[tools] Add a command for translating into a new language

Signed-off-by: Roman Tsisyk <roman@tsisyk.com>

tools/python/strings_utils.py

@@ -484,6 +484,15 @@ class StringsTxt:
         self.print_strings_with_wrong_placeholders(langs=args.langs)
         return not self.validation_errors
 
+    def translate(self, source_language, target_language):
+        from translate import translate_one
+        self._print_header(f"Translating from {source_language} to {target_language}...")
+        for key, source in self.translations_by_language[source_language].items():
+            if key in self.translations_by_language[target_language]:
+                continue
+            translation = translate_one(source, source_language, target_language)
+            print(f'{source} -> {translation}')
+            self.add_translation(translation, key, target_language)
 
 def find_project_root():
     my_path = abspath(__file__)
@@ -585,6 +594,14 @@ def get_args():
         before punctuation, etc; exit with error if not valid"""
     )
 
+    parser.add_argument(
+        "-tr", "--translate",
+        nargs=2,
+        dest="translate",
+        metavar=('source_lang', 'target_lang'),
+        help="""translate SOURCE_LANG into TARGET_LANG"""
+    )
+
     return parser.parse_args()
 
 
@@ -630,6 +647,11 @@ if __name__ == "__main__":
             print("\n\033[0;31mThe file is not valid, terminating\033[0m")
             sys.exit(1)
 
+    if args.translate:
+        if not args.output:
+            args.output = True
+        strings.translate(args.translate[0], args.translate[1])
+
     if args.output:
         if args.output == True:
             args.output = args.input

tools/python/translate.py

@@ -100,6 +100,15 @@ def google_translate(text, source_language):
     print(lang + ' = ' + line)
   return translations
 
+def google_translate_one(text, source_language, target_language):
+  fromTo = source_language.lower() + ':' + target_language.lower()
+  res = subprocess.run([TRANS_CMD, '-b', '-no-bidi', fromTo, text], text=True, capture_output=True)
+  if res.returncode != 0:
+    print(f'Error running {TRANS_CMD} program:')
+    print(res.stderr)
+    exit(1)
+  return res.stdout.splitlines()[0]
+
 def deepl_translate_one(text, source_language, target_language):
   url = 'https://api-free.deepl.com/v2/translate'
   payload = {
@@ -114,6 +123,14 @@ def deepl_translate_one(text, source_language, target_language):
   json = response.json()
   return json['translations'][0]['text']
 
+def translate_one(text, source_language, target_language):
+  if target_language in DEEPL_TARGET_LANGUAGES:
+    return deepl_translate_one(text, source_language, target_language)
+  elif target_language in GOOGLE_TARGET_LANGUAGES:
+    return google_translate_one(text, source_language, target_language)
+  else:
+    raise ValueError(f'Unsupported target language {target_language}')
+
 def deepl_translate(text, source_language):
   translations = {}
   print('Deepl translations:')