#!/bin/sh

merge_msg="Merge branch '\(.*\)'"
x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
x40="$x40$x40$x40$x40$x40$x40$x40$x40"
LF='
'

echo '#!/bin/sh
accept_rerere=t
while case "$#,$1" in 0,*) break;; *,-*) ;; *) break ;; esac
do
	case "$1" in
	-n)	accept_rerere= ;;
	*)	echo "$0 [-n]"; exit 1 ;;
	esac
	shift
done

accept_rerere () {
	if test -z "$accept_rerere"
	then
		return 1
	fi
	if git diff |
	   grep -e "^.+" -e "^+." |
	   grep -e "^..<<<<<<<" -e "^..=======" -e "^..>>>>>>>" >/dev/null
	then
		return 1
	else
		EDITOR=: git commit -a
		return 0
	fi
}

while read branch eh
do
	case "$eh" in
	"")
		echo >&2 "* $branch"
		git merge "$branch" || accept_rerere || exit ;;
	pick" "*)
		echo >&2 "* $eh"
		git cherry-pick "$branch" || exit ;;
	*) echo >&2 "Eh? $branch $eh"; exit ;;
	esac
done <<EOF'

show_merge () {
	branch=$(expr "$msg" : "$merge_msg") &&
	tip=$(git rev-parse --verify "refs/heads/$branch" 2>/dev/null) &&
	merged=$(git name-rev --refs="refs/heads/$branch" "$other" 2>/dev/null) &&
	merged=$(expr "$merged" : "$x40 \(.*\)") &&
	test "$merged" != undefined || {
		other=$(git log -1 --pretty='format:%s' $other) &&
		merged="$branch :rebased? $other"
	}
}

show_pick () {
	merged="$(git rev-parse --verify "$commit") pick $msg" 
}

git log --pretty=oneline --first-parent "$1" |
{
	series=
	while read commit msg
	do
		if other=$(git rev-parse -q --verify "$commit^2")
		then
			show_merge
		else
			show_pick
		fi

		if test -z "$series"
		then
			series="$merged"
		else
			series="$merged$LF$series"
		fi
	done
	echo "$series"
}

echo 'EOF'