erk

erk

#!/bin/bash

#
# Attach reviewed-by etc tags to the latest commit.
#

set -e
progname=$(basename "$0")

function usage () {
	echo "usage: $progname (r-b|a-b|t-b) (alias)" 1>&2
	exit 1
}

if [ "$#" != 2 ]; then
	usage
fi

function parse_tag_type () {
	case $1 in
		r-b) echo 'Reviewed-by:' ;;
		t-b) echo 'Tested-by:' ;;
		a-b) echo 'Acked-by:' ;;
		*) usage; exit 1 ;;
	esac
}

function parse_tag_name () {
	grep -oP "^$1\s+\K.*$" ~/.erkmap || usage
}

tag="$(parse_tag_type $1) $(parse_tag_name $2)"

if git show | grep -F "$tag" > /dev/null; then
	echo 'Tag already present.'
	exit 0		# successfully did nothing.
fi

filter="cat && echo '"$tag"'"
echo "$tag"
git filter-branch -f --msg-filter "$filter" HEAD^..HEAD > /dev/null
exit 0			# successfully added the tag.

Quick howto:

Put aliases in your ~/.erkmap like so:

hacker   J. Random Hacker <[email protected]>

Then this is useful for tacking on r-b etc while doing an interactive rebase:

pick <some commit>
x erk r-b hacker
pick <some other commit>
x erk r-b hacker

At the conclusion of the interactive rebase, both commits will have gained a line in the final paragraph of their commit message:

Reviewed-by: J. Random Hacker <[email protected]>