Only match command input at the start of the command string

tests/test_get_commands.sh

@@ -5,10 +5,20 @@ setup() {
 }
 
 test_get_command_returns_list_for_substring() {
+	commands="list new"
 	expected="list"
 
 	for arg in l li lis list; do
-		result="$(get_command "$arg")"
+		result="$(get_command "$commands" "$arg")"
 		assert_equals "$expected" "$result"
 	done
 }
+
+test_get_command_does_not_return_match_unless_at_start_of_command_string() {
+	commands="delete"
+	expected=""
+
+	result="$(get_command "$commands" "l")"
+
+	assert_equals "$expected" "$result"
+}

zk

@@ -1,20 +1,24 @@
 #!/bin/sh
 
-COMMANDS='list'
+COMMANDS='list new delete'
 
 get_command() {
-	for c in $COMMANDS; do
-		if echo "$c" | grep "$1" >/dev/null; then
+	commands="$1"
+	input="$2"
+
+	for c in $commands; do
+		if echo "$c" | grep "^$input" >/dev/null; then
 			echo "$c"
 		fi
 	done
 }
 
 main() {
-	echo "Hello, world"
+	subcommand="$(get_commands "$COMMANDS" "$1")"
+	echo "$subcommand"
 }
 
 name="$(basename "$0")"
 if test "$name" = "zk"; then
-	main
+	main "$@"
 fi