meson/docs/markdown/Gnome-module.md

GNOME module

This module provides helper tools for build operations needed when building Gnome/GLib programs.

Note: the compilation commands here might not work properly when you change the source files. This is a bug in the respective compilers which do not expose the required dependency information. This has been reported upstream in this bug. Until this is fixed you need to be careful when changing your source files.

Usage

To use this module, just do: gnome = import('gnome'). The following functions will then be available as methods on the object with the name gnome. You can, of course, replace the name gnome with anything else.

gnome.compile_resources()

    gnome.compile_resources(id: string, input_file: string | File,
                            build_by_default: bool = false,
                            c_name: string | None = None,
                            dependencies: [](File, CustomTarget, CustomTargetIndex) = [],
                            export: bool = false,
                            extra_args: []string = [],
                            gresource_bundle: bool = false,
                            install_dir: string | None = None,
                            source_dir: [string] = [],
                            ): (CustomTarget, CustomTarget) | CustomTarget

This function compiles resources specified in an XML file into code that can be embedded inside the main binary. Similar a build target it takes two positional arguments. The first one is the name of the resource and the second is the XML file containing the resource definitions. If the name is foobar, Meson will generate a header file called foobar.h, which you can then include in your sources.

• c_name: passed to the resource compiler as an argument after --c-name
• dependencies: extra targets to depend upon for building
• export: (Added 0.37.0) if true, export the symbols of the generated sources
• extra_args: extra command line arguments to pass to the resource
• gresource_bundle: (Added 0.37.0) if true, output a .gresource file instead of source
• install: (Added 0.37.0) if true, install the gresource file
• install_dir: (Added 0.37.0) location to install the header or bundle depending on previous options
• install_header: (Added 0.37.0) if true, install the header file
• source_dir: a list of directories where the resource compiler should look up the files

Returns an array containing: [c_source, header_file] or [gresource_bundle]

Example:

gnome = import('gnome')

asresources = gnome.compile_resources(
    'as-resources', 'data/asresources.gresource.xml',
    source_dir: 'data',
    c_name: 'as'
)

executable(
    meson.project_name(),
    asresources,
    dependencies: my_deps,
    install: true
)

gnome.generate_gir()

Generates GObject introspection data.

Takes one or more positional arguments:

Either one or more library objects you want to build gir data for, or a single executable object.

There are several keyword arguments. Many of these map directly to the g-ir-scanner tool so see its documentation for more information.

• dependencies: deps to use during introspection scanning
• extra_args: command line arguments to pass to gir compiler
• export_packages: extra packages the gir file exports
• sources: the list of sources to be scanned for gir data
• nsversion: namespace version
• namespace: the namespace for this gir object which determines output files
• identifier_prefix: the identifier prefix for the gir object, e.g. Gtk
• includes: list of gir names to be included, can also be a GirTarget
• header: (Added 0.43.0) name of main c header to include for the library, e.g. glib.h
• include_directories: extra include paths to look for gir files
• install: if true, install the generated files
• install_dir_gir: (Added 0.35.0) which directory to install the gir file into
• install_dir_typelib: (Added 0.35.0) which directory to install the typelib file into
• link_with: list of libraries to link with
• symbol_prefix: the symbol prefix for the gir object, e.g. gtk, (Since 0.43.0) an ordered list of multiple prefixes is allowed
• fatal_warnings: Since 0.55.0 turn scanner warnings into fatal errors.

Returns an array of two elements which are: [gir_target, typelib_target]

gnome.genmarshal()

Generates a marshal file using the glib-genmarshal tool. The first argument is the basename of the output files.

• extra_args: (Added 0.42.0) additional command line arguments to pass
• install_header: if true, install the generated header
• install_dir: directory to install header to
• nostdinc: if true, don't include the standard marshallers from glib
• internal: if true, mark generated sources as internal to glib-genmarshal (Requires GLib 2.54)
• prefix: the prefix to use for symbols
• skip_source: if true, skip source location comments
• stdinc: if true, include the standard marshallers from glib
• sources: the list of sources to use as inputs
• valist_marshallers: if true, generate va_list marshallers

Added 0.35.0

Returns an array of two elements which are: [c_source, header_file]

gnome.mkenums()

Generates enum files for GObject using the glib-mkenums tool. The first argument is the base name of the output files, unless c_template and h_template are specified. In this case, the output files will be the base name of the values passed as templates.

