())),
       EBADF, "cannot flush stream");
-  redir.reset(nullptr);
+  redir.reset(FMT_NULL);
   write_copy.dup2(write_fd);  // "undo" close or dtor will fail
 }
 
@@ -352,7 +352,7 @@ TEST(OutputRedirectTest, DupErrorInCtor) {
   int fd = (f.fileno)();
   file copy = file::dup(fd);
   FMT_POSIX(close(fd));
-  scoped_ptr<OutputRedirect> redir{nullptr};
+  scoped_ptr<OutputRedirect> redir{FMT_NULL};
   EXPECT_SYSTEM_ERROR_NOASSERT(redir.reset(new OutputRedirect(f.get())),
       EBADF, fmt::format("cannot duplicate file descriptor {}", fd));
   copy.dup2(fd);  // "undo" close or dtor will fail
@@ -403,7 +403,7 @@ TEST(OutputRedirectTest, ErrorInDtor) {
       // output in EXPECT_STDERR and the second close will break output
       // redirection.
       FMT_POSIX(close(write_fd));
-      SUPPRESS_ASSERT(redir.reset(nullptr));
+      SUPPRESS_ASSERT(redir.reset(FMT_NULL));
   }, format_system_error(EBADF, "cannot flush stream"));
   write_copy.dup2(write_fd); // "undo" close or dtor of buffered_file will fail
 }

externals/fmt/test/gtest-extra.h

@@ -155,7 +155,7 @@ std::string read(fmt::file &f, std::size_t count);
 template <typename Mock>
 struct ScopedMock : testing::StrictMock<Mock> {
   ScopedMock() { Mock::instance = this; }
-  ~ScopedMock() { Mock::instance = nullptr; }
+  ~ScopedMock() { Mock::instance = FMT_NULL; }
 };
 
 #endif  // FMT_GTEST_EXTRA_H_

externals/fmt/test/locale-test.cc

@@ -0,0 +1,34 @@
+// Formatting library for C++ - locale tests
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include "fmt/locale.h"
+#include "gmock.h"
+
+template <typename Char>
+struct numpunct : std::numpunct<Char> {
+ protected:
+  Char do_thousands_sep() const FMT_OVERRIDE { return '~'; }
+};
+
+TEST(LocaleTest, Format) {
+  std::locale loc(std::locale(), new numpunct<char>());
+  EXPECT_EQ("1,234,567", fmt::format(std::locale(), "{:n}", 1234567));
+  EXPECT_EQ("1~234~567", fmt::format(loc, "{:n}", 1234567));
+  fmt::format_arg_store<fmt::format_context, int> as{1234567};
+  EXPECT_EQ("1~234~567", fmt::vformat(loc, "{:n}", fmt::format_args(as)));
+  std::string s;
+  fmt::format_to(std::back_inserter(s), loc, "{:n}", 1234567);
+  EXPECT_EQ("1~234~567", s);
+}
+
+TEST(LocaleTest, WFormat) {
+  std::locale loc(std::locale(), new numpunct<wchar_t>());
+  EXPECT_EQ(L"1,234,567", fmt::format(std::locale(), L"{:n}", 1234567));
+  EXPECT_EQ(L"1~234~567", fmt::format(loc, L"{:n}", 1234567));
+  fmt::format_arg_store<fmt::wformat_context, int> as{1234567};
+  EXPECT_EQ(L"1~234~567", fmt::vformat(loc, L"{:n}", fmt::wformat_args(as)));
+}

externals/fmt/test/mock-allocator.h

@@ -28,13 +28,13 @@ class allocator_ref {
 
   void move(allocator_ref &other) {
     alloc_ = other.alloc_;
-    other.alloc_ = nullptr;
+    other.alloc_ = FMT_NULL;
   }
 
  public:
   typedef typename Allocator::value_type value_type;
 
