Help command

Author: Fatme Havaluova

lib/command-executor.ts

@@ -19,12 +19,12 @@ export class CommandExecutor implements ICommandExecutor {
 
 	private executeCore(commandName: string, commandArguments: string[]): IFuture<void> {
 		return (() => {
-			var command: ICommand = new (require("./commands/" + commandName).Command)();
-			if(!command) {
-				errors.fail("Unable to resolve commandName %s", commandName);
-			}
-
 			try {
+				var command: ICommand = new (require("./commands/" + commandName).Command)();
+				if(!command) {
+					errors.fail("Unable to resolve commandName %s", commandName);
+				}
+
 				command.execute(commandArguments).wait();
 			} catch(e) {
 				if(options.debug) {

lib/commands/help.ts

@@ -0,0 +1,31 @@
+///<reference path=".././.d.ts"/>
+"use strict";
+
+import fs = require("fs");
+import path = require("path");
+import util = require("util");
+
+export class Command implements ICommand {
+	public execute(args: string[]): IFuture<void> {
+		return (() => {
+			var topic = (args[0] || "").toLowerCase();
+			if (topic === "help") {
+				topic = "";
+			}
+
+			var helpContent = fs.readFileSync(path.join(__dirname, "../../resources/help.txt")).toString();
+
+			var pattern = util.format("--\\[%s\\]--((.|[\\r\\n])+?)--\\[/\\]--", this.escape(topic));
+			var regex = new RegExp(pattern);
+			var match = regex.exec(helpContent);
+			if (match) {
+				var helpText = match[1].trim();
+				console.log(helpText);
+			}
+		}).future<void>()();
+	}
+
+	private escape(s: string): string {
+		return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
+	}
+}

lib/options.ts

@@ -10,7 +10,8 @@ var knownOptions: any = {
 	"stdout": String,
 	"stderr": String,
 	"env": String,
-	"args": String
+	"args": String,
+	"help": Boolean
 };
 
 var parsed = {};

resources/help.txt

@@ -0,0 +1,56 @@
+--[]--
+
+Usage:
+    $ ios-sim-portable <command> [command parameters] [--command <options>]
+
+General commands:
+    help <command>       Shows additional information about the commands in this list.
+    launch <App path>    Launch the application at the specified path on the iOS Simulator.
+    device-types         Lists the available device types for current Xcode version.
+    sdks                 Lists the available iOS sdk versions.
+
+General options:
+    --help               Prints help about the selected command.
+
+--[/]--
+
+--[help]--
+
+Usage:
+    $ ios-sim-portable help [<Command>]
+
+Lists the available commands or shows information about the selected command.
+<Command> is any of the available commands as listed by $ ios-sim-portable help.
+
+--[/]--
+
+--[launch]--
+
+Usage:
+    $ ios-sim-portable launch <App path> [--exit]
+
+Launch the application at the specified path on iOS Simulator.
+<App path> - Specifies the path to application(.app file) that you want to run in iOS Simulator.
+
+Options:
+    --exit - If this option is specified, the process is exited after the iOS Simulator is started.
+
+--[/]--
+
+--[device-types]--
+
+Usage:
+    $ ios-sim-portable device-types
+
+Lists the available device types for current XCode version
+
+--[/]--
+
+--[sdks]--
+
+Usage:
+    $ ios-sim-portable sdks
+
+Lists the available iOS sdk versions.
+
+--[/]--