# Copyright 2015-2016 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.

'''This module provides helper functions for Gnome/GLib related
functionality such as gobject-introspection, gresources and gtk-doc'''

import copy
import functools
import os
import subprocess
import textwrap
import typing as T

from . import ExtensionModule
from . import GResourceTarget, GResourceHeaderTarget, GirTarget, TypelibTarget, VapiTarget
from . import ModuleReturnValue
from .. import build
from .. import interpreter
from .. import mesonlib
from .. import mlog
from ..build import CustomTarget, CustomTargetIndex, GeneratedList
from ..dependencies import Dependency, PkgConfigDependency, InternalDependency
from ..interpreterbase import noPosargs, noKwargs, permittedKwargs, FeatureNew, FeatureNewKwargs, FeatureDeprecatedKwargs, FeatureDeprecated
from ..interpreterbase import typed_kwargs, KwargInfo, ContainerTypeInfo
from ..interpreterbase.decorators import typed_pos_args
from ..mesonlib import (
    MachineChoice, MesonException, OrderedSet, Popen_safe, extract_as_list,
    join_args, HoldableObject
)
from ..programs import ExternalProgram, OverrideProgram

if T.TYPE_CHECKING:
    from typing_extensions import TypedDict

    from . import ModuleState
    from ..compilers import Compiler
    from ..interpreter import Interpreter
    from ..interpreterbase import TYPE_var, TYPE_kwargs
    from ..mesonlib import FileOrString

    class PostInstall(TypedDict):
        glib_compile_schemas: bool
        gio_querymodules: T.List[str]
        gtk_update_icon_cache: bool
        update_desktop_database: bool


# gresource compilation is broken due to the way
# the resource compiler and Ninja clash about it
#
# https://github.com/ninja-build/ninja/issues/1184
# https://bugzilla.gnome.org/show_bug.cgi?id=774368
gresource_dep_needed_version = '>= 2.51.1'

native_glib_version = None

class GnomeModule(ExtensionModule):
    def __init__(self, interpreter: 'Interpreter') -> None:
        super().__init__(interpreter)
        self.gir_dep = None
        self.install_glib_compile_schemas = False
        self.install_gio_querymodules = []
        self.install_gtk_update_icon_cache = False
        self.install_update_desktop_database = False
        self.devenv = None
        self.methods.update({
            'post_install': self.post_install,
            'compile_resources': self.compile_resources,
            'generate_gir': self.generate_gir,
            'compile_schemas': self.compile_schemas,
            'yelp': self.yelp,
            'gtkdoc': self.gtkdoc,
            'gtkdoc_html_dir': self.gtkdoc_html_dir,
            'gdbus_codegen': self.gdbus_codegen,
            'mkenums': self.mkenums,
            'mkenums_simple': self.mkenums_simple,
            'genmarshal': self.genmarshal,
            'generate_vapi': self.generate_vapi,
        })

    @staticmethod
    def _get_native_glib_version(state: 'ModuleState') -> str:
        global native_glib_version
        if native_glib_version is None:
            glib_dep = PkgConfigDependency('glib-2.0', state.environment,
                                           {'native': True, 'required': False})
            if glib_dep.found():
                native_glib_version = glib_dep.get_version()
            else:
                mlog.warning('Could not detect glib version, assuming 2.54. '
                             'You may get build errors if your glib is older.')
                native_glib_version = '2.54'
        return native_glib_version

    @mesonlib.run_once
    def __print_gresources_warning(self, state: 'ModuleState') -> None:
        if not mesonlib.version_compare(self._get_native_glib_version(state),
                                        gresource_dep_needed_version):
            mlog.warning('GLib compiled dependencies do not work reliably with \n'
                         'the current version of GLib. See the following upstream issue:',
                         mlog.bold('https://bugzilla.gnome.org/show_bug.cgi?id=774368'))

    @staticmethod
    def _print_gdbus_warning() -> None:
        mlog.warning('Code generated with gdbus_codegen() requires the root directory be added to\n'
                     '  include_directories of targets with GLib < 2.51.3:',
                     mlog.bold('https://github.com/mesonbuild/meson/issues/1387'),
                     once=True)

    def _get_dep(self, state: 'ModuleState', depname: str, native: bool = False,
                 required: bool = True) -> Dependency:
        kwargs = {'native': native, 'required': required}
        return self.interpreter.func_dependency(state.current_node, [depname], kwargs)

    def _get_native_binary(self, state: 'ModuleState', name: str, depname: str,
                           varname: str, required: bool = True) -> T.Union[ExternalProgram, OverrideProgram, 'build.Executable']:
        # Look in overrides in case glib/gtk/etc are built as subproject
        prog = self.interpreter.program_from_overrides([name], [])
        if prog is not None:
            return prog

        # Look in machine file
        prog_list = state.environment.lookup_binary_entry(MachineChoice.HOST, name)
        if prog_list is not None:
            return ExternalProgram.from_entry(name, prog_list)

        # Check if pkgconfig has a variable
        dep = self._get_dep(state, depname, native=True, required=False)
        if dep.found() and dep.type_name == 'pkgconfig':
            value = dep.get_pkgconfig_variable(varname, {})
            if value:
                return ExternalProgram(name, [value])

        # Normal program lookup
        return state.find_program(name, required=required)

    @typed_kwargs('gnome.post_install',
        KwargInfo('glib_compile_schemas', bool, default=False),
        KwargInfo('gio_querymodules', ContainerTypeInfo(list, str), default=[], listify=True),
        KwargInfo('gtk_update_icon_cache', bool, default=False),
        KwargInfo('update_desktop_database', bool, default=False, since='0.59.0'),
    )
    @noPosargs
    @FeatureNew('gnome.post_install', '0.57.0')
    def post_install(self, state: 'ModuleState', args: T.List['TYPE_var'], kwargs: 'PostInstall') -> ModuleReturnValue:
        rv: T.List['build.ExecutableSerialisation'] = []
        datadir_abs = os.path.join(state.environment.get_prefix(), state.environment.get_datadir())
        if kwargs['glib_compile_schemas'] and not self.install_glib_compile_schemas:
            self.install_glib_compile_schemas = True
            prog = self._get_native_binary(state, 'glib-compile-schemas', 'gio-2.0', 'glib_compile_schemas')
            schemasdir = os.path.join(datadir_abs, 'glib-2.0', 'schemas')
            script = state.backend.get_executable_serialisation([prog, schemasdir])
            script.skip_if_destdir = True
            rv.append(script)
        for d in kwargs['gio_querymodules']:
            if d not in self.install_gio_querymodules:
                self.install_gio_querymodules.append(d)
                prog = self._get_native_binary(state, 'gio-querymodules', 'gio-2.0', 'gio_querymodules')
                moduledir = os.path.join(state.environment.get_prefix(), d)
                script = state.backend.get_executable_serialisation([prog, moduledir])
                script.skip_if_destdir = True
                rv.append(script)
        if kwargs['gtk_update_icon_cache'] and not self.install_gtk_update_icon_cache:
            self.install_gtk_update_icon_cache = True
            prog = self._get_native_binary(state, 'gtk4-update-icon-cache', 'gtk-4.0', 'gtk4_update_icon_cache', required=False)
            found = isinstance(prog, build.Executable) or prog.found()
            if not found:
                prog = self._get_native_binary(state, 'gtk-update-icon-cache', 'gtk+-3.0', 'gtk_update_icon_cache')
            icondir = os.path.join(datadir_abs, 'icons', 'hicolor')
            script = state.backend.get_executable_serialisation([prog, '-q', '-t', '-f', icondir])
            script.skip_if_destdir = True
            rv.append(script)
        if kwargs['update_desktop_database'] and not self.install_update_desktop_database:
            self.install_update_desktop_database = True
            prog = self._get_native_binary(state, 'update-desktop-database', 'desktop-file-utils', 'update_desktop_database')
            appdir = os.path.join(datadir_abs, 'applications')
            script = state.backend.get_executable_serialisation([prog, '-q', appdir])
            script.skip_if_destdir = True
            rv.append(script)
        return ModuleReturnValue(None, rv)

    @FeatureNewKwargs('gnome.compile_resources', '0.37.0', ['gresource_bundle', 'export', 'install_header'])
    @permittedKwargs({'source_dir', 'c_name', 'dependencies', 'export', 'gresource_bundle', 'install_header',
                      'install', 'install_dir', 'extra_args', 'build_by_default'})
    @typed_pos_args('gnome.compile_resources', str, (str, mesonlib.File))
    def compile_resources(self, state: 'ModuleState', args: T.Tuple[str, 'FileOrString'], kwargs) -> 'ModuleReturnValue':
        self.__print_gresources_warning(state)
        glib_version = self._get_native_glib_version(state)

        glib_compile_resources = state.find_program('glib-compile-resources')
        cmd = [glib_compile_resources, '@INPUT@']

        source_dirs, dependencies = (mesonlib.extract_as_list(kwargs, c, pop=True) for c in ['source_dir', 'dependencies'])

        target_name, input_file = args

        # Validate dependencies
        subdirs = []
        depends = []
        for dep in dependencies:
            if isinstance(dep, mesonlib.File):
                subdirs.append(dep.subdir)
            elif isinstance(dep, (build.CustomTarget, build.CustomTargetIndex)):
                depends.append(dep)
                subdirs.append(dep.get_subdir())
                if not mesonlib.version_compare(glib_version, gresource_dep_needed_version):
                    m = 'The "dependencies" argument of gnome.compile_resources() can not\n' \
                        'be used with the current version of glib-compile-resources due to\n' \
                        '<https://bugzilla.gnome.org/show_bug.cgi?id=774368>'
                    raise MesonException(m)
            else:
                m = f'Unexpected dependency type {dep!r} for gnome.compile_resources() ' \
                    '"dependencies" argument.\nPlease pass the return value of ' \
                    'custom_target() or configure_file()'
                raise MesonException(m)

        if not mesonlib.version_compare(glib_version, gresource_dep_needed_version):
            # Resource xml files generated at build-time cannot be used with
            # gnome.compile_resources() because we need to scan the xml for
            # dependencies. Use configure_file() instead to generate it at
            # configure-time
            if isinstance(input_file, mesonlib.File):
                # glib-compile-resources will be run inside the source dir,
                # so we need either 'src_to_build' or the absolute path.
                # Absolute path is the easiest choice.
                if input_file.is_built:
                    ifile = os.path.join(state.environment.get_build_dir(), input_file.subdir, input_file.fname)
                else:
                    ifile = os.path.join(input_file.subdir, input_file.fname)
            else:
                ifile = os.path.join(state.subdir, input_file)

            depend_files, depends, subdirs = self._get_gresource_dependencies(
                state, ifile, source_dirs, dependencies)

