Port away from fmt to std::format

Author: wengxt

CMakeLists.txt

@@ -16,18 +16,11 @@ set(GCOV_TOOL "gcov" CACHE STRING "Path to gcov tool used by coverage.")
 find_package(Fcitx5Core ${REQUIRED_FCITX_VERSION} REQUIRED)
 find_package(Fcitx5Module REQUIRED COMPONENTS TestFrontend)
 find_package(Gettext REQUIRED)
-find_package(fmt REQUIRED)
 find_package(PkgConfig REQUIRED)
 pkg_check_modules(M17NGui IMPORTED_TARGET "m17n-gui>=1.6.3" REQUIRED)
 # Required for data and testing
 pkg_check_modules(M17NDB "m17n-db" REQUIRED)
 
-if (TARGET fmt::fmt-header-only)
-  set(FMT_TARGET fmt::fmt-header-only)
-else()
-  set(FMT_TARGET fmt::fmt)
-endif ()
-
 include("${FCITX_INSTALL_CMAKECONFIG_DIR}/Fcitx5Utils/Fcitx5CompilerSettings.cmake")
 add_definitions(-DFCITX_GETTEXT_DOMAIN=\"fcitx5-m17n\" -D_GNU_SOURCE)
 fcitx5_add_i18n_definition()

im/CMakeLists.txt

@@ -5,7 +5,7 @@ set(fcitx_m17n_sources
     )
 
 add_fcitx5_addon(m17n ${fcitx_m17n_sources})
-target_link_libraries(m17n Fcitx5::Core Fcitx5::Config ${FMT_TARGET} PkgConfig::M17NGui)
+target_link_libraries(m17n Fcitx5::Core Fcitx5::Config PkgConfig::M17NGui)
 target_include_directories(m17n PRIVATE ${PROJECT_BINARY_DIR})
 set_target_properties(m17n PROPERTIES PREFIX "")
 install(TARGETS m17n DESTINATION "${CMAKE_INSTALL_LIBDIR}/fcitx5")

im/engine.cpp

@@ -32,7 +32,7 @@
 #include <fcitx/text.h>
 #include <fcitx/userinterface.h>
 #include <fcntl.h>
-#include <fmt/format.h>
+#include <format>
 #include <m17n-core.h>
 #include <m17n.h>
 #include <memory>
@@ -348,9 +348,10 @@ std::vector<InputMethodEntry> M17NEngine::listInputMethods() {
 
         std::string iconName;
         auto uniqueName = stringutils::concat("m17n_", lang, "_", name);
-        auto fxName = fmt::format(
-            _("{0} (M17N)"),
-            (item && item->i18nName.size()) ? _(item->i18nName) : name);
+        const std::string i18nname =
+            (item && item->i18nName.size()) ? _(item->i18nName) : name;
+        auto fxName =
+            std::vformat(_("{0} (M17N)"), std::make_format_args(i18nname));
 
         info = minput_get_title_icon(mlang, mname);
         // head of info is a MText