console.log 到标准输出的 gulp 事件

问题描述

我想在 gulp 任务正在运行或已经运行时登录到标准输出(配置环境).

I want to log to stdout (the config environment) when a gulp task is running or has run.

类似这样的:

gulp.task('scripts', function () {
  var enviroment = argv.env || 'development';
  var config = gulp.src('config/' + enviroment + '.json')
      .pipe(ngConstant({name: 'app.config'}));
  var scripts = gulp.src('js/*');

  return es.merge(config, scripts)
    .pipe(concat('app.js'))
    .pipe(gulp.dest('app/dist'))
    .on('success', function() { 
      console.log('Configured environment: ' + environment);
    });
});

我不确定我应该响应什么事件或在哪里可以找到这些事件的列表.任何指针?非常感谢.

I am not sure what event I should be responding to or where to find a list of these. Any pointers? Many thanks.

推荐答案

(2017 年 12 月，提供日志记录的 gulp-util 模块，已弃用.Gulp 团队建议开发人员将此功能替换为 fancy-log 模块.此答案已更新以反映这一点.)

(In December 2017, the gulp-util module, which provided logging, was deprecated. The Gulp team recommended that developers replace this functionality with the fancy-log module. This answer has been updated to reflect that.)

fancy-log 提供日志记录，最初构建由 Gulp 团队提供.

fancy-log provides logging and was originally built by the Gulp team.

var log = require('fancy-log');
log('Hello world!');

要添加日志记录，Gulp 的 API 文档告诉我们.src 返回:

To add logging, Gulp's API documentation tell us that .src returns:

返回可以通过管道传输到插件的 Vinyl 文件流.

Returns a stream of Vinyl files that can be piped to plugins.

Node.js 的 Stream 文档提供了事件列表.放在一起，这里有一个例子:

Node.js's Stream documentation provides a list of events. Put together, here's an example:

gulp.task('default', function() {
    return gulp.src('main.scss')
        .pipe(sass({ style: 'expanded' }))
        .on('end', function(){ log('Almost there...'); })
        .pipe(minifycss())
        .pipe(gulp.dest('.'))
        .on('end', function(){ log('Done!'); });
});

注意:end 事件可能会在插件完成之前被调用(并且已经发送了它自己的所有输出)，因为当所有数据都已刷新到底层系统"时会调用该事件".

Note: The end event may be called before the plugin is complete (and has sent all of its own output), because the event is called when "all data has been flushed to the underlying system".

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