Is it possible to make user to control app's language, not system?

Platform
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1 
#!@PYTHON@

import os
import sys
import signal
import locale
import gettext

VERSION = '@VERSION@'
pkgdatadir = '@pkgdatadir@'
localedir = '@localedir@'

sys.path.insert(1, pkgdatadir)
signal.signal(signal.SIGINT, signal.SIG_DFL)
locale.bindtextdomain('lrcmake', localedir)
locale.textdomain('lrcmake')
gettext.install('lrcmake', localedir)

if __name__ == '__main__':
    import gi

    from gi.repository import Gio
    resource = Gio.Resource.load(os.path.join(pkgdatadir, 'lrcmake-gtk.gresource'))
    resource._register()

    from lrcmake import main
    sys.exit(main.main(VERSION, localedir))

In this autogenerated file, locale is set by system locale, how can I make it to select language by user’s configuration not by system? For example from GSchema.

2

You can’t, because that’s not how gettext works.

Gettext uses environment variables to set up the localisation details; environment variables can only be set at startup.

You could call setlocale() to set the locale to a specific value, but there is no mechanism to change the localised strings at run time, so you’d have to do it before setting up your UI anyway.

1 Like
3

I have tried setlocale method, but when I’m trying to set any locale differs from ru_RU or en_US, I’ve got this error locale.Error: unsupported locale setting.
Is this because locale using system locales instead ones in lang.po files?

#!@PYTHON@

import os
import sys
import signal
import locale
import gettext

VERSION = '@VERSION@'
pkgdatadir = '@pkgdatadir@'
localedir = '@localedir@'

sys.path.insert(1, pkgdatadir)
signal.signal(signal.SIGINT, signal.SIG_DFL)
locale.bindtextdomain('lrcmake', localedir)
locale.textdomain('lrcmake')
gettext.install('lrcmake', localedir)

if __name__ == '__main__':
    import gi

    from gi.repository import Gio
    resource = Gio.Resource.load(os.path.join(pkgdatadir, 'lrcmake-gtk.gresource'))
    resource._register()
    from lrcmake import shared
    if not shared.schema.get_boolean("use-sys-lang"):
        print(locale.normalize(shared.state_schema.get_string("lang"))[:5])
        locale.setlocale(locale.LC_ALL, locale.normalize(shared.state_schema.get_string("lang"))[:5])

    from lrcmake import main
    sys.exit(main.main(VERSION, localedir))
4

This is because there are no installed locales for that language; how to generate/install locales is part of your distribution, and GNOME or GTK have nothing to do with it.

No, this has nothing to do with that. Just because you have a ${LANG}.po file doesn’t mean there’s a valid locale. First of all, the po files are “sources”, that get converted into a localisation manifest; then you also need the locale data for a specific language, which is part of your OS, not your application, and since locale data can be arbitrarily large, most distribution do not ship it by default: you have to install it manually.

1 Like
5

Well, I get it. Thank you.

6

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