translations.py

#!/usr/bin/env python

# If you are on macOS and using brew, you might need the following first:
# export PATH="/usr/local/opt/gettext/bin:$PATH"

from plumbum import local, FG
from plumbum.cmd import xgettext, msgmerge, msgfmt

translation_dir = local.cwd / 'plumbum/cli/i18n'
template = translation_dir / 'messages.pot'

xgettext['--from-code',
         'utf-8',
         '-L', 'python',
         '--keyword=T_',
         '--package-name=Plumbum.cli',
         '-o', template,
         sorted([x - local.cwd for x in local.cwd / 'plumbum/cli' // '*.py']),
         ] & FG

for translation in translation_dir // '*.po':
    lang = translation.stem
    new_tfile = translation.with_suffix('.po.new')

    # Merge changes to new file
    (msgmerge[translation, template] > new_tfile) & FG

    new_tfile.move(translation)

    # Render new file into runtime output
    local_dir = translation_dir / lang / 'LC_MESSAGES'
    if not local_dir.exists():
        local_dir.mkdir()
    msgfmt['-o',  local_dir / 'plumbum.cli.mo', translation] & FG