meson/mesonbuild/modules/gnome.py

# 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 and gresources.'''

from .. import build
import os
import subprocess
from ..mesonlib import MesonException
from .. import dependencies
from .. import mlog
from .. import mesonlib
from .. import interpreter

native_glib_version = None
girwarning_printed = False
gresource_warning_printed = False

class GnomeModule:

    def get_native_glib_version(self, state):
        global native_glib_version
        if native_glib_version is None:
            glib_dep = dependencies.PkgConfigDependency(
                'glib-2.0', state.environment, {'native': True})
            native_glib_version = glib_dep.get_modversion()
        return native_glib_version

    def __print_gresources_warning(self, state):
        global gresource_warning_printed
        if not gresource_warning_printed:
            if mesonlib.version_compare(self.get_native_glib_version(state), '< 2.50.0'):
                mlog.log('Warning, GLib compiled dependencies do not work fully '
                         'with versions of GLib older than 2.50.0.\n'
                         'See the following upstream issue:',
                         mlog.bold('https://bugzilla.gnome.org/show_bug.cgi?id=745754'))
            gresource_warning_printed = True
        return []

    def compile_resources(self, state, args, kwargs):
        self.__print_gresources_warning(state)

        cmd = ['glib-compile-resources', '@INPUT@']

        source_dirs = kwargs.pop('source_dir', [])
        if not isinstance(source_dirs, list):
            source_dirs = [source_dirs]

        # Always include current directory, but after paths set by user
        source_dirs.append(os.path.join(state.environment.get_source_dir(), state.subdir))

        if len(args) < 2:
            raise MesonException('Not enough arguments; The name of the resource and the path to the XML file are required')

        dependencies = kwargs.pop('dependencies', [])
        if not isinstance(dependencies, list):
            dependencies = [dependencies]

        if mesonlib.version_compare(self.get_native_glib_version(state),
                                    '< 2.48.2'):
            if len(dependencies) > 0:
                raise MesonException(
                  'The "dependencies" argument of gnome.compile_resources() '
                  'can only be used with glib-compile-resources version '
                  '2.48.2 or newer, due to '
                  '<https://bugzilla.gnome.org/show_bug.cgi?id=673101>')

        ifile = args[1]
        if isinstance(ifile, mesonlib.File):
            ifile = os.path.join(ifile.subdir, ifile.fname)
        elif isinstance(ifile, str):
            ifile = os.path.join(state.subdir, ifile)
        else:
            raise RuntimeError('Unreachable code.')

        kwargs['depend_files'] = self.get_gresource_dependencies(
            state, ifile, source_dirs, dependencies)

        for source_dir in source_dirs:
            sourcedir = os.path.join(state.build_to_src, state.subdir, source_dir)
            cmd += ['--sourcedir', sourcedir]

            if len(dependencies) > 0:
                # Add the build variant of each sourcedir if we have any
                # generated dependencies.
                sourcedir = os.path.join(state.subdir, source_dir)
                cmd += ['--sourcedir', sourcedir]

        if 'c_name' in kwargs:
            cmd += ['--c-name', kwargs.pop('c_name')]
        cmd += ['--generate', '--target', '@OUTPUT@']

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

        kwargs['command'] = cmd
        kwargs['input'] = args[1]
        kwargs['output'] = args[0] + '.c'
        target_c = build.CustomTarget(args[0] + '_c', state.subdir, kwargs)
        kwargs['output'] = args[0] + '.h'
        target_h = build.CustomTarget(args[0] + '_h', state.subdir, kwargs)
        return [target_c, target_h]

    def get_gresource_dependencies(self, state, input_file, source_dirs, dependencies):
        self.__print_gresources_warning(state)

        for dep in dependencies:
            if not isinstance(dep, interpreter.CustomTargetHolder) and not \
                    isinstance(dep, mesonlib.File):
                raise MesonException(
                    'Unexpected dependency type for gnome.compile_resources() '
                    '"dependencies" argument. Please pass the output of '
                    'custom_target() or configure_file().')

