Honor custom catalog paths when activating translations

src/humanize/i18n.py

@@ -51,7 +51,7 @@ def _get_default_locale_path() -> pathlib.Path | None:
 
 
 def get_translation() -> gettext_module.NullTranslations:
-    return _TRANSLATIONS.get(getattr(_CURRENT, "locale", None), _TRANSLATIONS[None])
+    return getattr(_CURRENT, "translation", _TRANSLATIONS[None])
 
 
 def activate(
@@ -74,8 +74,10 @@ def activate(
     """
     if locale is None or locale.startswith("en"):
         _CURRENT.locale = None
+        _CURRENT.translation = _TRANSLATIONS[None]
         return _TRANSLATIONS[None]
 
+    default_path = path is None
     if path is None:
         path = _get_default_locale_path()
 
@@ -85,16 +87,21 @@ def activate(
             "You need to pass the path explicitly."
         )
         raise FileNotFoundError(msg)
-    if locale not in _TRANSLATIONS:
+    if default_path and locale in _TRANSLATIONS:
+        translation = _TRANSLATIONS[locale]
+    else:
         translation = gettext_module.translation("humanize", path, [locale])
-        _TRANSLATIONS[locale] = translation
+        if default_path:
+            _TRANSLATIONS[locale] = translation
     _CURRENT.locale = locale
-    return _TRANSLATIONS[locale]
+    _CURRENT.translation = translation
+    return translation
 
 
 def deactivate() -> None:
     """Deactivate internationalisation."""
     _CURRENT.locale = None
+    _CURRENT.translation = _TRANSLATIONS[None]
 
 
 def _gettext(message: str) -> str:

tests/test_i18n.py

@@ -6,6 +6,7 @@
 import gettext
 import importlib
 import shutil
+import struct
 import subprocess
 from pathlib import Path
 
@@ -20,6 +21,34 @@
     NOW = dt.datetime.now(tz=dt.UTC)
 
 
+def test_activate_uses_catalog_from_requested_path(tmp_path: Path) -> None:
+    def write_catalog(root: Path, translated: str) -> None:
+        directory = root / "zz" / "LC_MESSAGES"
+        directory.mkdir(parents=True)
+        original = b"one"
+        translation = translated.encode("utf-8")
+        data = struct.pack("<7I", 0x950412DE, 0, 1, 28, 36, 0, 0)
+        data += struct.pack("<2I", len(original), 44)
+        data += struct.pack("<2I", len(translation), 48)
+        data += original + b"\0" + translation + b"\0"
+        (directory / "humanize.mo").write_bytes(data)
+
+    first = tmp_path / "first"
+    second = tmp_path / "second"
+    write_catalog(first, "first")
+    write_catalog(second, "second")
+    try:
+        first_translation = humanize.activate("zz", first)
+        assert humanize.apnumber(1) == "first"
+        second_translation = humanize.activate("zz", second)
+        assert humanize.apnumber(1) == "second"
+        assert first_translation is not second_translation
+        humanize.activate("zz", first)
+        assert humanize.apnumber(1) == "first"
+    finally:
+        humanize.deactivate()
+
+
 @pytest.mark.parametrize("locale, one", [("de_DE", "eins"), ("fr_FR", "un")])
 def test_update_translations(
     tmp_path: Path, monkeypatch: pytest.MonkeyPatch, locale: str, one: str