Add --only-free and --help options to test scripts (#1161)

test/fetch-test-deps.sh

@@ -1,10 +1,45 @@
 #!/usr/bin/env bash
-
 set -e
 
 cd "$(dirname "$0")"
 
-case "$1" in
+usage() {
+	echo "Downloads source code of Game Boy programs used as RGBDS test cases."
+	echo "Options:"
+	echo "    -h, --help      show this help message"
+	echo "    --only-free     download only freely licensed codebases"
+	echo "    --get-hash      print programs' commit hashes instead of downloading them"
+	echo "    --get-paths     print programs' GitHub paths instead of downloading them"
+}
+
+# Parse options in pure Bash because macOS `getopt` is stuck
+# in what util-linux `getopt` calls `GETOPT_COMPATIBLE` mode
+nonfree=true
+actionname=
+while [[ $# -gt 0 ]]; do
+	case "$1" in
+		-h|--help)
+			usage
+			exit 0
+			;;
+		--only-free)
+			nonfree=false
+			;;
+		--get-hash|--get-paths)
+			actionname="$1"
+			;;
+		--)
+			break
+			;;
+		*)
+			echo "$(basename $0): unknown option "$1""
+			exit 1
+			;;
+	esac
+	shift
+done
+
+case "$actionname" in
 	--get-hash)
 		action() { # owner/repo shallow-since commit
 			printf "%s@%s-" "${1##*/}" "$3"
@@ -33,6 +68,8 @@ case "$1" in
 		}
 esac
 
-action pret/pokecrystal 2022-09-29 70a3ec1accb6de1c1c273470af0ddfa2edc1b0a9
-action pret/pokered     2022-09-29 2b52ceb718b55dce038db24d177715ae4281d065
-action AntonioND/ucity  2022-04-20 d8878233da7a6569f09f87b144cb5bf140146a0f
+if "$nonfree"; then
+	action pret/pokecrystal 2022-09-29 70a3ec1accb6de1c1c273470af0ddfa2edc1b0a9
+	action pret/pokered     2022-09-29 2b52ceb718b55dce038db24d177715ae4281d065
+fi
+action         AntonioND/ucity  2022-04-20 d8878233da7a6569f09f87b144cb5bf140146a0f