        # Make source dirs relative to build dir now
        source_dirs = [os.path.join(state.build_to_src, state.subdir, d) for d in source_dirs]
        # Ensure build directories of generated deps are included
        source_dirs += subdirs
        # Always include current directory, but after paths set by user
        source_dirs.append(os.path.join(state.build_to_src, state.subdir))

        for source_dir in OrderedSet(source_dirs):
            cmd += ['--sourcedir', source_dir]

        if 'c_name' in kwargs:
            cmd += ['--c-name', kwargs.pop('c_name')]
        export = kwargs.pop('export', False)
        if not export:
            cmd += ['--internal']

        cmd += ['--generate', '--target', '@OUTPUT@']

        cmd += mesonlib.stringlistify(kwargs.pop('extra_args', []))

        gresource = kwargs.pop('gresource_bundle', False)
        if gresource:
            output = f'{target_name}.gresource'
            name = f'{target_name}_gresource'
        else:
            if 'c' in state.environment.coredata.compilers.host:
                output = f'{target_name}.c'
                name = f'{target_name}_c'
            elif 'cpp' in state.environment.coredata.compilers.host:
                output = f'{target_name}.cpp'
                name = f'{target_name}_cpp'
            else:
                raise MesonException('Compiling GResources into code is only supported in C and C++ projects')

        if kwargs.get('install', False) and not gresource:
            raise MesonException('The install kwarg only applies to gresource bundles, see install_header')

        install_header = kwargs.pop('install_header', False)
        if install_header and gresource:
            raise MesonException('The install_header kwarg does not apply to gresource bundles')
        if install_header and not export:
            raise MesonException('GResource header is installed yet export is not enabled')

        c_kwargs = kwargs.copy()
        c_kwargs['input'] = args[1]
        c_kwargs['output'] = output
        c_kwargs['depends'] = depends
        c_kwargs.setdefault('install_dir', [])
        if not mesonlib.version_compare(glib_version, gresource_dep_needed_version):
            # This will eventually go out of sync if dependencies are added
            c_kwargs['depend_files'] = depend_files
            c_kwargs['command'] = cmd
        else:
            depfile = f'{output}.d'
            c_kwargs['depfile'] = depfile
            c_kwargs['command'] = copy.copy(cmd) + ['--dependency-file', '@DEPFILE@']
        target_c = GResourceTarget(name, state.subdir, state.subproject, c_kwargs)

        if gresource: # Only one target for .gresource files
            return ModuleReturnValue(target_c, [target_c])

        h_kwargs = {
            'command': cmd,
            'input': input_file,
            'output': f'{target_name}.h',
            # The header doesn't actually care about the files yet it errors if missing
            'depends': depends
        }
        if 'build_by_default' in kwargs:
            h_kwargs['build_by_default'] = kwargs['build_by_default']
        if install_header:
            h_kwargs['install'] = install_header
            h_kwargs['install_dir'] = kwargs.get('install_dir',
                                                 state.environment.coredata.get_option(mesonlib.OptionKey('includedir')))
        target_h = GResourceHeaderTarget(f'{target_name}_h', state.subdir, state.subproject, h_kwargs)
        rv = [target_c, target_h]
        return ModuleReturnValue(rv, rv)

    def _get_gresource_dependencies(
            self, state: 'ModuleState', input_file: str, source_dirs: T.List[str],
            dependencies: T.Sequence[T.Union[mesonlib.File, build.CustomTarget, build.CustomTargetIndex]]
            ) -> T.Tuple[T.List[mesonlib.FileOrString], T.List[T.Union[build.CustomTarget, build.CustomTargetIndex]], T.List[str]]:

        cmd = ['glib-compile-resources',
               input_file,
               '--generate-dependencies']

        # Prefer generated files over source files
        cmd += ['--sourcedir', state.subdir] # Current build dir
        for source_dir in source_dirs:
            cmd += ['--sourcedir', os.path.join(state.subdir, source_dir)]

        try:
            pc, stdout, stderr = Popen_safe(cmd, cwd=state.environment.get_source_dir())
        except (FileNotFoundError, PermissionError):
            raise MesonException('Could not execute glib-compile-resources.')
        if pc.returncode != 0:
            m = f'glib-compile-resources failed to get dependencies for {cmd[1]}:\n{stderr}'
            mlog.warning(m)
            raise subprocess.CalledProcessError(pc.returncode, cmd)

        raw_dep_files: T.List[str] = stdout.split('\n')[:-1]

        depends: T.List[T.Union[build.CustomTarget, build.CustomTargetIndex]] = []
        subdirs: T.List[str] = []
        dep_files: T.List[mesonlib.FileOrString] = []
        for resfile in raw_dep_files.copy():
            resbasename = os.path.basename(resfile)
            for dep in dependencies:
                if isinstance(dep, mesonlib.File):
                    if dep.fname != resbasename:
                        continue
                    raw_dep_files.remove(resfile)
                    dep_files.append(dep)
                    subdirs.append(dep.subdir)
                    break
                elif isinstance(dep, (build.CustomTarget, build.CustomTargetIndex)):
                    fname = None
                    outputs = {(o, os.path.basename(o)) for o in dep.get_outputs()}
                    for o, baseo in outputs:
                        if baseo == resbasename:
                            fname = o
                            break
                    if fname is not None:
                        raw_dep_files.remove(resfile)
                        depends.append(dep)
                        subdirs.append(dep.get_subdir())
                        break
            else:
                # In generate-dependencies mode, glib-compile-resources doesn't raise
                # an error for missing resources but instead prints whatever filename
                # was listed in the input file.  That's good because it means we can
                # handle resource files that get generated as part of the build, as
                # follows.
                #
                # If there are multiple generated resource files with the same basename
                # then this code will get confused.
                try:
                    f = mesonlib.File.from_source_file(state.environment.get_source_dir(),
                                                       ".", resfile)
                except MesonException:
                    raise MesonException(
                        f'Resource "{resfile}" listed in "{input_file}" was not found. '
                        'If this is a generated file, pass the target that generates '
                        'it to gnome.compile_resources() using the "dependencies" '
                        'keyword argument.')
                raw_dep_files.remove(resfile)
                dep_files.append(f)
        dep_files.extend(raw_dep_files)
        return dep_files, depends, subdirs

    def _get_link_args(self, state: 'ModuleState',
                       lib: T.Union[build.SharedLibrary, build.StaticLibrary],
                       depends: T.List[build.BuildTarget],
                       include_rpath: bool = False,
                       use_gir_args: bool = False) -> T.List[str]:
        link_command: T.List[str] = []
        # Construct link args
        if isinstance(lib, build.SharedLibrary):
            libdir = os.path.join(state.environment.get_build_dir(), state.backend.get_target_dir(lib))
            link_command.append('-L' + libdir)
            if include_rpath:
                link_command.append('-Wl,-rpath,' + libdir)
            depends.append(lib)
            # Needed for the following binutils bug:
            # https://github.com/mesonbuild/meson/issues/1911
            # However, g-ir-scanner does not understand -Wl,-rpath
            # so we need to use -L instead
            for d in state.backend.determine_rpath_dirs(lib):
                d = os.path.join(state.environment.get_build_dir(), d)
                link_command.append('-L' + d)
                if include_rpath:
                    link_command.append('-Wl,-rpath,' + d)
        if use_gir_args and self._gir_has_option('--extra-library'):
            link_command.append('--extra-library=' + lib.name)
        else:
            link_command.append('-l' + lib.name)
        return link_command

    def _get_dependencies_flags(
            self, deps: T.Sequence[T.Union['Dependency', build.SharedLibrary, build.StaticLibrary]],
            state: 'ModuleState', depends: T.List[build.BuildTarget], include_rpath: bool = False,
            use_gir_args: bool = False, separate_nodedup: bool = False
            ) -> T.Tuple[OrderedSet[str], OrderedSet[str], OrderedSet[str], T.Optional[T.List[str]], OrderedSet[str]]:
        cflags: OrderedSet[str] = OrderedSet()
        internal_ldflags: OrderedSet[str] = OrderedSet()
        external_ldflags: OrderedSet[str] = OrderedSet()
        # External linker flags that can't be de-duped reliably because they
        # require two args in order, such as -framework AVFoundation
        external_ldflags_nodedup: T.List[str] = []
        gi_includes: OrderedSet[str] = OrderedSet()
        deps = mesonlib.listify(deps)

        for dep in deps:
            if isinstance(dep, Dependency):
                girdir = dep.get_variable(pkgconfig='girdir', internal='girdir', default_value='')
                if girdir:
                    assert isinstance(girdir, str), 'for mypy'
                    gi_includes.update([girdir])
            if isinstance(dep, InternalDependency):
                cflags.update(dep.get_compile_args())
                cflags.update(state.get_include_args(dep.include_directories))
                for lib in dep.libraries:
                    if isinstance(lib, build.SharedLibrary):
                        internal_ldflags.update(self._get_link_args(state, lib, depends, include_rpath))
                        libdepflags = self._get_dependencies_flags(lib.get_external_deps(), state, depends, include_rpath,
                                                                   use_gir_args, True)
                        cflags.update(libdepflags[0])
                        internal_ldflags.update(libdepflags[1])
                        external_ldflags.update(libdepflags[2])
                        external_ldflags_nodedup += libdepflags[3]
                        gi_includes.update(libdepflags[4])
                extdepflags = self._get_dependencies_flags(dep.ext_deps, state, depends, include_rpath,
                                                           use_gir_args, True)
                cflags.update(extdepflags[0])
                internal_ldflags.update(extdepflags[1])
                external_ldflags.update(extdepflags[2])
                external_ldflags_nodedup += extdepflags[3]
                gi_includes.update(extdepflags[4])
                for source in dep.sources:
                    if isinstance(source, GirTarget):
                        gi_includes.update([os.path.join(state.environment.get_build_dir(),
                                            source.get_subdir())])
            # This should be any dependency other than an internal one.
            elif isinstance(dep, Dependency):
                cflags.update(dep.get_compile_args())
                ldflags = iter(dep.get_link_args(raw=True))
                for flag in ldflags:
                    if (os.path.isabs(flag) and
                            # For PkgConfigDependency only:
                            getattr(dep, 'is_libtool', False)):
                        lib_dir = os.path.dirname(flag)
                        external_ldflags.update([f'-L{lib_dir}'])
                        if include_rpath:
                            external_ldflags.update([f'-Wl,-rpath {lib_dir}'])
                        libname = os.path.basename(flag)
                        if libname.startswith("lib"):
                            libname = libname[3:]
                        libname = libname.split(".so")[0]
                        flag = f"-l{libname}"
                    # FIXME: Hack to avoid passing some compiler options in
                    if flag.startswith("-W"):
                        continue
                    # If it's a framework arg, slurp the framework name too
                    # to preserve the order of arguments
                    if flag == '-framework':
                        external_ldflags_nodedup += [flag, next(ldflags)]
                    else:
                        external_ldflags.update([flag])
            elif isinstance(dep, (build.StaticLibrary, build.SharedLibrary)):
                cflags.update(state.get_include_args(dep.get_include_dirs()))
                depends.append(dep)
            else:
                mlog.log(f'dependency {dep!r} not handled to build gir files')
                continue