This method is essentially a wrapper around the glib-mkenums tool's command line API. It is the most featureful method for enum creation.

Typically you either provide template files or you specify the various template sections manually as strings.

Most libraries and applications will be using the same standard template with only minor tweaks, in which case the gnome.mkenums_simple() convenience method can be used instead.

Note that if you #include the generated header in any of the sources for a build target, you must add the generated header to the build target's list of sources to codify the dependency. This is true for all generated sources, not just mkenums.

• c_template: template to use for generating the source
• comments: comment passed to the command
• h_template: template to use for generating the header
• identifier_prefix: prefix to use for the identifiers
• install_header: if true, install the generated header
• install_dir: directory to install the header
• sources: the list of sources to make enums with
• symbol_prefix: prefix to use for the symbols
• eprod: enum text
• fhead: file header
• fprod: file text
• ftail: file tail
• vhead: value text
• vtail: value tail

Added 0.35.0

Returns an array of two elements which are: [c_source, header_file]

gnome.mkenums_simple()

Generates enum .c and .h files for GObject using the glib-mkenums tool with the standard template used by most GObject-based C libraries. The first argument is the base name of the output files.

Note that if you #include the generated header in any of the sources for a build target, you must add the generated header to the build target's list of sources to codify the dependency. This is true for all generated sources, not just mkenums_simple.

• body_prefix: additional prefix at the top of the body file, e.g. for extra includes
• decorator: optional decorator for the function declarations, e.g. GTK_AVAILABLE or GST_EXPORT
• function_prefix: additional prefix for function names, e.g. in case you want to add a leading underscore to functions used only internally
• header_prefix: additional prefix at the top of the header file, e.g. for extra includes (which may be needed if you specify a decorator for the function declarations)
• install_header: if true, install the generated header
• install_dir: directory to install the header
• identifier_prefix: prefix to use for the identifiers
• sources: the list of sources to make enums with
• symbol_prefix: prefix to use for the symbols

Example:

gnome = import('gnome')

my_headers = ['myheader1.h', 'myheader2.h']
my_sources = ['mysource1.c', 'mysource2.c']

# will generate myenums.c and myenums.h based on enums in myheader1.h and myheader2.h
enums = gnome.mkenums_simple('myenums', sources : my_headers)

mylib = library('my', my_sources, enums,
                include_directories: my_incs,
                dependencies: my_deps,
                c_args: my_cargs,
                install: true)

Added 0.42.0

Returns an array of two elements which are: [c_source, header_file]

gnome.compile_schemas()

When called, this method will compile the gschemas in the current directory. Note that this is not for installing schemas and is only useful when running the application locally for example during tests.

• build_by_default: causes, when set to true, to have this target be built by default, that is, when invoking plain meson compile, the default value is true for all built target types
• depend_files: files (@str, files, or configure_file) of schema source XML files that should trigger a re-compile if changed.

gnome.gdbus_codegen()

Compiles the given XML schema into gdbus source code. Takes two positional arguments, the first one specifies the base name to use while creating the output source and header and the second specifies one XML file.

• sources: list of XML files
• interface_prefix: prefix for the interface
• namespace: namespace of the interface
• extra_args: (Added 0.47.0) additional command line arguments to pass
• autocleanup: (Added 0.47.0) if set generates autocleanup code. Can be one of none, objects or all
• object_manager: (Added 0.40.0) if true generates object manager code
• annotations: (Added 0.43.0) list of lists of 3 strings for the annotation for 'ELEMENT', 'KEY', 'VALUE'
• docbook: (Added 0.43.0) prefix to generate 'PREFIX'-NAME.xml docbooks
• build_by_default: causes, when set to true, to have this target be built by default, that is, when invoking plain meson compile, the default value is true for all built target types
• install_dir: (Added 0.46.0) location to install the header or bundle depending on previous options
• install_header: (Added 0.46.0) if true, install the header file

Starting 0.46.0, this function returns a list of at least two custom targets (in order): one for the source code and one for the header. The list will contain a third custom target for the generated docbook files if that keyword argument is passed.

Earlier versions return a single custom target representing all the outputs. Generally, you should just add this list of targets to a top level target's source list.

