var app = {
    srcPath:'src/',
    buildPath:'build/',
    distPath:'dist/'
}

/*1.引入gulp*/
var gulp = require('gulp');
var less = require('gulp-less');
var cssmin = require('gulp-cssmin');
var uglify = require('gulp-uglify');
var concat = require('gulp-concat');
var connect = require('gulp-connect');
var imagemin = require('gulp-imagemin');
var open = require('open');


gulp.task('lib',function () {
   gulp.src('bower_components/**/*.js')
       .pipe(gulp.dest(app.buildPath+'lib'))
       .pipe(gulp.dest(app.distPath+'lib'))
       .pipe(connect.reload())
});



/*2.定義任務(wù) 把所有html文件移動另一個位置*/
gulp.task('html',function () {
    /*要操作哪些文件 確定源文件地址*/
    gulp.src(app.srcPath+'**/*.html')  /*src下所有目錄下的所有.html文件*/
        .pipe(gulp.dest(app.buildPath))
        .pipe(gulp.dest(app.distPath))
        .pipe(connect.reload())
});
/*3.執(zhí)行任務(wù) 通過命令行右犹。gulp 任務(wù)名稱*/



/*定義編譯less任務(wù)  下載對應(yīng)的插件 gulp-less
* 把less文件轉(zhuǎn)成css放到build
* */
gulp.task('less',function () {
    gulp.src(app.srcPath+'style/index.less')
        .pipe(less())
        .pipe(gulp.dest(app.buildPath+'css/'))
        /*經(jīng)過壓縮萝挤，放到dist目錄當(dāng)中*/
        .pipe(cssmin())
        .pipe(gulp.dest(app.distPath+'css/'))
        .pipe(connect.reload())
});

/*合并js*/
gulp.task('js',function () {
   gulp.src(app.srcPath+'js/**/*.js')
       .pipe(concat('index.js'))
       .pipe(gulp.dest(app.buildPath+'js/'))
       .pipe(uglify())
       .pipe(gulp.dest(app.distPath+'js'))
       .pipe(connect.reload())
});

/*壓縮圖片*/
gulp.task('image',function () {
     gulp.src(app.srcPath+'images/**/*')
         .pipe(gulp.dest(app.buildPath+'images'))
         .pipe(imagemin())
         .pipe(gulp.dest(app.distPath+'images'))
         .pipe(connect.reload())
});

/*同時執(zhí)行多個任務(wù)*/
gulp.task('build',['less','html','js','image','lib']);

gulp.task('server',['build'],function () {
    /*設(shè)置服務(wù)器*/
    connect.server({
        root:[app.buildPath],
        livereload:true,
        port:9999
    })
    /*監(jiān)聽哪些文件*/
    gulp.watch('bower_components/**/*',['lib']);
    gulp.watch(app.srcPath+'**/*.html',['html']);
    gulp.watch(app.srcPath+'js/**/*.js',['js']);
    gulp.watch(app.srcPath+'images/**/*',['image']);
    gulp.watch(app.srcPath+'style/**/*.less',['less']);

    open('http://localhost:9999');
});

/*定義默認(rèn)任務(wù)*/
gulp.task('default',['server']);