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

        for source_dir in source_dirs:
            cmd += ['--sourcedir', os.path.join(state.subdir, source_dir)]

        pc = subprocess.Popen(cmd, stdout=subprocess.PIPE, universal_newlines=True,
                              cwd=state.environment.get_source_dir())
        (stdout, _) = pc.communicate()
        if pc.returncode != 0:
            mlog.log(mlog.bold('Warning:'), 'glib-compile-resources has failed to get the dependencies for {}'.format(cmd[1]))
            raise subprocess.CalledProcessError(pc.returncode, cmd)

        dep_files = stdout.split('\n')[:-1]

        # 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.

        def exists_in_srcdir(f):
            return os.path.exists(os.path.join(state.environment.get_source_dir(), f))
        missing_dep_files = [f for f in dep_files if not exists_in_srcdir(f)]

        for missing in missing_dep_files:
            found = False
            missing_basename = os.path.basename(missing)

            for dep in dependencies:
                if isinstance(dep, mesonlib.File):
                    if dep.fname == missing_basename:
                        found = True
                        dep_files.remove(missing)
                        dep_files.append(dep)
                        break
                elif isinstance(dep, interpreter.CustomTargetHolder):
                    if dep.held_object.get_basename() == missing_basename:
                        found = True
                        dep_files.remove(missing)
                        dep_files.append(
                            mesonlib.File(
                                is_built=True,
                                subdir=dep.held_object.get_subdir(),
                                fname=dep.held_object.get_basename()))
                        break

            if not found:
                raise MesonException(
                    'Resource "%s" listed in "%s" was not found. If this is a '
                    'generated file, pass the target that generates it to '
                    'gnome.compile_resources() using the "dependencies" '
                    'keyword argument.' % (missing, input_file))

        return dep_files

    def get_link_args(self, state, lib, depends=None):
        link_command = ['-l%s' % lib.name]
        if isinstance(lib, build.SharedLibrary):
            link_command += ['-L%s' %
                    os.path.join(state.environment.get_build_dir(),
                        lib.subdir)]
            if depends:
                depends.append(lib)
        return link_command

    def get_include_args(self, state, include_dirs, prefix='-I'):
        if not include_dirs:
            return []

        dirs_str = []
        for incdirs in include_dirs:
            if hasattr(incdirs, "held_object"):
                dirs = incdirs.held_object
            else:
                dirs = incdirs

            if isinstance(dirs, str):
                dirs_str += ['%s%s' % (prefix, dirs)]
                continue

            # Should be build.IncludeDirs object.
            basedir = dirs.get_curdir()
            for d in dirs.get_incdirs():
                expdir =  os.path.join(basedir, d)
                srctreedir = os.path.join(state.environment.get_source_dir(), expdir)
                buildtreedir = os.path.join(state.environment.get_build_dir(), expdir)
                dirs_str += ['%s%s' % (prefix, buildtreedir),
                             '%s%s' % (prefix, srctreedir)]
            for d in dirs.get_extra_build_dirs():
                dirs_str += ['%s%s' % (prefix, d)]

        return dirs_str

    def get_dependencies_flags(self, deps, state, depends=None):
        cflags = set()
        ldflags = set()
        gi_includes = set()
        if not isinstance(deps, list):
            deps = [deps]

        for dep in deps:
            if hasattr(dep, 'held_object'):
                dep = dep.held_object
            if isinstance(dep, dependencies.InternalDependency):
                cflags.update(self.get_include_args( state, dep.include_directories))
                for lib in dep.libraries:
                    ldflags.update(self.get_link_args(state, lib.held_object, depends))
                    libdepflags = self.get_dependencies_flags(lib.held_object.get_external_deps(), state, depends)
                    cflags.update(libdepflags[0])
                    ldflags.update(libdepflags[1])
                    gi_includes.update(libdepflags[2])
                extdepflags = self.get_dependencies_flags(dep.ext_deps, state, depends)
                cflags.update(extdepflags[0])
                ldflags.update(extdepflags[1])
                gi_includes.update(extdepflags[2])
                for source in dep.sources:
                    if hasattr(source, 'held_object') and isinstance(source.held_object, GirTarget):
                        gi_includes.update([os.path.join(state.environment.get_build_dir(),
                                        source.held_object.get_subdir())])
            # This should be any dependency other than an internal one.
            elif isinstance(dep, dependencies.Dependency):
                cflags.update(dep.get_compile_args())
                for lib in dep.get_link_args():
                    if (os.path.isabs(lib) and
                            # For PkgConfigDependency only:
                            getattr(dep, 'is_libtool', False)):
                        ldflags.update(["-L%s" % os.path.dirname(lib)])
                        libname = os.path.basename(lib)
                        if libname.startswith("lib"):
                            libname = libname[3:]
                        libname = libname.split(".so")[0]
                        lib = "-l%s" % libname
                    # Hack to avoid passing some compiler options in
                    if lib.startswith("-W"):
                        continue
                    ldflags.update([lib])

