refactor(clock): extract waybar_time to util/waybar_time.hpp

include/modules/clock.hpp

@@ -1,21 +1,14 @@
 #pragma once
 
-#include <fmt/format.h>
-#if FMT_VERSION < 60000
-#include <fmt/time.h>
-#else
-#include <fmt/chrono.h>
-#endif
 #include <date/tz.h>
 #include "ALabel.hpp"
 #include "util/sleeper_thread.hpp"
 
-namespace waybar::modules {
+namespace waybar {
 
-struct waybar_time {
-  std::locale locale;
-  date::zoned_seconds ztime;
-};
+struct waybar_time;
+
+namespace modules {
 
 const std::string kCalendarPlaceholder = "calendar";
 
@@ -43,4 +36,5 @@ class Clock : public ALabel {
   bool is_timezone_fixed();
 };
 
-}  // namespace waybar::modules
+}  // namespace modules
+}  // namespace waybar

include/util/waybar_time.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <fmt/format.h>
+#if FMT_VERSION < 60000
+#include <fmt/time.h>
+#else
+#include <fmt/chrono.h>
+#endif
+#include <date/tz.h>
+
+namespace waybar {
+
+struct waybar_time {
+  std::locale         locale;
+  date::zoned_seconds ztime;
+};
+
+}  // namespace waybar
+
+template <>
+struct fmt::formatter<waybar::waybar_time> : fmt::formatter<std::tm> {
+  template <typename FormatContext>
+  auto format(const waybar::waybar_time& t, FormatContext& ctx) {
+#if FMT_VERSION >= 80000
+    auto& tm_format = specs;
+#endif
+    return format_to(ctx.out(), "{}", date::format(t.locale, fmt::to_string(tm_format), t.ztime));
+  }
+};