#!/bin/sh
#
# git-cherry-move, Copyright © 2011 Matteo Cypriani
#
# This program is free software. It comes without any warranty, to
# the extent permitted by applicable law. You can redistribute it
# and/or modify it under the terms of the Do What The Fuck You Want
# To Public License, Version 2, as published by Sam Hocevar. See
# http://sam.zoy.org/wtfpl/COPYING for more details.
#
# This script moves a commit from a branch head to another. It is
# the equivalent of git cherry-pick followed by git reset.

set -e

USAGE=$(cat <<EOF
Usage:
  $0 <src-branch> <dst-branch> [ reset-arg ]

'reset-arg' is passed to the final reset (can be --hard for example).
EOF
)

assert_branch_exists()
{
	if ! git for-each-ref refs/heads | grep "/${1}$" >/dev/null ; then
		echo "The branch $1 does not exist!"
		exit 2
	fi
}

if [ $# -lt 2 ] ; then
	printf '%s\n' "$USAGE" >&2
	exit 1
fi

assert_branch_exists "$1"
SRC="$1"
shift

assert_branch_exists "$1"
DST="$1"
shift


git checkout "$DST"
git cherry-pick "$SRC"
git checkout "$SRC"
git reset "$1" HEAD^