                if isinstance(dep, dependencies.PkgConfigDependency):
                    girdir = dep.get_variable("girdir")
                    if girdir:
                        gi_includes.update([girdir])
            elif isinstance(dep, (build.StaticLibrary, build.SharedLibrary)):
                for incd in dep.get_include_dirs():
                    cflags.update(incd.get_incdirs())
            else:
                mlog.log('dependency %s not handled to build gir files' % dep)
                continue

        return cflags, ldflags, gi_includes

    def generate_gir(self, state, args, kwargs):
        if len(args) != 1:
            raise MesonException('Gir takes one argument')
        if kwargs.get('install_dir'):
            raise MesonException('install_dir is not supported with generate_gir(), see "install_dir_gir" and "install_dir_typelib"')
        girtarget = args[0]
        while hasattr(girtarget, 'held_object'):
            girtarget = girtarget.held_object
        if not isinstance(girtarget, (build.Executable, build.SharedLibrary)):
            raise MesonException('Gir target must be an executable or shared library')
        try:
            pkgstr = subprocess.check_output(['pkg-config', '--cflags', 'gobject-introspection-1.0'])
        except Exception:
            global girwarning_printed
            if not girwarning_printed:
                mlog.log(mlog.bold('Warning:'), 'gobject-introspection dependency was not found, disabling gir generation.')
                girwarning_printed = True
            return []
        pkgargs = pkgstr.decode().strip().split()
        ns = kwargs.pop('namespace')
        nsversion = kwargs.pop('nsversion')
        libsources = kwargs.pop('sources')
        girfile = '%s-%s.gir' % (ns, nsversion)
        depends = [girtarget]
        gir_inc_dirs = []

        scan_command = ['g-ir-scanner', '@INPUT@']
        scan_command += pkgargs
        scan_command += ['--no-libtool', '--namespace='+ns, '--nsversion=' + nsversion, '--warn-all',
                         '--output', '@OUTPUT@']

        extra_args = mesonlib.stringlistify(kwargs.pop('extra_args', []))
        scan_command += extra_args
        scan_command += ['-I' + os.path.join(state.environment.get_source_dir(), state.subdir),
                         '-I' + os.path.join(state.environment.get_build_dir(), state.subdir)]
        scan_command += self.get_include_args(state, girtarget.get_include_dirs())

        if 'link_with' in kwargs:
            link_with = kwargs.pop('link_with')
            if not isinstance(link_with, list):
                link_with = [link_with]
            for link in link_with:
                scan_command += self.get_link_args(state, link.held_object, depends)

        if 'includes' in kwargs:
            includes = kwargs.pop('includes')
            if not isinstance(includes, list):
                includes = [includes]
            for inc in includes:
                if hasattr(inc, 'held_object'):
                    inc = inc.held_object
                if isinstance(inc, str):
                    scan_command += ['--include=%s' % (inc, )]
                elif isinstance(inc, GirTarget):
                    gir_inc_dirs += [
                        os.path.join(state.environment.get_build_dir(),
                                     inc.get_subdir()),
                    ]
                    scan_command += [
                        "--include=%s" % (inc.get_basename()[:-4], ),
                    ]
                    depends += [inc]
                else:
                    raise MesonException(
                        'Gir includes must be str, GirTarget, or list of them')
        if state.global_args.get('c'):
            scan_command += ['--cflags-begin']
            scan_command += state.global_args['c']
            scan_command += ['--cflags-end']
        if kwargs.get('symbol_prefix'):
            sym_prefix = kwargs.pop('symbol_prefix')
            if not isinstance(sym_prefix, str):
                raise MesonException('Gir symbol prefix must be str')
            scan_command += ['--symbol-prefix=%s' % sym_prefix]
        if kwargs.get('identifier_prefix'):
            identifier_prefix = kwargs.pop('identifier_prefix')
            if not isinstance(identifier_prefix, str):
                raise MesonException('Gir identifier prefix must be str')
            scan_command += ['--identifier-prefix=%s' % identifier_prefix]
        if kwargs.get('export_packages'):
            pkgs = kwargs.pop('export_packages')
            if isinstance(pkgs, str):
                scan_command += ['--pkg-export=%s' % pkgs]
            elif isinstance(pkgs, list):
                scan_command += ['--pkg-export=%s' % pkg for pkg in pkgs]
            else:
                raise MesonException('Gir export packages must be str or list')

