middleware.js

"use strict";
var mime = require("mime"),
    cssmin = require("cssmin");
var mini = {
    js: function(str, resp){
        var resu = require("uglify-js").minify(str,{fromString: true});
        resp.end( resu.code );
    },
    css: function(str, resp){ resp.end( cssmin(str)); },
    htm: function(str, resp){ resp.end( str.replace(/\s+/g," ") ); },
    get: function(pathname){
        var extType = pathname.split('.').pop();
        return function(str, resp){
            var m = mini[extType];
            if(m){
                m(str, resp);
            }else{
                resp.end( str );
            }
        };
    }
};
var middleware = {
	coffee: function(req, resp, rs, pathname, DEBUG){
        var scriptStr = require("coffee-script").compile( rs );
        resp.writeHead(200, {"middleware-type": 'js', "Content-Type": mime.get('js')});   //用以build输出时转换后缀名
        if(DEBUG){
            resp.end( scriptStr );
        }else{
            mini.js(scriptStr, resp);
        }
	},
	less: function(req, resp, rs, pathname, DEBUG){
        require("less").render(rs, {
            paths: [ pathname.replace(/(\/[^\/]+?)$/,"") ],
            compress: !DEBUG
        }, function (err, output) {
            if (err) { throw err }
            else{
                resp.writeHead(200, {"middleware-type": 'css', "Content-Type": mime.get('css')});
                resp.end( output.css );
            }
        });
	},
    jade: function(req, resp, rs){
        resp.writeHead(200,{"middleware-type": 'html', "Content-Type": mime.get('html')});
        var output = require('jade').render(rs);
        resp.end( output );
    },
    md: function(req, resp, rs){
        resp.writeHead(200,{"middleware-type": 'html', "Content-Type": mime.get('html')});
        var output = require( "markdown" ).markdown.toHTML(rs + '');
        resp.end( '<style>code{padding:2px 8px;background:#eee;}</style>' + output );
    }
};
exports.get = function(pathname){
    var extType = pathname.split('.').pop(),
        fn = middleware[extType];
    return !fn ? !1 : function(req, resp){
        try{
            fn.apply(middleware,arguments);
        }catch(e){
            resp.writeHead(500, {"Content-Type": "text/html"});
            resp.end( JSON.stringify(e) );
        }
    };
};
exports.mini = mini;

mime.get = function(path, fallback){
    if( /\bdo$/.test(path) ){
        return this.lookup(path, fallback || "text/html");
    }else if( /\bcur$/.test(path) ){
        return "";
    }else{
        return this.lookup(path, fallback);
    }
};
mime.isTXT = function(path, fallback){
    return  /\b(php|jsp|asp|less|coffee|jade)$/.test(path) || /\b(text|xml|javascript|json)\b/.test( this.get(path, fallback) );
};