#!/bin/sh

master_sha1=`git rev-parse --verify refs/heads/master`
LF='
'
(cd .git/refs/heads && find -type f) |
sed -n \
    -e 's/^\.\///' \
    -e '/^[^\/][^\/]\//p' |
while read topic
do
	case " $* " in
	*' '"$topic"' '*)
		echo >&2 "* Skipping $topic"
		continue ;;
	esac

	rebase= done= not_done= trouble= date=
	topic_sha1=`git rev-parse --verify "refs/heads/$topic"`

	date=`
		git rev-list -1 --pretty "$topic" |
		sed -ne 's/^Date: *\(.*\)/ (\1)/p'
	`
	only_next_1=`git rev-list ^master "^$topic" next | sort`
	only_next_2=`git rev-list ^master           next | sort`
	rebase=
	if test "$only_next_1" = "$only_next_2"
	then
		not_in_topic=`git rev-list "^$topic" master`
		if test -z "$not_in_topic"
		then
			:; # already up-to-date.
		else
			rebase=" (can be rebased)"
		fi
	fi
	if test -n "$rebase"
	then
		echo "Rebasing $topic to pick up:"
		git rev-list --pretty=oneline "^$topic" master |
		sed -e 's/^[0-9a-f]* / * /'
		git checkout "$topic" &&
		git rebase master || break;
	fi
done