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var fs = require("fs");
var less = require(`less`);
var path = require(`path`);
 
var baseDir = "xxx";
var cssDir = baseDir+"\css";
var lessDir = baseDir+"\less";
  
fs.watch(lessDir,{},function(event, filename){
    var extension = path.extname(filename);
 
    var basename = path.basename(filename,extension);
     
    if(extension!=".less"){
        return;
    }
 
    console.log("compile file : "+filename+" "+new Date());
     
    var fileContent = fs.readFileSync(lessDir+"\"+filename,{encoding:"utf8"});
 
     
    less.render(fileContent,{
                // compress: true,
                paths: [lessDir] 
                        
                }, function (e, output) {
                    if(e){
                        console.log(e);
                        return;
                    }
                     
                    var output_path = cssDir+"\"+basename+".css"
                    // console.log(output.css);
                    // fs.unlinkSync(output_path);
                     
                    fs.writeFileSync(output_path, output.css)
 
                });
     
});