lzma-native/bin/lzmajs

#!/usr/bin/env node
'use strict';

var program = require('commander');
var lzma = require('../');
var fs = require('fs');
var path = require('path');

var argv = process.argv.slice(2);
var positionalArgs = [];

var level = undefined;
var threads = undefined;
var compress = true;

for (var i = 0; i < argv.length; ++i) {
  if (argv[i][0] !== '-') {
    positionalArgs.push(argv[i]);
    continue;
  }

  if (!isNaN(+argv[i][1])) {
    level = +argv[i][1];
    continue;
  }

  switch (argv[i]) {
    case '-d':
    case '--decompress':
      compress = false;
      break;
    case '-z':
    case '--compress':
      compress = true;
      break;
    case '-t':
    case '--threads':
      if (!isNaN(+argv[i+1]))
        threads = +argv[++i];
      else
        threads = 0;
      break;
    default:
    case '-h':
    case '--help':
      usage();
      return;
  }
}

function usage() {
  process.stdout.write('Usage: \n' +
      '  ' + path.basename(process.argv[1]) +
        ' [-d|-z] [-t num] [-1|...|-9] [infile] [outfile]\n' +
      '\n' +
      '  -d, --decompress      Decompress infile to outfile\n' +
      '  -z, --compress        Compress infile to outfile\n' +
      '  -t n, --threads n     Use n threads for compressing\n' +
      '  -1, ..., -9           Specifiy compression level\n' +
      '  -h, --help            Display this text\n' +
      '\n' +
      '  <infile> defaults to stdin and <outfile> defaults to stdout.\n');
  return;
}

var input = process.stdin, output = process.stdout;

if (positionalArgs.length > 0) {
  input = fs.createReadStream(positionalArgs.shift());
}

if (positionalArgs.length > 0) {
  output = fs.createWriteStream(positionalArgs.shift());
}

var opts = {
  preset: level || lzma.PRESET_DEFAULT,
  threads: threads,
};

var encoder = lzma.createStream(compress ? 'easyEncoder' : 'autoDecoder', opts);

input.pipe(encoder).pipe(output);