1 files changed, 68 insertions, 0 deletions
diff --git a/git_contributors.py b/git_contributors.py
new file mode 100644
index 0000000..91a7f6a
--- /dev/null
+++ b/git_contributors.py
@@ -0,0 +1,68 @@
+#!/usr/bin/python3
+
+# List all contributors to a series of git commits.
+# Copyright(C) 2022 Darrick J. Wong, All Rights Reserved.
+# Licensed under GPL 2.0 or later
+
+import re
+import subprocess
+import io
+import sys
+import argparse
+
+DEBUG = False
+
+def backtick(args):
+	'''Generator function that yields lines of a program's stdout.'''
+	if DEBUG:
+		print(' '.join(args))
+	p = subprocess.Popen(args, stdout = subprocess.PIPE)
+	for line in io.TextIOWrapper(p.stdout, encoding="utf-8"):
+		yield line.strip()
+
+def get_developers(revspec):
+	"""Return the address list generated from signed-off-by and
+	acked-by lines in the message.
+	"""
+	addr_list = ['[email protected]', '[email protected]']
+	tags = '%s|%s|%s|%s|%s|%s|%s|%s' % (
+		'signed-off-by',
+		'acked-by',
+		'cc',
+		'reviewed-by',
+		'reported-by',
+		'tested-by',
+		'suggested-by',
+		'reported-and-tested-by')
+	regex1 = r'^(%s):\s+(.+)$' % tags
+	regex2 = r'^(%s):\s+.+<(.+)>$' % tags
+
+	r1 = re.compile(regex1, re.I)
+	r2 = re.compile(regex2, re.I)
+
+	for output in backtick(['git', 'log', '--pretty=medium', revspec]):
+		m = r2.match(output)
+		if m:
+			addr_list.append(m.expand(r'\g<2>'))
+			continue
+		m = r1.match(output)
+		if m:
+			addr_list.append(m.expand(r'\g<2>'))
+
+	return set(addr_list)
+
+def main():
+	parser = argparse.ArgumentParser(description = "List email addresses of contributors to a series of git commits.")
+	parser.add_argument("revisions", nargs = 1, \
+			help = "git revisions to process.")
+	parser.add_argument("--delimiter", type = str, default = '\n', \
+			help = "Separate each email address with this string.")
+	args = parser.parse_args()
+
+	contributors = get_developers(args.revisions[0])
+
+	print(args.delimiter.join(sorted(contributors)))
+	return 0
+
+if __name__ == '__main__':
+	sys.exit(main())