cmlib/CMLibQtTranslation.cmake

function(qt_translation)
  find_package(Qt5 COMPONENTS LinguistTools REQUIRED)

  set(options)
  set(oneValueArgs TARGET TS_DIR)
  set(multiValueArgs LANGUAGES)

  cmake_parse_arguments(_QTTR
                        "${options}"
                        "${oneValueArgs}"
                        "${multiValueArgs}"
                        ${ARGN})
  set(_target ${_QTTR_TARGET})
  set(_ts_dir ${_QTTR_TS_DIR})
  set(_languages ${_QTTR_LANGUAGES})
  get_target_property(_sources ${_target} SOURCES)

  set(L10N_QRC_BODY "")
  make_directory(${_ts_dir})

  foreach(_lang ${_languages})
    set(_ts "${_target}_${_lang}.ts")
    set(_qm "${_target}_${_lang}.qm")
    list(APPEND _ts_list ${_ts_dir}/${_ts})
    list(APPEND _l10n_targets "${_target}_l10n_${_lang}")
    string(APPEND L10N_QRC_BODY "<file alias=\"${_qm}\">${CMAKE_BINARY_DIR}/${_qm}</file>\n")

    add_custom_target(${_target}_l10n_${_lang}
                      COMMAND ${Qt5_LUPDATE_EXECUTABLE}
                              ${_sources}
                              -ts
                              ${_ts_dir}/${_ts}
                              -target-language
                              ${_lang}
                      DEPENDS ${_sources})

    if(NOT EXISTS "${_ts_dir}/${_ts}")
      add_custom_target(${_ts} DEPENDS ${_target}_l10n_${_lang})
    else()
      add_custom_target(${_ts} COMMAND echo "Skipping lupdate for ${_ts}")
    endif()

    add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${_qm}
                       COMMAND ${Qt5_LRELEASE_EXECUTABLE}
                               ARGS
                               ${_ts_dir}/${_ts}
                               -qm
                               ${CMAKE_BINARY_DIR}/${_qm}
                       DEPENDS ${_ts} ${_sources})
  endforeach()

  configure_file(${CMLIB_MODULE_DIR}/qrc/l10n.qrc.in ${CMAKE_BINARY_DIR}/${_target}_l10n.qrc)
  qt5_add_resources(_qrc ${CMAKE_BINARY_DIR}/${_target}_l10n.qrc)
  add_custom_target(${_target}_qrc DEPENDS ${_qrc})
  add_custom_target(${_target}_l10n DEPENDS ${_l10n_targets})
  if(NOT TARGET l10n)
    add_custom_target(l10n)
  endif()
  add_dependencies(l10n ${_target}_l10n)

  add_dependencies(${_target} ${_target}_qrc)
  target_sources(${_target} PUBLIC ${_qrc})
endfunction()