allow paassing of an optional filter when parsing

package.json

@@ -1,6 +1,6 @@
 {
   "name": "commandparser",
-  "version": "1.0.17",
+  "version": "1.0.18",
   "description": "Parser meant to parse commands and their options for discord bots",
   "main": "build/index.js",
   "author": "Navy.gif",

src/Parser.ts

@@ -60,7 +60,19 @@ class Parser extends EventEmitter {
         return command || null;
     }
 
-    async parseMessage(message: string, prefix = this.prefix, guild?: unknown): Promise<ParseResult | null> {
+    
+    /**
+     *
+     *
+     * @param {string} message The text to parse command from
+     * @param {string} [prefix=this.prefix] Optional prefix to look for in front of the message
+     * @param {unknown} [guild] The guild to pass to the parser if the command options require values that expect guild based structures, e.g. a guild member.
+     * @param {Function} [commandFilter] Function for filtering out commands, useful if you want to stop the parser on a command level before argument parsin, probably saves some processing time.
+     * @return {Promise<ParseResult | null>}  {(Promise<ParseResult | null>)}
+     * @memberof Parser
+     */
+    // eslint-disable-next-line  @typescript-eslint/ban-types
+    async parseMessage(message: string, prefix = this.prefix, guild?: unknown, commandFilter?: Function): Promise<ParseResult | null> {
 
         if (!message.startsWith(prefix) || !message.length) return null;
         let params: string[] = message.replace(prefix, '').split(' ').filter((str) => str.length);
@@ -69,6 +81,7 @@ class Parser extends EventEmitter {
 
         const command = this.matchCommand(commandName);
         if (!command) return null;
+        if (commandFilter && typeof commandFilter === 'function' && commandFilter(command)) return null;
 
         this.debug(`Matched command ${command.name}`);
         const { subcommands, subcommandGroups } = command;