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disillusion / bash.im color quotes

// ==UserScript==
// @name        bash.im color quotes
// @namespace   bash.im
// @include     http://bash.im/*
// @version     1
// @grant       none
// @require		http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js
// ==/UserScript==


window.addEventListener('load', function() {
	// to conver date with offset UTC
	function convertDate(dateString, offsetDiff){
		var reggie = /(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2})/;
		var dateArray = reggie.exec(dateString); 
		var newDate = new Date(
		    (+dateArray[1]),
		    (+dateArray[2])-1, // Careful, month starts at 0!
		    (+dateArray[3]),
		    (+dateArray[4]) - offsetDiff,
		    (+dateArray[5])
		);
		return newDate;
	}

	quote = []; // global variable
	var todayDate = new Date();

	// offset difference  
    var offset = Math.abs(todayDate.getTimezoneOffset())/60;
	var offsetDiff = 3 - offset;


    $(".quote").each(function(index) {
    	// rating of quote
		var quoteRating = $(this).find(".rating").text();
		// date of quote
		var dateString = $(this).find('.date').text();

		// skip empty quotes
		if(!dateString){
			quote[index] = 0;
			return;
		}

		// get converted date with offset difference
		var quoteDate = convertDate(dateString, offsetDiff);

		// difference between todaydate and quote date 
		var diffMs = (todayDate - quoteDate);
		var difSec = Math.floor(diffMs / 1000); // diff in seconds
		var difMin = Math.floor(difSec / 60); // diff in minutes



		// calculate new rating
		var newRating;
		if(isNumeric(quoteRating)){
			newRating = Math.floor(quoteRating / difSec * 100000);
		} else {
			newRating = 0;
		}

		quote[index] = newRating;


		//---------------------debug---------------------

		var datetext = $(this).find('.date').text();
		$(this).find('.date').text(datetext + ' (' + difSec + ' sec)');
		$(this).find('.date').css("color", "#000");
		//-------------------------------------------------

	});

    // get max rating number
    var maxRating = Math.max.apply(Math, quote);
    
    // convert to 100%
    for (index = 0; index < quote.length; ++index) {
    	quote[index] = Math.floor(quote[index] / maxRating * 100);
	}

	// draw
    $(".quote").each(function(index) {
    	//$(this).find('.date').text(quote[index]);
    	if(quote[index] == 0){
    		$(this).css("background-color", "#C0C0C0");
    	}else if(quote[index] <= 10){
    		$(this).css("background-color", "#B22222");
    	}else if(quote[index] <= 20){
    		$(this).css("background-color", "#FF6633");
    	}else if(quote[index] <= 40){
    		$(this).css("background-color", "#FF9933");
    	}else if(quote[index] <= 60){
    		$(this).css("background-color", "#FFFF66");
    	}else if(quote[index] <= 80){
    		$(this).css("background-color", "#ADFF2F");
    	}else if(quote[index] <= 100){
    		$(this).css("background-color", "#00FF00");
    	}else{
    		$(this).css("background-color", "#C0C0C0");
    	}
    	//--------------------debug---------------------
    	var ratingtext = $(this).find(".rating").text();
		$(this).find(".rating").text(ratingtext + ' (' + quote[index] + '%)');
		$(this).find(".rating").css("width", "auto");
		//--------------------------------------------
    });

}, false);