-  explicit allocator_ref(Allocator *alloc = nullptr) : alloc_(alloc) {}
+  explicit allocator_ref(Allocator *alloc = FMT_NULL) : alloc_(alloc) {}
 
   allocator_ref(const allocator_ref &other) : alloc_(other.alloc_) {}
   allocator_ref(allocator_ref &&other) { move(other); }

externals/fmt/test/ostream-test.cc

@@ -146,12 +146,11 @@ TEST(OStreamTest, WriteToOStreamMaxSize) {
   } os(streambuf);
 
   testing::InSequence sequence;
-  const char *data = nullptr;
-  std::size_t size = max_size;
-  do {
+  const char *data = FMT_NULL;
   typedef std::make_unsigned<std::streamsize>::type ustreamsize;
-    ustreamsize n = std::min<ustreamsize>(
-          size, fmt::internal::to_unsigned(max_streamsize));
+  ustreamsize size = max_size;
+  do {
+    auto n = std::min(size, fmt::internal::to_unsigned(max_streamsize));
     EXPECT_CALL(streambuf, xsputn(data, static_cast<std::streamsize>(n)))
         .WillOnce(testing::Return(max_streamsize));
     data += n;

externals/fmt/test/posix-mock-test.cc

@@ -133,7 +133,7 @@ int test::dup2(int fildes, int fildes2) {
 }
 
 FILE *test::fdopen(int fildes, const char *mode) {
-  EMULATE_EINTR(fdopen, nullptr);
+  EMULATE_EINTR(fdopen, FMT_NULL);
   return ::FMT_POSIX(fdopen(fildes, mode));
 }
 
@@ -162,7 +162,7 @@ int test::pipe(int *pfds, unsigned psize, int textmode) {
 #endif
 
 FILE *test::fopen(const char *filename, const char *mode) {
-  EMULATE_EINTR(fopen, nullptr);
+  EMULATE_EINTR(fopen, FMT_NULL);
   return ::fopen(filename, mode);
 }
 
@@ -216,7 +216,7 @@ TEST(UtilTest, GetPageSize) {
 
 TEST(FileTest, OpenRetry) {
   write_file("test", "there must be something here");
-  scoped_ptr<file> f{nullptr};
+  scoped_ptr<file> f{FMT_NULL};
   EXPECT_RETRY(f.reset(new file("test", file::RDONLY)),
                open, "cannot open file test");
 #ifndef _WIN32
@@ -232,7 +232,7 @@ TEST(FileTest, CloseNoRetryInDtor) {
   int saved_close_count = 0;
   EXPECT_WRITE(stderr, {
     close_count = 1;
-    f.reset(nullptr);
+    f.reset(FMT_NULL);
     saved_close_count = close_count;
     close_count = 0;
   }, format_system_error(EINTR, "cannot close file") + "\n");
@@ -385,7 +385,7 @@ TEST(FileTest, FdopenNoRetry) {
 
 TEST(BufferedFileTest, OpenRetry) {
   write_file("test", "there must be something here");
-  scoped_ptr<buffered_file> f{nullptr};
+  scoped_ptr<buffered_file> f{FMT_NULL};
   EXPECT_RETRY(f.reset(new buffered_file("test", "r")),
                fopen, "cannot open file test");
 #ifndef _WIN32
@@ -402,7 +402,7 @@ TEST(BufferedFileTest, CloseNoRetryInDtor) {
   int saved_fclose_count = 0;
   EXPECT_WRITE(stderr, {
     fclose_count = 1;
-    f.reset(nullptr);
+    f.reset(FMT_NULL);
     saved_fclose_count = fclose_count;
     fclose_count = 0;
   }, format_system_error(EINTR, "cannot close file") + "\n");
@@ -440,7 +440,7 @@ TEST(ScopedMock, Scope) {
     TestMock &copy = mock;
     static_cast<void>(copy);
   }
-  EXPECT_EQ(nullptr, TestMock::instance);
+  EXPECT_EQ(FMT_NULL, TestMock::instance);
 }
 
 #ifdef FMT_LOCALE
@@ -515,7 +515,7 @@ TEST(LocaleTest, Locale) {
 #endif
   ScopedMock<LocaleMock> mock;
   LocaleType impl = reinterpret_cast<LocaleType>(42);
-  EXPECT_CALL(mock, newlocale(LC_NUMERIC_MASK, StrEq("C"), nullptr))
+  EXPECT_CALL(mock, newlocale(LC_NUMERIC_MASK, StrEq("C"), FMT_NULL))
       .WillOnce(Return(impl));
   EXPECT_CALL(mock, freelocale(impl));
   fmt::Locale locale;

externals/fmt/test/posix-test.cc

@@ -59,26 +59,26 @@ static void write(file &f, fmt::string_view s) {
 
 TEST(BufferedFileTest, DefaultCtor) {
   buffered_file f;
-  EXPECT_TRUE(f.get() == nullptr);
+  EXPECT_TRUE(f.get() == FMT_NULL);
 }
 
