stale translations script

Signed-off-by: crueter <crueter@eden-emu.dev>

tools/README.md

@@ -20,8 +20,12 @@ Tools for Eden and other subprojects.
 - `lanczos_gen.c`
 - `clang-format.sh`: Runs `clang-format` on the entire codebase.
     * Requires: clang
-- `unused-strings.sh`: Finds unused strings in Android `strings.xml` files.
-    * It's recommended to run this after almost any Android change; this operation is relatively fast.
+
+## Android
+It's recommended to run these scritps after almost any Android change, as they are relatively fast and important both for APK bloat and CI.
+
+- `unused-strings.sh`: Finds unused strings in `strings.xml` files.
+- `stale-translations.sh`: Finds translated strings that aren't present in the source `strings.xml` file.
 
 ## Translations
 

tools/stale-translations.sh

@@ -0,0 +1,34 @@
+#!/bin/sh -e
+
+# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+ANDROID=src/android/app/src/main
+STRINGS=$ANDROID/res/values/strings.xml
+
+TMP_DIR=$(mktemp -d)
+
+SRC="$TMP_DIR"/src
+LOCALES="$TMP_DIR"/locales
+TRANSLATED="$TMP_DIR"/translated
+COMBINED="$TMP_DIR"/combined
+
+# We start out by getting the list of source strings so we can compare all locale strings to this
+grep -e "string name" $STRINGS | grep -v 'translatable="false"' | cut -d'"' -f2 > "$SRC"
+
+# ... then we determine what locales to check
+find $ANDROID/res/values-* -name 'strings.xml' > "$LOCALES"
+
+while IFS= read -r locale; do
+	echo "Locale $(echo "$locale" | cut -d"-" -f2- | cut -d"/" -f1)"
+	grep -e "string name" "$locale" | cut -d'"' -f2 > "$TRANSLATED"
+	cat "$TRANSLATED" "$SRC" | sort | uniq -u > "$COMBINED"
+
+	# This will also include strings that are present in the source but NOT translated, so we filter those out now:
+	while IFS= read -r unused; do
+		{ grep -e "string name=\"$unused\"" "$STRINGS" >/dev/null; } || \
+		{ echo "-- Removing unused translation $unused" && sed "/string name=\"$unused\"/d" "$locale" > "$locale.new" && mv "$locale.new" "$locale"; }
+	done < "$COMBINED"
+
+	echo "-- done"
+done < "$LOCALES"