        if use_gir_args and self._gir_has_option('--extra-library'):
            def fix_ldflags(ldflags: T.Iterable[str]) -> OrderedSet[str]:
                fixed_ldflags: OrderedSet[str] = OrderedSet()
                for ldflag in ldflags:
                    if ldflag.startswith("-l"):
                        ldflag = ldflag.replace('-l', '--extra-library=', 1)
                    fixed_ldflags.add(ldflag)
                return fixed_ldflags
            internal_ldflags = fix_ldflags(internal_ldflags)
            external_ldflags = fix_ldflags(external_ldflags)
        if not separate_nodedup:
            external_ldflags.update(external_ldflags_nodedup)
            return cflags, internal_ldflags, external_ldflags, None, gi_includes
        else:
            return cflags, internal_ldflags, external_ldflags, external_ldflags_nodedup, gi_includes

    def _unwrap_gir_target(self, girtarget: T.Union[build.Executable, build.StaticLibrary, build.SharedLibrary], state: 'ModuleState'
                           ) -> T.Union[build.Executable, build.StaticLibrary, build.SharedLibrary]:
        if not isinstance(girtarget, (build.Executable, build.SharedLibrary,
                                      build.StaticLibrary)):
            raise MesonException(f'Gir target must be an executable or library but is "{girtarget}" of type {type(girtarget).__name__}')

        STATIC_BUILD_REQUIRED_VERSION = ">=1.58.1"
        if isinstance(girtarget, (build.StaticLibrary)) and \
           not mesonlib.version_compare(
               self._get_gir_dep(state)[0].get_version(),
               STATIC_BUILD_REQUIRED_VERSION):
            raise MesonException('Static libraries can only be introspected with GObject-Introspection ' + STATIC_BUILD_REQUIRED_VERSION)

        return girtarget

    def _devenv_prepend(self, varname: str, value: str) -> None:
        if self.devenv is None:
            self.devenv = build.EnvironmentVariables()
            self.interpreter.build.devenv.append(self.devenv)
        self.devenv.prepend(varname, [value])

    def _get_gir_dep(self, state: 'ModuleState') -> T.Tuple[Dependency, T.Union[build.Executable, 'ExternalProgram', 'OverrideProgram'],
                                                            T.Union[build.Executable, 'ExternalProgram', 'OverrideProgram']]:
        if not self.gir_dep:
            self.gir_dep = self._get_dep(state, 'gobject-introspection-1.0')
            self.giscanner = self._get_native_binary(state, 'g-ir-scanner', 'gobject-introspection-1.0', 'g_ir_scanner')
            self.gicompiler = self._get_native_binary(state, 'g-ir-compiler', 'gobject-introspection-1.0', 'g_ir_compiler')
        return self.gir_dep, self.giscanner, self.gicompiler

    @functools.lru_cache(maxsize=None)
    def _gir_has_option(self, option: str) -> bool:
        exe = self.giscanner
        if isinstance(exe, OverrideProgram):
            # Handle overridden g-ir-scanner
            assert option in {'--extra-library', '--sources-top-dirs'}
            return True
        p, o, _ = Popen_safe(exe.get_command() + ['--help'], stderr=subprocess.STDOUT)
        return p.returncode == 0 and option in o

    def _scan_header(self, kwargs: T.Dict[str, T.Any]) -> T.List[str]:
        ret = []
        header = kwargs.pop('header', None)
        if header:
            if not isinstance(header, str):
                raise MesonException('header must be a string')
            ret = ['--c-include=' + header]
        return ret

    def _scan_extra_args(self, kwargs: T.Dict[str, T.Any]) -> T.List[str]:
        return mesonlib.stringlistify(kwargs.pop('extra_args', []))

    def _scan_link_withs(self, state: 'ModuleState', depends: T.List[build.BuildTarget], kwargs: T.Dict[str, T.Any]) -> T.List[str]:
        ret: T.List[str] = []
        if 'link_with' in kwargs:
            link_with = mesonlib.extract_as_list(kwargs, 'link_with', pop = True)

            for link in link_with:
                ret += self._get_link_args(state, link, depends,
                                           use_gir_args=True)
        return ret

    # May mutate depends and gir_inc_dirs
    def _scan_include(self, state: 'ModuleState', depends: T.List[T.Union[build.BuildTarget, build.CustomTarget]],
                      gir_inc_dirs: T.List[str], kwargs: T.Dict[str, T.Any]) -> T.List[str]:
        ret: T.List[str] = []

        if 'includes' in kwargs:
            includes = mesonlib.extract_as_list(kwargs, 'includes', pop = True)
            for inc in includes:
                if isinstance(inc, str):
                    ret += [f'--include={inc}']
                elif isinstance(inc, GirTarget):
                    gir_inc_dirs += [
                        os.path.join(state.environment.get_build_dir(),
                                     inc.get_subdir()),
                    ]
                    ret += [
                        "--include-uninstalled={}".format(os.path.join(inc.get_subdir(), inc.get_basename()))
                    ]
                    depends += [inc]
                else:
                    raise MesonException(
                        'Gir includes must be str, GirTarget, or list of them. '
                        'Got %s.' % type(inc).__name__)

        return ret

    def _scan_symbol_prefix(self, kwargs: T.Dict[str, T.Any]) -> T.List[str]:
        ret: T.List[str] = []

        if 'symbol_prefix' in kwargs:
            sym_prefixes = mesonlib.stringlistify(kwargs.pop('symbol_prefix', []))
            ret += [f'--symbol-prefix={sym_prefix}' for sym_prefix in sym_prefixes]

        return ret

    def _scan_identifier_prefix(self, kwargs: T.Dict[str, T.Any]) -> T.List[str]:
        ret: T.List[str] = []

        if 'identifier_prefix' in kwargs:
            identifier_prefix = kwargs.pop('identifier_prefix')
            if not isinstance(identifier_prefix, str):
                raise MesonException('Gir identifier prefix must be str')
            ret += [f'--identifier-prefix={identifier_prefix}']

        return ret

    def _scan_export_packages(self, kwargs: T.Dict[str, T.Any]) -> T.List[str]:
        ret: T.List[str] = []

        if 'export_packages' in kwargs:
            pkgs = kwargs.pop('export_packages')
            if isinstance(pkgs, str):
                ret += [f'--pkg-export={pkgs}']
            elif isinstance(pkgs, list):
                ret += [f'--pkg-export={pkg}' for pkg in pkgs]
            else:
                raise MesonException('Gir export packages must be str or list')

        return ret

    def _scan_inc_dirs(self, kwargs: T.Dict[str, T.Any]) -> T.List[T.Union[str, build.IncludeDirs]]:
        ret = mesonlib.extract_as_list(kwargs, 'include_directories', pop = True)
        for incd in ret:
            if not isinstance(incd, (str, build.IncludeDirs)):
                raise MesonException(
                    'Gir include dirs should be include_directories().')
        # Mypy can't figure this out
        return T.cast(T.List[T.Union[str, build.IncludeDirs]], ret)

    def _scan_langs(self, state: 'ModuleState', langs: T.Iterable[str]) -> T.List[str]:
        ret: T.List[str] = []

        for lang in langs:
            link_args = state.environment.coredata.get_external_link_args(MachineChoice.HOST, lang)
            for link_arg in link_args:
                if link_arg.startswith('-L'):
                    ret.append(link_arg)

        return ret

    def _scan_gir_targets(self, state: 'ModuleState', girtargets: T.List[build.BuildTarget]) -> T.List[T.Union[str, build.Executable]]:
        ret: T.List[T.Union[str, build.Executable]] = []

        for girtarget in girtargets:
            if isinstance(girtarget, build.Executable):
                ret += ['--program', girtarget]
            else:
                # Because of https://gitlab.gnome.org/GNOME/gobject-introspection/merge_requests/72
                # we can't use the full path until this is merged.
                libpath = os.path.join(girtarget.get_subdir(), girtarget.get_filename())
                # Must use absolute paths here because g-ir-scanner will not
                # add them to the runtime path list if they're relative. This
                # means we cannot use @BUILD_ROOT@
                build_root = state.environment.get_build_dir()
                if isinstance(girtarget, build.SharedLibrary):
                    # need to put our output directory first as we need to use the
                    # generated libraries instead of any possibly installed system/prefix
                    # ones.
                    ret += ["-L{}/{}".format(build_root, os.path.dirname(libpath))]
                    libname = girtarget.get_basename()
                else:
                    libname = os.path.join(f"{build_root}/{libpath}")
                ret += ['--library', libname]
                # Needed for the following binutils bug:
                # https://github.com/mesonbuild/meson/issues/1911
                # However, g-ir-scanner does not understand -Wl,-rpath
                # so we need to use -L instead
                for d in state.backend.determine_rpath_dirs(girtarget):
                    d = os.path.join(state.environment.get_build_dir(), d)
                    ret.append('-L' + d)

        return ret

    def _get_girtargets_langs_compilers(self, girtargets: T.Sequence[build.BuildTarget]) -> T.List[T.Tuple[str, 'Compiler']]:
        ret: T.List[T.Tuple[str, 'Compiler']] = []
        for girtarget in girtargets:
            for lang, compiler in girtarget.compilers.items():
                # XXX: Can you use g-i with any other language?
                if lang in ('c', 'cpp', 'objc', 'objcpp', 'd'):
                    ret.append((lang, compiler))
                    break

        return ret

    def _get_gir_targets_deps(self, girtargets: T.Sequence[build.BuildTarget]
                              ) -> T.List[T.Union[build.Target, Dependency]]:
        ret: T.List[T.Union[build.Target, Dependency]] = []
        for girtarget in girtargets:
            ret += girtarget.get_all_link_deps()
            ret += girtarget.get_external_deps()
        return ret

    def _get_gir_targets_inc_dirs(self, girtargets: T.List[build.BuildTarget]) -> T.List[build.IncludeDirs]:
        ret: T.List[build.IncludeDirs] = []
        for girtarget in girtargets:
            ret += girtarget.get_include_dirs()
        return ret

    def _get_langs_compilers_flags(self, state: 'ModuleState', langs_compilers: T.List[T.Tuple[str, 'Compiler']]
                                   ) -> T.Tuple[T.List[str], T.List[str], T.List[str]]:
        cflags: T.List[str] = []
        internal_ldflags: T.List[str] = []
        external_ldflags: T.List[str] = []