Example:

gnome = import('gnome')

# The returned source would be passed to another target
gdbus_src = gnome.gdbus_codegen('example-interface',
  sources: 'com.example.Sample.xml',
  interface_prefix : 'com.example.',
  namespace : 'Sample',
  annotations : [
    ['com.example.Hello()', 'org.freedesktop.DBus.Deprecated', 'true']
  ],
  docbook : 'example-interface-doc'
)

gnome.generate_vapi()

Creates a VAPI file from gir. The first argument is the name of the library.

• gir_dirs: extra directories to include for gir files
• install: if true, install the VAPI file
• install_dir: location to install the VAPI file (defaults to datadir/vala/vapi)
• metadata_dirs: extra directories to include for metadata files
• packages: VAPI packages that are depended upon
• sources: the gir source to generate the VAPI from
• vapi_dirs: extra directories to include for VAPI files

Returns a custom dependency that can be included when building other VAPI or Vala binaries.

Added 0.36.0

gnome.yelp()

  gnome.yelp(id: string, sources: ...string, sources: []string, media: []string,
             languages: []string, symlink_media: bool = true): void

Installs help documentation using Yelp. The first argument is the project id.

Additionally, sources can be passed as additional positional arguments. This was, however, undocumented and never officially supported. Due to a longstanding bug, passing sources as a keyword argument will result in the positional argument sources to be ignored. since 0.60.0 A warning is raised in this case.

Since 0.43.0 if "languages" is not specified, a LINGUAS file will be read instead.

Since 0.60.0 the use of the positional argument sources has been deprecated, and the "sources" keyword argument should be used instead. The passing of sources as positional arguments will be removed in the future.

This also creates two targets for translations help-$project-update-po and help-$project-pot.

• languages: (deprecated since 0.43.0) list of languages for translation, overrides the LINGUAS file
• media: list of media such as images
• sources: list of pages
• symlink_media: if media should be symlinked not copied (defaults to true since 0.42.0)

Note that very old versions of yelp may not support symlinked media; At least 3.10 should work.

Added 0.36.0

gnome.gtkdoc()

Compiles and installs gtkdoc documentation into prefix/share/gtk-doc/html. Takes one positional argument: The name of the module.

• content_files: a list of content files
• dependencies: a list of dependencies
• fixxref_args: a list of arguments to pass to gtkdoc-fixxref
• gobject_typesfile: a list of type files
• include_directories: extra include paths to pass to gtkdoc-scangobj
• ignore_headers: a list of header files to ignore
• html_assets: a list of assets for the HTML pages
• html_args a list of arguments to pass to gtkdoc-mkhtml
• install: if true, installs the generated docs
• install_dir: the directory to install the generated docs relative to the gtk-doc html dir or an absolute path (default: module name)
• main_xml: specifies the main XML file
• main_sgml: equal to main_xml
• mkdb_args: a list of arguments to pass to gtkdoc-mkdb
• namespace: specifies the name space to pass to gtkdoc-mkdb
• module_version: the version of the module, affects the installed location and the devhelp2 file location
• scan_args: a list of arguments to pass to gtkdoc-scan
• scanobjs_args: a list of arguments to pass to gtkdoc-scangobj
• c_args: (Added 0.48.0) additional compile arguments to pass
• src_dir: include_directories to include
• check: (Since 0.52.0) if true runs gtkdoc-check when running unit tests. Note that this has the downside of rebuilding the doc for each build, which is often very slow. It usually should be enabled only in CI.

This also creates a $module-doc target that can be run to build documentation. Normally the documentation is only built on install.

Since 0.52.0 Returns a target object that can be passed as dependency to other targets using generated doc files (e.g. in content_files of another doc).

gnome.gtkdoc_html_dir()

Takes as argument a module name and returns the path where that module's HTML files will be installed. Usually used with install_data to install extra files, such as images, to the output directory.

gnome.post_install()

Since 0.57.0

Post-install update of various system wide caches. Each script will be executed only once even if gnome.post_install() is called multiple times from multiple subprojects. If DESTDIR is specified during installation all scripts will be skipped.

It takes the following keyword arguments:

• glib_compile_schemas: If set to true, update gschemas.compiled file in <prefix>/<datadir>/glib-2.0/schemas.
• gio_querymodules: List of directories relative to prefix where giomodule.cache file will be updated.
• gtk_update_icon_cache: If set to true, update icon-theme.cache file in <prefix>/<datadir>/icons/hicolor.
• update_desktop_database: Since 0.59.0 If set to true, update cache of MIME types handled by desktop files in <prefix>/<datadir>/applications.