CMake/Modules/FindGettext.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file LICENSE.rst or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
FindGettext
-----------

Find GNU gettext tools.

This module looks for the GNU gettext tools.

Result Variables
^^^^^^^^^^^^^^^^

This module defines the following variables:

``GETTEXT_FOUND``
  True if gettext has been found.

``GETTEXT_VERSION_STRING``
  The version of gettext found.

``GETTEXT_MSGMERGE_EXECUTABLE``
  The full path to the msgmerge tool.

``GETTEXT_MSGFMT_EXECUTABLE``
  The full path to the msgfmt tool.

Functions
^^^^^^^^^

This module provides several function.

.. command:: gettext_create_translations

  .. code-block:: cmake

    gettext_create_translations(<potfile> [ALL] <file>...)

  This function creates a custom target "translations" which processes the
  given .pot file to .mo files. The generated binary files will be installed
  into ``share/locale/`` directory. Options:

  ``ALL``
    The translations will be created when building the default target.

.. command:: gettext_process_pot_file

  .. code-block:: cmake

      gettext_process_pot_file(<potfile> [ALL]
                               [INSTALL_DESTINATION <destdir>]
                               LANGUAGES <lang>...)

  This function creates a custom target "potfiles" which processes the given
  .pot file to .mo files. Options:

  ``ALL``
    The .pot file will be processed when building the default target.

  ``INSTALL_DESTINATION``
    Install the results into the given directory (``share/locale/`` by
    default). The language subdirectory will be taken into account.

.. command:: gettext_process_po_files

  .. code-block:: cmake

    gettext_process_po_files(<lang> [ALL]
                             [INSTALL_DESTINATION <dir>]
                             PO_FILES <pofile>...)

  This function creates a custom target "pofiles", which processes the given
  .po files to .mo files for the given language. Options:

  ``ALL``
    The .po files will be processed when building the default target.

  ``INSTALL_DESTINATION``
    Install the results into the given directory (``share/locale/`` by
    default). The language subdirectory will be taken into account.

.. versionadded:: 3.2
  If you wish to use the Gettext runtime library (libintl), use
  :module:`FindIntl`.
#]=======================================================================]

find_program(GETTEXT_MSGMERGE_EXECUTABLE msgmerge)

find_program(GETTEXT_MSGFMT_EXECUTABLE msgfmt)

if(GETTEXT_MSGMERGE_EXECUTABLE)
  execute_process(COMMAND ${GETTEXT_MSGMERGE_EXECUTABLE} --version
                  OUTPUT_VARIABLE gettext_version
                  ERROR_QUIET
                  OUTPUT_STRIP_TRAILING_WHITESPACE)
  get_filename_component(msgmerge_name ${GETTEXT_MSGMERGE_EXECUTABLE} NAME)
  get_filename_component(msgmerge_namewe ${GETTEXT_MSGMERGE_EXECUTABLE} NAME_WE)
  if(gettext_version MATCHES "^(${msgmerge_name}|${msgmerge_namewe}) \\([^\\)]*\\) ([0-9\\.]+[^ \n]*)")
    set(GETTEXT_VERSION_STRING "${CMAKE_MATCH_2}")
  endif()
  unset(gettext_version)
  unset(msgmerge_name)
  unset(msgmerge_namewe)
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Gettext
                                  REQUIRED_VARS GETTEXT_MSGMERGE_EXECUTABLE GETTEXT_MSGFMT_EXECUTABLE
                                  VERSION_VAR GETTEXT_VERSION_STRING)

function(_GETTEXT_GET_UNIQUE_TARGET_NAME _name _unique_name)
  set(propertyName "_GETTEXT_UNIQUE_COUNTER_${_name}")
  get_property(currentCounter GLOBAL PROPERTY "${propertyName}")
  if(NOT currentCounter)
    set(currentCounter 1)
  endif()
  set(${_unique_name} "${_name}_${currentCounter}" PARENT_SCOPE)
  math(EXPR currentCounter "${currentCounter} + 1")
  set_property(GLOBAL PROPERTY ${propertyName} ${currentCounter})
endfunction()

macro(GETTEXT_CREATE_TRANSLATIONS _potFile _firstPoFileArg)
  # make it a real variable, so we can modify it here
  set(_firstPoFile "${_firstPoFileArg}")

  set(_gmoFiles)
  get_filename_component(_potName ${_potFile} NAME)
  string(REGEX REPLACE "^(.+)(\\.[^.]+)$" "\\1" _potBasename ${_potName})
  get_filename_component(_absPotFile ${_potFile} ABSOLUTE)

  set(_addToAll)
  if(${_firstPoFile} STREQUAL "ALL")
    set(_addToAll "ALL")
    set(_firstPoFile)
  endif()

  foreach(_currentPoFile ${_firstPoFile} ${ARGN})
    get_filename_component(_absFile ${_currentPoFile} ABSOLUTE)
    get_filename_component(_abs_PATH ${_absFile} PATH)
    get_filename_component(_lang ${_absFile} NAME_WE)
    set(_gmoFile ${CMAKE_CURRENT_BINARY_DIR}/${_lang}.gmo)