        for lang, compiler in langs_compilers:
            if state.global_args.get(lang):
                cflags += state.global_args[lang]
            if state.project_args.get(lang):
                cflags += state.project_args[lang]
            if mesonlib.OptionKey('b_sanitize') in compiler.base_options:
                sanitize = state.environment.coredata.options[mesonlib.OptionKey('b_sanitize')].value
                cflags += compiler.sanitizer_compile_args(sanitize)
                sanitize = sanitize.split(',')
                # These must be first in ldflags
                if 'address' in sanitize:
                    internal_ldflags += ['-lasan']
                if 'thread' in sanitize:
                    internal_ldflags += ['-ltsan']
                if 'undefined' in sanitize:
                    internal_ldflags += ['-lubsan']
                # FIXME: Linking directly to lib*san is not recommended but g-ir-scanner
                # does not understand -f LDFLAGS. https://bugzilla.gnome.org/show_bug.cgi?id=783892
                # ldflags += compiler.sanitizer_link_args(sanitize)

        return cflags, internal_ldflags, external_ldflags

    def _make_gir_filelist(self, state: 'ModuleState', srcdir: str, ns: str,
                           nsversion: str, girtargets: T.List[build.BuildTarget],
                           libsources: T.Sequence[T.Union[
                               str, mesonlib.File, build.GeneratedList,
                               build.CustomTarget, build.CustomTargetIndex]]
                            ) -> str:
        gir_filelist_dir = state.backend.get_target_private_dir_abs(girtargets[0])
        if not os.path.isdir(gir_filelist_dir):
            os.mkdir(gir_filelist_dir)
        gir_filelist_filename = os.path.join(gir_filelist_dir, f'{ns}_{nsversion}_gir_filelist')

        with open(gir_filelist_filename, 'w', encoding='utf-8') as gir_filelist:
            for s in libsources:
                if isinstance(s, (build.CustomTarget, build.CustomTargetIndex)):
                    for custom_output in s.get_outputs():
                        gir_filelist.write(os.path.join(state.environment.get_build_dir(),
                                                        state.backend.get_target_dir(s),
                                                        custom_output) + '\n')
                elif isinstance(s, mesonlib.File):
                    gir_filelist.write(s.rel_to_builddir(state.build_to_src) + '\n')
                elif isinstance(s, build.GeneratedList):
                    for gen_src in s.get_outputs():
                        gir_filelist.write(os.path.join(srcdir, gen_src) + '\n')
                else:
                    gir_filelist.write(os.path.join(srcdir, s) + '\n')

        return gir_filelist_filename

    def _make_gir_target(self, state: 'ModuleState', girfile: str, scan_command: T.List[str],
                         generated_files: T.Sequence[T.Union[str, mesonlib.File, build.CustomTarget, build.CustomTargetIndex, build.GeneratedList]],
                         depends: T.List[build.Target], kwargs: T.Dict[str, T.Any]) -> GirTarget:
        scankwargs = {'input': generated_files,
                      'output': girfile,
                      'command': scan_command,
                      'depends': depends}

        if 'install' in kwargs:
            scankwargs['install'] = kwargs['install']
            scankwargs['install_dir'] = kwargs.get('install_dir_gir',
                                                   os.path.join(state.environment.get_datadir(), 'gir-1.0'))
            scankwargs['install_tag'] = 'devel'

        if 'build_by_default' in kwargs:
            scankwargs['build_by_default'] = kwargs['build_by_default']

        return GirTarget(girfile, state.subdir, state.subproject, scankwargs)

    def _make_typelib_target(self, state: 'ModuleState', typelib_output: str, typelib_cmd: T.List[str],
                             generated_files: T.Sequence[T.Union[str, mesonlib.File, build.CustomTarget, build.CustomTargetIndex, build.GeneratedList]],
                             kwargs: T.Dict[str, T.Any]) -> TypelibTarget:
        typelib_kwargs = {
            'input': generated_files,
            'output': [typelib_output],
            'command': typelib_cmd,
        }

        if 'install' in kwargs:
            typelib_kwargs['install'] = kwargs['install']
            typelib_kwargs['install_dir'] = kwargs.get('install_dir_typelib',
                                                       os.path.join(state.environment.get_libdir(), 'girepository-1.0'))
            typelib_kwargs['install_tag'] = 'typelib'

        if 'build_by_default' in kwargs:
            typelib_kwargs['build_by_default'] = kwargs['build_by_default']

        return TypelibTarget(typelib_output, state.subdir, state.subproject, typelib_kwargs)

    # May mutate depends
    def _gather_typelib_includes_and_update_depends(self, state: 'ModuleState', deps: T.List[Dependency], depends: T.List[build.Target]) -> T.List[str]:
        # Need to recursively add deps on GirTarget sources from our
        # dependencies and also find the include directories needed for the
        # typelib generation custom target below.
        typelib_includes: T.List[str] = []
        for dep in deps:
            # Add a dependency on each GirTarget listed in dependencies and add
            # the directory where it will be generated to the typelib includes
            if isinstance(dep, InternalDependency):
                for source in dep.sources:
                    if isinstance(source, GirTarget) and source not in depends:
                        depends.append(source)
                        subdir = os.path.join(state.environment.get_build_dir(),
                                              source.get_subdir())
                        if subdir not in typelib_includes:
                            typelib_includes.append(subdir)
            # Do the same, but for dependencies of dependencies. These are
            # stored in the list of generated sources for each link dep (from
            # girtarget.get_all_link_deps() above).
            # FIXME: Store this in the original form from declare_dependency()
            # so it can be used here directly.
            elif isinstance(dep, build.SharedLibrary):
                for source in dep.generated:
                    if isinstance(source, GirTarget):
                        subdir = os.path.join(state.environment.get_build_dir(),
                                              source.get_subdir())
                        if subdir not in typelib_includes:
                            typelib_includes.append(subdir)
            if isinstance(dep, Dependency):
                girdir = dep.get_variable(pkgconfig='girdir', internal='girdir', default_value='')
                assert isinstance(girdir, str), 'for mypy'
                if girdir and girdir not in typelib_includes:
                    typelib_includes.append(girdir)
        return typelib_includes

    def _get_external_args_for_langs(self, state: 'ModuleState', langs: T.Sequence[str]) -> T.List[str]:
        ret: T.List[str] = []
        for lang in langs:
            ret += mesonlib.listify(state.environment.coredata.get_external_args(MachineChoice.HOST, lang))
        return ret

    @staticmethod
    def _get_scanner_cflags(cflags: T.Iterable[str]) -> T.Iterable[str]:
        'g-ir-scanner only accepts -I/-D/-U; must ignore all other flags'
        for f in cflags:
            # _FORTIFY_SOURCE depends on / works together with -O, on the other hand this
            # just invokes the preprocessor anyway
            if f.startswith(('-D', '-U', '-I')) and not f.startswith('-D_FORTIFY_SOURCE'):
                yield f

    @staticmethod
    def _get_scanner_ldflags(ldflags: T.Iterable[str]) -> T.Iterable[str]:
        'g-ir-scanner only accepts -L/-l; must ignore -F and other linker flags'
        for f in ldflags:
            if f.startswith(('-L', '-l', '--extra-library')):
                yield f

    @FeatureNewKwargs('generate_gir', '0.55.0', ['fatal_warnings'])
    @FeatureNewKwargs('generate_gir', '0.40.0', ['build_by_default'])
    @permittedKwargs({'sources', 'nsversion', 'namespace', 'symbol_prefix', 'identifier_prefix',
                      'export_packages', 'includes', 'dependencies', 'link_with', 'include_directories',
                      'install', 'install_dir_gir', 'install_dir_typelib', 'extra_args',
                      'packages', 'header', 'build_by_default', 'fatal_warnings'})
    @typed_pos_args('gnome.generate_gir', varargs=(build.Executable, build.SharedLibrary, build.StaticLibrary), min_varargs=1)
    def generate_gir(self, state: 'ModuleState', args: T.Tuple[T.List[T.Union[build.Executable, build.SharedLibrary, build.StaticLibrary]]],
                     kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
        if kwargs.get('install_dir'):
            raise MesonException('install_dir is not supported with generate_gir(), see "install_dir_gir" and "install_dir_typelib"')

        girtargets = [self._unwrap_gir_target(arg, state) for arg in args[0]]

        if len(girtargets) > 1 and any([isinstance(el, build.Executable) for el in girtargets]):
            raise MesonException('generate_gir only accepts a single argument when one of the arguments is an executable')

        gir_dep, giscanner, gicompiler = self._get_gir_dep(state)

        ns = kwargs.get('namespace')
        if not ns:
            raise MesonException('Missing "namespace" keyword argument')
        nsversion = kwargs.get('nsversion')
        if not nsversion:
            raise MesonException('Missing "nsversion" keyword argument')
        libsources = mesonlib.extract_as_list(kwargs, 'sources', pop=True)
        girfile = f'{ns}-{nsversion}.gir'
        srcdir = os.path.join(state.environment.get_source_dir(), state.subdir)
        builddir = os.path.join(state.environment.get_build_dir(), state.subdir)
        depends = gir_dep.sources + girtargets
        gir_inc_dirs = []
        langs_compilers = self._get_girtargets_langs_compilers(girtargets)
        cflags, internal_ldflags, external_ldflags = self._get_langs_compilers_flags(state, langs_compilers)
        deps = self._get_gir_targets_deps(girtargets)
        deps += extract_as_list(kwargs, 'dependencies', pop=True)
        deps += [gir_dep]
        typelib_includes = self._gather_typelib_includes_and_update_depends(state, deps, depends)
        # ldflags will be misinterpreted by gir scanner (showing
        # spurious dependencies) but building GStreamer fails if they
        # are not used here.
        dep_cflags, dep_internal_ldflags, dep_external_ldflags, _, gi_includes = \
            self._get_dependencies_flags(deps, state, depends, use_gir_args=True)
        scan_cflags = []
        scan_cflags += list(self._get_scanner_cflags(cflags))
        scan_cflags += list(self._get_scanner_cflags(dep_cflags))
        scan_cflags += list(self._get_scanner_cflags(self._get_external_args_for_langs(state, [lc[0] for lc in langs_compilers])))
        scan_internal_ldflags = []
        scan_internal_ldflags += list(self._get_scanner_ldflags(internal_ldflags))
        scan_internal_ldflags += list(self._get_scanner_ldflags(dep_internal_ldflags))
        scan_external_ldflags = []
        scan_external_ldflags += list(self._get_scanner_ldflags(external_ldflags))
        scan_external_ldflags += list(self._get_scanner_ldflags(dep_external_ldflags))
        girtargets_inc_dirs = self._get_gir_targets_inc_dirs(girtargets)
        inc_dirs = self._scan_inc_dirs(kwargs)

