meson/mesonbuild/modules/i18n.py

# Copyright 2016 The Meson development team

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from mesonbuild.interpreterbase.decorators import noPosargs, typed_pos_args
from os import path
import shutil
import typing as T

from . import ExtensionModule, ModuleReturnValue
from .. import build
from .. import coredata
from .. import mesonlib
from .. import mlog
from ..interpreterbase import permittedKwargs, FeatureNew, FeatureNewKwargs
from ..mesonlib import MesonException
from ..scripts.gettext import read_linguas

if T.TYPE_CHECKING:
    from . import ModuleState
    from ..interpreter import Interpreter
    from ..interpreterbase import TYPE_var

PRESET_ARGS = {
    'glib': [
        '--from-code=UTF-8',
        '--add-comments',

        # https://developer.gnome.org/glib/stable/glib-I18N.html
        '--keyword=_',
        '--keyword=N_',
        '--keyword=C_:1c,2',
        '--keyword=NC_:1c,2',
        '--keyword=g_dcgettext:2',
        '--keyword=g_dngettext:2,3',
        '--keyword=g_dpgettext2:2c,3',

        '--flag=N_:1:pass-c-format',
        '--flag=C_:2:pass-c-format',
        '--flag=NC_:2:pass-c-format',
        '--flag=g_dngettext:2:pass-c-format',
        '--flag=g_strdup_printf:1:c-format',
        '--flag=g_string_printf:2:c-format',
        '--flag=g_string_append_printf:2:c-format',
        '--flag=g_error_new:3:c-format',
        '--flag=g_set_error:4:c-format',
        '--flag=g_markup_printf_escaped:1:c-format',
        '--flag=g_log:3:c-format',
        '--flag=g_print:1:c-format',
        '--flag=g_printerr:1:c-format',
        '--flag=g_printf:1:c-format',
        '--flag=g_fprintf:2:c-format',
        '--flag=g_sprintf:2:c-format',
        '--flag=g_snprintf:3:c-format',
    ]
}


class I18nModule(ExtensionModule):
    def __init__(self, interpreter: 'Interpreter'):
        super().__init__(interpreter)
        self.methods.update({
            'merge_file': self.merge_file,
            'gettext': self.gettext,
        })

    @staticmethod
    def nogettext_warning() -> None:
        mlog.warning('Gettext not found, all translation targets will be ignored.', once=True)

    @staticmethod
    def _get_data_dirs(state: 'ModuleState', dirs: T.Iterable[str]) -> T.List[str]:
        """Returns source directories of relative paths"""
        src_dir = path.join(state.environment.get_source_dir(), state.subdir)
        return [path.join(src_dir, d) for d in dirs]

    @FeatureNew('i18n.merge_file', '0.37.0')
    @FeatureNewKwargs('i18n.merge_file', '0.51.0', ['args'])
    @permittedKwargs(build.CustomTarget.known_kwargs | {'data_dirs', 'po_dir', 'type', 'args'})
    @noPosargs
    def merge_file(self, state: 'ModuleState', args: T.List['TYPE_var'], kwargs) -> ModuleReturnValue:
        if not shutil.which('xgettext'):
            self.nogettext_warning()
            return
        podir = kwargs.pop('po_dir', None)
        if not podir:
            raise MesonException('i18n: po_dir is a required kwarg')
        podir = path.join(state.build_to_src, state.subdir, podir)

        file_type = kwargs.pop('type', 'xml')
        VALID_TYPES = ('xml', 'desktop')
        if file_type not in VALID_TYPES:
            raise MesonException(f'i18n: "{file_type}" is not a valid type {VALID_TYPES}')

        datadirs = self._get_data_dirs(state, mesonlib.stringlistify(kwargs.pop('data_dirs', [])))
        datadirs = '--datadirs=' + ':'.join(datadirs) if datadirs else None

        command = state.environment.get_build_command() + [
            '--internal', 'msgfmthelper',
            '@INPUT@', '@OUTPUT@', file_type, podir
        ]
        if datadirs:
            command.append(datadirs)

        if 'args' in kwargs:
            command.append('--')
            command.append(mesonlib.stringlistify(kwargs.pop('args', [])))

        kwargs['command'] = command

        # We only use this input file to create a name of the custom target.
        # Thus we can ignore the other entries.
        inputfile = mesonlib.extract_as_list(kwargs, 'input')[0]
        if isinstance(inputfile, str):
            inputfile = mesonlib.File.from_source_file(state.environment.source_dir,
                                                       state.subdir, inputfile)
        if isinstance(inputfile, mesonlib.File):
            # output could be '@BASENAME@' in which case we need to do substitutions
            # to get a unique target name.
            output = kwargs['output']
            ifile_abs = inputfile.absolute_path(state.environment.source_dir,
                                                state.environment.build_dir)
            values = mesonlib.get_filenames_templates_dict([ifile_abs], None)
            outputs = mesonlib.substitute_values([output], values)
            output = outputs[0]
            ct = build.CustomTarget(output + '_' + state.subdir.replace('/', '@').replace('\\', '@') + '_merge', state.subdir, state.subproject, kwargs)
        else:
            ct = build.CustomTarget(kwargs['output'] + '_merge', state.subdir, state.subproject, kwargs)

        return ModuleReturnValue(ct, [ct])

