fsk-imgoptimize/bin/imgoptimize.js

图片优化工具

#!/usr/bin/env node
var fs = require('fs');
var path = require('path');
var ArgumentParser = require('fsk-argparse');
var readdir = require('fsk-traversedir');
var PNG = require('pngjs').PNG;
var GIFStream = require('../lib/gifstream.js');
var argsparser = new ArgumentParser();
argsparser.add('-d', {
  dest: 'cdp',
  desc: '要遍历的目录'
});
argsparser.add('-t', {
  dest: 'target',
  desc: '目标目录'
});
argsparser.add('-f', {
  dest: 'filter',
  desc: '要优化的文件格式, 可以有多个-f参数'
});
argsparser.add('-l', {
  dest: 'level',
  desc: '优化等级'
});
var args = argsparser.parse();
var cdp = args.cdp && args.cdp !== true ? args.cdp : process.cwd();
var target = typeof args.target === 'string' ? args.target : null;
if (target && !fs.statSync(target).isDirectory()) {
  throw new Error('no found directory:' + target);
} else {
  target = path.join(cdp, '../dest');
}
if (fs.statSync(cdp).isDirectory()) {
  mkdirs(target, function() {
    readdir(cdp, {
      filters: ['gif', 'png'],
      callback: function(list) {
        var gifList = list.gif || [];
        var pngList = list.png || [];
        gifList.forEach(function(gif) {
          var relaPath = path.relative(cdp, gif);
          var targetPath = path.join(target, relaPath);
          console.log(targetPath);
          mkdirs(path.dirname(targetPath), function() {
            var dst = fs.createWriteStream(targetPath);
            fs.createReadStream(gif).pipe(new GIFStream()).pipe(dst);
          });
        });
        pngList.forEach(function(png) {
          var relaPath = path.relative(cdp, png);
          var targetPath = path.join(target, relaPath);
          console.log(targetPath);
          var newPng = new PNG();
          mkdirs(path.dirname(targetPath), function() {
            var dst = fs.createWriteStream(targetPath);
            newPng.on('parsed', function() {
              newPng.pack().pipe(dst);
            });
            fs.createReadStream(png).pipe(newPng);
          });
        });
      }
    });
  })
} else {
  throw new Error('invalid dir:' + cdp);
}

function mkdirs(dirpath, callback) {
  fs.stat(dirpath, function(err, stat) {
    if (stat) {
      callback();
    } else {
      var parent = path.dirname(dirpath);
      fs.mkdir(dirpath, function(err) {
        if (err) {
          mkdirs(parent, function(){
            mkdirs(dirpath,callback);
          });
        } else {
          callback();
        }
      });
    }
  });
}