        scan_command = [giscanner]
        scan_command += ['--no-libtool']
        scan_command += ['--namespace=' + ns, '--nsversion=' + nsversion]
        scan_command += ['--warn-all']
        scan_command += ['--output', '@OUTPUT@']
        scan_command += self._scan_header(kwargs)
        scan_command += self._scan_extra_args(kwargs)
        scan_command += ['-I' + srcdir, '-I' + builddir]
        scan_command += state.get_include_args(girtargets_inc_dirs)
        scan_command += ['--filelist=' + self._make_gir_filelist(state, srcdir, ns, nsversion, girtargets, libsources)]
        scan_command += self._scan_link_withs(state, depends, kwargs)
        scan_command += self._scan_include(state, depends, gir_inc_dirs, kwargs)
        scan_command += self._scan_symbol_prefix(kwargs)
        scan_command += self._scan_identifier_prefix(kwargs)
        scan_command += self._scan_export_packages(kwargs)
        scan_command += ['--cflags-begin']
        scan_command += scan_cflags
        scan_command += ['--cflags-end']
        scan_command += state.get_include_args(inc_dirs)
        scan_command += state.get_include_args(list(gi_includes) + gir_inc_dirs + inc_dirs, prefix='--add-include-path=')
        scan_command += list(scan_internal_ldflags)
        scan_command += self._scan_gir_targets(state, girtargets)
        scan_command += self._scan_langs(state, [lc[0] for lc in langs_compilers])
        scan_command += list(scan_external_ldflags)

        if self._gir_has_option('--sources-top-dirs'):
            scan_command += ['--sources-top-dirs', os.path.join(state.environment.get_source_dir(), self.interpreter.subproject_dir, state.subproject)]
            scan_command += ['--sources-top-dirs', os.path.join(state.environment.get_build_dir(), self.interpreter.subproject_dir, state.subproject)]

        if '--warn-error' in scan_command:
            mlog.deprecation('Passing --warn-error is deprecated in favor of "fatal_warnings" keyword argument since v0.55')
        fatal_warnings = kwargs.get('fatal_warnings', False)
        if not isinstance(fatal_warnings, bool):
            raise MesonException('fatal_warnings keyword argument must be a boolean')
        if fatal_warnings:
            scan_command.append('--warn-error')

        generated_files = [f for f in libsources if isinstance(f, (GeneratedList, CustomTarget, CustomTargetIndex))]

        scan_target = self._make_gir_target(state, girfile, scan_command, generated_files, depends, kwargs)

        typelib_output = f'{ns}-{nsversion}.typelib'
        typelib_cmd = [gicompiler, scan_target, '--output', '@OUTPUT@']
        typelib_cmd += state.get_include_args(gir_inc_dirs, prefix='--includedir=')

        for incdir in typelib_includes:
            typelib_cmd += ["--includedir=" + incdir]

        typelib_target = self._make_typelib_target(state, typelib_output, typelib_cmd, generated_files, kwargs)

        self._devenv_prepend('GI_TYPELIB_PATH', os.path.join(state.environment.get_build_dir(), state.subdir))

        rv = [scan_target, typelib_target]

        return ModuleReturnValue(rv, rv)

    @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
    @permittedKwargs({'build_by_default', 'depend_files'})
    @noPosargs
    def compile_schemas(self, state: 'ModuleState', args: T.List['TYPE_var'], kwargs) -> ModuleReturnValue:
        srcdir = os.path.join(state.build_to_src, state.subdir)
        outdir = state.subdir

        cmd = [state.find_program('glib-compile-schemas')]
        cmd += ['--targetdir', outdir, srcdir]
        kwargs['command'] = cmd
        kwargs['input'] = []
        kwargs['output'] = 'gschemas.compiled'
        if state.subdir == '':
            targetname = 'gsettings-compile'
        else:
            targetname = 'gsettings-compile-' + state.subdir.replace('/', '_')
        target_g = build.CustomTarget(targetname, state.subdir, state.subproject, kwargs)
        self._devenv_prepend('GSETTINGS_SCHEMA_DIR', os.path.join(state.environment.get_build_dir(), state.subdir))
        return ModuleReturnValue(target_g, [target_g])

    @permittedKwargs({'sources', 'media', 'symlink_media', 'languages'})
    @FeatureDeprecatedKwargs('gnome.yelp', '0.43.0', ['languages'],
                             'Use a LINGUAS file in the source directory instead')
    @typed_pos_args('gnome.yelp', str, varargs=str)
    def yelp(self, state: 'ModuleState', args: T.Tuple[str, T.List[str]], kwargs) -> ModuleReturnValue:
        project_id = args[0]
        if len(args) > 1:
            FeatureDeprecated.single_use('gnome.yelp more than one positional argument', '0.60.0', 'use the "sources" keyword argument instead.')

        sources = mesonlib.stringlistify(kwargs.pop('sources', []))
        if not sources:
            sources = args[1]
            if not sources:
                raise MesonException('Yelp requires a list of sources')
        else:
            if len(args) > 1:
                mlog.warning('"gnome.yelp" ignores positional sources arguments when the "sources" keyword argument is set')
        source_str = '@@'.join(sources)

        langs = mesonlib.stringlistify(kwargs.pop('languages', []))
        media = mesonlib.stringlistify(kwargs.pop('media', []))
        symlinks = kwargs.pop('symlink_media', True)

        if not isinstance(symlinks, bool):
            raise MesonException('symlink_media must be a boolean')

        if kwargs:
            raise MesonException('Unknown arguments passed: {}'.format(', '.join(kwargs.keys())))

        script = state.environment.get_build_command()
        args = ['--internal',
                'yelphelper',
                'install',
                '--subdir=' + state.subdir,
                '--id=' + project_id,
                '--installdir=' + os.path.join(state.environment.get_datadir(), 'help'),
                '--sources=' + source_str]
        if symlinks:
            args.append('--symlinks=true')
        if media:
            args.append('--media=' + '@@'.join(media))
        if langs:
            args.append('--langs=' + '@@'.join(langs))
        inscript = state.backend.get_executable_serialisation(script + args)

        potargs = state.environment.get_build_command() + [
            '--internal', 'yelphelper', 'pot',
            '--subdir=' + state.subdir,
            '--id=' + project_id,
            '--sources=' + source_str,
        ]
        pottarget = build.RunTarget('help-' + project_id + '-pot', potargs,
                                    [], state.subdir, state.subproject)

        poargs = state.environment.get_build_command() + [
            '--internal', 'yelphelper', 'update-po',
            '--subdir=' + state.subdir,
            '--id=' + project_id,
            '--sources=' + source_str,
            '--langs=' + '@@'.join(langs),
        ]
        potarget = build.RunTarget('help-' + project_id + '-update-po', poargs,
                                   [], state.subdir, state.subproject)

        rv = [inscript, pottarget, potarget]
        return ModuleReturnValue(None, rv)

    @FeatureNewKwargs('gnome.gtkdoc', '0.52.0', ['check'])
    @FeatureNewKwargs('gnome.gtkdoc', '0.48.0', ['c_args'])
    @FeatureNewKwargs('gnome.gtkdoc', '0.48.0', ['module_version'])
    @FeatureNewKwargs('gnome.gtkdoc', '0.37.0', ['namespace', 'mode'])
    @permittedKwargs({'main_xml', 'main_sgml', 'src_dir', 'dependencies', 'install',
                      'install_dir', 'scan_args', 'scanobjs_args', 'gobject_typesfile',
                      'fixxref_args', 'html_args', 'html_assets', 'content_files',
                      'mkdb_args', 'ignore_headers', 'include_directories',
                      'namespace', 'mode', 'expand_content_files', 'module_version',
                      'c_args', 'check'})
    @typed_pos_args('gnome.gtkdoc', str)
    def gtkdoc(self, state: 'ModuleState', args: T.Tuple[str], kwargs):
        modulename = args[0]
        if 'src_dir' not in kwargs:
            raise MesonException('Keyword argument src_dir missing.')
        main_file = kwargs.get('main_sgml', '')
        if not isinstance(main_file, str):
            raise MesonException('Main sgml keyword argument must be a string.')
        main_xml = kwargs.get('main_xml', '')
        if not isinstance(main_xml, str):
            raise MesonException('Main xml keyword argument must be a string.')
        moduleversion = kwargs.get('module_version', '')
        if not isinstance(moduleversion, str):
            raise MesonException('Module version keyword argument must be a string.')
        if main_xml != '':
            if main_file != '':
                raise MesonException('You can only specify main_xml or main_sgml, not both.')
            main_file = main_xml
        targetname = modulename + ('-' + moduleversion if moduleversion else '') + '-doc'
        command = state.environment.get_build_command()

        namespace = kwargs.get('namespace', '')
        mode = kwargs.get('mode', 'auto')
        VALID_MODES = ('xml', 'sgml', 'none', 'auto')
        if mode not in VALID_MODES:
            raise MesonException(f'gtkdoc: Mode {mode} is not a valid mode: {VALID_MODES}')

        src_dirs = mesonlib.extract_as_list(kwargs, 'src_dir')
        header_dirs = []
        for src_dir in src_dirs:
            if isinstance(src_dir, HoldableObject):
                if not isinstance(src_dir, build.IncludeDirs):
                    raise MesonException('Invalid keyword argument for src_dir.')
                for inc_dir in src_dir.get_incdirs():
                    header_dirs.append(os.path.join(state.environment.get_source_dir(),
                                                    src_dir.get_curdir(), inc_dir))
                    header_dirs.append(os.path.join(state.environment.get_build_dir(),
                                                    src_dir.get_curdir(), inc_dir))
            else:
                header_dirs.append(src_dir)

        args = ['--internal', 'gtkdoc',
                '--sourcedir=' + state.environment.get_source_dir(),
                '--builddir=' + state.environment.get_build_dir(),
                '--subdir=' + state.subdir,
                '--headerdirs=' + '@@'.join(header_dirs),
                '--mainfile=' + main_file,
                '--modulename=' + modulename,
                '--moduleversion=' + moduleversion,
                '--mode=' + mode]
        for tool in ['scan', 'scangobj', 'mkdb', 'mkhtml', 'fixxref']:
            program_name = 'gtkdoc-' + tool
            program = state.find_program(program_name)
            path = program.get_path()
            args.append(f'--{program_name}={path}')
        if namespace:
            args.append('--namespace=' + namespace)
        args += self._unpack_args('--htmlargs=', 'html_args', kwargs)
        args += self._unpack_args('--scanargs=', 'scan_args', kwargs)
        args += self._unpack_args('--scanobjsargs=', 'scanobjs_args', kwargs)
        args += self._unpack_args('--gobjects-types-file=', 'gobject_typesfile', kwargs, state)
        args += self._unpack_args('--fixxrefargs=', 'fixxref_args', kwargs)
        args += self._unpack_args('--mkdbargs=', 'mkdb_args', kwargs)
        args += self._unpack_args('--html-assets=', 'html_assets', kwargs, state)

