A LineReader, because this kind of stuff should just exist already. ;P

lib/wrench.js

@@ -187,3 +187,40 @@ exports.copyDirRecursive = function copyDirRecursive(srcDir, newDir, clbk) {
         });
     });
 };
+
+exports.LineReader = function(filename, bufferSize) {
+	this.bufferSize = bufferSize || 8192;
+	this.buffer = "";
+	this.fd = fs.openSync(filename, "r");
+	this.currentPosition = 0;
+}
+
+exports.LineReader.prototype = {
+	getBufferAndSetCurrentPosition: function(position) {
+		var res = fs.readSync(this.fd, this.bufferSize, position, "ascii");
+
+		this.buffer += res[0];
+		if(res[1] === 0) return -1;
+
+		this.currentPosition = position + res[1];
+		return this.currentPosition;
+	},
+
+	hasNextLine: function() {
+		while(this.buffer.indexOf('\n') === -1) {
+			this.getBufferAndSetCurrentPosition(this.currentPosition);        
+			if(this.currentPosition === -1) return false;
+		}
+
+		if(this.buffer.indexOf("\n") > -1) return true;
+		return false;
+	},
+
+	getNextLine: function() {
+		var lineEnd = this.buffer.indexOf("\n"),
+			result = this.buffer.substring(0, lineEnd);
+
+		this.buffer = this.buffer.substring(result.length + 1, this.buffer.length);
+		return result;
+	}
+};