nesh/lib/plugins/builtins.js

An enhanced, extensible shell for Node.js

// Generated by CoffeeScript 1.11.1

/*
Builtin Utilities Plugin
 */

(function() {
  var _, crypto, querystring;

  _ = require('underscore');

  crypto = require('crypto');

  querystring = require('querystring');

  exports.name = 'builtins';

  exports.description = 'Exposes built-in convenience methods';

  exports.postStart = function(context) {
    var cmd, repl;
    repl = context.repl;

    /*
    Underscore utilities, see:
    http://documentcloud.github.io/underscore
     */
    repl.context.__ = _;

    /*
    Hashing functions
     */
    repl.context.md5 = function(value) {
      return crypto.createHash('md5').update(value).digest('hex');
    };
    repl.context.sha = function(value) {
      return crypto.createHash('sha1').update(value).digest('hex');
    };

    /*
    Random functions
     */
    repl.context.rand = function(start, end) {
      if (start == null) {
        start = 0;
        end = 1;
      } else if (end == null) {
        end = start;
        start = 0;
      }
      return Math.random() * (end - start) + start;
    };
    repl.context.randInt = function(start, end) {
      return Math.round(repl.context.rand(start, end));
    };
    repl.context.randChoices = function(choices, length) {
      var result;
      if (length == null) {
        length = 1;
      }
      result = [];
      while (--length >= 0) {
        result.push(choices[Math.floor(Math.random() * choices.length)]);
      }
      return result;
    };
    repl.context.randString = function(length, charSet) {
      if (charSet == null) {
        charSet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
      }
      return repl.context.randChoices(charSet.split(''), length).join('');
    };
    repl.context.randHex = function(length) {
      return repl.context.randString(length, 'abcdef0123456789');
    };

    /*
    Number representation shortcuts
     */
    repl.context.bin = function(val) {
      return val.toString(2);
    };
    repl.context.oct = function(val) {
      return val.toString(8);
    };
    repl.context.hex = function(val) {
      return val.toString(16);
    };

    /*
    URL encoding / decoding
     */
    repl.context.querystring = querystring;
    repl.context.urlenc = querystring.escape;
    repl.context.urldec = querystring.unescape;

    /*
    REPL Commands
     */
    cmd = {
      help: 'Clear the screen',
      action: function() {
        repl.outputStream.write('\u001B[2J\u001B[0;0f');
        return repl.displayPrompt();
      }
    };
    return repl.defineCommand('cls', cmd);
  };

}).call(this);

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