        depends = []
        content_files = []
        for s in mesonlib.extract_as_list(kwargs, 'content_files'):
            if isinstance(s, (build.CustomTarget, build.CustomTargetIndex)):
                depends.append(s)
                for o in s.get_outputs():
                    content_files.append(os.path.join(state.environment.get_build_dir(),
                                                      state.backend.get_target_dir(s),
                                                      o))
            elif isinstance(s, mesonlib.File):
                content_files.append(s.absolute_path(state.environment.get_source_dir(),
                                                     state.environment.get_build_dir()))
            elif isinstance(s, build.GeneratedList):
                depends.append(s)
                for gen_src in s.get_outputs():
                    content_files.append(os.path.join(state.environment.get_source_dir(),
                                                      state.subdir,
                                                      gen_src))
            elif isinstance(s, str):
                content_files.append(os.path.join(state.environment.get_source_dir(),
                                                  state.subdir,
                                                  s))
            else:
                raise MesonException(
                    f'Invalid object type: {s.__class__.__name__!r}')
        args += ['--content-files=' + '@@'.join(content_files)]

        args += self._unpack_args('--expand-content-files=', 'expand_content_files', kwargs, state)
        args += self._unpack_args('--ignore-headers=', 'ignore_headers', kwargs)
        args += self._unpack_args('--installdir=', 'install_dir', kwargs)
        args += self._get_build_args(kwargs, state, depends)
        custom_kwargs = {'output': modulename + '-decl.txt',
                         'command': command + args,
                         'depends': depends,
                         'build_always_stale': True,
                         }
        custom_target = build.CustomTarget(targetname, state.subdir, state.subproject, custom_kwargs)
        alias_target = build.AliasTarget(targetname, [custom_target], state.subdir, state.subproject)
        if kwargs.get('check', False):
            check_cmd = state.find_program('gtkdoc-check')
            check_env = ['DOC_MODULE=' + modulename,
                         'DOC_MAIN_SGML_FILE=' + main_file]
            check_args = [targetname + '-check', check_cmd]
            check_workdir = os.path.join(state.environment.get_build_dir(), state.subdir)
            state.test(check_args, env=check_env, workdir=check_workdir, depends=custom_target)
        res = [custom_target, alias_target]
        if kwargs.get('install', True):
            res.append(state.backend.get_executable_serialisation(command + args, tag='doc'))
        return ModuleReturnValue(custom_target, res)

    def _get_build_args(self, kwargs: T.Dict[str, T.Any], state: 'ModuleState', depends: T.List[build.BuildTarget]) -> T.List[str]:
        args: T.List[str] = []
        deps = extract_as_list(kwargs, 'dependencies')
        cflags: T.List[str] = []
        cflags.extend(mesonlib.stringlistify(kwargs.pop('c_args', [])))
        deps_cflags, internal_ldflags, external_ldflags, *_ = \
            self._get_dependencies_flags(deps, state, depends, include_rpath=True)
        inc_dirs = mesonlib.extract_as_list(kwargs, 'include_directories')
        for incd in inc_dirs:
            if not isinstance(incd, (str, build.IncludeDirs)):
                raise MesonException(
                    'Gir include dirs should be include_directories().')

        cflags.extend(deps_cflags)
        cflags.extend(state.get_include_args(inc_dirs))
        ldflags: T.List[str] = []
        ldflags.extend(internal_ldflags)
        ldflags.extend(external_ldflags)

        cflags.extend(state.environment.coredata.get_external_args(MachineChoice.HOST, 'c'))
        ldflags.extend(state.environment.coredata.get_external_link_args(MachineChoice.HOST, 'c'))
        compiler = state.environment.coredata.compilers[MachineChoice.HOST]['c']

        compiler_flags = self._get_langs_compilers_flags(state, [('c', compiler)])
        cflags.extend(compiler_flags[0])
        ldflags.extend(compiler_flags[1])
        ldflags.extend(compiler_flags[2])
        if compiler:
            args += ['--cc=%s' % join_args(compiler.get_exelist())]
            args += ['--ld=%s' % join_args(compiler.get_linker_exelist())]
        if cflags:
            args += ['--cflags=%s' % join_args(cflags)]
        if ldflags:
            args += ['--ldflags=%s' % join_args(ldflags)]

        return args

    @noKwargs
    @typed_pos_args('gnome.gtkdoc_html_dir', str)
    def gtkdoc_html_dir(self, state: 'ModuleState', args: T.Tuple[str], kwargs: 'TYPE_kwargs') -> str:
        return os.path.join('share/gtk-doc/html', args[0])

    @staticmethod
    def _unpack_args(arg, kwarg_name: str, kwargs: T.Dict[str, T.Any], expend_file_state: T.Optional['ModuleState'] = None) -> T.List[str]:
        if kwarg_name not in kwargs:
            return []

        new_args = mesonlib.extract_as_list(kwargs, kwarg_name)
        args = []
        for i in new_args:
            if expend_file_state is not None:
                if isinstance(i, mesonlib.File):
                    i = i.absolute_path(expend_file_state.environment.get_source_dir(), expend_file_state.environment.get_build_dir())
                elif isinstance(i, str):
                    i = os.path.join(expend_file_state.environment.get_source_dir(), expend_file_state.subdir, i)
            elif not isinstance(i, str):
                raise MesonException(kwarg_name + ' values must be strings.')
            args.append(i)

        if args:
            return [arg + '@@'.join(args)]

        return []

    def _get_autocleanup_args(self, kwargs: T.Dict[str, T.Any], glib_version: str) -> T.List[str]:
        if not mesonlib.version_compare(glib_version, '>= 2.49.1'):
            # Warn if requested, silently disable if not
            if 'autocleanup' in kwargs:
                mlog.warning(f'Glib version ({glib_version}) is too old to support the \'autocleanup\' '
                             'kwarg, need 2.49.1 or newer')
            return []
        autocleanup = kwargs.pop('autocleanup', 'all')
        values = ('none', 'objects', 'all')
        if autocleanup not in values:
            raise MesonException('gdbus_codegen does not support {!r} as an autocleanup value, '
                                 'must be one of: {!r}'.format(autocleanup, ', '.join(values)))
        return ['--c-generate-autocleanup', autocleanup]

    @FeatureNewKwargs('build target', '0.46.0', ['install_header', 'install_dir', 'sources'])
    @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
    @FeatureNewKwargs('build target', '0.47.0', ['extra_args', 'autocleanup'])
    @permittedKwargs({'interface_prefix', 'namespace', 'extra_args', 'autocleanup', 'object_manager', 'build_by_default',
                      'annotations', 'docbook', 'install_header', 'install_dir', 'sources'})
    @typed_pos_args('gnome.gdbus_codegen', str, optargs=[str])
    def gdbus_codegen(self, state: 'ModuleState', args: T.Tuple[str, T.Optional[str]], kwargs) -> ModuleReturnValue:
        namebase = args[0]
        xml_files: T.List[str] = [args[1]] if args[1] else []
        cmd = [state.find_program('gdbus-codegen')]
        extra_args = mesonlib.stringlistify(kwargs.pop('extra_args', []))
        cmd += extra_args
        # Autocleanup supported?
        glib_version = self._get_native_glib_version(state)
        cmd += self._get_autocleanup_args(kwargs, glib_version)
        if 'interface_prefix' in kwargs:
            cmd += ['--interface-prefix', kwargs.pop('interface_prefix')]
        if 'namespace' in kwargs:
            cmd += ['--c-namespace', kwargs.pop('namespace')]
        if kwargs.get('object_manager', False):
            cmd += ['--c-generate-object-manager']
        if 'sources' in kwargs:
            xml_files += mesonlib.listify(kwargs.pop('sources'))
        build_by_default = kwargs.get('build_by_default', False)

        # Annotations are a bit ugly in that they are a list of lists of strings...
        annotations = kwargs.pop('annotations', [])
        if not isinstance(annotations, list):
            raise MesonException('annotations takes a list')
        if annotations and isinstance(annotations, list) and not isinstance(annotations[0], list):
            annotations = [annotations]

        for annotation in annotations:
            if len(annotation) != 3 or not all(isinstance(i, str) for i in annotation):
                raise MesonException('Annotations must be made up of 3 strings for ELEMENT, KEY, and VALUE')
            cmd += ['--annotate'] + annotation

        targets = []
        install_header = kwargs.get('install_header', False)
        install_dir = kwargs.get('install_dir', state.environment.coredata.get_option(mesonlib.OptionKey('includedir')))

        output = namebase + '.c'
        # Added in https://gitlab.gnome.org/GNOME/glib/commit/e4d68c7b3e8b01ab1a4231bf6da21d045cb5a816 (2.55.2)
        # Fixed in https://gitlab.gnome.org/GNOME/glib/commit/cd1f82d8fc741a2203582c12cc21b4dacf7e1872 (2.56.2)
        if mesonlib.version_compare(glib_version, '>= 2.56.2'):
            custom_kwargs = {'input': xml_files,
                             'output': output,
                             'command': cmd + ['--body', '--output', '@OUTPUT@', '@INPUT@'],
                             'build_by_default': build_by_default
                             }
        else:
            if 'docbook' in kwargs:
                docbook = kwargs['docbook']
                if not isinstance(docbook, str):
                    raise MesonException('docbook value must be a string.')

                cmd += ['--generate-docbook', docbook]

            # https://git.gnome.org/browse/glib/commit/?id=ee09bb704fe9ccb24d92dd86696a0e6bb8f0dc1a
            if mesonlib.version_compare(glib_version, '>= 2.51.3'):
                cmd += ['--output-directory', '@OUTDIR@', '--generate-c-code', namebase, '@INPUT@']
            else:
                self._print_gdbus_warning()
                cmd += ['--generate-c-code', '@OUTDIR@/' + namebase, '@INPUT@']

            custom_kwargs = {'input': xml_files,
                             'output': output,
                             'command': cmd,
                             'build_by_default': build_by_default
                             }

        cfile_custom_target = build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs)
        targets.append(cfile_custom_target)

        output = namebase + '.h'
        if mesonlib.version_compare(glib_version, '>= 2.56.2'):
            custom_kwargs = {'input': xml_files,
                             'output': output,
                             'command': cmd + ['--header', '--output', '@OUTPUT@', '@INPUT@'],
                             'build_by_default': build_by_default,
                             'install': install_header,
                             'install_dir': install_dir
                             }
        else:
            custom_kwargs = {'input': xml_files,
                             'output': output,
                             'command': cmd,
                             'build_by_default': build_by_default,
                             'install': install_header,
                             'install_dir': install_dir,
                             'depends': cfile_custom_target
                             }

        hfile_custom_target = build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs)
        targets.append(hfile_custom_target)

        if 'docbook' in kwargs:
            docbook = kwargs['docbook']
            if not isinstance(docbook, str):
                raise MesonException('docbook value must be a string.')

