Merge pull request #4960 from keepo-dot/feature/8bit-hex-support

feat(client): add support for 8-bit hex color codes in CSS

include/util/hex_checker.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <string>
+
+/**
+ * Result of transforming 8-bit hex codes to rgba().
+ */
+struct TransformResult {
+  std::string css;
+  bool was_transformed;
+};
+
+/**
+ * Reads a CSS file, searches for 8-bit hex codes (#RRGGBBAA),
+ * and transforms them into GTK-compatible rgba() syntax.
+ */
+TransformResult transform_8bit_to_hex(const std::string& file_path);

meson.build

@@ -185,7 +185,8 @@ src_files = files(
     'src/util/gtk_icon.cpp',
     'src/util/icon_loader.cpp',
     'src/util/regex_collection.cpp',
-    'src/util/css_reload_helper.cpp'
+    'src/util/css_reload_helper.cpp',
+    'src/util/transform_8bit_to_rgba.cpp'
 )
 
 man_files = files(

src/client.cpp

@@ -10,6 +10,7 @@
 #include "idle-inhibit-unstable-v1-client-protocol.h"
 #include "util/clara.hpp"
 #include "util/format.hpp"
+#include "util/hex_checker.hpp"
 
 waybar::Client* waybar::Client::inst() {
   static auto* c = new Client();
@@ -22,21 +23,18 @@ void waybar::Client::handleGlobal(void* data, struct wl_registry* registry, uint
 
   if (strcmp(interface, zxdg_output_manager_v1_interface.name) == 0 &&
       version >= ZXDG_OUTPUT_V1_NAME_SINCE_VERSION) {
-
     if (client->xdg_output_manager != nullptr) {
       zxdg_output_manager_v1_destroy(client->xdg_output_manager);
       client->xdg_output_manager = nullptr;
     }
 
-    client->xdg_output_manager = static_cast<struct zxdg_output_manager_v1*>(
-        wl_registry_bind(registry, name, &zxdg_output_manager_v1_interface,
-                         ZXDG_OUTPUT_V1_NAME_SINCE_VERSION));
+    client->xdg_output_manager = static_cast<struct zxdg_output_manager_v1*>(wl_registry_bind(
+        registry, name, &zxdg_output_manager_v1_interface, ZXDG_OUTPUT_V1_NAME_SINCE_VERSION));
 
   } else if (strcmp(interface, zwp_idle_inhibit_manager_v1_interface.name) == 0) {
-
     if (client->idle_inhibit_manager != nullptr) {
       zwp_idle_inhibit_manager_v1_destroy(client->idle_inhibit_manager);
-      client->idle_inhibit_manager = nullptr;   
+      client->idle_inhibit_manager = nullptr;
     }
 
     client->idle_inhibit_manager = static_cast<struct zwp_idle_inhibit_manager_v1*>(
@@ -209,11 +207,15 @@ auto waybar::Client::setupCss(const std::string& css_file) -> void {
   }
 
   css_provider_ = Gtk::CssProvider::create();
-  if (!css_provider_->load_from_path(css_file)) {
-    css_provider_.reset();
-    throw std::runtime_error("Can't open style file");
+  auto [modified_css, was_transformed] = transform_8bit_to_hex(css_file);
+  if (was_transformed) {
+    css_provider_->load_from_data(modified_css);
+  } else {
+    if (!css_provider_->load_from_path(css_file)) {
+      css_provider_.reset();
+      throw std::runtime_error("Can't open style file");
+    }
   }
-
   Gtk::StyleContext::add_provider_for_screen(screen, css_provider_,
                                              GTK_STYLE_PROVIDER_PRIORITY_USER);
 }

src/util/transform_8bit_to_rgba.cpp

@@ -0,0 +1,60 @@
+#include <filesystem>
+#include <fstream>
+#include <iomanip>
+#include <regex>
+#include <sstream>
+namespace fs = std::filesystem;
+
+struct TransformResult {
+  std::string css;
+  bool was_transformed;
+};
+
+TransformResult transform_8bit_to_hex(const std::string& file_path) {
+  std::ifstream f(file_path, std::ios::in | std::ios::binary);
+  const auto size = fs::file_size(file_path);
+  std::string result(size, '\0');
+  if (!f.is_open() || !f.good()) {
+    throw std::runtime_error("Cannot open file: " + file_path);
+  }
+
+  if (size == 0) {
+    return {.css = result, .was_transformed = false};
+  }
+
+  f.read(result.data(), size);
+
+  static std::regex pattern(
+      R"(\#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2}))");
+  std::string final_output;
+
+  auto it = std::sregex_iterator(result.begin(), result.end(), pattern);
+  auto eof = std::sregex_iterator();
+
+  if (it == eof) {
+    return {.css = result, .was_transformed = false};
+  }
+
+  std::smatch match;
+  while (it != eof) {
+    match = *it;
+
+    final_output += match.prefix().str();
+
+    int r = stoi(match[1].str(), nullptr, 16);
+    int g = stoi(match[2].str(), nullptr, 16);
+    int b = stoi(match[3].str(), nullptr, 16);
+    double a = (stoi(match[4].str(), nullptr, 16) / 255.0);
+
+    std::stringstream ss;
+    ss << "rgba(" << r << "," << g << "," << b << "," << std::fixed << std::setprecision(2) << a
+       << ")";
+    final_output += ss.str();
+
+    ++it;
+  }
+
+  final_output += match.suffix().str();
+
+  return {.css = final_output, .was_transformed = true};
+}