是否可以在一个任务中调用两个bower.commands函数？

Question

我最近开始学习如何使用GruntJS和Bower。我的任务是使用bower的编程api和一个繁重的任务。我试图完成的是调用bower.commands.info，将所需项目的bower.json中的文件路径与我希望它进入的本地文件路径进行比较。然后它应该将该项目安装到本地路径中。到目前为止，它只调用bower.commands.info，但忘记了bower.commands.install。我甚至改变了他们被召唤来看是否会有任何影响的顺序。它只显示信息，但没有安装。希望我的代码能解释更多：

module.exports = function(grunt){

    grunt.initConfig({
        //this is where the grunt tasks go

        //this is where the package info is read in
        pkg: grunt.file.readJSON('package.json'), //use comma if adding npm tasks

        'bower-install': {
            target: {
                //point to the html file that is to be updated
                html: 'index.html',

                //Optional:
                //ignorePath: 'wxProj/',

                //customize how stylesheets are included
                cssPattern: '<link rel="stylesheet" href="{{filePath}}"/>',

                //customize how scripts are included
                jsPattern: '<script type="text/javascript" src="{{filePath}}"> </script>'
            }
        }
    });

    //feel free to load any npm tasks here
    grunt.loadNpmTasks('grunt-bower-install');

    //this function uses bower to pull some files from my github
    grunt.registerTask('extract', function(name){
        var bower = require('bower'),
            bower_done = this.async(),
            wxdesk_contents = '{\n' +
                '"directory" : "wxdesk/bower_components"\n' +
            '}',
            vendor_contents = '{\n' +
            '"directory" : "vendor/bower_components"\n'+
            '}';

        bower.commands.info(name, 'dest')
        .on('error', function(){
            bower_done(false);
        })
        .on('end', function(dest){
            bower_done();
            grunt.log.writeln(dest);
            if(dest == 'wxdesk'){
                grunt.log.writeln('written to wxdesk!');
                //change .bowerrc's "directory" property
                grunt.file.write('.bowerrc', wxdesk_contents);
            }
            else
            {
                grunt.log.writeln('written to vendor!');
                grunt.file.write('.bowerrc', vendor_contents);
            }
        });

        bower.commands.install([name], {save: true})
        .on('log', function(result){
            grunt.log.writeln(['bower', result.id.cyan, result.message].join(' '));
        })
        .on('error', function(){
            bower_done(false);
        })
        .on('end', function(results){
            bower_done();
            //run grunt bower-install
            grunt.task.run('bower-install');
        });
    });
}

Answer 1

所以，除了睡眠不足之外，我还发现了问题所在。我调用了bower_done()；在bower.commands.info中，当它只在安装中完成任务线程时。换言之：

bower.commands.info(name, 'dest')
        .on('error', function(){
            bower_done(false);
        })
        .on('end', function(dest){
            ////////////////////////////////////////////////
            //bower_done(); <= This guy should not be here!
            ////////////////////////////////////////////////
            grunt.log.writeln(dest);
            if(dest == 'wxdesk'){
                grunt.log.writeln('written to wxdesk!');
                //change .bowerrc's "directory" property
                grunt.file.write('.bowerrc', wxdesk_contents);
            }
            else
            {
                grunt.log.writeln('written to vendor!');
                grunt.file.write('.bowerrc', vendor_contents);
            }
        });

        bower.commands.install([name], {save: true})
        .on('log', function(result){
            grunt.log.writeln(['bower', result.id.cyan, result.message].join(' '));
        })
        .on('error', function(){
            bower_done(false);
        })
        .on('end', function(results){
            ///////////////////////////////
            bower_done(); //<= should be here on the final task to end the async
            ///////////////////////////////
            //run grunt bower-install
            grunt.task.run('bower-install');
        });