        deps = kwargs.pop('dependencies', [])
        if not isinstance(deps, list):
            deps = [deps]
        deps = (girtarget.get_all_link_deps() + girtarget.get_external_deps() +
                deps)
        cflags, ldflags, gi_includes = self.get_dependencies_flags(deps, state, depends)
        scan_command += list(cflags) + list(ldflags)
        for i in gi_includes:
            scan_command += ['--add-include-path=%s' % i]

        inc_dirs = kwargs.pop('include_directories', [])
        if not isinstance(inc_dirs, list):
            inc_dirs = [inc_dirs]
        for incd in inc_dirs:
            if not isinstance(incd.held_object, (str, build.IncludeDirs)):
                raise MesonException(
                    'Gir include dirs should be include_directories().')
        scan_command += self.get_include_args(state, inc_dirs)
        scan_command += self.get_include_args(state, gir_inc_dirs + inc_dirs,
                                              prefix='--add-include-path=')

        if isinstance(girtarget, build.Executable):
            scan_command += ['--program', girtarget]
        elif isinstance(girtarget, build.SharedLibrary):
            scan_command += ["-L@PRIVATE_OUTDIR_ABS_%s@" % girtarget.get_id()]
            libname = girtarget.get_basename()
            scan_command += ['--library', libname]
        scankwargs = {'output' : girfile,
                      'input' : libsources,
                      'command' : scan_command,
                      'depends' : depends,
                     }
        if kwargs.get('install'):
            scankwargs['install'] = kwargs['install']
            scankwargs['install_dir'] = kwargs.get('install_dir_gir',
                os.path.join(state.environment.get_datadir(), 'gir-1.0'))
        scan_target = GirTarget(girfile, state.subdir, scankwargs)

        typelib_output = '%s-%s.typelib' % (ns, nsversion)
        typelib_cmd = ['g-ir-compiler', scan_target, '--output', '@OUTPUT@']
        typelib_cmd += self.get_include_args(state, gir_inc_dirs,
                                             prefix='--includedir=')
        for dep in deps:
            if hasattr(dep, 'held_object'):
                dep = dep.held_object
            if isinstance(dep, dependencies.InternalDependency):
                for source in dep.sources:
                    if isinstance(source.held_object, GirTarget):
                        typelib_cmd += [
                            "--includedir=%s" % (
                                os.path.join(state.environment.get_build_dir(),
                                             source.held_object.get_subdir()),
                            )
                        ]
            elif isinstance(dep, dependencies.PkgConfigDependency):
                girdir = dep.get_variable("girdir")
                if girdir:
                    typelib_cmd += ["--includedir=%s" % (girdir, )]

        typelib_kwargs = {
            'output': typelib_output,
            'command': typelib_cmd,
        }
        if kwargs.get('install'):
            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_target = TypelibTarget(typelib_output, state.subdir, typelib_kwargs)
        return [scan_target, typelib_target]

    def compile_schemas(self, state, args, kwargs):
        if len(args) != 0:
            raise MesonException('Compile_schemas does not take positional arguments.')
        srcdir = os.path.join(state.build_to_src, state.subdir)
        outdir = state.subdir
        cmd = ['glib-compile-schemas', '--targetdir', outdir, srcdir]
        kwargs['command'] = cmd
        kwargs['input'] = []
        kwargs['output'] = 'gschemas.compiled'
        if state.subdir == '':
            targetname = 'gsettings-compile'
        else:
            targetname = 'gsettings-compile-' + state.subdir
        target_g = build.CustomTarget(targetname, state.subdir, kwargs)
        return target_g

