Reddit.com - Highlight unread modmail.

highlightmodmail.user.js

// ==UserScript==
// @name           reddit.com - Highlight unread modmail
// @namespace      v1
// @include        http://www.reddit.com/message/moderator/*
// @include        http://www.reddit.com/r/*/about/message/inbox/*
// ==/UserScript==

function main()
{
    var ALL=0, UNREAD=1,
        now  = new Date().getTime(),
        last = JSON.parse( localStorage['modmail_last_visited']||'{}' ),
        count = 0,
        user = reddit.logged,
        page = localStorage['modmail_page']||ALL;
    
    // Highlight unread messages
    $('.thing.message .entry').each(function(){
        var thing=$(this),
            subreddit = thing.find('.head a:last').text().slice(3,-1),
            timestamp = new Date( thing.find('.head time').attr('datetime') ).getTime();
        if( timestamp > last[subreddit] ){ thing.addClass('new').css('background-color','#FFFDCC'); count++ };
    });

    // Display numer of unread messages
    $('.menuarea')
        .append('<span><b>'+count+'</b> - new message'+(count==1?'':'s') )
        .find('a').click(function(){ hideOld( this.textContent=='all'?0:1 ); return false });

    // Hide read messages
    function hideOld( bool ){
        console.log('bool:',bool)
        $('.menuarea li').removeClass('selected').eq(bool).addClass('selected');

        if( bool*1 ) $('#siteTable>.message').hide().has('.entry.new').show();
        else $('#siteTable>.message').show();
        
        localStorage['modmail_page'] = bool;
    }
    hideOld( page );

    // Update last read times
    $('.correspondent.reddit').text(function(_,sr,c){last[sr.slice(3)]=now});
    localStorage['modmail_last_visited'] = JSON.stringify( last );
}

// Add script to the main page scope
var script = document.createElement("script");script.textContent = "(" + main.toString() + ")();";document.body.appendChild( script );