Initial work on Lua-configured rendering

compile.sh

@@ -1,2 +1,2 @@
 #!/usr/bin/env bash
-gcc `pkg-config --cflags --libs cairo x11` -w -g -lpthread main.c -o main.o
+gcc `pkg-config --cflags --libs cairo x11 lua` -w -g -lpthread main.c -o main.o

main.c

@@ -12,7 +12,7 @@
 */
 
 // --------------
-// TextBar v0.1.2
+// LuaBar v0.2.0
 // --------------
 // Usage: <text generator> | textbar | <input handler>
 //
@@ -23,6 +23,10 @@
 // Line buffered
 // Prints all mouse clicks to stdout
 // In the format of `X Y` (without the '`')
+// Rendering handled by config.lua
+// File dofile'd every render
+// Called as draw(ctx, width, text_conf, text, text_other)
+// Some cairo bindings provided (see below)
 
 #include <pthread.h>
 
@@ -42,14 +46,22 @@
 #include <cairo.h>
 #include <cairo-xlib.h>
 
+#include <lua.h>
+#include <lauxlib.h>
+#include <lualib.h>
+
 Display* dpy;
+lua_State *lua;
 Window win;
 cairo_surface_t* sfc;
-cairo_surface_t* sfc2;
 cairo_t* ctx;
-cairo_t* ctx2;
 char text[256] = {0};
 char text_other[256] = {0};
+char text_other2[256] = {0};
+char text_conf[256] = {0};
+float b_col_r = 0.157;
+float b_col_g = 0.165;
+float b_col_b = 0.212;
 int width;
 
 
@@ -57,13 +69,198 @@ int width;
 #define POSITION 0 // 1 means top, 0 means bottom. Blame C.
 #define FONT "Fira Code"
 #define FONT_SIZE 16
-#define BG_COLOR 0.157, 0.165, 0.212, 0.950
+#define FONT_SIZE2 16
+#define BG_COLOR b_col_r, b_col_g, b_col_b, 0.950
 #define FG_COLOR 0.973, 0.973, 0.949, 1.000
 