 TEST(BufferedFileTest, MoveCtor) {
   buffered_file bf = open_buffered_file();
   FILE *fp = bf.get();
-  EXPECT_TRUE(fp != nullptr);
+  EXPECT_TRUE(fp != FMT_NULL);
   buffered_file bf2(std::move(bf));
   EXPECT_EQ(fp, bf2.get());
-  EXPECT_TRUE(bf.get() == nullptr);
+  EXPECT_TRUE(bf.get() == FMT_NULL);
 }
 
 TEST(BufferedFileTest, MoveAssignment) {
   buffered_file bf = open_buffered_file();
   FILE *fp = bf.get();
-  EXPECT_TRUE(fp != nullptr);
+  EXPECT_TRUE(fp != FMT_NULL);
   buffered_file bf2;
   bf2 = std::move(bf);
   EXPECT_EQ(fp, bf2.get());
-  EXPECT_TRUE(bf.get() == nullptr);
+  EXPECT_TRUE(bf.get() == FMT_NULL);
 }
 
 TEST(BufferedFileTest, MoveAssignmentClosesFile) {
@@ -90,13 +90,13 @@ TEST(BufferedFileTest, MoveAssignmentClosesFile) {
 }
 
 TEST(BufferedFileTest, MoveFromTemporaryInCtor) {
-  FILE *fp = nullptr;
+  FILE *fp = FMT_NULL;
   buffered_file f(open_buffered_file(&fp));
   EXPECT_EQ(fp, f.get());
 }
 
 TEST(BufferedFileTest, MoveFromTemporaryInAssignment) {
-  FILE *fp = nullptr;
+  FILE *fp = FMT_NULL;
   buffered_file f;
   f = open_buffered_file(&fp);
   EXPECT_EQ(fp, f.get());
@@ -126,7 +126,7 @@ TEST(BufferedFileTest, CloseErrorInDtor) {
       // output in EXPECT_STDERR and the second close will break output
       // redirection.
       FMT_POSIX(close(f->fileno()));
-      SUPPRESS_ASSERT(f.reset(nullptr));
+      SUPPRESS_ASSERT(f.reset(FMT_NULL));
   }, format_system_error(EBADF, "cannot close file") + "\n");
 }
 
@@ -134,7 +134,7 @@ TEST(BufferedFileTest, Close) {
   buffered_file f = open_buffered_file();
   int fd = f.fileno();
   f.close();
-  EXPECT_TRUE(f.get() == nullptr);
+  EXPECT_TRUE(f.get() == FMT_NULL);
   EXPECT_TRUE(isclosed(fd));
 }
 
@@ -142,7 +142,7 @@ TEST(BufferedFileTest, CloseError) {
   buffered_file f = open_buffered_file();
   FMT_POSIX(close(f.fileno()));
   EXPECT_SYSTEM_ERROR_NOASSERT(f.close(), EBADF, "cannot close file");
-  EXPECT_TRUE(f.get() == nullptr);
+  EXPECT_TRUE(f.get() == FMT_NULL);
 }
 
 TEST(BufferedFileTest, Fileno) {
@@ -253,7 +253,7 @@ TEST(FileTest, CloseErrorInDtor) {
       // output in EXPECT_STDERR and the second close will break output
       // redirection.
       FMT_POSIX(close(f->descriptor()));
-      SUPPRESS_ASSERT(f.reset(nullptr));
+      SUPPRESS_ASSERT(f.reset(FMT_NULL));
   }, format_system_error(EBADF, "cannot close file") + "\n");
 }
 
