[damned-lies] Add --locale option to compile-trans command

[Claude Paroz <claudep src gnome org>]

commit 6b903da535e94bebcf6b044c27df60f2f364b5e0
Author: Claude Paroz <claude 2xlibre net>
Date:   Sun Mar 21 17:52:37 2021 +0100

    Add --locale option to compile-trans command

 stats/management/commands/compile-trans.py | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)
---
diff --git a/stats/management/commands/compile-trans.py b/stats/management/commands/compile-trans.py
index 3387e2e6..7954aec1 100644
--- a/stats/management/commands/compile-trans.py
+++ b/stats/management/commands/compile-trans.py
@@ -10,6 +10,14 @@ from languages.models import Language
 class Command(BaseCommand):
     help = "Compile translations of djamnedlies"
 
+    def add_arguments(self, parser):
+        # Copy --locale arg from compilemessages
+        parser.add_argument(
+            '--locale', '-l', action='append', default=[],
+            help='Locale(s) to process (e.g. de_AT). Default is to process all. '
+                 'Can be used multiple times.',
+        )
+
     def handle(self, **options):
         # Copy all po/ll.po files in locale/ll/LC_MESSAGES/django.po
         podir = settings.BASE_DIR / 'po'
@@ -17,12 +25,19 @@ class Command(BaseCommand):
             if pofile.suffix != ".po":
                 continue
             lang_code = pofile.stem
+            if options['locale'] and lang_code not in options['locale']:
+                continue
             localedir = (
                 settings.BASE_DIR / 'locale' / Language.django_locale(lang_code) / 'LC_MESSAGES'
             )
             if not localedir.is_dir():
                 localedir.mkdir(parents=True, exist_ok=True)
+            if options['verbosity'] > 1:
+                self.stdout.write(f"Copying {pofile} to {localedir}")
             shutil.copy(pofile, localedir / 'django.po')
 
         # Run compilemessages -l ll
-        call_command('compilemessages')
+        call_command(
+            'compilemessages',
+            locale=[Language.django_locale(locale) for locale in options['locale']]
+        )