    add_custom_command(
      OUTPUT ${_gmoFile}
      COMMAND ${GETTEXT_MSGMERGE_EXECUTABLE} --quiet --update --backup=none ${_absFile} ${_absPotFile}
      COMMAND ${GETTEXT_MSGFMT_EXECUTABLE} -o ${_gmoFile} ${_absFile}
      DEPENDS ${_absPotFile} ${_absFile}
    )

    install(FILES ${_gmoFile} DESTINATION share/locale/${_lang}/LC_MESSAGES RENAME ${_potBasename}.mo)
    set(_gmoFiles ${_gmoFiles} ${_gmoFile})

  endforeach()

  if(NOT TARGET translations)
    add_custom_target(translations)
  endif()

  _GETTEXT_GET_UNIQUE_TARGET_NAME(translations uniqueTargetName)

  add_custom_target(${uniqueTargetName} ${_addToAll} DEPENDS ${_gmoFiles})

  add_dependencies(translations ${uniqueTargetName})

endmacro()


function(GETTEXT_PROCESS_POT_FILE _potFile)
  set(_gmoFiles)
  set(_options ALL)
  set(_oneValueArgs INSTALL_DESTINATION)
  set(_multiValueArgs LANGUAGES)

  cmake_parse_arguments(_parsedArguments "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})

  get_filename_component(_potName ${_potFile} NAME)
  string(REGEX REPLACE "^(.+)(\\.[^.]+)$" "\\1" _potBasename ${_potName})
  get_filename_component(_absPotFile ${_potFile} ABSOLUTE)

  foreach(_lang ${_parsedArguments_LANGUAGES})
    set(_poFile  "${CMAKE_CURRENT_BINARY_DIR}/${_lang}.po")
    set(_gmoFile "${CMAKE_CURRENT_BINARY_DIR}/${_lang}.gmo")

    add_custom_command(
      OUTPUT "${_poFile}"
      COMMAND ${GETTEXT_MSGMERGE_EXECUTABLE} --quiet --update --backup=none ${_poFile} ${_absPotFile}
      DEPENDS ${_absPotFile}
    )

    add_custom_command(
      OUTPUT "${_gmoFile}"
      COMMAND ${GETTEXT_MSGFMT_EXECUTABLE} -o ${_gmoFile} ${_poFile}
      DEPENDS ${_absPotFile} ${_poFile}
    )

    if(_parsedArguments_INSTALL_DESTINATION)
      install(FILES ${_gmoFile} DESTINATION ${_parsedArguments_INSTALL_DESTINATION}/${_lang}/LC_MESSAGES RENAME ${_potBasename}.mo)
    endif()
    list(APPEND _gmoFiles ${_gmoFile})
  endforeach()

  if(NOT TARGET potfiles)
    add_custom_target(potfiles)
  endif()

  _GETTEXT_GET_UNIQUE_TARGET_NAME( potfiles uniqueTargetName)

  if(_parsedArguments_ALL)
    add_custom_target(${uniqueTargetName} ALL DEPENDS ${_gmoFiles})
  else()
    add_custom_target(${uniqueTargetName} DEPENDS ${_gmoFiles})
  endif()

  add_dependencies(potfiles ${uniqueTargetName})

endfunction()


function(GETTEXT_PROCESS_PO_FILES _lang)
  set(_options ALL)
  set(_oneValueArgs INSTALL_DESTINATION)
  set(_multiValueArgs PO_FILES)
  set(_gmoFiles)

  cmake_parse_arguments(_parsedArguments "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})

  foreach(_current_PO_FILE ${_parsedArguments_PO_FILES})
    get_filename_component(_name ${_current_PO_FILE} NAME)
    string(REGEX REPLACE "^(.+)(\\.[^.]+)$" "\\1" _basename ${_name})
    set(_gmoFile ${CMAKE_CURRENT_BINARY_DIR}/${_basename}.gmo)
    add_custom_command(OUTPUT ${_gmoFile}
      COMMAND ${GETTEXT_MSGFMT_EXECUTABLE} -o ${_gmoFile} ${_current_PO_FILE}
      WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
      DEPENDS ${_current_PO_FILE}
    )

    if(_parsedArguments_INSTALL_DESTINATION)
      install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${_basename}.gmo DESTINATION ${_parsedArguments_INSTALL_DESTINATION}/${_lang}/LC_MESSAGES/ RENAME ${_basename}.mo)
    endif()
    list(APPEND _gmoFiles ${_gmoFile})
  endforeach()


  if(NOT TARGET pofiles)
    add_custom_target(pofiles)
  endif()

  _GETTEXT_GET_UNIQUE_TARGET_NAME(pofiles uniqueTargetName)

  if(_parsedArguments_ALL)
    add_custom_target(${uniqueTargetName} ALL DEPENDS ${_gmoFiles})
  else()
    add_custom_target(${uniqueTargetName} DEPENDS ${_gmoFiles})
  endif()

  add_dependencies(pofiles ${uniqueTargetName})

endfunction()