我的gulp第一个程序

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        <h2>写在前面</h2>
        <p>本来是想写个如何编写gulp插件的科普文的，突然探究欲又发作了，于是就有了这篇东西。。。翻了下源码看了下<code>gulp.src()</code>的实现，不禁由衷感慨：肿么这么复杂。。。</p>
        <h2>进入正题</h2>
        <p>首先我们看下<code>gulpfile</code>里面的内容是长什么样子的，很有express中间件的味道是不是～<br />我们知道<code>.pipe()</code>是典型的流式操作的API。很自然的，我们会想到<code>gulp.src()</code>这个API返回的应该是个Stream对象（也许经过层层封装）。本着一探究竟的目的，花了点时间把gulp的源码大致扫了下，终于找到了答案。</p>
        <p>gulpfile.js</p>
        <h2>提前剧透</h2>
        <p>此处有内容剧透，如有对剧透不适者，请自行跳过本段落。。。</p>
        <blockquote>
            <p>gulp.src() 的确返回了定制化的Stream对象。可以在github上搜索<code>ordered-read-streams</code>这个项目。</p>
            <p>大致关系是：<br />ordered-read-streams --> glob-stream --> vinyl-fs --> gulp.src()</p>
 
 
        </blockquote>
        <h2>探究之路</h2>
        <p>首先，我们看下<code>require('gulp')</code>返回了什么。从gulp的源码来看，返回了<code>Gulp</code>对象，该对象上有<code>src</code>、<code>pipe</code>、<code>dest</code>等方法。很好，找到了我们想要的<code>src</code>方法。接着往下看<br />参考：<a href="https://github.com/gulpjs/gulp/blob/master/index.js#L62" target="_blank">https://github.com/gulpjs/gulp/blob/master/index.js#L62</a></p>
        <p>gulp/index.js</p>
        <pre class="hljs-dark"><code class="hljs js"><span class="hljs-keyword">var inst = <span class="hljs-keyword">new Gulp();
<span class="hljs-built_in">module.exports = inst;
</span></span></span></code></pre>
        <p>从下面的代码可以看到，<code>gulp.src</code>方法，实际上是<code>vfs.src</code>。继续<br />参考：<a href="https://github.com/gulpjs/gulp/blob/master/index.js#L25" target="_blank">https://github.com/gulpjs/gulp/blob/master/index.js#L25</a></p>
        <p>gulp/index.js</p>
        <pre class="hljs-dark"><code class="hljs js"><span class="hljs-keyword">var vfs = <span class="hljs-built_in">require(<span class="hljs-string">'vinyl-fs');
<span class="hljs-comment">// 省略很多行代码
Gulp.prototype.src = vfs.src;
</span></span></span></span></code></pre>
        <p>接下来我们看下<code>vfs.src</code>这个方法。从<code>vinyl-fs/index.js</code>可以看到，<code>vfs.src</code>实际是<code>vinyl-fs/lib/src/index.js</code>。<br />参考：<a href="https://github.com/wearefractal/vinyl-fs/blob/master/index.js" target="_blank">https://github.com/wearefractal/vinyl-fs/blob/master/index.js</a></p>
        <p>vinyl-fs/index.js</p>
        <pre class="hljs-dark"><code class="hljs js"><span class="hljs-pi">'use strict';
 
<span class="hljs-built_in">module.exports = {
  src: <span class="hljs-built_in">require(<span class="hljs-string">'./lib/src'),
  dest: <span class="hljs-built_in">require(<span class="hljs-string">'./lib/dest'),
  watch: <span class="hljs-built_in">require(<span class="hljs-string">'glob-watcher')
};
</span></span></span></span></span></span></span></span></code></pre>
        <p>那么，我们看下<code>vinyl-fs/lib/src/index.js</code>。可以看到，<code>gulp.src()</code>返回的，实际是<code>outputStream</code>这货，而<code>outputStream</code>是<code>gs.create(glob, options).pipe()</code>获得的，差不多接近真相了，还有几步而已。<br />参考：<a href="https://github.com/wearefractal/vinyl-fs/blob/master/lib/src/index.js#L37" target="_blank">https://github.com/wearefractal/vinyl-fs/blob/master/lib/src/index.js#L37</a></p>
      
        <p>参考：<a href="https://github.com/armed/ordered-read-streams/blob/master/index.js" target="_blank">https://github.com/armed/ordered-read-streams/blob/master/index.js</a></p>
        <h2>写在后面</h2>
        <p>兜兜转转一大圈，终于找到了<code>gulp.src()</code>的源头，大致流程如下，算是蛮深的层级。代码细节神马的，有兴趣的同学可以深究一下。</p>
        <blockquote>
            <p>ordered-read-streams --> glob-stream --> vinyl-fs --> gulp.src()</p>
        </blockquote>
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var gulp = require('gulp');
var htmlmin = require('gulp-htmlmin');
 
gulp.task('minify', function() {
  gulp.src('src/*.html')
    .pipe(htmlmin({collapseWhitespace: true}))
    .pipe(gulp.dest('dist'))
});
gulp.task('watch', function () {
  console.log('这是测试这是测试!')
  gulp.watch('src/*.html', ['minify']);
});
gulp.task('default', ['minify', 'watch']);