    @FeatureNewKwargs('i18n.gettext', '0.37.0', ['preset'])
    @FeatureNewKwargs('i18n.gettext', '0.50.0', ['install_dir'])
    @permittedKwargs({'po_dir', 'data_dirs', 'type', 'languages', 'args', 'preset', 'install', 'install_dir'})
    @typed_pos_args('i81n.gettex', str)
    def gettext(self, state: 'ModuleState', args: T.Tuple[str], kwargs) -> ModuleReturnValue:
        if not shutil.which('xgettext'):
            self.nogettext_warning()
            return
        packagename = args[0]
        languages = mesonlib.stringlistify(kwargs.get('languages', []))
        datadirs = self._get_data_dirs(state, mesonlib.stringlistify(kwargs.get('data_dirs', [])))
        extra_args = mesonlib.stringlistify(kwargs.get('args', []))
        targets = []
        gmotargets = []

        preset = kwargs.pop('preset', None)
        if preset:
            preset_args = PRESET_ARGS.get(preset)
            if not preset_args:
                raise coredata.MesonException('i18n: Preset "{}" is not one of the valid options: {}'.format(
                                              preset, list(PRESET_ARGS.keys())))
            extra_args = set(preset_args + extra_args)

        pkg_arg = '--pkgname=' + packagename
        lang_arg = '--langs=' + '@@'.join(languages) if languages else None
        datadirs = '--datadirs=' + ':'.join(datadirs) if datadirs else None
        extra_args = '--extra-args=' + '@@'.join(extra_args) if extra_args else None

        potargs = state.environment.get_build_command() + ['--internal', 'gettext', 'pot', pkg_arg]
        if datadirs:
            potargs.append(datadirs)
        if extra_args:
            potargs.append(extra_args)
        pottarget = build.RunTarget(packagename + '-pot', potargs, [], state.subdir, state.subproject)
        targets.append(pottarget)

        install = kwargs.get('install', True)
        install_dir = kwargs.get('install_dir', state.environment.coredata.get_option(mesonlib.OptionKey('localedir')))
        if not languages:
            languages = read_linguas(path.join(state.environment.source_dir, state.subdir))
        for l in languages:
            po_file = mesonlib.File.from_source_file(state.environment.source_dir,
                                                     state.subdir, l+'.po')
            gmo_kwargs = {'command': ['msgfmt', '@INPUT@', '-o', '@OUTPUT@'],
                          'input': po_file,
                          'output': packagename+'.mo',
                          'install': install,
                          # We have multiple files all installed as packagename+'.mo' in different install subdirs.
                          # What we really wanted to do, probably, is have a rename: kwarg, but that's not available
                          # to custom_targets. Crude hack: set the build target's subdir manually.
                          # Bonus: the build tree has something usable as an uninstalled bindtextdomain() target dir.
                          'install_dir': path.join(install_dir, l, 'LC_MESSAGES'),
                          'install_tag': 'i18n',
                          }
            gmotarget = build.CustomTarget(f'{packagename}-{l}.mo', path.join(state.subdir, l, 'LC_MESSAGES'), state.subproject, gmo_kwargs)
            targets.append(gmotarget)
            gmotargets.append(gmotarget)

        allgmotarget = build.AliasTarget(packagename + '-gmo', gmotargets, state.subdir, state.subproject)
        targets.append(allgmotarget)

        updatepoargs = state.environment.get_build_command() + ['--internal', 'gettext', 'update_po', pkg_arg]
        if lang_arg:
            updatepoargs.append(lang_arg)
        if datadirs:
            updatepoargs.append(datadirs)
        if extra_args:
            updatepoargs.append(extra_args)
        updatepotarget = build.RunTarget(packagename + '-update-po', updatepoargs, [], state.subdir, state.subproject)
        targets.append(updatepotarget)

        return ModuleReturnValue([gmotargets, pottarget, updatepotarget], targets)

def initialize(interp: 'Interpreter') -> I18nModule:
    return I18nModule(interp)