@@ -334,7 +334,7 @@ TEST(FileTest, Dup2NoExcept) {
   file copy = open_file();
   error_code ec;
   f.dup2(copy.descriptor(), ec);
-  EXPECT_EQ(0, ec.get());
+  EXPECT_EQ(ec.get(), 0);
   EXPECT_NE(f.descriptor(), copy.descriptor());
   EXPECT_READ(copy, FILE_CONTENT);
 }

externals/fmt/test/printf-test.cc

@@ -32,22 +32,33 @@ static std::wstring make_positional(fmt::wstring_view format) {
   return s;
 }
 
+// A wrapper around fmt::sprintf to workaround bogus warnings about invalid
+// format strings in MSVC.
+template <typename... Args>
+std::string test_sprintf(fmt::string_view format, const Args &... args) {
+  return fmt::sprintf(format, args...);
+}
+template <typename... Args>
+std::wstring test_sprintf(fmt::wstring_view format, const Args &... args) {
+  return fmt::sprintf(format, args...);
+}
+
 #define EXPECT_PRINTF(expected_output, format, arg) \
-  EXPECT_EQ(expected_output, fmt::sprintf(format, arg)) \
+  EXPECT_EQ(expected_output, test_sprintf(format, arg)) \
     << "format: " << format; \
   EXPECT_EQ(expected_output, fmt::sprintf(make_positional(format), arg))
 
 TEST(PrintfTest, NoArgs) {
-  EXPECT_EQ("test", fmt::sprintf("test"));
+  EXPECT_EQ("test", test_sprintf("test"));
   EXPECT_EQ(L"test", fmt::sprintf(L"test"));
 }
 
 TEST(PrintfTest, Escape) {
-  EXPECT_EQ("%", fmt::sprintf("%%"));
-  EXPECT_EQ("before %", fmt::sprintf("before %%"));
-  EXPECT_EQ("% after", fmt::sprintf("%% after"));
-  EXPECT_EQ("before % after", fmt::sprintf("before %% after"));
-  EXPECT_EQ("%s", fmt::sprintf("%%s"));
+  EXPECT_EQ("%", test_sprintf("%%"));
+  EXPECT_EQ("before %", test_sprintf("before %%"));
+  EXPECT_EQ("% after", test_sprintf("%% after"));
+  EXPECT_EQ("before % after", test_sprintf("before %% after"));
+  EXPECT_EQ("%s", test_sprintf("%%s"));
   EXPECT_EQ(L"%", fmt::sprintf(L"%%"));
   EXPECT_EQ(L"before %", fmt::sprintf(L"before %%"));
   EXPECT_EQ(L"% after", fmt::sprintf(L"%% after"));
@@ -56,60 +67,60 @@ TEST(PrintfTest, Escape) {
 }
 
 TEST(PrintfTest, PositionalArgs) {
-  EXPECT_EQ("42", fmt::sprintf("%1$d", 42));
-  EXPECT_EQ("before 42", fmt::sprintf("before %1$d", 42));
-  EXPECT_EQ("42 after", fmt::sprintf("%1$d after",42));
-  EXPECT_EQ("before 42 after", fmt::sprintf("before %1$d after", 42));
-  EXPECT_EQ("answer = 42", fmt::sprintf("%1$s = %2$d", "answer", 42));
+  EXPECT_EQ("42", test_sprintf("%1$d", 42));
+  EXPECT_EQ("before 42", test_sprintf("before %1$d", 42));
+  EXPECT_EQ("42 after", test_sprintf("%1$d after",42));
+  EXPECT_EQ("before 42 after", test_sprintf("before %1$d after", 42));
+  EXPECT_EQ("answer = 42", test_sprintf("%1$s = %2$d", "answer", 42));
   EXPECT_EQ("42 is the answer",
-      fmt::sprintf("%2$d is the %1$s", "answer", 42));
-  EXPECT_EQ("abracadabra", fmt::sprintf("%1$s%2$s%1$s", "abra", "cad"));
+      test_sprintf("%2$d is the %1$s", "answer", 42));
+  EXPECT_EQ("abracadabra", test_sprintf("%1$s%2$s%1$s", "abra", "cad"));
 }
 
