Aliases for commands

lib/App.js

@@ -226,6 +226,23 @@ class App {
 			if (validCommandName === validUserInput) {
 				cmd = command;
 				break;
+			} else {
+				// Check whether the command's alias has been entered instead
+				let abort = false;
+				for (let alias in command.aliases) {
+					let aliasName = command.aliases[alias];
+					let validAName = command.caseSensitive ? aliasName : aliasName.toLowerCase();
+
+					if (validUserInput === validAName) {
+						cmd = command;
+						abort = true;
+						break;
+					}
+
+					if (abort) {
+						break;
+					}
+				}
 			}
 		}
 

lib/Command.js

@@ -100,8 +100,11 @@ class Command {
 			(
 				options.async &&
 				typeof options.async !== "boolean"
-			)                                                  // async is not required
-
+			)                                               || // async is not required
+			(
+				options.aliases &&
+				!Array.isArray(options.aliases)                // aliases is not required
+			)
 
 		) {
 			throw new Error("Wrong parameters passed when creating command " + options.name +
@@ -146,6 +149,17 @@ class Command {
 			}
 
 		}
+
+		this.aliases = {};
+		options.aliases = options.aliases || [];
+		for (let i = 0; i < options.aliases.length; i++) {
+
+			if (typeof options.aliases[i] === "string") {
+				this.aliases[i] = options.aliases[i];
+			} else {
+				throw new Error("One of the items in the aliases array is not a string.");
+			}
+		}
 	}
 
 	/**
@@ -158,7 +172,20 @@ class Command {
 	_getHelp(app) {
 		const LINE_WIDTH = 100;
 
-		let r = str.help_usage + " " + app.prefix + " " + this.name;
+		let r = str.help_usage + " " + app.prefix + " " + this.name + "\n";
+
+		// Add aliases
+		if (this.aliases.length > 0) {
+			r += "Aliases for this command: ";
+			for (let i in this.aliases) {
+				r += this.aliases[i];
+				if ((i + 1) < this.aliases.length) {
+					r += ",";
+				}
+			}
+			r += "\n";
+		}
+
 		let args_table;
 
 		// Add every argument to the usage (Only if there are arguments)