[gcc r9-9600] contrib: add git-commit-mklog wrapper

[Martin Liska <marxin@gcc.gnu.org>]

https://gcc.gnu.org/g:108b3dd830a73b37df3b2828b8293555b0d05254

commit r9-9600-g108b3dd830a73b37df3b2828b8293555b0d05254
Author: Martin Liska <mliska@suse.cz>
Date:   Wed Jun 23 09:48:15 2021 +0200

    contrib: add git-commit-mklog wrapper
    
    contrib/ChangeLog:
    
            * git-commit-mklog.py: New file.

Diff:
---
 contrib/git-commit-mklog.py | 53 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/contrib/git-commit-mklog.py b/contrib/git-commit-mklog.py
new file mode 100755
index 00000000000..9c59fb97809
--- /dev/null
+++ b/contrib/git-commit-mklog.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2020 Free Software Foundation, Inc.
+#
+# This file is part of GCC.
+#
+# GCC is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GCC is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING.  If not, write to
+# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+# Boston, MA 02110-1301, USA.
+#
+# The script is wrapper for git commit-mklog alias where it parses
+# -b/--pr-numbers argument and passes it via environment variable
+# to mklog.py script.
+
+import argparse
+import os
+import subprocess
+
+if __name__ == '__main__':
+    children_args = []
+    myenv = os.environ.copy()
+
+    parser = argparse.ArgumentParser(description='git-commit-mklog wrapped')
+    parser.add_argument('-b', '--pr-numbers', action='store',
+                        type=lambda arg: arg.split(','), nargs='?',
+                        help='Add the specified PRs (comma separated)')
+    parser.add_argument('-p', '--fill-up-bug-titles', action='store_true',
+                        help='Download title of mentioned PRs')
+    args, unknown_args = parser.parse_known_args()
+
+    myenv['GCC_FORCE_MKLOG'] = '1'
+    mklog_args = []
+    if args.pr_numbers:
+        mklog_args.append(f'-b {",".join(args.pr_numbers)}')
+    if args.fill_up_bug_titles:
+        mklog_args.append('-p')
+
+    if mklog_args:
+        myenv['GCC_MKLOG_ARGS'] = ' '.join(mklog_args)
+
+    commit_args = ' '.join(unknown_args)
+    subprocess.run(f'git commit {commit_args}', shell=True, env=myenv)