问题描述

通常在 Gulp 中的任务是这样的:

Normally in Gulp tasks look like this:

gulp.task('my-task', function() {
    return gulp.src(options.SCSS_SOURCE)
        .pipe(sass({style:'nested'}))
        .pipe(autoprefixer('last 10 version'))
        .pipe(concat('style.css'))
        .pipe(gulp.dest(options.SCSS_DEST));
});

是否可以将命令行标志传递给 gulp(这不是任务)并让它有条件地运行任务?比如

Is it possible to pass a command line flag to gulp (that's not a task) and have it run tasks conditionally based on that? For instance

$ gulp my-task -a 1

然后在我的 gulpfile.js 中:

And then in my gulpfile.js:

gulp.task('my-task', function() {
        if (a == 1) {
            var source = options.SCSS_SOURCE;
        } else {
            var source = options.OTHER_SOURCE;
        }
        return gulp.src(source)
            .pipe(sass({style:'nested'}))
            .pipe(autoprefixer('last 10 version'))
            .pipe(concat('style.css'))
            .pipe(gulp.dest(options.SCSS_DEST));
});

推荐答案

Gulp 没有为此提供任何类型的实用程序，但您可以使用许多命令 args 解析器之一.我喜欢 yargs.应该是:

Gulp doesn't offer any kind of util for that, but you can use one of the many command args parsers. I like yargs. Should be:

var argv = require('yargs').argv;

gulp.task('my-task', function() {
    return gulp.src(argv.a == 1 ? options.SCSS_SOURCE : options.OTHER_SOURCE)
        .pipe(sass({style:'nested'}))
        .pipe(autoprefixer('last 10 version'))
        .pipe(concat('style.css'))
        .pipe(gulp.dest(options.SCSS_DEST));
});

您也可以将它与 gulp-if 结合起来，以有条件地管道流，对于开发与产品构建非常有用:

You can also combine it with gulp-if to conditionally pipe the stream, very useful for dev vs. prod building:

var argv = require('yargs').argv,
    gulpif = require('gulp-if'),
    rename = require('gulp-rename'),
    uglify = require('gulp-uglify');

gulp.task('my-js-task', function() {
  gulp.src('src/**/*.js')
    .pipe(concat('out.js'))
    .pipe(gulpif(argv.production, uglify()))
    .pipe(gulpif(argv.production, rename({suffix: '.min'})))
    .pipe(gulp.dest('dist/'));
});

并使用 gulp my-js-task 或 gulp my-js-task --production 调用.

And call with gulp my-js-task or gulp my-js-task --production.

这篇关于是否可以将标志传递给 Gulp 以使其以不同的方式运行任务?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！