Implement the basic logic to resolve name prefixes passed to 'flow feature'...

Implement the basic logic to resolve name prefixes passed to 'flow feature' into their full feature branch names, if unambiguous.

git-flow-feature

@@ -55,7 +55,54 @@ cmd_help() {
 	exit 0
 }
 
+parse_feature_rev() {
+	# first, check if there is a perfect match
+	if echo "$LOCAL_BRANCHES" | grep -q "^$PREFIX/$1\$"; then
+		echo "$PREFIX/$1"
+	fi
+
+	MATCHES="$(echo "$LOCAL_BRANCHES" | grep "^$PREFIX$1")"
+	NUM_MATCHES=$(echo "$MATCHES" | wc -l)
+	if [ $NUM_MATCHES -eq 1 ]; then
+		echo "$MATCHES"
+	elif [ $NUM_MATCHES -eq 0 ]; then
+		# no prefix match, so take it literally
+		echo "$1"
+	else
+		# multiple matches, cannot decide
+		warn "Multiple branches match for prefix '$1':"
+		for match in $MATCHES; do
+			warn "- $match"
+		done
+		die "Aborting. Use an unambiguous prefix."
+	fi
+}
+
+get_name_from_arg() {
+	NAME=$(parse_feature_rev "$1")
+	if [ -z "$NAME" ]; then
+		exit 1
+	fi
+}
+
 parse_args() {
+	# TODO: When we have a nice structured way of parsing flags with getopt,
+	# implement the following flags:
+	# --fetch, to set FLAG_FETCH=1
+	# --no-fetch, to set FLAG_FETCH=0
+	get_name_from_arg "$1"
+	echo $NAME
+	#exit 1 # debug!
+	BASE="${2:-$DEVELOP_BRANCH}"
+	if [ "$NAME" = "" ]; then
+		echo "Missing argument <name>."
+		usage
+		exit 1
+	fi
+	BRANCH=$PREFIX$NAME
+}
+
+parse_start_args() {
 	# TODO: When we have a nice structured way of parsing flags with getopt,
 	# implement the following flags:
 	# --fetch, to set FLAG_FETCH=1
@@ -71,7 +118,7 @@ parse_args() {
 }
 
 cmd_start() {
-	parse_args "$@"
+	parse_start_args "$@"
 
 	# sanity checks
 	gitflow_require_clean_working_tree