    def gtkdoc(self, state, args, kwargs):
        if len(args) != 1:
            raise MesonException('Gtkdoc must have one positional argument.')
        modulename = args[0]
        if not isinstance(modulename, str):
            raise MesonException('Gtkdoc arg must be string.')
        if not 'src_dir' 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.')
        if main_xml != '':
            if main_file != '':
                raise MesonException('You can only specify main_xml or main_sgml, not both.')
            main_file = main_xml
        src_dir = kwargs['src_dir']
        targetname = modulename + '-doc'
        command = [state.environment.get_build_command(), '--internal', 'gtkdoc']
        if hasattr(src_dir, 'held_object'):
            src_dir= src_dir.held_object
            if not isinstance(src_dir, build.IncludeDirs):
                raise MesonException('Invalid keyword argument for src_dir.')
            incdirs = src_dir.get_incdirs()
            if len(incdirs) != 1:
                raise MesonException('Argument src_dir has more than one directory specified.')
            header_dir = os.path.join(state.environment.get_source_dir(), src_dir.get_curdir(), incdirs[0])
        else:
            header_dir = os.path.normpath(os.path.join(state.subdir, src_dir))
        args = ['--sourcedir=' + state.environment.get_source_dir(),
                '--builddir=' + state.environment.get_build_dir(),
                '--subdir=' + state.subdir,
                '--headerdir=' + header_dir,
                '--mainfile=' + main_file,
                '--modulename=' + modulename]
        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('--html-assets=', 'html_assets', kwargs, state)
        args += self.unpack_args('--content-files=', 'content_files', kwargs, state)
        args += self.unpack_args('--installdir=', 'install_dir', kwargs, state)
        args += self.get_build_args(kwargs, state)
        res = [build.RunTarget(targetname, command[0], command[1:] + args, [], state.subdir)]
        if kwargs.get('install', True):
            res.append(build.InstallScript(command + args))
        return res

    def get_build_args(self, kwargs, state):
        args = []
        cflags, ldflags, gi_includes = self.get_dependencies_flags(kwargs.get('dependencies', []), state)
        inc_dirs = kwargs.get('include_directories', [])
        if not isinstance(inc_dirs, list):
            inc_dirs = [inc_dirs]
        for incd in inc_dirs:
            if not isinstance(incd.held_object, (str, build.IncludeDirs)):
                raise MesonException(
                    'Gir include dirs should be include_directories().')
        cflags.update(self.get_include_args(state, inc_dirs))
        if cflags:
            args += ['--cflags=%s' % ' '.join(cflags)]
        if ldflags:
            args += ['--ldflags=%s' % ' '.join(ldflags)]
        compiler = state.environment.coredata.compilers.get('c')
        if compiler:
            args += ['--cc=%s' % ' '.join(compiler.get_exelist())]
            args += ['--ld=%s' % ' '.join(compiler.get_linker_exelist())]

        return args

    def gtkdoc_html_dir(self, state, args, kwarga):
        if len(args) != 1:
            raise MesonException('Must have exactly one argument.')
        modulename = args[0]
        if not isinstance(modulename, str):
            raise MesonException('Argument must be a string')
        return os.path.join('share/gtkdoc/html', modulename)


    def unpack_args(self, arg, kwarg_name, kwargs, expend_file_state=None):
        if kwarg_name not in kwargs:
            return []

        new_args = kwargs[kwarg_name]
        if not isinstance(new_args, list):
            new_args = [new_args]
        args = []
        for i in new_args:
            if expend_file_state and isinstance(i, mesonlib.File):
                i = os.path.join(expend_file_state.environment.get_build_dir(), i.subdir, i.fname)
            elif not isinstance(i, str):
                raise MesonException(kwarg_name + ' values must be strings.')
            args.append(i)