 TEST(PrintfTest, AutomaticArgIndexing) {
-  EXPECT_EQ("abc", fmt::sprintf("%c%c%c", 'a', 'b', 'c'));
+  EXPECT_EQ("abc", test_sprintf("%c%c%c", 'a', 'b', 'c'));
 }
 
 TEST(PrintfTest, NumberIsTooBigInArgIndex) {
-  EXPECT_THROW_MSG(fmt::sprintf(format("%{}$", BIG_NUM)),
+  EXPECT_THROW_MSG(test_sprintf(format("%{}$", BIG_NUM)),
       format_error, "number is too big");
-  EXPECT_THROW_MSG(fmt::sprintf(format("%{}$d", BIG_NUM)),
+  EXPECT_THROW_MSG(test_sprintf(format("%{}$d", BIG_NUM)),
       format_error, "number is too big");
 }
 
 TEST(PrintfTest, SwitchArgIndexing) {
-  EXPECT_THROW_MSG(fmt::sprintf("%1$d%", 1, 2),
+  EXPECT_THROW_MSG(test_sprintf("%1$d%", 1, 2),
       format_error, "cannot switch from manual to automatic argument indexing");
-  EXPECT_THROW_MSG(fmt::sprintf(format("%1$d%{}d", BIG_NUM), 1, 2),
+  EXPECT_THROW_MSG(test_sprintf(format("%1$d%{}d", BIG_NUM), 1, 2),
       format_error, "number is too big");
-  EXPECT_THROW_MSG(fmt::sprintf("%1$d%d", 1, 2),
+  EXPECT_THROW_MSG(test_sprintf("%1$d%d", 1, 2),
       format_error, "cannot switch from manual to automatic argument indexing");
 
-  EXPECT_THROW_MSG(fmt::sprintf("%d%1$", 1, 2),
+  EXPECT_THROW_MSG(test_sprintf("%d%1$", 1, 2),
       format_error, "cannot switch from automatic to manual argument indexing");
-  EXPECT_THROW_MSG(fmt::sprintf(format("%d%{}$d", BIG_NUM), 1, 2),
+  EXPECT_THROW_MSG(test_sprintf(format("%d%{}$d", BIG_NUM), 1, 2),
       format_error, "number is too big");
-  EXPECT_THROW_MSG(fmt::sprintf("%d%1$d", 1, 2),
+  EXPECT_THROW_MSG(test_sprintf("%d%1$d", 1, 2),
       format_error, "cannot switch from automatic to manual argument indexing");
 
   // Indexing errors override width errors.
-  EXPECT_THROW_MSG(fmt::sprintf(format("%d%1${}d", BIG_NUM), 1, 2),
+  EXPECT_THROW_MSG(test_sprintf(format("%d%1${}d", BIG_NUM), 1, 2),
       format_error, "number is too big");
-  EXPECT_THROW_MSG(fmt::sprintf(format("%1$d%{}d", BIG_NUM), 1, 2),
+  EXPECT_THROW_MSG(test_sprintf(format("%1$d%{}d", BIG_NUM), 1, 2),
       format_error, "number is too big");
 }
 
 TEST(PrintfTest, InvalidArgIndex) {
-  EXPECT_THROW_MSG(fmt::sprintf("%0$d", 42), format_error,
+  EXPECT_THROW_MSG(test_sprintf("%0$d", 42), format_error,
       "argument index out of range");
-  EXPECT_THROW_MSG(fmt::sprintf("%2$d", 42), format_error,
+  EXPECT_THROW_MSG(test_sprintf("%2$d", 42), format_error,
       "argument index out of range");
-  EXPECT_THROW_MSG(fmt::sprintf(format("%{}$d", INT_MAX), 42),
+  EXPECT_THROW_MSG(test_sprintf(format("%{}$d", INT_MAX), 42),
       format_error, "argument index out of range");
 
-  EXPECT_THROW_MSG(fmt::sprintf("%2$", 42),
+  EXPECT_THROW_MSG(test_sprintf("%2$", 42),
       format_error, "argument index out of range");
-  EXPECT_THROW_MSG(fmt::sprintf(format("%{}$d", BIG_NUM), 42),
+  EXPECT_THROW_MSG(test_sprintf(format("%{}$d", BIG_NUM), 42),
       format_error, "number is too big");
 }
 
