#!/bin/sh
# Copyright 2018  Jonas Smedegaard <dr@jones.dk>
# Description: helper script to cherry-pick upstream patches
#
# This program is free software;
# you can redistribute it and/or modify it
# under the terms of the GNU General Public License
# as published by the Free Software Foundation;
# either version 3, or (at your option) any later version.

set -eu

TREEISH=$1
FORK=${2:-}

#DATEFORMAT='format:%Y%m%d'
DATEFORMAT='iso-strict'

if [ -n "$FORK" ]; then
	PREFIX="debian/patches/$FORK/"
	mkdir -p "debian/patches/$FORK"
else
	PREFIX="debian/patches/0"
fi

export PREFIX

git log --right-only --no-merges \
	--pretty='%h %ad' --date="$DATEFORMAT" \
	"$TREEISH" -- \
	| perl -ane '`git log -p $F[0]^..$F[0] > $ENV{PREFIX}$F[1]~$F[0].patch`'
