CMake: Add _qt_internal_get_i18n_catalogs_for_modules

This function finds the translations that belong to the Qt modules that
are used by the project. "Used by the project" means just all modules
that are pulled in via find_package for now.

This code was in Qt6CoreDeploySupport.cmake before. Now, we can call it
in other places too like Qt6LinguistToolsMacros.cmake.

Task-number: QTBUG-110444
Change-Id: I338d54d93cf285190b1430608b32334692ae4c07
Reviewed-by:  Alexey Edelev <alexey.edelev@qt.io>

2 files changed, 37 insertions, 29 deletions

diff --git a/src/corelib/Qt6CoreDeploySupport.cmake b/src/corelib/Qt6CoreDeploySupport.cmake
index 2615eca4ea..2fc8f8bf1c 100644
--- a/src/corelib/Qt6CoreDeploySupport.cmake
+++ b/src/corelib/Qt6CoreDeploySupport.cmake
@@ -585,34 +585,7 @@ function(qt6_deploy_translations)
     if(arg_CATALOGS)
         set(catalogs ${arg_CATALOGS})
     else()
-        set(catalogs qtbase)
-
-        # Find the translations that belong to the Qt modules that are used by the project.
-        # "Used by the project" means just all modules that are pulled in via find_package for now.
-        set(modules ${__QT_DEPLOY_ALL_MODULES_FOUND_VIA_FIND_PACKAGE})
-
-        set(module_catalog_mapping
-            "Bluetooth|Nfc" qtconnectivity
-            "Help" qt_help
-            "Multimedia(Widgets|QuickPrivate)?" qtmultimedia
-            "Qml|Quick" qtdeclarative
-            "SerialPort" qtserialport
-            "WebEngine" qtwebengine
-            "WebSockets" qtwebsockets
-        )
-        list(LENGTH module_catalog_mapping max_i)
-        math(EXPR max_i "${max_i} - 1")
-        foreach(module IN LISTS modules)
-            foreach(i RANGE 0 ${max_i} 2)
-                list(GET module_catalog_mapping ${i} module_rex)
-                if(NOT module MATCHES "^${module_rex}")
-                    continue()
-                endif()
-                math(EXPR k "${i} + 1")
-                list(GET module_catalog_mapping ${k} catalog)
-                list(APPEND catalogs ${catalog})
-            endforeach()
-        endforeach()
+        set(catalogs ${__QT_DEPLOY_I18N_CATALOGS})
     endif()
 
     get_filename_component(qt_translations_dir "${__QT_DEPLOY_QT_INSTALL_TRANSLATIONS}" ABSOLUTE
diff --git a/src/corelib/Qt6CoreMacros.cmake b/src/corelib/Qt6CoreMacros.cmake
index 04b5c4f62e..3bcf790006 100644
--- a/src/corelib/Qt6CoreMacros.cmake
+++ b/src/corelib/Qt6CoreMacros.cmake
@@ -3497,6 +3497,40 @@ if(NOT QT_NO_CREATE_VERSIONLESS_FUNCTIONS)
     endmacro()
 endif()
 
+# Store in ${out_var} the i18n catalogs that belong to the passed Qt modules.
+# The catalog "qtbase" is always added to the result.
+#
+# Example:
+#     _qt_internal_get_i18n_catalogs_for_modules(catalogs Quick Help)
+#     catalogs -> qtbase;qtdeclarative;qt_help
+function(_qt_internal_get_i18n_catalogs_for_modules out_var)
+    set(result "qtbase")
+    set(modules "${ARGN}")
+    set(module_catalog_mapping
+        "Bluetooth|Nfc" qtconnectivity
+        "Help" qt_help
+        "Multimedia(Widgets|QuickPrivate)?" qtmultimedia
+        "Qml|Quick" qtdeclarative
+        "SerialPort" qtserialport
+        "WebEngine" qtwebengine
+        "WebSockets" qtwebsockets
+    )
+    list(LENGTH module_catalog_mapping max_i)
+    math(EXPR max_i "${max_i} - 1")
+    foreach(module IN LISTS modules)
+        foreach(i RANGE 0 ${max_i} 2)
+            list(GET module_catalog_mapping ${i} module_rex)
+            if(NOT module MATCHES "^(${module_rex})")
+                continue()
+            endif()
+            math(EXPR k "${i} + 1")
+            list(GET module_catalog_mapping ${k} catalog)
+            list(APPEND result ${catalog})
+        endforeach()
+    endforeach()
+    set("${out_var}" "${result}" PARENT_SCOPE)
+endfunction()
+
 function(qt6_generate_deploy_script)
     set(no_value_options "")
     set(single_value_options
@@ -3586,9 +3620,10 @@ function(qt6_generate_deploy_script)
     string(APPEND deploy_script "${config_infix}.cmake")
     set(${arg_OUTPUT_SCRIPT} "${deploy_script}" PARENT_SCOPE)
 
+    _qt_internal_get_i18n_catalogs_for_modules(catalogs ${QT_ALL_MODULES_FOUND_VIA_FIND_PACKAGE})
     set(boiler_plate "include(${QT_DEPLOY_SUPPORT})
 include(\"\${CMAKE_CURRENT_LIST_DIR}/${arg_TARGET}-plugins${config_infix}.cmake\" OPTIONAL)
-set(__QT_DEPLOY_ALL_MODULES_FOUND_VIA_FIND_PACKAGE \"${QT_ALL_MODULES_FOUND_VIA_FIND_PACKAGE}\")
+set(__QT_DEPLOY_I18N_CATALOGS \"${catalogs}\")
 ")
     list(TRANSFORM arg_CONTENT REPLACE "\\$" "\$")
     file(GENERATE OUTPUT ${deploy_script} CONTENT "${boiler_plate}${arg_CONTENT}")