Add missing files

I accidently forgot to add them when commiting 883037029f

src/CSS.cpp

@@ -0,0 +1,68 @@
+#include "CSS.h"
+#include "Common.h"
+
+#include <string>
+#include <array>
+#include <fstream>
+
+namespace CSS
+{
+    static GtkCssProvider* sProvider;
+
+    void Load()
+    {
+        sProvider = gtk_css_provider_new();
+
+        struct CSSDir
+        {
+            std::string xdgEnv;
+            std::string fallbackPath;
+            std::string relPath;
+        };
+        std::string home = getenv("HOME");
+        std::array<CSSDir, 4> locations = {
+            CSSDir{"XDG_CONFIG_HOME", home + "/.config",      "/gBar/style.css"}, // Local config
+            CSSDir{"XDG_DATA_HOME",   home + "/.local/share", "/gBar/style.css"}, // local user install
+            CSSDir{"",                "/usr/local/share",     "/gBar/style.css"}, // local all install
+            CSSDir{"",                "/usr/share",           "/gBar/style.css"}, // package manager all install
+        };
+
+        GError* err = nullptr;
+        for (auto& dir : locations)
+        {
+            const char* xdgConfig = dir.xdgEnv.size() ? getenv(dir.xdgEnv.c_str()) : nullptr;
+            std::string file;
+            if (xdgConfig)
+            {
+                file = (std::string(xdgConfig) + dir.relPath).c_str();
+            }
+            else
+            {
+                file = (dir.fallbackPath + dir.relPath).c_str();
+            }
+            if (!std::ifstream(file).is_open())
+            {
+                LOG("Info: No CSS found in " << dir.fallbackPath);
+                continue;
+            }
+
+            gtk_css_provider_load_from_path(sProvider, file.c_str(), &err);
+
+            if (!err)
+            {
+                LOG("CSS found and loaded successfully!");
+                return;
+            }
+            LOG("Warning: Failed loading config for " << dir.fallbackPath << ", trying next one!");
+            // Log any errors
+            LOG(err->message);
+            g_error_free(err);
+        }
+        ASSERT(false, "No CSS file found!");
+    }
+
+    GtkCssProvider* GetProvider()
+    {
+        return sProvider;
+    }
+}

src/CSS.h

@@ -0,0 +1,8 @@
+#pragma once
+#include <gtk/gtk.h>
+
+namespace CSS
+{
+    void Load();
+    GtkCssProvider* GetProvider();
+}