#!/bin/bash
###########################################################################
# determines outstanding changesets between branches
###########################################################################
# $1    = name of source branch
# $2    = name of target branch
# $3    = ticket prefix
###########################################################################

rootdir=${0%/*}
allowed_options="-q --no-merge-details"
# by default, provide details for merge commits
mergedetails=1

if [ "$(type -t usage)" != "function" ]
then
	usage()
	{
		echo "Usage: $(basename $0) [-q] <source-branch-name> <target-branch-name> <ticket-prefix>"
		exit 1
	}
fi

. "$rootdir/include/config.inc"
. "$rootdir/include/options.inc"
. "$rootdir/include/display.inc"
. "$rootdir/include/utility.inc"
. "$rootdir/include/cleanup.inc"
. "$rootdir/include/svn.inc"
. "$rootdir/include/repo-info.inc"
. "$rootdir/include/branching.inc"
. "$rootdir/include/ticket.inc"

case $1 in
-*)
	warning "Unknown option: $1"
	usage
	;;
esac

has_option "--no-merge-details" && mergedetails=

if [ $# -ne 3 ]
then
	usage
fi

[ -n "$1" ] || error "Source branch name is missing"
[ -n "$2" ] || error "Target branch name is missing"
[ -n "$3" ] || error "Ticket prefix is missing"

src="$1"
tgt="$2"
prefix="$3"
shift 3

message "Loading repository information" standout
load_repo_info

message "Initializing local branches" standout
init_local_branch "$src"
init_local_branch "$tgt"

tgtmax=$(get_head_rev "$tgt")
[ -n "$tgtmax" ] || error "Computing maximum revision of $tgt failed"

srcrevs=$(get_revs "$src" "$tgt")
tgtmerged=$(get_merged_revs "$tgt" "$src")

revs=
tickets=

message "Determining outstanding changesets" standout
while read rev
do
	msg=$(get_log_message "$src" $rev)
	for t in $(extract_tickets "$msg" "$prefix")
	do
		echo "$tickets" | grep -q "\<$t\>" ||
			tickets+="$t "
	done
	revs+="$rev "
	print_log_messages "$src" $rev $mergedetails
done < <(subtract_list "$srcrevs" "$(expand_list "$tgtmerged")")

tickets="${tickets% }"

if [ -n "$tickets" ]
then
	message "Tickets which are missing:" standout
	for t in $tickets
	do
		message "  $t: " -n
		message "$(get_ticket_title "$t")" yellow
	done
else
	message "No missing changesets found." green
fi