avg-cli/dist/mods/convertImage.js

CLI tools for AVG.js

'use strict';

function _asyncToGenerator(fn) { return function () { var gen = fn.apply(this, arguments); return new Promise(function (resolve, reject) { function step(key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { return Promise.resolve(value).then(function (value) { step("next", value); }, function (err) { step("throw", err); }); } } return step("next"); }); }; }

const path = require('path');
const execFile = require('child_process').execFile;
const cwebp = require('cwebp-bin');
const fs = require('fs-extra');
const ora = require('ora');
const getFileListByExtension = require('../utils/getFileListByExtension.js');

function execFilePromise(exec, params) {
  return new Promise((resolve, reject) => {
    execFile(exec, params, function (err) {
      if (err) {
        reject(err);
      } else {
        resolve();
      }
    });
  });
}

function changeExtension(filename, ext) {
  const basename = filename.substr(0, filename.lastIndexOf('.'));
  return `${ basename }.${ ext }`;
}

/**
 * Convert all images in ./assets to webp format,
 * and output to ./dist/assets
 * 
 * @param {string} dir project path
 */
module.exports = (() => {
  var _ref = _asyncToGenerator(function* (dir, options, onProgress) {

    let spinner = ora('正在优化图片...').start();

    options = Object.assign({
      lossless: false,
      quality: 90,
      sourceExtensions: ['png', 'jpg', 'jpeg', 'bmp'],
      // 目标扩展名设置目前是无效的，强制为webp+png
      targetExtension: 'webp'
    }, options);

    let compressOptions;

    if (options.lossless) {
      compressOptions = ['-lossless', '-z', '6'];
    } else {
      compressOptions = ['-af', '-q', options.quality];
    }

    const fileList = yield getFileListByExtension(path.resolve(dir, 'assets'), [...options.sourceExtensions, ...options.targetExtension]);

    for (const file of fileList) {
      const originFilename = path.resolve(dir, 'assets', file);
      const targetFilename = path.resolve(dir, 'dist/assets', file);
      const webpFilename = changeExtension(path.resolve(dir, 'dist/assets', file), 'webp');

      spinner.text = `正在优化图片...${ file }`;

      fs.ensureDirSync(path.dirname(webpFilename));

      // 判断是否为 .webp 格式，若为是，直接拷贝，否则进行格式转换
      if (path.extname(file) === `.${ options.targetExtension }`) {
        fs.copySync(originFilename, webpFilename);
      } else {
        fs.copySync(originFilename, targetFilename);
        yield execFilePromise(cwebp, [...compressOptions, originFilename, '-o', webpFilename]);
      }
    }

    spinner.succeed('优化图片');
  });

  return function (_x, _x2, _x3) {
    return _ref.apply(this, arguments);
  };
})();