Record all contributors to each Git repository in a file tree

list_all_contributors.sh

#!/bin/bash

# list_all_contributors.sh ROOT_SEARCH_PATH
#
# Usage: Finds all Git repositories in ROOT_SEARCH_PATH and records all
#        contributors to each repo, each repo getting one file, with these
#        contributor files saved to the current directory.

# Copyright (C) 2021  Leland Batey
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program 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 Affero General Public License for more details.
#
# Find the GNU Affero General Public License at <https://www.gnu.org/licenses/>.

SCAN_DIR="$1"

# Find all the '.git' folders then strip the '/.git' suffix leaving only the
# repo paths
GIT_REPOS="$(find "${SCAN_DIR}" -name "*.git" -type d | sed 's/\/.git$//g')"

# Creates a filename to be used to store the list of git contributors for the
# repo. Requires a prefix and a path, returns the filename. Filename will be
# rougly equal to path.trimprefix(prefix).replace('/', '_').
# :param $1: string prefix
# :param $2: string path
function create_sanitize_usrlist_filename() {
	python3 -c "import sys
prefix = sys.argv[1]
paths = sys.argv[2].split('\n')
for x in paths:
	noprx = x.replace(prefix, '', 1)
	if noprx[0] == '/':
		noprx = noprx[1:]
	print(noprx.replace('/', '_'))
	" $@
}

#create_sanitize_usrlist_filename "/home/leland/projects/repos" "/home/leland/projects/repos/python/foo/bar"

function printgitcontributors() {
	cd "$1"
	git shortlog HEAD --summary --numbered --email
}

CWD="$PWD"
for fn in $GIT_REPOS; do
	OUTPUT_FN="$(create_sanitize_usrlist_filename "${SCAN_DIR}" "${fn}" )"
	echo "date ${CWD}/${OUTPUT_FN} "
	printgitcontributors "$fn" > "${CWD}/${OUTPUT_FN}"
	cd "$CWD"
done