rules:
  - id: translation-no-new-style-formatting
    patterns:
      - pattern: $FUNC("$STRING_ID", ...)
      - metavariable-regex:
          metavariable: $FUNC
          regex: '_|gettext|gettext_lazy|ngettext|ngettext_lazy'
      - metavariable-regex:
          metavariable: $STRING_ID
          regex: ".*({(\\d*|[\\w_]*)}).*"
    message: |
      Do not use str.format style formatting for translations.
      Use printf style formatting with named placeholders instead.
      For example, do `_("Hello %(name)s") % {"name": "Wagtail"}`
      instead of `_("Hello {name}").format(name="Wagtail")`.
      See https://docs.wagtail.org/en/latest/contributing/translations.html#marking-strings-for-translation for more information.
    languages: [python, javascript, typescript]
    severity: ERROR
  - id: translation-no-f-strings
    patterns:
      - pattern: $FUNC(f"...", ...)
      - metavariable-regex:
          metavariable: $FUNC
          regex: '_|gettext|gettext_lazy|ngettext|ngettext_lazy'
    message: >
      Do not use formatted string literals for translations.
      Use printf style formatting with named placeholders instead.
      For example, do `_("Hello %(name)s") % {"name": "Wagtail"}`
      instead of `_(f"Hello {name}")`.
      See https://docs.wagtail.org/en/latest/contributing/translations.html#marking-strings-for-translation for more information.
    languages: [python]
    severity: ERROR
  - id: translation-no-anonymous-arguments
    patterns:
      - pattern: $FUNC("$STRING_ID", ...)
      - metavariable-regex:
          metavariable: $FUNC
          regex: '_|gettext|gettext_lazy|ngettext|ngettext_lazy'
      - metavariable-regex:
          metavariable: $STRING_ID
          regex: ".*%\\w.*"
    message: >
      Do not use anonymous placeholders for translations.
      Use printf style formatting with named placeholders instead.
      For example, do `_("Hello %(name)s") % {"name": "Wagtail"}`
      instead of `_("Hello %s") % "Wagtail"`.
      See https://docs.wagtail.org/en/latest/contributing/translations.html#marking-strings-for-translation for more information.
    languages: [python, javascript, typescript]
    severity: ERROR
  - id: translation-no-format-within-gettext-python
    patterns:
      - pattern: $FUNC("..." % ..., ...)
      - metavariable-regex:
          metavariable: $FUNC
          regex: '_|gettext|gettext_lazy|ngettext|ngettext_lazy'
    message: >
      Do not format string before translations
      or the interpolated value will be part of the key.
      Instead, interpolate after the call to gettext.
      For example, do `_("Hello %(name)s") % {"name": "Wagtail"}`
      instead of `_("Hello %(name)s" % {"name": "Wagtail"} )`.
      See https://docs.wagtail.org/en/latest/contributing/translations.html#marking-strings-for-translation for more information.
    languages: [python]
    severity: ERROR
  - id: translation-no-format-within-gettext-javascript
    patterns:
      - pattern: $FUNC("...".replace(...), ...)
      - metavariable-regex:
          metavariable: $FUNC
          regex: '_|gettext|gettext_lazy|ngettext|ngettext_lazy'
    message: >
      Do not format string before translations
      or the interpolated value will be part of the key.
      Instead, interpolate after the call to gettext.
      For example, do `_("Hello %(name)s") % {"name": "Wagtail"}`
      instead of `_("Hello %(name)s" % {"name": "Wagtail"} )`.
      See https://docs.wagtail.org/en/latest/contributing/translations.html#marking-strings-for-translation for more information.
    languages: [javascript, typescript]
    severity: ERROR