@@ -180,13 +191,8 @@ TEST(PrintfTest, HashFlag) {
   safe_sprintf(buffer, "%#E", -42.0);
   EXPECT_PRINTF(buffer, "%#E", -42.0);
 
-  if (fmt::internal::use_grisu()) {
-    EXPECT_PRINTF("-42.0", "%#g", -42.0);
-    EXPECT_PRINTF("-42.0", "%#G", -42.0);
-  } else {
   EXPECT_PRINTF("-42.0000", "%#g", -42.0);
   EXPECT_PRINTF("-42.0000", "%#G", -42.0);
-  }
 
   safe_sprintf(buffer, "%#a", 16.0);
   EXPECT_PRINTF(buffer, "%#a", 16.0);
@@ -201,23 +207,23 @@ TEST(PrintfTest, Width) {
   EXPECT_PRINTF("  abc", "%5s", "abc");
 
   // Width cannot be specified twice.
-  EXPECT_THROW_MSG(fmt::sprintf("%5-5d", 42), format_error,
+  EXPECT_THROW_MSG(test_sprintf("%5-5d", 42), format_error,
       "invalid type specifier");
 
-  EXPECT_THROW_MSG(fmt::sprintf(format("%{}d", BIG_NUM), 42),
+  EXPECT_THROW_MSG(test_sprintf(format("%{}d", BIG_NUM), 42),
       format_error, "number is too big");
-  EXPECT_THROW_MSG(fmt::sprintf(format("%1${}d", BIG_NUM), 42),
+  EXPECT_THROW_MSG(test_sprintf(format("%1${}d", BIG_NUM), 42),
       format_error, "number is too big");
 }
 
 TEST(PrintfTest, DynamicWidth) {
-  EXPECT_EQ("   42", fmt::sprintf("%*d", 5, 42));
-  EXPECT_EQ("42   ", fmt::sprintf("%*d", -5, 42));
-  EXPECT_THROW_MSG(fmt::sprintf("%*d", 5.0, 42), format_error,
+  EXPECT_EQ("   42", test_sprintf("%*d", 5, 42));
+  EXPECT_EQ("42   ", test_sprintf("%*d", -5, 42));
+  EXPECT_THROW_MSG(test_sprintf("%*d", 5.0, 42), format_error,
       "width is not integer");
-  EXPECT_THROW_MSG(fmt::sprintf("%*d"), format_error,
+  EXPECT_THROW_MSG(test_sprintf("%*d"), format_error,
       "argument index out of range");
-  EXPECT_THROW_MSG(fmt::sprintf("%*d", BIG_NUM, 42), format_error,
+  EXPECT_THROW_MSG(test_sprintf("%*d", BIG_NUM, 42), format_error,
       "number is too big");
 }
 
@@ -258,17 +264,17 @@ TEST(PrintfTest, IgnorePrecisionForNonNumericArg) {
 }
 
 TEST(PrintfTest, DynamicPrecision) {
-  EXPECT_EQ("00042", fmt::sprintf("%.*d", 5, 42));
-  EXPECT_EQ("42", fmt::sprintf("%.*d", -5, 42));
-  EXPECT_THROW_MSG(fmt::sprintf("%.*d", 5.0, 42), format_error,
+  EXPECT_EQ("00042", test_sprintf("%.*d", 5, 42));
+  EXPECT_EQ("42", test_sprintf("%.*d", -5, 42));
+  EXPECT_THROW_MSG(test_sprintf("%.*d", 5.0, 42), format_error,
       "precision is not integer");
-  EXPECT_THROW_MSG(fmt::sprintf("%.*d"), format_error,
+  EXPECT_THROW_MSG(test_sprintf("%.*d"), format_error,
       "argument index out of range");
-  EXPECT_THROW_MSG(fmt::sprintf("%.*d", BIG_NUM, 42), format_error,
+  EXPECT_THROW_MSG(test_sprintf("%.*d", BIG_NUM, 42), format_error,
       "number is too big");
   if (sizeof(long long) != sizeof(int)) {
     long long prec = static_cast<long long>(INT_MIN) - 1;
-    EXPECT_THROW_MSG(fmt::sprintf("%.*d", prec, 42), format_error,
+    EXPECT_THROW_MSG(test_sprintf("%.*d", prec, 42), format_error,
         "number is too big");
  }
 }
@@ -431,11 +437,11 @@ TEST(PrintfTest, Char) {
 
