Localisation

Localising your application with GNU gettext takes a little effort but is quite straightforward. We'll create a po subdirectory at your project root directory for all the localisation info.

Generating .pot and .po files

In your main meson.build file include the po subdirectory in the build proces.

subdir('po')

In this po subdirectory we need:

  • LINGUAS: Space separated list of languages
  • POTFILES: List of source files to scan for translatable strings.
  • meson.build: Localization specific meson file

LINGUAS

File with space separated list of languages. A sample LINGUAS might look like this.

aa ab ae af

POTFILES

File that lists all the source files that gettext should scan in order to find strings to translate. The syntax of the file is one line per source file and the line must contain the relative path from source root. A sample POTFILES might look like this.

src/file1.c
src/file2.c
src/subdir/file3.c
include/mything/somefile.h

meson.build

Localization specific meson file. It imports and uses the i18n module. If not defined before it needs to define the GETTEXT_PACKAGE global.

i18n = import('i18n')
# define GETTEXT_PACKAGE
add_project_arguments('-DGETTEXT_PACKAGE="intltest"', language:'c')
i18n.gettext(meson.project_name(),
    args: '--directory=' + meson.source_root()
)

The first command imports the i18n module that provides gettext features. The fourth line does the actual invocation. The first argument is the gettext package name. This causes two things to happen. The first is that Meson will generate binary mo files and put them to their proper locations when doing an install. The second is that it creates a build rule to regenerate the main pot file. If you are using the Ninja backend, this is how you would invoke the rebuild.

generate .pot file

Then we need to generate the main pot file. The potfile can have any name but is usually the name of the gettext package. Let's say the project is called intltest. In this case the corresponding pot file would be called intltest.pot.

Run the following command from your build folder to generate the pot file. It is recommended to inspect it manually afterwards and fill in e.g. proper copyright and contact information.

$ ninja intltest-pot

generate .po files

For each language listed in the array above we need a corresponding .po file. Those can be generated by running the following command from your build folder.

$ ninja intltest-update-po

The results of the search are