 // COMPUTATION
 #define HEIGHT FONT_SIZE*2
 #define FONT_POS FONT_SIZE*1.4
 
+#define FONT_POS2 FONT_SIZE2*1.4
+//#define FONT_POS2 FONT_SIZE2*2.2/2.0
+
+int l_cairo_set_source_rgba(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+	double r = lua_tonumber(L, 2);
+	double g = lua_tonumber(L, 3);
+	double b = lua_tonumber(L, 4);
+	double a = lua_tonumber(L, 5);
+
+	//printf("set_source_rgba(%d, %f, %f, %f, %f)\n", ctx, r, g, b, a);
+
+	cairo_set_source_rgba(ctx, r, g, b, a);
+
+	return 0;
+}
+
+int l_cairo_arc(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+	double xc = lua_tonumber(L, 2);
+	double yc = lua_tonumber(L, 3);
+	double r = lua_tonumber(L, 4);
+	double a1 = lua_tonumber(L, 5);
+	double a2 = lua_tonumber(L, 6);
+
+	//printf("set_source_rgba(%d, %f, %f, %f, %f)\n", ctx, r, g, b, a);
+
+	cairo_arc(ctx, xc, yc, r, a1, a2);
+
+	return 0;
+}
+
+int l_cairo_rectangle(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+	double x = lua_tonumber(L, 2);
+	double y = lua_tonumber(L, 3);
+	double w = lua_tonumber(L, 4);
+	double h = lua_tonumber(L, 5);
+
+	//printf("set_source_rgba(%d, %f, %f, %f, %f)\n", ctx, r, g, b, a);
+
+	cairo_rectangle(ctx, x, y, w, h);
+
+	return 0;
+}
+
+int l_cairo_paint(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+
+	//printf("paint()\n");
+
+	cairo_paint(ctx);
+
+	return 0;
+}
+
+int l_cairo_fill(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+
+	//printf("fill()\n");
+
+	cairo_fill(ctx);
+
+	return 0;
+}
+
+int l_cairo_stroke(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+
+	//printf("stroke()\n");
+
+	cairo_stroke(ctx);
+
+	return 0;
+}
+
+int l_cairo_rel_line_to(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+	double x = lua_tonumber(L, 2);
+	double y = lua_tonumber(L, 3);
+
+	//printf("move_to(%f, %f)\n", x, y);
+
+	cairo_rel_line_to(ctx, x, y);
+
+	return 0;
+}
+
+
+int l_cairo_move_to(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+	double x = lua_tonumber(L, 2);
+	double y = lua_tonumber(L, 3);
+
+	//printf("move_to(%f, %f)\n", x, y);
+
+	cairo_move_to(ctx, x, y);
+
+	return 0;
+}
+
+int l_cairo_select_font_face(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+	char* fm = lua_tostring(L, 2);
+	cairo_font_slant_t sl = lua_tonumber(L, 3);
+	cairo_font_weight_t wg = lua_tonumber(L, 4);
+
+	//printf("select_font_face(%s, %d, %d)\n", fm, sl, wg);
+
+	cairo_select_font_face(ctx, fm, sl, wg);
+
+	return 0;
+}
+
+int l_cairo_set_font_size(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+	double sz = lua_tonumber(L, 2);
+
+	//printf("set_font_size(%f)\n", sz);
+
+	cairo_set_font_size(ctx, sz);
+
+	return 0;
+}
+
+int l_cairo_set_line_width(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+	double wh = lua_tonumber(L, 2);
+
+	//printf("set_line_width(%f)\n", wh);
+
+	cairo_set_line_width(ctx, wh);
+
+	return 0;
+}
+
+int l_cairo_show_text(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+	char* txt = lua_tostring(L, 2);
+
+	//printf("show_text(%s)\n", txt);
+
+	cairo_show_text(ctx, txt);
+
+	return 0;
+}
+
+int l_cairo_text_extents(lua_State *L) {
+	void* ctx = (uint64_t)lua_tonumber(L, 1);
+	char* txt = lua_tostring(L, 2);
+
+
+	cairo_text_extents_t extents;
+	cairo_text_extents(ctx, txt, &extents);
+
+	lua_createtable(L, 0, 6);
+
+	lua_pushstring(L, "x_bearing");
+	lua_pushinteger(L, extents.x_bearing);
+	lua_settable(L, -3);
+
+	lua_pushstring(L, "y_bearing");
+	lua_pushinteger(L, extents.y_bearing);
+	lua_settable(L, -3);
+
+	lua_pushstring(L, "width");
+	lua_pushinteger(L, extents.width);
+	lua_settable(L, -3);
+
+	lua_pushstring(L, "height");
+	lua_pushinteger(L, extents.height);
+	lua_settable(L, -3);
+
+	lua_pushstring(L, "x_advance");
+	lua_pushinteger(L, extents.x_advance);
+	lua_settable(L, -3);
+
+	lua_pushstring(L, "y_advance");
+	lua_pushinteger(L, extents.y_advance);
+	lua_settable(L, -3);
+
+	return 1;
+}
+
 void init() {
 	dpy = XOpenDisplay(NULL);
 	int screen = DefaultScreen(dpy);
@@ -101,43 +298,70 @@ void init() {
 
 	XMapWindow(dpy, win);
 	sfc = cairo_xlib_surface_create(dpy, win, visualinfo.visual, DisplayWidth(dpy, screen), HEIGHT);
-	sfc2 = cairo_surface_create_similar(sfc, CAIRO_CONTENT_COLOR_ALPHA, DisplayWidth(dpy, screen), HEIGHT);
 	ctx = cairo_create(sfc);
-	ctx2 = cairo_create(sfc2);
+
+	lua = luaL_newstate();
+	luaL_openlibs(lua);
+
+	//luaL_dofile(lua, "config.lua");
+
+	lua_pushcfunction(lua, l_cairo_set_source_rgba);
+	lua_setglobal(lua, "cairo_set_source_rgba");
+	lua_pushcfunction(lua, l_cairo_paint);
+	lua_setglobal(lua, "cairo_paint");
+	lua_pushcfunction(lua, l_cairo_move_to);
+	lua_setglobal(lua, "cairo_move_to");
+	lua_pushcfunction(lua, l_cairo_select_font_face);
+	lua_setglobal(lua, "cairo_select_font_face");
+	lua_pushcfunction(lua, l_cairo_set_font_size);
+	lua_setglobal(lua, "cairo_set_font_size");
+	lua_pushcfunction(lua, l_cairo_show_text);
+	lua_setglobal(lua, "cairo_show_text");
+	lua_pushcfunction(lua, l_cairo_text_extents);
+	lua_setglobal(lua, "cairo_text_extents");
+	lua_pushcfunction(lua, l_cairo_fill);
+	lua_setglobal(lua, "cairo_fill");
+	lua_pushcfunction(lua, l_cairo_stroke);
+	lua_setglobal(lua, "cairo_stroke");
+	lua_pushcfunction(lua, l_cairo_arc);
+	lua_setglobal(lua, "cairo_arc");
+	lua_pushcfunction(lua, l_cairo_rectangle);
+	lua_setglobal(lua, "cairo_rectangle");
+	lua_pushcfunction(lua, l_cairo_set_line_width);
+	lua_setglobal(lua, "cairo_set_line_width");
+	lua_pushcfunction(lua, l_cairo_rel_line_to);
+	lua_setglobal(lua, "cairo_rel_line_to");
 }
 