            docbook_cmd = cmd + ['--output-directory', '@OUTDIR@', '--generate-docbook', docbook, '@INPUT@']

            # The docbook output is always ${docbook}-${name_of_xml_file}
            output = namebase + '-docbook'
            outputs = []
            for f in xml_files:
                outputs.append('{}-{}'.format(docbook, os.path.basename(str(f))))

            if mesonlib.version_compare(glib_version, '>= 2.56.2'):
                custom_kwargs = {'input': xml_files,
                                 'output': outputs,
                                 'command': docbook_cmd,
                                 'build_by_default': build_by_default
                                 }
            else:
                custom_kwargs = {'input': xml_files,
                                 'output': outputs,
                                 'command': cmd,
                                 'build_by_default': build_by_default,
                                 'depends': cfile_custom_target
                                 }

            docbook_custom_target = build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs)
            targets.append(docbook_custom_target)

        return ModuleReturnValue(targets, targets)

    @permittedKwargs({'sources', 'c_template', 'h_template', 'install_header', 'install_dir',
                      'comments', 'identifier_prefix', 'symbol_prefix', 'eprod', 'vprod',
                      'fhead', 'fprod', 'ftail', 'vhead', 'vtail', 'depends'})
    @typed_pos_args('gnome.mkenums', str)
    def mkenums(self, state: 'ModuleState', args: T.Tuple[str], kwargs) -> ModuleReturnValue:
        basename = args[0]

        if 'sources' not in kwargs:
            raise MesonException('Missing keyword argument "sources".')
        sources = kwargs.pop('sources')
        if isinstance(sources, str):
            sources = [sources]
        elif not isinstance(sources, list):
            raise MesonException(
                'Sources keyword argument must be a string or array.')

        cmd = []
        known_kwargs = ['comments', 'eprod', 'fhead', 'fprod', 'ftail',
                        'identifier_prefix', 'symbol_prefix', 'template',
                        'vhead', 'vprod', 'vtail']
        known_custom_target_kwargs = ['install_dir', 'build_always',
                                      'depends', 'depend_files']
        c_template = h_template = None
        install_header = False
        for arg, value in kwargs.items():
            if arg == 'sources':
                raise AssertionError("sources should've already been handled")
            elif arg == 'c_template':
                c_template = value
                if isinstance(c_template, mesonlib.File):
                    c_template = c_template.absolute_path(state.environment.source_dir, state.environment.build_dir)
                if 'template' in kwargs:
                    raise MesonException('Mkenums does not accept both '
                                         'c_template and template keyword '
                                         'arguments at the same time.')
            elif arg == 'h_template':
                h_template = value
                if isinstance(h_template, mesonlib.File):
                    h_template = h_template.absolute_path(state.environment.source_dir, state.environment.build_dir)
                if 'template' in kwargs:
                    raise MesonException('Mkenums does not accept both '
                                         'h_template and template keyword '
                                         'arguments at the same time.')
            elif arg == 'install_header':
                install_header = value
            elif arg in known_kwargs:
                cmd += ['--' + arg.replace('_', '-'), value]
            elif arg not in known_custom_target_kwargs:
                raise MesonException(
                    f'Mkenums does not take a {arg} keyword argument.')
        cmd = [state.find_program(['glib-mkenums', 'mkenums'])] + cmd
        custom_kwargs = {}
        for arg in known_custom_target_kwargs:
            if arg in kwargs:
                custom_kwargs[arg] = kwargs[arg]

        targets = []

        if h_template is not None:
            h_output = os.path.basename(os.path.splitext(h_template)[0])
            # We always set template as the first element in the source array
            # so --template consumes it.
            h_cmd = cmd + ['--template', '@INPUT@']
            h_sources = [h_template] + sources

            # Copy so we don't mutate the arguments for the c_template
            h_kwargs = custom_kwargs.copy()
            h_kwargs['install'] = install_header
            if 'install_dir' not in h_kwargs:
                h_kwargs['install_dir'] = \
                    state.environment.coredata.get_option(mesonlib.OptionKey('includedir'))
            h_target = self._make_mkenum_custom_target(state, h_sources,
                                                       h_output, h_cmd,
                                                       h_kwargs)
            targets.append(h_target)

        if c_template is not None:
            c_output = os.path.basename(os.path.splitext(c_template)[0])
            # We always set template as the first element in the source array
            # so --template consumes it.
            c_cmd = cmd + ['--template', '@INPUT@']
            c_sources = [c_template] + sources

            c_kwargs = custom_kwargs.copy()
            # Never install the C file. Complain on bug tracker if you need it.
            c_kwargs['install'] = False
            c_kwargs['install_dir'] = []
            if h_template is not None:
                if 'depends' in custom_kwargs:
                    c_kwargs['depends'] += [h_target]
                else:
                    c_kwargs['depends'] = h_target
            c_target = self._make_mkenum_custom_target(state, c_sources,
                                                       c_output, c_cmd,
                                                       c_kwargs)
            targets.insert(0, c_target)

        if c_template is None and h_template is None:
            generic_cmd = cmd + ['@INPUT@']
            custom_kwargs['install'] = install_header
            if 'install_dir' not in custom_kwargs:
                custom_kwargs['install_dir'] = \
                    state.environment.coredata.get_option(mesonlib.OptionKey('includedir'))
            target = self._make_mkenum_custom_target(state, sources, basename,
                                                     generic_cmd, custom_kwargs)
            return ModuleReturnValue(target, [target])
        elif len(targets) == 1:
            return ModuleReturnValue(targets[0], [targets[0]])
        else:
            return ModuleReturnValue(targets, targets)

    @FeatureNew('gnome.mkenums_simple', '0.42.0')
    @typed_pos_args('gnome.mkenums_simple', str)
    def mkenums_simple(self, state: 'ModuleState', args: T.Tuple[str], kwargs) -> ModuleReturnValue:
        hdr_filename = f'{args[0]}.h'
        body_filename = f'{args[0]}.c'

        # not really needed, just for sanity checking
        forbidden_kwargs = ['c_template', 'h_template', 'eprod', 'fhead',
                            'fprod', 'ftail', 'vhead', 'vtail', 'comments']
        for arg in forbidden_kwargs:
            if arg in kwargs:
                raise MesonException(f'mkenums_simple() does not take a {arg} keyword argument')

        # kwargs to pass as-is from mkenums_simple() to mkenums()
        shared_kwargs = ['sources', 'install_header', 'install_dir',
                         'identifier_prefix', 'symbol_prefix']
        mkenums_kwargs = {}
        for arg in shared_kwargs:
            if arg in kwargs:
                mkenums_kwargs[arg] = kwargs[arg]

        # .c file generation
        c_file_kwargs = copy.deepcopy(mkenums_kwargs)
        if 'sources' not in kwargs:
            raise MesonException('Missing keyword argument "sources".')
        sources = kwargs['sources']
        if isinstance(sources, str):
            sources = [sources]
        elif not isinstance(sources, list):
            raise MesonException(
                'Sources keyword argument must be a string or array.')

        # The `install_header` argument will be used by mkenums() when
        # not using template files, so we need to forcibly unset it
        # when generating the C source file, otherwise we will end up
        # installing it
        c_file_kwargs['install_header'] = False

        header_prefix = kwargs.get('header_prefix', '')
        decl_decorator = kwargs.get('decorator', '')
        func_prefix = kwargs.get('function_prefix', '')
        body_prefix = kwargs.get('body_prefix', '')

        # Maybe we should write our own template files into the build dir
        # instead, but that seems like much more work, nice as it would be.
        fhead = ''
        if body_prefix != '':
            fhead += '%s\n' % body_prefix
        fhead += '#include "%s"\n' % hdr_filename
        for hdr in sources:
            fhead += '#include "{}"\n'.format(os.path.basename(str(hdr)))
        fhead += textwrap.dedent(
            '''
            #define C_ENUM(v) ((gint) v)
            #define C_FLAGS(v) ((guint) v)
            ''')
        c_file_kwargs['fhead'] = fhead

        c_file_kwargs['fprod'] = textwrap.dedent(
            '''
            /* enumerations from "@basename@" */
            ''')

        c_file_kwargs['vhead'] = textwrap.dedent(
            f'''
            GType
            {func_prefix}@enum_name@_get_type (void)
            {{
            static gsize gtype_id = 0;
            static const G@Type@Value values[] = {{''')

        c_file_kwargs['vprod'] = '    { C_@TYPE@(@VALUENAME@), "@VALUENAME@", "@valuenick@" },'

        c_file_kwargs['vtail'] = textwrap.dedent(
            '''    { 0, NULL, NULL }
            };
            if (g_once_init_enter (&gtype_id)) {
                GType new_type = g_@type@_register_static (g_intern_static_string ("@EnumName@"), values);
                g_once_init_leave (&gtype_id, new_type);
            }
            return (GType) gtype_id;
            }''')

        rv = self.mkenums(state, [body_filename], c_file_kwargs)
        c_file = rv.return_value

        # .h file generation
        h_file_kwargs = copy.deepcopy(mkenums_kwargs)

        h_file_kwargs['fhead'] = textwrap.dedent(
            f'''#pragma once

            #include <glib-object.h>
            {header_prefix}

            G_BEGIN_DECLS
            ''')

        h_file_kwargs['fprod'] = textwrap.dedent(
            '''
            /* enumerations from "@basename@" */
            ''')

        h_file_kwargs['vhead'] = textwrap.dedent(
            f'''
            {decl_decorator}
            GType {func_prefix}@enum_name@_get_type (void);
            #define @ENUMPREFIX@_TYPE_@ENUMSHORT@ ({func_prefix}@enum_name@_get_type())''')

        h_file_kwargs['ftail'] = textwrap.dedent(
            '''
            G_END_DECLS''')

        rv = self.mkenums(state, [hdr_filename], h_file_kwargs)
        h_file = rv.return_value

        return ModuleReturnValue([c_file, h_file], [c_file, h_file])

