gh-77393: Add --statistics opt to msgfmt.py

Lib/test/test_tools/test_msgfmt.py

@@ -169,6 +169,12 @@ def test_no_input_file(self):
     def test_nonexistent_file(self):
         assert_python_failure(msgfmt, 'nonexistent.po')
 
+    def test_statistics(self):
+        with temp_cwd():
+            res = assert_python_ok(msgfmt, '--statistics', data_dir / "general.po")
+            out = res.out.decode('utf-8').strip()
+            self.assertEqual('7 translated messages, 1 untranslated message.', out)
+
 
 def update_catalog_snapshots():
     for po_file in data_dir.glob('*.po'):

Misc/NEWS.d/next/Tools-Demos/2025-04-05-18-13-00.gh-issue-77393.msgid28.rst

@@ -0,0 +1 @@
+Added ``--statistics`` option to :program:`msgfmt`.

Tools/i18n/msgfmt.py

@@ -23,6 +23,9 @@
     -V
     --version
         Display version information and exit.
+
+    --statistics
+        Print statistics about translations.
 """
 
 import os
@@ -229,11 +232,12 @@ def make(filename, outfile):
 def main():
     try:
         opts, args = getopt.getopt(sys.argv[1:], 'hVo:',
-                                   ['help', 'version', 'output-file='])
+                                   ['help', 'version', 'output-file=', 'statistics'])
     except getopt.error as msg:
         usage(1, msg)
 
     outfile = None
+    print_statistics = False
     # parse options
     for opt, arg in opts:
         if opt in ('-h', '--help'):
@@ -243,6 +247,8 @@ def main():
             sys.exit(0)
         elif opt in ('-o', '--output-file'):
             outfile = arg
+        elif opt in ('--statistics',):
+            print_statistics = True
     # do it
     if not args:
         print('No input file given', file=sys.stderr)
@@ -252,6 +258,22 @@ def main():
     for filename in args:
         make(filename, outfile)
 
+        if print_statistics:
+            strings = translated = 0
+            for msgid, msgstr in MESSAGES.items():
+                if msgid == b'':
+                    continue
+                strings += 1
+                if msgstr.strip():
+                    translated += 1
+
+            untranslated = strings - translated
+            message = f"{translated} translated message{'s' if translated != 1 else ''}"
+            if untranslated > 0:
+                message += f", {untranslated} untranslated message{'s' if untranslated != 1 else ''}"
+            message += "."
+            print(message)
+
 
 if __name__ == '__main__':
     main()