add mc forge

mcjar

@@ -1,5 +1,4 @@
 #!/bin/sh
-
 set -e
 
 lower() {
@@ -21,6 +20,9 @@ PAPERMC_BUILD="$(lower "${PAPERMC_BUILD:-latest}")"
 FABRIC_LOADER="$(lower "${FABRIC_LOADER:-latest}")"
 FABRIC_INSTALLER="$(lower "${FABRIC_INSTALLER:-latest}")"
 
+# forge
+FORGE_VERSION="$(lower "${FORGE_VERSION:-recommended}")"
+
 # other
 QUIET=1
 
@@ -28,7 +30,7 @@ req() {
 	res=$(curl --fail --silent "$1")
 	code=$?
 
-	if [ $code -ne 0 ]; then
+	if [ $code -ne 0 ] || [ "$res" = "" ]; then
 		echo "null";
 	else
 		echo "$res";
@@ -184,8 +186,71 @@ vanilla() {
 	get_version
 }
 
-get_url() {
+forge() {
+	versions=$(req "https://files.minecraftforge.net/net/minecraftforge/forge/promotions_slim.json" | jq -r '.promos');
 
+	log "Using forge promotions slim json"
+
+	get_forge_url() {
+		url="https://maven.minecraftforge.net/net/minecraftforge/forge/$1/forge-$1-installer.jar"
+		code=0
+		wget -q --spider "$url" || code=$?
+		if [ $code -eq 0 ]; then
+			echo "$url";
+		fi
+	}
+
+	get_version() {
+		log "Getting VERSION for '$MC_TYPE'"
+		if [ "$MC_VERSION" = "latest" ]; then
+			MC_VERSION=$(echo "$versions" | jq -r '. | keys | .[]' | awk -F '-' '{print $1}' | sort -t "." -n -k1,1 -k2,2 -k3,3 | tail -n1)
+		fi
+		log "VERSION: $MC_VERSION"
+	}
+
+	try_forge_version() {
+		ver=$(echo "$versions" | jq -r ".\"$MC_VERSION-$FORGE_VERSION\"")
+		if [ "$ver" = "null" ] && [ "$FORGE_VERSION" != "latest" ]; then
+			FORGE_VERSION=latest
+			try_forge_version
+		else
+			echo "$ver"
+		fi
+	}
+
+	get_forge_version() {
+		log "Getting FORGE VERSION for '$MC_TYPE'"
+		if [ "$FORGE_VERSION" != "latest" ] && [ "$FORGE_VERSION" != "recommended" ]; then
+			return;
+		fi
+		ver=$(try_forge_version)
+		if [ "$ver" = "null" ]; then
+			error "Invalid VERSION: $MC_VERSION-$FORGE_VERSION"
+		fi
+		FORGE_VERSION="$ver"
+		log "FORGE VERSION: $FORGE_VERSION"
+	}
+
+	search_for_url() {
+		log "Searching for forge URL"
+		log "Trying MC_VERSION-FORGE_VERSION"
+		ver=$(get_forge_url "$MC_VERSION-$FORGE_VERSION")
+		if [ "$ver" != "" ]; then echo "$ver"; return 0; fi
+		log "Trying MC_VERSION-FORGE_VERSION-MC_VERSION"
+		ver=$(get_forge_url "$MC_VERSION-$FORGE_VERSION-$MC_VERSION")
+		if [ "$ver" != "" ]; then echo "$ver"; return 0; fi
+		log "Trying MC_VERSION-FORGE_VERSION-mc172"
+		ver=$(get_forge_url "$MC_VERSION-$FORGE_VERSION-mc172")
+		if [ "$ver" != "" ]; then echo "$ver"; return 0; fi
+		error "Invalid VERSION: $MC_VERSION-$FORGE_VERSION"
+	}
+
+	get_version
+	get_forge_version
+	search_for_url
+}
+
+get_url() {
 	log "TYPE: $MC_TYPE"
 
 	case "$MC_TYPE" in
@@ -198,6 +263,9 @@ get_url() {
 		"fabric")
 			fabric
 			;;
+		"forge")
+			forge
+			;;
 		*)
 			error "Invalid TYPE: $MC_TYPE"
 			;;
@@ -215,7 +283,7 @@ help() {
 	printf "\t-l\tshow logging (verbose)\n\n"
 
 	printf "\t-t TYPE\t\tset the mc server type\n"
-	printf "\t  [vanilla,fabric,paper,folia,velocity,waterfall]\n\n"
+	printf "\t  [vanilla,fabric,forge,paper,folia,velocity,waterfall]\n\n"
 	printf "\t-v VERSION\tset the mc server version\n"
 	printf "\t  [latest,snapshot,<version>]\n\n"
 
@@ -247,7 +315,6 @@ while getopts "hlt:v:" arg > /dev/null; do
 			;;
 		?)
 			error "unknown option"
-			exit 1
 			;;
 	esac;
 done;