    @staticmethod
    def _make_mkenum_custom_target(
            state: 'ModuleState',
            sources: T.Sequence[T.Union[str, mesonlib.File, build.CustomTarget, build.CustomTargetIndex, build.GeneratedList]],
            output: str, cmd: T.List[str], kwargs: T.Dict[str, T.Any]) -> build.CustomTarget:
        custom_kwargs = {
            'input': sources,
            'output': [output],
            'capture': True,
            'command': cmd
        }
        custom_kwargs.update(kwargs)
        return build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs,
                                  # https://github.com/mesonbuild/meson/issues/973
                                  absolute_paths=True)

    @permittedKwargs({'sources', 'prefix', 'install_header', 'install_dir', 'stdinc',
                      'nostdinc', 'internal', 'skip_source', 'valist_marshallers',
                      'extra_args'})
    @typed_pos_args('gnome.genmarshal', str)
    def genmarshal(self, state: 'ModuleState', args: T.Tuple[str], kwargs) -> ModuleReturnValue:
        output = args[0]

        if 'sources' not in kwargs:
            raise MesonException('Missing keyword argument "sources".')
        sources = kwargs.pop('sources')
        if isinstance(sources, str):
            sources = [sources]
        elif not isinstance(sources, list):
            raise MesonException(
                'Sources keyword argument must be a string or array.')

        new_genmarshal = mesonlib.version_compare(self._get_native_glib_version(state), '>= 2.53.3')

        cmd = [state.find_program('glib-genmarshal')]
        known_kwargs = ['internal', 'nostdinc', 'skip_source', 'stdinc',
                        'valist_marshallers', 'extra_args']
        known_custom_target_kwargs = ['build_always', 'depends',
                                      'depend_files', 'install_dir',
                                      'install_header']
        for arg, value in kwargs.items():
            if arg == 'prefix':
                cmd += ['--prefix', value]
            elif arg == 'extra_args':
                if new_genmarshal:
                    cmd += mesonlib.stringlistify(value)
                else:
                    mlog.warning('The current version of GLib does not support extra arguments \n'
                                 'for glib-genmarshal. You need at least GLib 2.53.3. See ',
                                 mlog.bold('https://github.com/mesonbuild/meson/pull/2049'))
            elif arg in known_kwargs and value:
                cmd += ['--' + arg.replace('_', '-')]
            elif arg not in known_custom_target_kwargs:
                raise MesonException(f'Genmarshal does not take a {arg} keyword argument.')

        install_header = kwargs.pop('install_header', False)
        install_dir = kwargs.pop('install_dir', [])

        custom_kwargs = {
            'input': sources,
        }

        # https://github.com/GNOME/glib/commit/0fbc98097fac4d3e647684f344e508abae109fdf
        if mesonlib.version_compare(self._get_native_glib_version(state), '>= 2.51.0'):
            cmd += ['--output', '@OUTPUT@']
        else:
            custom_kwargs['capture'] = True

        for arg in known_custom_target_kwargs:
            if arg in kwargs:
                custom_kwargs[arg] = kwargs[arg]

        header_file = output + '.h'
        custom_kwargs['command'] = cmd + ['--body', '@INPUT@']
        if mesonlib.version_compare(self._get_native_glib_version(state), '>= 2.53.4'):
            # Silence any warnings about missing prototypes
            custom_kwargs['command'] += ['--include-header', header_file]
        custom_kwargs['output'] = output + '.c'
        body = build.CustomTarget(output + '_c', state.subdir, state.subproject, custom_kwargs)

        custom_kwargs['install'] = install_header
        custom_kwargs['install_dir'] = install_dir
        if new_genmarshal:
            cmd += ['--pragma-once']
        custom_kwargs['command'] = cmd + ['--header', '@INPUT@']
        custom_kwargs['output'] = header_file
        header = build.CustomTarget(output + '_h', state.subdir, state.subproject, custom_kwargs)

        rv = [body, header]
        return ModuleReturnValue(rv, rv)

    @staticmethod
    def _vapi_args_to_command(prefix: str, variable: str, kwargs: T.Dict[str, T.Any], accept_vapi: bool = False) -> T.List[str]:
        arg_list = mesonlib.extract_as_list(kwargs, variable)
        ret: T.List[str] = []
        for arg in arg_list:
            if not isinstance(arg, str):
                types = 'strings' + ' or InternalDependencys' if accept_vapi else ''
                raise MesonException(f'All {variable} must be {types}')
            ret.append(prefix + arg)
        return ret

    def _extract_vapi_packages(self, state: 'ModuleState', kwargs: T.Dict[str, T.Any]
                               ) -> T.Tuple[T.List[str], T.List[build.Target], T.List[str], T.List[str]]:
        '''
        Packages are special because we need to:
        - Get a list of packages for the .deps file
        - Get a list of depends for any VapiTargets
        - Get package name from VapiTargets
        - Add include dirs for any VapiTargets
        '''
        arg_list = kwargs.get('packages')
        if not arg_list:
            return [], [], [], []
        arg_list = mesonlib.listify(arg_list)
        vapi_depends: T.List[build.Target] = []
        vapi_packages: T.List[str] = []
        vapi_includes: T.List[str] = []
        ret: T.List[str] = []
        remaining_args = []
        for arg in arg_list:
            if isinstance(arg, InternalDependency):
                targets = [t for t in arg.sources if isinstance(t, VapiTarget)]
                for target in targets:
                    srcdir = os.path.join(state.environment.get_source_dir(),
                                          target.get_subdir())
                    outdir = os.path.join(state.environment.get_build_dir(),
                                          target.get_subdir())
                    outfile = target.get_outputs()[0][:-5] # Strip .vapi
                    ret.append('--vapidir=' + outdir)
                    ret.append('--girdir=' + outdir)
                    ret.append('--pkg=' + outfile)
                    vapi_depends.append(target)
                    vapi_packages.append(outfile)
                    vapi_includes.append(srcdir)
            else:
                assert isinstance(arg, str), 'for mypy'
                vapi_packages.append(arg)
                remaining_args.append(arg)

        kwargs['packages'] = remaining_args
        vapi_args = ret + self._vapi_args_to_command('--pkg=', 'packages', kwargs, accept_vapi=True)
        return vapi_args, vapi_depends, vapi_packages, vapi_includes

    def _generate_deps(self, state: 'ModuleState', library: str, packages: T.List[str], install_dir: str) -> build.Data:
        outdir = state.environment.scratch_dir
        fname = os.path.join(outdir, library + '.deps')
        with open(fname, 'w', encoding='utf-8') as ofile:
            for package in packages:
                ofile.write(package + '\n')
        return build.Data([mesonlib.File(True, outdir, fname)], install_dir, install_dir, mesonlib.FileMode(), state.subproject)

    def _get_vapi_link_with(self, target: build.CustomTarget) -> T.List[T.Union[build.BuildTarget, build.CustomTarget]]:
        link_with: T.List[T.Union[build.BuildTarget, build.CustomTarget]] = []
        for dep in target.get_target_dependencies():
            if isinstance(dep, build.SharedLibrary):
                link_with.append(dep)
            elif isinstance(dep, GirTarget):
                link_with += self._get_vapi_link_with(dep)
        return link_with

    @permittedKwargs({'sources', 'packages', 'metadata_dirs', 'gir_dirs',
                      'vapi_dirs', 'install', 'install_dir'})
    @typed_pos_args('gnome.generate_vapi', str)
    def generate_vapi(self, state: 'ModuleState', args: T.Tuple[str], kwargs) -> ModuleReturnValue:
        created_values = []
        library = args[0]
        build_dir = os.path.join(state.environment.get_build_dir(), state.subdir)
        source_dir = os.path.join(state.environment.get_source_dir(), state.subdir)
        pkg_cmd, vapi_depends, vapi_packages, vapi_includes = self._extract_vapi_packages(state, kwargs)
        cmd: T.List[T.Union[str, 'ExternalProgram']]
        cmd = [state.find_program('vapigen')]
        cmd += ['--quiet', '--library=' + library, '--directory=' + build_dir]
        cmd += self._vapi_args_to_command('--vapidir=', 'vapi_dirs', kwargs)
        cmd += self._vapi_args_to_command('--metadatadir=', 'metadata_dirs', kwargs)
        cmd += self._vapi_args_to_command('--girdir=', 'gir_dirs', kwargs)
        cmd += pkg_cmd
        cmd += ['--metadatadir=' + source_dir]

        if 'sources' not in kwargs:
            raise MesonException('sources are required to generate the vapi file')

        inputs = mesonlib.extract_as_list(kwargs, 'sources')

        link_with = []
        for i in inputs:
            if isinstance(i, str):
                cmd.append(os.path.join(source_dir, i))
            elif isinstance(i, GirTarget):
                link_with += self._get_vapi_link_with(i)
                subdir = os.path.join(state.environment.get_build_dir(),
                                      i.get_subdir())
                gir_file = os.path.join(subdir, i.get_outputs()[0])
                cmd.append(gir_file)
            else:
                raise MesonException('Input must be a str or GirTarget')

        vapi_output = library + '.vapi'
        custom_kwargs = {
            'command': cmd,
            'input': inputs,
            'output': vapi_output,
            'depends': vapi_depends,
        }
        install_dir = kwargs.get('install_dir',
                                 os.path.join(state.environment.coredata.get_option(mesonlib.OptionKey('datadir')),
                                              'vala', 'vapi'))
        if kwargs.get('install'):
            custom_kwargs['install'] = kwargs['install']
            custom_kwargs['install_dir'] = install_dir

            # We shouldn't need this locally but we install it
            deps_target = self._generate_deps(state, library, vapi_packages, install_dir)
            created_values.append(deps_target)
        vapi_target = VapiTarget(vapi_output, state.subdir, state.subproject, custom_kwargs)

        # So to try our best to get this to just work we need:
        # - link with with the correct library
        # - include the vapi and dependent vapi files in sources
        # - add relevant directories to include dirs
        incs = [build.IncludeDirs(state.subdir, ['.'] + vapi_includes, False)]
        sources = [vapi_target] + vapi_depends
        rv = InternalDependency(None, incs, [], [], link_with, [], sources, [], {})
        created_values.append(rv)
        return ModuleReturnValue(rv, created_values)

def initialize(interp: 'Interpreter') -> GnomeModule:
    mod = GnomeModule(interp)
    mod.interpreter.append_holder_map(GResourceTarget, interpreter.CustomTargetHolder)
    mod.interpreter.append_holder_map(GResourceHeaderTarget, interpreter.CustomTargetHolder)
    mod.interpreter.append_holder_map(GirTarget, interpreter.CustomTargetHolder)
    mod.interpreter.append_holder_map(TypelibTarget, interpreter.CustomTargetHolder)
    mod.interpreter.append_holder_map(VapiTarget, interpreter.CustomTargetHolder)
    return mod