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

        return []

    def gdbus_codegen(self, state, args, kwargs):
        if len(args) != 2:
            raise MesonException('Gdbus_codegen takes two arguments, name and xml file.')
        namebase = args[0]
        xml_file = args[1]
        cmd = ['gdbus-codegen']
        if 'interface_prefix' in kwargs:
            cmd += ['--interface-prefix', kwargs.pop('interface_prefix')]
        if 'namespace' in kwargs:
            cmd += ['--c-namespace', kwargs.pop('namespace')]
        cmd += ['--generate-c-code', '@OUTDIR@/' + namebase, '@INPUT@']
        outputs = [namebase + '.c', namebase + '.h']
        custom_kwargs = {'input' : xml_file,
                         'output' : outputs,
                         'command' : cmd
                         }
        return build.CustomTarget(namebase + '-gdbus', state.subdir, custom_kwargs)

    def mkenums(self, state, args, kwargs):
        if len(args) != 1:
            raise MesonException('Mkenums requires one positional argument.')
        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', 'install_dir', 'build_always',
                                      'depends', 'depend_files']
        c_template = h_template = None
        install_header = False
        for arg, value in kwargs.items():
            if arg == 'sources':
                sources = [value] + sources
            elif arg == 'c_template':
                c_template = value
            elif arg == 'h_template':
                h_template = value
            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(
                    'Mkenums does not take a %s keyword argument.' % (arg, ))
        cmd = ['glib-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.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
            custom_kwargs['install'] = install_header
            if 'install_dir' not in custom_kwargs:
                custom_kwargs['install_dir'] = \
                    state.environment.coredata.get_builtin_option('includedir')
            h_target = self.make_mkenum_custom_target(state, h_sources,
                                                      h_output, h_cmd,
                                                      custom_kwargs)
            targets.append(h_target)

        if c_template is not None:
            c_output = 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
            # Never install the C file. Complain on bug tracker if you need it.
            custom_kwargs['install'] = False
            if h_template is not None:
                if 'depends' in custom_kwargs:
                    custom_kwargs['depends'] += [h_target]
                else:
                    custom_kwargs['depends'] = h_target
            c_target = self.make_mkenum_custom_target(state, c_sources,
                                                      c_output, c_cmd,
                                                      custom_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_builtin_option('includedir')
            target = self.make_mkenum_custom_target(state, sources, basename,
                                                    generic_cmd, custom_kwargs)
            return target
        elif len(targets) == 1:
            return targets[0]
        else:
            return targets

    def make_mkenum_custom_target(self, state, sources, output, cmd, kwargs):
        custom_kwargs = {
            'input': sources,
            'output': output,
            'capture': True,
            'command': cmd
        }
        custom_kwargs.update(kwargs)
        return build.CustomTarget(output, state.subdir, custom_kwargs)

    def genmarshal(self, state, args, kwargs):
        if len(args) != 1:
            raise MesonException(
                'Genmarshal requires one positional argument.')
        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.')

        cmd = ['glib-genmarshal']
        known_kwargs = ['internal', 'nostdinc', 'skip_source', 'stdinc',
                        'valist_marshallers']
        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 in known_kwargs and value:
                cmd += ['--' + arg.replace('_', '-')]
            elif arg not in known_custom_target_kwargs:
                raise MesonException(
                    'Genmarshal does not take a %s keyword argument.' % (
                        arg, ))

        install_header = kwargs.pop('install_header', False)
        install_dir = kwargs.pop('install_dir', None)

        custom_kwargs = {
            'input': sources,
            'capture': True,
        }
        for arg in known_custom_target_kwargs:
            if arg in kwargs:
                custom_kwargs[arg] = kwargs[arg]

        custom_kwargs['command'] = cmd + ['--header', '--body', '@INPUT@']
        custom_kwargs['output'] = output + '.c'
        body = build.CustomTarget(output + '_c', state.subdir, custom_kwargs)

        custom_kwargs['install'] = install_header
        if install_dir is not None:
            custom_kwargs['install_dir'] = install_dir
        custom_kwargs['command'] = cmd + ['--header', '@INPUT@']
        custom_kwargs['output'] = output + '.h'
        header = build.CustomTarget(output + '_h', state.subdir, custom_kwargs)

        return [body, header]


def initialize():
    return GnomeModule()

class GirTarget(build.CustomTarget):
    def __init__(self, name, subdir, kwargs):
        super().__init__(name, subdir, kwargs)

class TypelibTarget(build.CustomTarget):
    def __init__(self, name, subdir, kwargs):
        super().__init__(name, subdir, kwargs)