Using gulp to execute different tasks

gulpfile.js

// gulpfile.js
let path = require('path')
let gulp = require('gulp')
let cleanCSS = require('gulp-clean-css')
let cssWrap = require('gulp-css-wrap')
let replace = require('gulp-replace');
let cn = require('./i18n/src/cn');

gulp.task('css-wrap', function () {
  return gulp.src(path.resolve('./theme/default/index.css'))
  /* 找需要添加命名空间的css文件，支持正则表达式 */
  .pipe(cssWrap({
    selector: '.theme-default' /* 添加的命名空间 */
  }))
  .pipe(cleanCSS())
  .pipe(gulp.dest('src/assets/css/theme/default')) /* 存放的目录 */
})

// custom match
gulp.task('i18n', function(){
    gulp.src(path.resolve('./src/layout/sysadminLayout.js'))
    .pipe(replace(/'[\u4e00-\u9fa5]+/g, function(match) {
        let template;
        for (let key in cn) {
            let value = cn[key]
            if(value == match) { template = key }
        }
        if (template) {
            let str = `i18n.t('${template}')`
            console.log(`i18n: ${template}`)
            return str
        } else {
            return match
        }
    }))
    .pipe(gulp.dest('i18n/dest'));
});

// l for layout match
gulp.task('i18n-l', function(){
    gulp.src(path.resolve('./src/components/base/service-log.vue'))
    .pipe(replace(/["][\u4e00-\u9fa5]+["]/g, function(match) {
        let template;
        let tmp = match.split('"').join('');
        for (let key in cn) {
            let value = cn[key]
            if(value == tmp) { template = key }
        }
        if (template) {
            let str = `"$t('${template}')"`
            console.log(`"$t('${template}')"`)
            return str
        } else {
            return match
        }
    }))
    .pipe(gulp.dest('i18n/dest/components/base'));
});

// t for template match
gulp.task('i18n-t', function(){
    gulp.src(path.resolve('./src/components/base/service-log.vue'))
    .pipe(replace(/[>][\u4e00-\u9fa5]+[<]/g, function(match) {
        let template;
        let tmp = match.split('>').pop().split('<')[0];
        for (let key in cn) {
            let value = cn[key]
            if(value == tmp) { template = key }
        }
        if (template) {
            // let str = `i18n.t('${template}')`
            let str = `>{{ $t('${template}') }}<`
            console.log(`i18n: ${template}`)
            return str
        } else {
            return match
        }
    }))
    .pipe(gulp.dest('i18n/dest/components/base'));
});

// g for globally match
gulp.task('i18n-g', function(){
    gulp.src(path.resolve('./src/base/sockjsMsg.js'))
    .pipe(replace(/[\u4e00-\u9fa5]+/g, function(match) {
        console.log(`Matched: ${match}`)
        for (let key in cn) {
            let value = cn[key]
            if(value == match) {
                console.log(`Existed: ${value}`)
                break;
            }
        }
        console.log('\n')
    }))
});