 TEST(PrintfTest, String) {
   EXPECT_PRINTF("abc", "%s", "abc");
-  const char *null_str = nullptr;
+  const char *null_str = FMT_NULL;
   EXPECT_PRINTF("(null)", "%s", null_str);
   EXPECT_PRINTF("    (null)", "%10s", null_str);
   EXPECT_PRINTF(L"abc", L"%s", L"abc");
-  const wchar_t *null_wstr = nullptr;
+  const wchar_t *null_wstr = FMT_NULL;
   EXPECT_PRINTF(L"(null)", L"%s", null_wstr);
   EXPECT_PRINTF(L"    (null)", L"%10s", null_wstr);
 }
@@ -444,22 +450,22 @@ TEST(PrintfTest, Pointer) {
   int n;
   void *p = &n;
   EXPECT_PRINTF(fmt::format("{}", p), "%p", p);
-  p = nullptr;
+  p = FMT_NULL;
   EXPECT_PRINTF("(nil)", "%p", p);
   EXPECT_PRINTF("     (nil)", "%10p", p);
   const char *s = "test";
   EXPECT_PRINTF(fmt::format("{:p}", s), "%p", s);
-  const char *null_str = nullptr;
+  const char *null_str = FMT_NULL;
   EXPECT_PRINTF("(nil)", "%p", null_str);
 
   p = &n;
   EXPECT_PRINTF(fmt::format(L"{}", p), L"%p", p);
-  p = nullptr;
+  p = FMT_NULL;
   EXPECT_PRINTF(L"(nil)", L"%p", p);
   EXPECT_PRINTF(L"     (nil)", L"%10p", p);
   const wchar_t *w = L"test";
   EXPECT_PRINTF(fmt::format(L"{:p}", w), L"%p", w);
-  const wchar_t *null_wstr = nullptr;
+  const wchar_t *null_wstr = FMT_NULL;
   EXPECT_PRINTF(L"(nil)", L"%p", null_wstr);
 }
 
@@ -495,7 +501,7 @@ TEST(PrintfTest, WideString) {
 }
 
 TEST(PrintfTest, PrintfCustom) {
-  EXPECT_EQ("abc", fmt::sprintf("%s", TestString("abc")));
+  EXPECT_EQ("abc", test_sprintf("%s", TestString("abc")));
 }
 
 TEST(PrintfTest, OStream) {
@@ -504,3 +510,60 @@ TEST(PrintfTest, OStream) {
   EXPECT_EQ("Don't panic!", os.str());
   EXPECT_EQ(12, ret);
 }
+
+TEST(PrintfTest, VPrintf) {
+  fmt::format_arg_store<fmt::printf_context, int> as{42};
+  fmt::basic_format_args<fmt::printf_context> args(as);
+  EXPECT_EQ(fmt::vsprintf("%d", args), "42");
+  EXPECT_WRITE(stdout, fmt::vprintf("%d", args), "42");
+  EXPECT_WRITE(stdout, fmt::vfprintf(stdout, "%d", args), "42");
+  EXPECT_WRITE(stdout, fmt::vfprintf(std::cout, "%d", args), "42");
+}
+
+template<typename... Args>
+void check_format_string_regression(fmt::string_view s, const Args&... args) {
+  fmt::sprintf(s, args...);
+}
+
+TEST(PrintfTest, CheckFormatStringRegression) {
+  check_format_string_regression("%c%s", 'x', "");
+}
+
+TEST(PrintfTest, VSPrintfMakeArgsExample) {
+  fmt::format_arg_store<fmt::printf_context, int, const char *> as{
+      42, "something"};
+  fmt::basic_format_args<fmt::printf_context> args(as);
+  EXPECT_EQ(
+      "[42] something happened", fmt::vsprintf("[%d] %s happened", args));
+  auto as2 = fmt::make_printf_args(42, "something");
+  fmt::basic_format_args<fmt::printf_context> args2(as2);
+  EXPECT_EQ(
+      "[42] something happened", fmt::vsprintf("[%d] %s happened", args2));
+  //the older gcc versions can't cast the return value
+#if !defined(__GNUC__) || (__GNUC__ > 4) 
+  EXPECT_EQ(
+      "[42] something happened",
+      fmt::vsprintf(
+          "[%d] %s happened", fmt::make_printf_args(42, "something")));
+#endif
+}
+
+TEST(PrintfTest, VSPrintfMakeWArgsExample) {
+  fmt::format_arg_store<fmt::wprintf_context, int, const wchar_t *> as{
+     42, L"something"};
+  fmt::basic_format_args<fmt::wprintf_context> args(as);
+  EXPECT_EQ(
+     L"[42] something happened",
+     fmt::vsprintf(L"[%d] %s happened", args));
+  auto  as2 = fmt::make_wprintf_args(42, L"something");
+  fmt::basic_format_args<fmt::wprintf_context> args2(as2);
+  EXPECT_EQ(
+      L"[42] something happened", fmt::vsprintf(L"[%d] %s happened", args2));
+  // the older gcc versions can't cast the return value
+#if !defined(__GNUC__) || (__GNUC__ > 4)
+  EXPECT_EQ(
+      L"[42] something happened",
+      fmt::vsprintf(
+          L"[%d] %s happened", fmt::make_wprintf_args(42, L"something")));
+#endif
+}

