Script for automating co-authored commit messages to facilitate pair programming

pair-commit.sh

#!/usr/bin/env bash

# Based on https://github.com/spinningarrow/git-coauthors/

# Runs "git commit" and initializes the commit editor with a co-authorship trailer
# matching the argument you provided. Will only search past commiters to the current
# repo and branch.
#
# $ pair-commit melba
#   -> Opens up commit editor populated with the following trailer:
#      "Co-authored-by: Melba Roy Mouton <mrmoulton@nasa.gov>"
#
# You can pass the "-s" flag to output the trailer without starting a commit.
#
# $ pair-commit -s melba
#   -> Returns "Co-authored-by: Melba Roy Mouton <mrmoulton@nasa.gov>"

search_term=${!#}
trailer=$(git shortlog -sne | cut -f2- | awk '{ print "Co-authored-by: " $0; }' | grep -i $search_term)
command="git commit --trailer"

while getopts 's' opt; do
case $opt in
    s) command="echo" ;;
esac
done

$command "$trailer"