Build: Simplify add_translation_targets

Deduplicate the _create_ts_custom_target calls by splitting the creation
of .ts and .qm targets. For both targets, one can specify a different
set of languages by passing TS_LANGUAGES or QM_LANGUAGES.

This is currently used for the "en" language that merely serves as a
typo hotfix translation.

Change-Id: I83bd10033188d4adf3dc0f78ecd81bcafc68ccaa
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

cmake/QtCreatorTranslations.cmake

@@ -161,7 +161,7 @@ function(add_translation_targets file_prefix)
 
   cmake_parse_arguments(_arg ""
     "OUTPUT_DIRECTORY;INSTALL_DESTINATION;TS_TARGET_PREFIX;QM_TARGET_PREFIX;ALL_QM_TARGET"
-    "LANGUAGES;TARGETS;SOURCES;INCLUDES" ${ARGN})
+    "TS_LANGUAGES;QM_LANGUAGES;TARGETS;SOURCES;INCLUDES" ${ARGN})
   if (_arg_UNPARSED_ARGUMENTS)
     message(FATAL_ERROR "Invalid parameters to add_translation_targets: ${_arg_UNPARSED_ARGUMENTS}.")
   endif()
@@ -194,8 +194,20 @@ function(add_translation_targets file_prefix)
     INCLUDES ${_to_process_includes} ${_arg_INCLUDES}
   )
 
-  _create_ts_custom_target(untranslated
-    FILE_PREFIX "${file_prefix}" TS_TARGET_PREFIX "${_arg_TS_TARGET_PREFIX}"
+  set(ts_languages untranslated ${_arg_TS_LANGUAGES})
+  foreach(language IN LISTS ts_languages)
+    _create_ts_custom_target(${language}
+      FILE_PREFIX "${file_prefix}" TS_TARGET_PREFIX "${_arg_TS_TARGET_PREFIX}"
+      LUPDATE_RESPONSE_FILE "${lupdate_response_file}"
+      DEPENDS ${_arg_SOURCES}
+    )
+  endforeach()
+
+  # Create ts_all* targets.
+  _create_ts_custom_target(all
+    LANGUAGES ${ts_languages}
+    FILE_PREFIX "${file_prefix}"
+    TS_TARGET_PREFIX "${_arg_TS_TARGET_PREFIX}"
     LUPDATE_RESPONSE_FILE "${lupdate_response_file}"
     DEPENDS ${_arg_SOURCES}
   )
@@ -206,17 +218,10 @@ function(add_translation_targets file_prefix)
 
   file(MAKE_DIRECTORY ${_arg_OUTPUT_DIRECTORY})
 
-  foreach(l IN ITEMS ${_arg_LANGUAGES})
+  foreach(l IN LISTS _arg_QM_LANGUAGES)
     set(_ts_file "${CMAKE_CURRENT_SOURCE_DIR}/${file_prefix}_${l}.ts")
     set(_qm_file "${_arg_OUTPUT_DIRECTORY}/${file_prefix}_${l}.qm")
 
-    _create_ts_custom_target("${l}"
-      FILE_PREFIX "${file_prefix}"
-      TS_TARGET_PREFIX "${_arg_TS_TARGET_PREFIX}"
-      LUPDATE_RESPONSE_FILE "${lupdate_response_file}"
-      DEPENDS ${_arg_SOURCES}
-    )
-
     add_custom_command(OUTPUT "${_qm_file}"
       COMMAND Qt::lrelease "${_ts_file}" -qm "${_qm_file}"
       MAIN_DEPENDENCY "${_ts_file}"
@@ -228,14 +233,4 @@ function(add_translation_targets file_prefix)
 
     add_dependencies("${_arg_ALL_QM_TARGET}" "${_arg_QM_TARGET_PREFIX}${l}")
   endforeach()
-
-  # Create ts_all* targets.
-  set(languages_for_all_target untranslated ${_arg_LANGUAGES})
-  list(REMOVE_ITEM languages_for_all_target en)
-  _create_ts_custom_target(all
-    LANGUAGES ${languages_for_all_target}
-    FILE_PREFIX "${file_prefix}"
-    TS_TARGET_PREFIX "${_arg_TS_TARGET_PREFIX}"
-    LUPDATE_RESPONSE_FILE "${lupdate_response_file}"
-  )
 endfunction()

share/qtcreator/translations/CMakeLists.txt

@@ -1,4 +1,4 @@
-set(languages cs da de en fr hr ja pl ru sl uk zh_CN zh_TW)
+set(languages cs da de fr hr ja pl ru sl uk zh_CN zh_TW)
 set(bad_languages hu) # Fix these before including them in languages!
 
 find_package(Python3 COMPONENTS Interpreter)
@@ -45,7 +45,8 @@ else()
 endif()
 
 add_translation_targets(qtcreator
-  LANGUAGES ${languages}
+  TS_LANGUAGES ${languages}
+  QM_LANGUAGES ${languages} en
   OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/${IDE_DATA_PATH}/translations"
   INSTALL_DESTINATION "${IDE_DATA_PATH}/translations"
   TARGETS "${__QTC_LIBRARIES}" "${__QTC_PLUGINS}"