Initial commit

env/lib/python3.10/site-packages/wagtail/locales/forms.py

@@ -0,0 +1,36 @@
+from django import forms
+from django.utils.translation import gettext_lazy as _
+
+from wagtail.coreutils import get_content_languages
+from wagtail.models import Locale
+
+
+class LocaleForm(forms.ModelForm):
+    required_css_class = "required"
+    language_code = forms.ChoiceField(
+        label=_("Language"), choices=get_content_languages().items()
+    )
+
+    def __init__(self, *args, **kwargs):
+        instance = kwargs.get("instance")
+        super().__init__(*args, **kwargs)
+
+        # Get language codes that are already used
+        used_language_codes = Locale.objects.values_list("language_code", flat=True)
+
+        self.fields["language_code"].choices = [
+            (language_code, display_name)
+            for language_code, display_name in get_content_languages().items()
+            if language_code not in used_language_codes
+            or (instance and instance.language_code == language_code)
+        ]
+
+        # If the existing language code is invalid, add an empty value so Django doesn't automatically select a random language
+        if instance and not instance.language_code_is_valid():
+            self.fields["language_code"].choices.insert(
+                0, (None, _("Select a new language"))
+            )
+
+    class Meta:
+        model = Locale
+        fields = ["language_code"]