gulp some tips

gulp作为替代grunt的task runner后起之秀，基于nodejs的stream操作模型，大大减少了对磁盘的操作因此大大提高了性能。

gulp error handling

var gulp = require('gulp');var coffee = require('gulp-coffee');var concat = require('gulp-concat');function handleError(error){  console.log(error);  this.emit('end');    }gulp.task('coffee',function(){    return gulp.src('src/*.coffee')                     .pipe(coffee())                     .on('error',handleError)                     .pipe(concat('all.js').pipe(gulp.dest('dist/'));});                           gulp.task('watch', ['coffee'], function(){           gulp.watch('src/*.coffee',['coffee']);});

 对于gulp.src这类的对glob文件系统的操作，如果文件或者文件夹不存在，后续的gulp stream操作默认也不会有任何错误抛出，有时很让人困惑。

其中的解决方案就是使用gulp-expect-file

var coffee = require('gulp-coffee');var expect = require('gulp-expect-file');gulp.task('mytask', function() {  var files = ['idontexist.html'];  return gulp.src(files)    .pipe(expect(files))    .pipe(coffee());});

http://stackoverflow.com/questions/22343591/gulp-silently-failing-no-errors-printed-to-console

 

下面通过重载gulp.src的方法实现默认将plumber放到gulp stream errorhandlering中

var gulp = require('gulp');var plumber = require('gulp-plumber');var gutil = require('gulp-util'); var gulp_src = gulp.src;gulp.src = function() {  return gulp_src.apply(gulp, arguments)    .pipe(plumber(function(error) {      // Output an error message      gutil.log(gutil.colors.red('Error (' + error.plugin + '): ' + error.message));      // emit the end event, to properly end the task      this.emit('end');    })  );};

https://www.timroes.de/2015/01/06/proper-error-handling-in-gulp-js/