feat: font selector

src/gui/font_loader.cpp

@@ -226,3 +226,101 @@ void font_loader::pop_font()
 {
     ImGui::PopFont();
 }
+
+std::vector<std::string> font_loader::get_system_fonts()
+{
+    std::vector<std::string> fonts;
+
+#if defined(_WIN32)
+    auto enumerate_registry_fonts = [&fonts](HKEY root_key, const char* subkey)
+    {
+        HKEY hKey;
+        if (RegOpenKeyExA(root_key, subkey, 0, KEY_READ, &hKey) != ERROR_SUCCESS)
+            return;
+
+        char value_name[512];
+        DWORD value_name_size;
+        DWORD index = 0;
+
+        while (true)
+        {
+            value_name_size = sizeof(value_name);
+            LONG result = RegEnumValueA(hKey, index++, value_name, &value_name_size, nullptr, nullptr, nullptr, nullptr);
+            
+            if (result != ERROR_SUCCESS)
+                break;
+
+            std::string font_name = value_name;
+            size_t pos = font_name.find(" (");
+            if (pos != std::string::npos)
+                font_name = font_name.substr(0, pos);
+            
+            if (std::find(fonts.begin(), fonts.end(), font_name) == fonts.end())
+                fonts.push_back(font_name);
+        }
+
+        RegCloseKey(hKey);
+    };
+
+    enumerate_registry_fonts(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Fonts");
+    enumerate_registry_fonts(HKEY_CURRENT_USER, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Fonts");
+
+#elif defined(__APPLE__)
+    CTFontCollectionRef collection = CTFontCollectionCreateFromAvailableFonts(nullptr);
+    if (collection)
+    {
+        CFArrayRef fontDescriptors = CTFontCollectionCreateMatchingFontDescriptors(collection);
+        CFRelease(collection);
+        
+        if (fontDescriptors)
+        {
+            CFIndex count = CFArrayGetCount(fontDescriptors);
+            for (CFIndex i = 0; i < count; i++)
+            {
+                CTFontDescriptorRef descriptor = (CTFontDescriptorRef)CFArrayGetValueAtIndex(fontDescriptors, i);
+                CFStringRef fontName = (CFStringRef)CTFontDescriptorCopyAttribute(descriptor, kCTFontDisplayNameAttribute);
+                
+                if (fontName)
+                {
+                    char buffer[256];
+                    if (CFStringGetCString(fontName, buffer, sizeof(buffer), kCFStringEncodingUTF8))
+                    {
+                        std::string font_name = buffer;
+                        if (std::find(fonts.begin(), fonts.end(), font_name) == fonts.end())
+                            fonts.push_back(font_name);
+                    }
+                    CFRelease(fontName);
+                }
+            }
+            CFRelease(fontDescriptors);
+        }
+    }
+
+#else
+    FcInit();
+    FcPattern* pattern = FcPatternCreate();
+    FcObjectSet* os = FcObjectSetBuild(FC_FAMILY, nullptr);
+    FcFontSet* fs = FcFontList(nullptr, pattern, os);
+    
+    if (fs)
+    {
+        for (int i = 0; i < fs->nfont; i++)
+        {
+            FcChar8* family = nullptr;
+            if (FcPatternGetString(fs->fonts[i], FC_FAMILY, 0, &family) == FcResultMatch)
+            {
+                std::string font_name = reinterpret_cast<const char*>(family);
+                if (std::find(fonts.begin(), fonts.end(), font_name) == fonts.end())
+                    fonts.push_back(font_name);
+            }
+        }
+        FcFontSetDestroy(fs);
+    }
+    
+    FcObjectSetDestroy(os);
+    FcPatternDestroy(pattern);
+#endif
+
+    std::sort(fonts.begin(), fonts.end());
+    return fonts;
+}

src/gui/font_loader.hpp

@@ -10,11 +10,12 @@ class font_loader
 public:
     font_loader() = default;
 
-    // Loads system font by name and returns an ImFont* or nullptr.
     ImFont* load_font(const char* font_name, float size_px);
     void push_default_font();
     void pop_font();
     
+    std::vector<std::string> get_system_fonts();
+
 private:
     std::string find_font_path(const char* font_name);
 

src/gui/settings_window.cpp

@@ -6,11 +6,15 @@
 #include <cstring>
 
 settings_window::settings_window()
-    : m_font_size(14)
+    : m_font_size(14), m_selected_font_idx(0)
 {
     m_default_theme[0] = '\0';
     m_palettes_path[0] = '\0';
     m_font[0] = '\0';
+    
+    font_loader loader;
+    m_available_fonts = loader.get_system_fonts();
+    
     load_settings();
 }
 
@@ -51,10 +55,25 @@ void settings_window::render()
         ImGui::Text("Font:");
         ImGui::SameLine();
         ImGui::SetNextItemWidth(300.0f);
-        ImGui::InputText("##font", m_font, sizeof(m_font));
+        if (ImGui::BeginCombo("##font", m_font))
+        {
+            for (int i = 0; i < static_cast<int>(m_available_fonts.size()); i++)
+            {
+                bool is_selected = (i == m_selected_font_idx);
+                if (ImGui::Selectable(m_available_fonts[i].c_str(), is_selected))
+                {
+                    m_selected_font_idx = i;
+                    strncpy(m_font, m_available_fonts[i].c_str(), sizeof(m_font) - 1);
+                    m_font[sizeof(m_font) - 1] = '\0';
+                }
+                if (is_selected)
+                    ImGui::SetItemDefaultFocus();
+            }
+            ImGui::EndCombo();
+        }
         if (ImGui::IsItemHovered())
         {
-            ImGui::SetTooltip("Font");
+            ImGui::SetTooltip("Select font for the application");
         }
         
         ImGui::Spacing();
@@ -134,6 +153,16 @@ void settings_window::load_settings()
     strncpy(m_font, font.c_str(), sizeof(m_font) - 1);
     m_font[sizeof(m_font) - 1] = '\0';
     
+    m_selected_font_idx = 0;
+    for (int i = 0; i < static_cast<int>(m_available_fonts.size()); i++)
+    {
+        if (m_available_fonts[i] == font)
+        {
+            m_selected_font_idx = i;
+            break;
+        }
+    }
+    
     m_font_size = cfg.font_size();
     
     m_error_message = "";

src/gui/settings_window.hpp

@@ -2,6 +2,7 @@
 #define CLRSYNC_GUI_SETTINGS_WINDOW_HPP
 
 #include <string>
+#include <vector>
 
 class settings_window
 {
@@ -24,6 +25,9 @@ private:
     char m_font[128];
     int m_font_size;
     
+    std::vector<std::string> m_available_fonts;
+    int m_selected_font_idx;
+    
     std::string m_error_message;
 };