externals/fmt/test/ranges-test.cc

@@ -9,12 +9,11 @@
 // All Rights Reserved
 // {fmt} support for ranges, containers and types tuple interface.
 
-#include "fmt/ranges.h"
-
 /// Check if  'if constexpr' is supported.
 #if (__cplusplus > 201402L) || \
     (defined(_MSVC_LANG) && _MSVC_LANG > 201402L && _MSC_VER >= 1910)
 
+#include "fmt/ranges.h"
 #include "gtest.h"
 
 #include <vector>

externals/fmt/test/time-test.cc

@@ -10,6 +10,7 @@
 #endif
 
 #include "gmock.h"
+#include "fmt/locale.h"
 #include "fmt/time.h"
 
 TEST(TimeTest, Format) {
@@ -26,10 +27,18 @@ TEST(TimeTest, GrowBuffer) {
   for (int i = 0; i < 30; ++i)
     s += "%c";
   s += "}\n";
-  std::time_t t = std::time(nullptr);
+  std::time_t t = std::time(FMT_NULL);
   fmt::format(s, *std::localtime(&t));
 }
 
+TEST(TimeTest, FormatToEmptyContainer) {
+  std::string s;
+  auto time = std::tm();
+  time.tm_sec = 42;
+  fmt::format_to(std::back_inserter(s), "{:%S}", time);
+  EXPECT_EQ(s, "42");
+}
+
 TEST(TimeTest, EmptyResult) {
   EXPECT_EQ("", fmt::format("{}", std::tm()));
 }
@@ -47,13 +56,13 @@ static bool EqualTime(const std::tm &lhs, const std::tm &rhs) {
 }
 
 TEST(TimeTest, LocalTime) {
-  std::time_t t = std::time(nullptr);
+  std::time_t t = std::time(FMT_NULL);
   std::tm tm = *std::localtime(&t);
   EXPECT_TRUE(EqualTime(tm, fmt::localtime(t)));
 }
 
 TEST(TimeTest, GMTime) {
-  std::time_t t = std::time(nullptr);
+  std::time_t t = std::time(FMT_NULL);
   std::tm tm = *std::gmtime(&t);
   EXPECT_TRUE(EqualTime(tm, fmt::gmtime(t)));
 }

externals/fmt/test/util.h

@@ -35,7 +35,7 @@ std::string get_system_error(int error_code);
 extern const char *const FILE_CONTENT;
 
 // Opens a buffered file for reading.
-fmt::buffered_file open_buffered_file(FILE **fp = nullptr);
+fmt::buffered_file open_buffered_file(FILE **fp = FMT_NULL);
 
 inline FILE *safe_fopen(const char *filename, const char *mode) {
 #if defined(_WIN32) && !defined(__MINGW32__)