Node.js 中的重要API：命令行工具以及FS API 首个Node应用

2019-12-16

17:05:54

 

 

 

 

 

 

 

 

var fs = require('fs');
fs.readdir(__dirname,function(err,files){
    console.log(files);
});

 

 

 

 

/**
 * Module dependencies.
 */

var fs = require('fs');

fs.readdir(__dirname, function (err, files) {
  console.log('');

  if (!files.length) {
    return console.log('    33[31m No files to show!33[39m
');
  }

  console.log('   Select which file or directory you want to see
');

  function file(i) {
    var filename = files[i];

    fs.stat(__dirname + '/' + filename, function (err, stat) {
      if (stat.isDirectory()) {
        console.log('     '+i+'   33[36m' + filename + '/33[39m');
      } else {
        console.log('     '+i+'   33[90m' + filename + '33[39m');
      }

      if (++i == files.length) {
        console.log('');
        process.stdout.write('   33[33mEnter your choice: 33[39m');
        process.stdin.resume();
        process.stdin.setEncoding('utf8');
      } else {
        file(i);
      }
    });
  }

  file(0);

});

 

 

/**
 * Module dependencies.
 */

var fs = require('fs')
  , stdin = process.stdin
  , stdout = process.stdout

/**
 * Read the current directory.
 */

fs.readdir(__dirname, function (err, files) {
  console.log('');

  if (!files.length) {
    return console.log('    33[31m No files to show!33[39m
');
  }

  console.log('   Select which file or directory you want to see
');

  // called for each file walked in the directory
  function file(i) {
    var filename = files[i];

    fs.stat(__dirname + '/' + filename, function (err, stat) {
      if (stat.isDirectory()) {
        console.log('     '+i+'   33[36m' + filename + '/33[39m');
      } else {
        console.log('     '+i+'   33[90m' + filename + '33[39m');
      }

      if (++i == files.length) {
        read();
      } else {
        file(i);
      }
    });
  }

  // read user input when files are shown
  function read () {
    console.log('');
    stdout.write('   33[33mEnter your choice: 33[39m');

    stdin.resume();
    stdin.setEncoding('utf8');
    stdin.on('data', option);
  }

  // called with the option supplied by the user
  function option (data) {
    if (!files[Number(data)]) {
      stdout.write('   33[31mEnter your choice: 33[39m');
    } else {
      stdin.removeListener('data', option);
    }
  }

  // start by walking the first file
  file(0);
});

 

 完成:

/**
 * Module dependencies.
 */

var fs = require('fs')
  , stdin = process.stdin
  , stdout = process.stdout

/**
 * Read the current directory.
 */

fs.readdir(__dirname, function (err, files) {
  console.log('');

  if (!files.length) {
    return console.log('    33[31m No files to show!33[39m
');
  }

  console.log('   Select which file or directory you want to see
');

  // called for each file walked in the directory
  function file(i) {
    var filename = files[i];

    fs.stat(__dirname + '/' + filename, function (err, stat) {
      if (stat.isDirectory()) {
        console.log('     '+i+'   33[36m' + filename + '/33[39m');
      } else {
        console.log('     '+i+'   33[90m' + filename + '33[39m');
      }

      if (++i == files.length) {
        read();
      } else {
        file(i);
      }
    });
  }

  // read user input when files are shown
  function read () {
    console.log('');
    stdout.write('   33[33mEnter your choice: 33[39m');

    stdin.resume();
    stdin.setEncoding('utf8');
    stdin.on('data', option);
  }

  // called with the option supplied by the user
  function option (data) {
    if (!files[Number(data)]) {
      stdout.write('   33[31mEnter your choice: 33[39m');
    } else {
      stdin.removeListener('data', option);
    }
  }

  // start by walking the first file
  file(0);
});