added backend translation support for plurals

mealie/pkgs/i18n/json_provider.py

@@ -1,6 +1,7 @@
 import json
 from dataclasses import dataclass
 from pathlib import Path
+from typing import cast
 
 
 @dataclass(slots=True)
@@ -13,6 +14,22 @@ class JsonProvider:
         else:
             self.translations = path
 
+    def _parse_plurals(self, value: str, count: float):
+        # based off of: https://kazupon.github.io/vue-i18n/guide/pluralization.html
+
+        values = [v.strip() for v in value.split("|")]
+        if len(values) == 1:
+            return value
+        elif len(values) == 2:
+            return values[0] if count == 1 else values[1]
+        elif len(values) == 3:
+            if count == 0:
+                return values[0]
+            else:
+                return values[1] if count == 1 else values[2]
+        else:
+            return values[0]
+
     def t(self, key: str, default=None, **kwargs) -> str:
         keys = key.split(".")
 
@@ -30,9 +47,12 @@ class JsonProvider:
 
             if i == last:
                 for key, value in kwargs.items():
-                    if not value:
+                    translation_value = cast(str, translation_value)
+                    if value is None:
                         value = ""
-                    translation_value = translation_value.replace("{" + key + "}", value)
-                return translation_value
+                    if key == "count":
+                        translation_value = self._parse_plurals(translation_value, float(value))
+                    translation_value = translation_value.replace("{" + key + "}", str(value))  # type: ignore
+                return translation_value  # type: ignore
 
         return default or key

tests/unit_tests/pkgs/i18n/test_locale_provider.py

@@ -9,6 +9,29 @@ def test_json_provider():
     assert provider.t("test2", "DEFAULT") == "DEFAULT"
 
 
+def test_json_provider_plural():
+    provider = JsonProvider({"test": "test | tests"})
+    assert provider.t("test", count=0) == "tests"
+    assert provider.t("test", count=0.5) == "tests"
+    assert provider.t("test", count=1) == "test"
+    assert provider.t("test", count=1.5) == "tests"
+    assert provider.t("test", count=2) == "tests"
+
+    provider = JsonProvider({"test": "test 0 | test | tests"})
+    assert provider.t("test", count=0) == "test 0"
+    assert provider.t("test", count=0.5) == "tests"
+    assert provider.t("test", count=1) == "test"
+    assert provider.t("test", count=1.5) == "tests"
+    assert provider.t("test", count=2) == "tests"
+
+    provider = JsonProvider({"test": "zero tests | one test | {count} tests"})
+    assert provider.t("test", count=0) == "zero tests"
+    assert provider.t("test", count=0.5) == "0.5 tests"
+    assert provider.t("test", count=1) == "one test"
+    assert provider.t("test", count=1.5) == "1.5 tests"
+    assert provider.t("test", count=2) == "2 tests"
+
+
 def test_json_provider_nested_keys():
     nested_dict = {
         "root": {