[PATCH 1/1] scripts: Add add-maintainer.py

[Guru Das Srinagesh]

This script runs get_maintainer.py on a given patch file and adds its
output to the patch file in place with the appropriate email headers
"To: " or "Cc: " as the case may be. These new headers are added after
the "From: " line in the patch.

Currently, maintainers are added as "To: ", mailing lists are added as
"Cc: " and all others are addded as "Cc: " as well.

The script is quiet by default (only prints errors) and its verbosity
can be adjusted via an optional parameter.

Signed-off-by: Guru Das Srinagesh <quic_gurus@xxxxxxxxxxx>
---
 scripts/add-maintainer.py | 82 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100755 scripts/add-maintainer.py

diff --git a/scripts/add-maintainer.py b/scripts/add-maintainer.py
new file mode 100755
index 000000000000..942d331cf8d4
--- /dev/null
+++ b/scripts/add-maintainer.py
@@ -0,0 +1,82 @@
+#! /usr/bin/env python3
+
+import argparse
+import logging
+import os
+import sys
+import subprocess
+import re
+
+def add_maintainers_to_file(patch_file):
+    # Run get_maintainer.pl on patch file
+    logging.info("Patch: {}".format(os.path.basename(patch_file)))
+    cmd = ['scripts/get_maintainer.pl']
+    cmd.extend([patch_file])
+    p = subprocess.run(cmd, stdout=subprocess.PIPE, check=True)
+    logging.debug("\n{}".format(p.stdout.decode()))
+
+    entries = p.stdout.decode().splitlines()
+
+    maintainers = []
+    lists = []
+    others = []
+
+    for entry in entries:
+        entity = entry.split('(')[0].strip()
+        if "maintainer" in entry:
+            maintainers.append(entity)
+        elif "list" in entry:
+            lists.append(entity)
+        else:
+            others.append(entity)
+
+    # Specify email headers appropriately
+    to_maintainers  = ["To: " + m for m in maintainers]
+    cc_lists        = ["Cc: " + l for l in lists]
+    cc_others       = ["Cc: " + o for o in others]
+    logging.debug("To Maintainers:\n{}".format('\n'.join(to_maintainers)))
+    logging.debug("Cc Lists:\n{}".format('\n'.join(cc_lists)))
+    logging.debug("Cc Others:\n{}".format('\n'.join(cc_others)))
+
+    # Edit patch file in place to add maintainers
+    with open(patch_file, "r") as pf:
+        lines = pf.readlines()
+
+    from_line = [i for i, line in enumerate(lines) if re.search("From: ", line)]
+    if len(from_line) > 1:
+        logging.error("Only one From: line is allowed in a patch file")
+        sys.exit(1)
+
+    next_line_after_from = from_line[0] + 1
+
+    # Reverse lists to maintain same order as in get_maintainer.py output
+    # as we will be insert()-ing the elements
+    to_maintainers.reverse()
+    cc_lists.reverse()
+    cc_others.reverse()
+
+    for o in cc_others:
+        lines.insert(next_line_after_from, o + "\n")
+    for l in cc_lists:
+        lines.insert(next_line_after_from, l + "\n")
+    for m in to_maintainers:
+        lines.insert(next_line_after_from, m + "\n")
+
+    with open(patch_file, "w") as pf:
+        pf.writelines(lines)
+
+def main():
+    parser = argparse.ArgumentParser(description='Add the respective maintainers and mailing lists to patch files')
+    parser.add_argument('patches', nargs='*', help="One or more patch files")
+    parser.add_argument('--verbosity', choices=['debug', 'info', 'error'], default='error', help="Verbosity level of script output")
+    args = parser.parse_args()
+
+    logging.basicConfig(level=args.verbosity.upper(), format='%(levelname)s: %(message)s')
+
+    for patch in args.patches:
+        add_maintainers_to_file(patch)
+
+    logging.info("Maintainers added to all patch files successfully")
+
+if __name__ == "__main__":
+    main()
-- 
2.40.0