#!/bin/sh

# Sets: new_commits
# Assumes: $oldrev, $newrev, and $refname
#
# This is for use in post receive hooks, as it assumes the refname has moved and
# is now newrev, we need to discard it. This is down with bash string replace,
# as it will replace only the first match, compared to the canonical "grep -v"
# approach which will throw out multiple matches if the same commit is referred
# to by multiple branches.
function set_new_commits() {
	nl=$'\n'

	# Get all the current branches, not'd as we want only new ones
	new_commits=$(git rev-parse --not --branches)

	# Strip off the not current branch
	new_hash=$(git rev-parse $refname)
	new_commits=${new_commits/^$new_hash/}

	# Put back newrev without the not
	new_commits=${new_commits}${nl}${newrev}

	# Put in ^oldrev if it's not a new branch
	if [ "$oldrev" != "0000000000000000000000000000000000000000" ] ; then
		new_commits=${new_commits}${nl}^${oldrev}
	fi

	new_commits=${new_commits/$nl$nl/$nl}
	new_commits=${new_commits/#$nl/}
}