add function to get font file through fontconfig

api/basic_widgets/utils.hpp

@@ -0,0 +1,11 @@
+#ifndef UTILS_HPP
+#define UTILS_HPP
+
+#include <exception>
+#include <string>
+
+struct NotFound : std::exception {};
+
+std::string find_font(const std::string&);
+
+#endif

examples/button_example.cpp

@@ -2,6 +2,7 @@
 
 #include <basic_widgets/button.hpp>
 #include <basic_widgets/horizontal_layout.hpp>
+#include <basic_widgets/utils.hpp>
 #include <basic_widgets/vertical_layout.hpp>
 
 int main()
@@ -10,7 +11,7 @@ int main()
     int height = 480;
 
     TTF_Init();
-    TTF_Font* font = TTF_OpenFont("fonts/FiraMono-Bold.ttf", 20);
+    TTF_Font* font = TTF_OpenFont(find_font("Monospace").c_str(), 20);
 
     SDL_Init(SDL_INIT_VIDEO);
     SDL_Window* win = SDL_CreateWindow(

examples/input_example.cpp

@@ -2,6 +2,7 @@
 
 #include <basic_widgets/horizontal_layout.hpp>
 #include <basic_widgets/numeric_input.hpp>
+#include <basic_widgets/utils.hpp>
 #include <basic_widgets/vertical_layout.hpp>
 
 int main()
@@ -10,7 +11,7 @@ int main()
     int height = 480;
 
     TTF_Init();
-    TTF_Font* font = TTF_OpenFont("fonts/FiraMono-Bold.ttf", 20);
+    TTF_Font* font = TTF_OpenFont(find_font("Monospace").c_str(), 20);
 
     SDL_Init(SDL_INIT_VIDEO);
     SDL_Window* win = SDL_CreateWindow(

meson.build

@@ -6,6 +6,7 @@ sdl = [
     dependency('sdl2', version: '>=2.0.5'),
     dependency('SDL2_ttf')
     ]
+fontconfig = dependency('fontconfig')
 
 api = include_directories('api')
 
@@ -15,16 +16,17 @@ libbasic_widgets = static_library('basic_widgets',
     'drawing_primitive.cpp',
     'horizontal_layout.cpp',
     'layout.cpp',
+    'utils.cpp',
     'vertical_layout.cpp',
     'widget.cpp',
-    dependencies : sdl,
+    dependencies : [sdl, fontconfig],
     include_directories : api,
     install : true)
 
 libbasic_widgets_dep = declare_dependency(
     include_directories : api,
     link_with: libbasic_widgets,
-    dependencies : sdl)
+    dependencies : [sdl, fontconfig])
 
 executable('button_demo',
     'examples/button_example.cpp',

utils.cpp

@@ -0,0 +1,37 @@
+#include <iostream>
+#include <fontconfig/fontconfig.h>
+
+#include <basic_widgets/utils.hpp>
+
+using namespace std;
+
+string find_font(const string& pat)
+{
+    FcConfig* conf = FcInitLoadConfigAndFonts();
+
+    FcPattern* pattern = FcNameParse((FcChar8*)pat.c_str());
+    FcConfigSubstitute(conf, pattern, FcMatchPattern);
+    FcDefaultSubstitute(pattern);
+
+    bool found = false;
+    string file_path;
+    FcResult res;
+    FcPattern* font = FcFontMatch(conf, pattern, &res);
+    if (font != nullptr)
+    {
+        FcChar8* file = nullptr;
+        if (FcPatternGetString(font, FC_FILE, 0, &file) == FcResultMatch)
+        {
+            file_path = (char*)file;
+            found = true;
+        }
+        FcPatternDestroy(font);
+    }
+    FcConfigDestroy(conf);
+    FcFini();
+
+    if (!found)
+        throw NotFound();
+
+    return file_path;
+}