Git Blame script that resolves revision numbers to GitHub PR #'s, remote tags, remote or local branches

pr-blame.sh

#!/bin/bash
#
#  call with '-i' to initialize the repo

self=$(basename "$0")
TEMP="$(getopt n:w:i "$@")"
eval set -- $TEMP

REFS="refs/pr/*"
WIDTH=10

while :; do
	case "$1" in
	--)	shift;
		break
		;;
	-i)	init=1
		shift
		;;
	-n)	echo "N=$2"
		REFS="$2"
		shift 2
		;;
	-w)	echo "W=$2"
		WIDTH="$2"
		shift 2
		;;
	*)	echo "Bad: $1"
		exit 1 ;;
	esac
done

origin=$(git rev-parse --symbolic-full-name @{upstream} | sed 's!.*remotes/!!;s!/.*!!')

if [ -n "$init" ]
then
	[ -z "$origin" ] && origin=origin
	if [ -n "$(set -x; git config --get-regexp "remote.$origin.fetch" "^\+?refs/pull/\*/head:.*")" ]
	then
		echo "Already configured?"
		(set -x; git config --get-regexp "remote.$origin.fetch")
	else
		(set -x; git config --add "remote.$origin.fetch" "+refs/pull/*/head:refs/pr/*")
		(set -x; git remote show $origin | egrep -i 'remote|refs/pull' ) |
			(head; echo "	...etc...")
		(set -x; git fetch --quiet $origin)
	fi
	[ -z "$1" ] && exit 0
fi

git blame -l "$@" |
	git name-rev --refs=$REFS --name-only --stdin |
	git name-rev --refs=refs/tags/* --name-only --stdin |
	git name-rev --refs=refs/$origin/* --name-only --stdin |
	git name-rev --refs=refs/heads/* --name-only --stdin |
	perl -ple 's{^(\S+)( \()}{sprintf("%'"$WIDTH"'s%s", $1, $2)}e'