context: Add program directory's path

includes/context.hpp

@@ -33,6 +33,7 @@ typedef struct ctx {
   std::shared_ptr<Selection> selection = nullptr;
   std::shared_ptr<PaternsMenu> paterns_menu = nullptr;
   nlohmann::json config_json;
+  std::filesystem::path program_dir;
 } ctx;
 
 } // namespace gol

src/main.cpp

@@ -82,6 +82,15 @@ int main(int ac, char **av) {
     context->config_json["fps"] = 800;
   }
 
+  // Get program directory
+  char path_buf[1024];
+  ssize_t len = readlink("/proc/self/exe", path_buf, sizeof(path_buf)-1);
+  if (len == -1) {
+    std::cerr << "Failed to determine program directory" << std::endl;
+    return 1;
+  }
+  context->program_dir = std::filesystem::path(path_buf).parent_path();
+
   InitWindow(context->config_json["screen_width"], context->config_json["screen_height"],
              &av[0][2]);
 

src/selection_menu.cpp

@@ -62,11 +62,8 @@ void SelectionMenu::display() {
     rlImGuiImageSize(&selectionTexture_.texture, 200, 200);
     ImGui::InputText("patern_name", patern_name_, 255);
     if (ImGui::Button("Save")) {
-      char path_buf[1024];
-      ssize_t len = readlink("/proc/self/exe", path_buf, sizeof(path_buf)-1);
-      if (len != -1) {
       // Create paterns dir if not present
-        std::filesystem::path paterns_dir = std::filesystem::path(path_buf).parent_path() / "paterns";
+      std::filesystem::path paterns_dir = context_->program_dir / "paterns";
       if (!std::filesystem::exists(paterns_dir) && !std::filesystem::create_directory(paterns_dir)) {
         std::cerr << "Failed to create paterns directory" << std::endl;
       } else { // Could be optimized by early returning in a function
@@ -97,7 +94,6 @@ void SelectionMenu::display() {
       }
       sel_ctrl_ = false;
     }
-    }
     ImGui::SameLine();
     if (ImGui::Button("Discard")) {
       sel_ctrl_ = false;