 pthread_mutex_t do_paint;
 void paint(Display* dpy) {
 	if(!pthread_mutex_lock(&do_paint)) {
-		// Clear
-		cairo_set_source_rgba(ctx2, 0.0, 0.0, 0.0, 0.0);
-		cairo_set_operator(ctx2, CAIRO_OPERATOR_SOURCE);
-		cairo_paint(ctx2);
-		cairo_set_operator(ctx2, CAIRO_OPERATOR_OVER);
 
-		// Background
+		cairo_push_group(ctx);
-		cairo_set_source_rgba(ctx2, BG_COLOR);
-		cairo_paint(ctx2);
 
-		// Left text
+		cairo_set_source_rgba(ctx, 0.0, 0.0, 0.0, 0.0);
-		cairo_move_to(ctx2, FONT_SIZE / 2, FONT_POS);
+
-		cairo_select_font_face(ctx2, FONT, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
+	  cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE);
-		cairo_set_font_size(ctx2, FONT_SIZE);
+	  cairo_paint(ctx);
-		cairo_set_source_rgba(ctx2, FG_COLOR);
+
-		cairo_show_text(ctx2, text);
+		cairo_set_operator(ctx, CAIRO_OPERATOR_OVER);
+
+		luaL_dofile(lua, "config.lua");
+
+		lua_getglobal(lua, "draw");
+		lua_pushinteger(lua, ctx);
+		lua_pushinteger(lua, width);
+		lua_pushstring(lua, text_conf);
+		lua_pushstring(lua, text);
+		lua_pushstring(lua, text_other);
+
+	  lua_pcall(lua, 5, 0, 0);
+	 
+		cairo_pop_group_to_source(ctx);
 
-		// Right text
-		cairo_text_extents_t extents;
-		cairo_text_extents(ctx2, text_other, &extents);
-		cairo_move_to(ctx2, (width-extents.width) - FONT_SIZE / 2, FONT_POS);
-		cairo_show_text(ctx2, text_other);
-
-		// Backbuffer -> Frontbuffer
-		cairo_set_source_surface(ctx, sfc2, 0, 0);
 		cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE);
 		cairo_paint(ctx);
 
-		// Flushing
 		cairo_surface_flush(sfc);
 		XFlush(dpy);
 
@@ -149,9 +373,13 @@ void update() {
 	while(1) {
 		fgets(text, 256, stdin);
 		fgets(text_other, 256, stdin);
+		fgets(text_other2, 256, stdin);
+		fgets(text_conf, 256, stdin);
 
 		text[strcspn(text, "\n")] = 0;
 		text_other[strcspn(text_other, "\n")] = 0;
+		text_other2[strcspn(text_other2, "\n")] = 0;
+		text_conf[strcspn(text_conf, "\n")] = 0;
 
 		paint(dpy);
 	}
@@ -163,7 +391,7 @@ void x_loop() {
 	while(1) {
 		XEvent e;
 		XNextEvent(x_dpy, &e);
-		if(e.type == ButtonPress) {
+		if(e.type == ButtonPress && e.xbutton.button == Button1) {
 			printf("%d %d\n", e.xbutton.x, e.xbutton.y);
 			fflush(stdout);
 		} else if(e.type == ConfigureNotify) {

shell.nix

@@ -9,8 +9,9 @@ pkgs.mkShell {
 		cairo.dev
 		cairo.devdoc
 		pkg-config
-		python39
+		python310
-		python39Packages.i3ipc
+		lua5_4
+		(python310Packages.i3ipc.overrideAttrs(old:{patches=[(fetchpatch{url="https://github.com/altdesktop/i3ipc-python/pull/200.patch";sha256="sha256-kAPg4KTpmVtegoRErJJaFcxXBGXHdJlZZd/HqdY3LHs=";})];}))
 		acpi
   ];
  	shellHook = ''