#!/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
while read branch eh
do
	case "$eh" in
	"") git merge "$branch" || break ;;
	?*) echo >&2 "Eh? $branch $eh"; break ;;
	esac
done <<EOF'

git log --pretty=oneline --first-parent "$1" |
{
	series=
	while read commit msg
	do
		other=$(git rev-parse --verify "$commit^2") &&
		branch=$(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? $other"
		}
		if test -z "$series"
		then
			series="$merged"
		else
			series="$merged$LF$series"
		fi
	done
	echo "$series"
}

echo 'EOF'