From eda4c287e920bafd7fd38999b61683b4b72159b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C5=91rinc=20Serf=C5=91z=C5=91?=
 <lorinc.serfozo@mailbox.org>
Date: Fri, 14 Jun 2024 15:48:48 +0200
Subject: [PATCH] chore(i18n): Localization skeleton

---
 CMakeLists.txt     | 51 ++++++++++++++++++++++++++++++++++++++++++++--
 po/midiconn.pot    | 19 +++++++++++++++++
 src/Version.hpp.in |  1 +
 src/main.cpp       | 17 ++++++++++++++++
 4 files changed, 86 insertions(+), 2 deletions(-)
 create mode 100644 po/midiconn.pot

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 79b3ce6..55b4d7b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,7 @@ set(CMAKE_POLICY_DEFAULT_CMP0077 NEW) # option() honors normal variables
 
 include(FetchContent)
 include(external/CMakeRC.cmake)
+include(GNUInstallDirs)
 
 project(midiconn VERSION 0.2.2 LANGUAGES CXX)
 
@@ -20,7 +21,9 @@ endif()
 if(NOT WIN32 AND MC_CHECK_FOR_UPDATES)
     find_package(CURL REQUIRED)
 endif()
+find_package(Intl REQUIRED)
 
+set(MC_LOCALE_DIR "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LOCALEDIR}")
 configure_file(
     src/Version.hpp.in
     ${CMAKE_CURRENT_BINARY_DIR}/src/Version.hpp
@@ -92,7 +95,8 @@ target_include_directories(midiconn PRIVATE
     external/imnodes
     external/portable-file-dialogs
     external/IconFontCppHeaders
-    "${FREETYPE_INCLUDE_DIRS}")
+    "${FREETYPE_INCLUDE_DIRS}"
+    "${Intl_INCLUDE_DIRS}")
 target_link_libraries(midiconn PRIVATE
     nlohmann_json::nlohmann_json
     rtmidi
@@ -102,7 +106,8 @@ target_link_libraries(midiconn PRIVATE
     fmt::fmt
     freetype
     resources
-    midi)
+    midi
+    "${Intl_LIBRARIES}")
 if(NOT WIN32 AND MC_CHECK_FOR_UPDATES)
     target_link_libraries(midiconn PRIVATE curl)
 endif()
@@ -157,3 +162,45 @@ endif()
 install(TARGETS midiconn
     RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
 include(CPack)
+
+find_program(XGETTEXT xgettext)
+find_package(Gettext)
+if (XGETTEXT AND ${GETTEXT_FOUND})
+    set(POT_FILE "${PROJECT_SOURCE_DIR}/po/midiconn.pot")
+    add_custom_command(
+        OUTPUT "${POT_FILE}"
+        COMMAND "${XGETTEXT}" "--join-existing" "--add-comments" "--output=${POT_FILE}" "--output-dir=${PROJECT_SOURCE_DIR}/po" ${sources}
+        WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
+        DEPENDS ${sources}
+    )
+
+    file(GLOB PO_FILES "${PROJECT_SOURCE_DIR}/po/*.po")
+    if(PO_FILES)
+        foreach(PO_FILE ${PO_FILES})
+            add_custom_command(
+                OUTPUT "${PO_FILE}"
+                COMMAND "${GETTEXT_MSGMERGE_EXECUTABLE}" "--update" "--backup=off" "${PO_FILE}" "${POT_FILE}"
+                WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
+                DEPENDS "${POT_FILE}"
+            )
+        endforeach()
+
+        add_custom_target(update-po DEPENDS ${PO_FILES})
+
+        foreach(PO_FILE ${PO_FILES})
+            cmake_path(GET PO_FILE STEM LANG)
+            set(MO_FILE "${CMAKE_BINARY_DIR}/${LANG}/midiconn.mo")
+            add_custom_command(
+                OUTPUT "${MO_FILE}"
+                COMMAND "${GETTEXT_MSGFMT_EXECUTABLE}" "--output-file=${MO_FILE}" "${PO_FILE}"
+                WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
+                DEPENDS "${PO_FILE}"
+            )
+            add_custom_target(generate-mo-${LANG} ALL DEPENDS ${MO_FILE})
+            install(
+                FILES "${MO_FILE}"
+                DESTINATION "${MC_LOCALE_DIR}/${LANG}/LC_MESSAGES"
+            )
+        endforeach()
+    endif()
+endif()
diff --git a/po/midiconn.pot b/po/midiconn.pot
new file mode 100644
index 0000000..a779048
--- /dev/null
+++ b/po/midiconn.pot
@@ -0,0 +1,19 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: PACKAGE VERSION\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2024-06-14 15:46+0200\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
diff --git a/src/Version.hpp.in b/src/Version.hpp.in
index 9f0ebac..8053a71 100644
--- a/src/Version.hpp.in
+++ b/src/Version.hpp.in
@@ -16,6 +16,7 @@
 #define MC_BUILD_OS    "@CMAKE_SYSTEM_NAME@-@CMAKE_SYSTEM_PROCESSOR@"
 #define MC_WEBSITE_URL "https://mfeproject.itch.io/midiconn"
 #cmakedefine MC_CHECK_FOR_UPDATES
+#define MC_LOCALE_DIR "@MC_LOCALE_DIR@"
 
 namespace mc
 {
diff --git a/src/main.cpp b/src/main.cpp
index 0cab909..dbaaf00 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -17,6 +17,7 @@
 #include "KeyboardShortcutAggregator.hpp"
 #include "PlatformUtils.hpp"
 #include "Utils.hpp"
+#include "Version.hpp"
 
 #if !SDL_VERSION_ATLEAST(2, 0, 17)
 #error This backend requires SDL 2.0.17+ because of SDL_RenderGeometry() function
@@ -38,6 +39,22 @@ MC_MAIN
     spdlog::set_default_logger(rotating_logger);
     spdlog::flush_every(3s);
 
+    if (setlocale(LC_ALL, "") == nullptr)
+    {
+        spdlog::error("Cannot set locale");
+        return -1;
+    }
+    if (bindtextdomain(MIDI_APPLICATION_NAME_SNAKE, MC_LOCALE_DIR) == nullptr)
+    {
+        spdlog::error("Cannot bind text domain");
+        return -1;
+    }
+    if (textdomain(MIDI_APPLICATION_NAME_SNAKE) == nullptr)
+    {
+        spdlog::error("Cannot set text domain");
+        return -1;
+    }
+
     mc::platform::set_process_dpi_aware();
 
     const auto file_to_open = mc::wrap_exception([&]() {