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# I18n module
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This module provides internationalisation and localisation functionality.
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## Usage
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To use this module, just do: **`i18n = import('i18n')`**. The
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following functions will then be available as methods on the object
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with the name `i18n`. You can, of course, replace the name `i18n` with
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anything else.
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### i18n.gettext()
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Sets up gettext localisation so that translations are built and placed
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into their proper locations during install. Takes one positional
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argument which is the name of the gettext module.
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* `args`: list of extra arguments to pass to `xgettext` when
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generating the pot file
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* `data_dirs`: (*Added 0.36.0*) list of directories to be set for
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`GETTEXTDATADIRS` env var (Requires gettext 0.19.8+), used for local
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its files
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* `languages`: list of languages that are to be generated. As of
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0.37.0 this is optional and the
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[LINGUAS](https://www.gnu.org/software/gettext/manual/html_node/po_002fLINGUAS.html)
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file is read.
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* `preset`: (*Added 0.37.0*) name of a preset list of arguments,
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current option is `'glib'`, see
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[source](https://github.com/mesonbuild/meson/blob/master/mesonbuild/modules/i18n.py)
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for for their value
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* `install`: (*Added 0.43.0*) if false, do not install the built translations.
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* `install_dir`: (*Added 0.50.0*) override default install location, default is `localedir`
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This function also defines targets for maintainers to use:
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**Note**: These output to the source directory
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* `<project_id>-pot`: runs `xgettext` to regenerate the pot file
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* `<project_id>-update-po`: regenerates the `.po` files from current `.pot` file
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* `<project_id>-gmo`: builds the translations without installing
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(*since 0.60.0*) Returns a list containing:
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* a list of built `.mo` files
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* the maintainer `-pot` target
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* the maintainer `-update-po` target
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### i18n.merge_file()
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This merges translations into a text file using `msgfmt`. See
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[[custom_target]]
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for normal keywords. In addition it accepts these keywords:
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* `output`: same as `custom_target` but only accepts one item
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* `install_dir`: same as `custom_target` but only accepts one item
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* `install_tag`: same as `custom_target` but only accepts one item
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* `data_dirs`: (*Added 0.41.0*) list of directories for its files (See
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also `i18n.gettext()`)
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* `po_dir`: directory containing translations, relative to current directory
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* `type`: type of file, valid options are `'xml'` (default) and `'desktop'`
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* `args`: (*Added 0.51.0*) list of extra arguments to pass to `msgfmt`
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*Added 0.37.0*
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### i18n.itstool_join()
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This joins translations into a XML file using `itstool`. See
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[[custom_target]]
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for normal keywords. In addition it accepts these keywords:
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* `output`: same as `custom_target` but only accepts one item
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* `install_dir`: same as `custom_target` but only accepts one item
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* `install_tag`: same as `custom_target` but only accepts one item
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* `its_files`: filenames of ITS files that should be used explicitly
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(XML translation rules are autodetected otherwise).
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* `mo_targets` *required*: mo file generation targets as returned by `i18n.gettext()`.
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*Added 0.62.0*
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