Node fiddling: event wrapper around STDIN reading

node_fiddle_stdin.js

var events = require("events");
var util = require("util");

Writer = function(prefix)
{
	if(typeof prefix === "undefined")
	{
		this.prefix = "";
	}
	else
	{
		this.prefix = prefix + ": ";
	}

	this.write = function(chunk)
	{
		process.stdout.write(prefix + chunk);
	}

	this.end = function()
	{
		console.log("KTHXBAI!");
		process.exit(0);
	}
}
	
Reader = function(end)
{
	if(typeof end === "undefined")
	{
		this.end = "\n";
	}
	else if (end !== "\n")
	{
		this.end = end + "\n";
	}
	else
	{
		this.end = end;
	}
	
	this.process = function(chunk)
	{
		chunk = chunk.toString();
		if(chunk === this.end)
		{
			this.emit("end");
		}
		else
		{
			this.emit("write",chunk);
		}
	}
}

util.inherits(Reader,events.EventEmitter);


process.stdin.resume();
process.stdin.setEncoding('utf8');

	
var reader = new Reader("q");
var writer = new Writer("I got: ");

reader.on("write",writer.write);
reader.on("end",writer.end);

console.log("Input, please:");
process.stdin.on('data',function(chunk){reader.process(chunk);});