Merge pull request #5 from jackwilsdon/add-message-format

merged PR to fix issue #4

README.md

@@ -25,6 +25,12 @@ log.info( 'hello world!' );
 log.warn( 'carefule there, world!' );
 
 log.error( 'WHOA WHOA WHOA world?!' );
+
+log.config({
+	messageFormatting: true
+});
+
+log.info("I see %d %s!", 3, "bananas");
 ```
 
 The above code will render to: 
@@ -164,3 +170,21 @@ For examples, the longest string of the above events is `warning`, with 7 charac
 	error.length = 5    ===>  7 - 5 = 2  ===> "  "
 
 If this confuses you, don't worry much about it, you don't have to use it. I simply included it to make outputing to the console prettier.
+
+### Message Formatting
+
+Message Formatting
+
+Messages can be formatted using util.format by setting the config option messageFormatting to true. This defaults to false to ensure backward compatibility with versions prior to 0.3.1.
+
+For example:
+
+```javascript
+log.info("I see", "3", "bananas!") // Outputs "I see 3 bananas!"
+
+log.config({
+	messageFormatting: true
+});
+
+log.info("I see %d %s!", 3, "bananas"); // Outputs "I see 3 bananas!"
+```

example.js

@@ -3,7 +3,15 @@ var log = require('./logger').config({ level: 0 });
 log.debug('hello?');
 
 log.info('hello world!');
-	
+
 log.warn('careful there, world');
-	
+
 log.error('WHOA WHOA WHOA world!');
+
+log.info("I see", "3", "bananas!") // Outputs "I see 3 bananas!"
+
+log.config({
+	messageFormatting: true
+});
+
+log.info("I see %d %s!", 3, "bananas"); // Outputs "I see 3 bananas!"

logger.js

@@ -1,12 +1,14 @@
 var dateFormat = require('dateformat'),
-	colors = require('colors');
+	colors = require('colors'),
+	util = require('util');
 
 var events = { };
 
 var options = {
 	level: 0,
 	format: "%timestamp% - %event%:%padding%  %message%",
-	timestamp: "HH:MM:ss"
+	timestamp: "HH:MM:ss",
+	messageFormatting: false
 };
 
 function log_event( options ) {
@@ -36,8 +38,12 @@ log_event.prototype.__defineGetter__ ('padding', function() {
 log_event.prototype.output = function(input) {
 	if(options.level <= this.level ) {
 		var message = '';
-		for(var i in input) {
-			message += " " + ( typeof input[i] === "object" ? JSON.stringify( input[i], null ) : input[i] );
+		if (options.messageFormatting) {
+			message = " " + util.format.apply(util, input);
+		} else {
+			for(var i in input) {
+				message += " " + ( typeof input[i] === "object" ? JSON.stringify( input[i], null ) : input[i] );
+			}
 		}
 		var format = this.format || options.format;
 		var output = format

package.json

@@ -1,7 +1,7 @@
 {
 	"name": "custom-logger",
 	"description": "Simple yet highly customizable console logger for node.js. Supports templating output, custom log levels, custom log types, and colored output.",
-	"version": "0.3.0",
+	"version": "0.3.1",
 	"author": "Felix Milea-Ciobanu <[email protected]> (http://felixmc.com/)",
 	"repository": {
 		"type": "git",