nesh/lib/plugins/history.js

An enhanced, extensible shell for Node.js

// Generated by CoffeeScript 1.11.1

/*
History Plugin - adds persistent history to the interpreter so
long as no `.history` command has already been defined.

This plugin adds two new options:

 * historyFile: the filename of where to store history lines
 * historyMaxInputSize: Maximum number of bytes to load from
                        the history file

History support can be disabled by setting `historyFile` to
null or false in the interpreter options on startup:

    nesh.start({historyFile: null}, function (err) { ... });
 */

(function() {
  var fs, path;

  fs = require('fs');

  path = require('path');

  exports.name = 'history';

  exports.description = 'Provides persistent history between sessions';

  exports.setup = function(context) {
    var config, defaults, ref;
    ref = context.nesh, defaults = ref.defaults, config = ref.config;
    if (defaults.historyFile == null) {
      defaults.historyFile = path.join(config.home, '.node_history');
    }
    return defaults.historyMaxInputSize != null ? defaults.historyMaxInputSize : defaults.historyMaxInputSize = 10240;
  };

  exports.postStart = function(context) {
    var buffer, cmd, fd, lastLine, maxSize, readFd, repl, size, stat;
    repl = context.repl;
    if (!repl.opts.historyFile) {
      return;
    }
    if (repl.commands['.history']) {
      return;
    }
    maxSize = repl.opts.historyMaxInputSize;
    lastLine = null;
    try {
      stat = fs.statSync(repl.opts.historyFile);
      size = Math.min(maxSize, stat.size);
      readFd = fs.openSync(repl.opts.historyFile, 'r');
      buffer = new Buffer(size);
      fs.readSync(readFd, buffer, 0, size, stat.size - size);
      repl.rli.history = buffer.toString().split('\n').reverse();
      if (stat.size > maxSize) {
        repl.rli.history.pop();
      }
      if (repl.rli.history[0] === '') {
        repl.rli.history.shift();
      }
      repl.rli.historyIndex = -1;
      lastLine = repl.rli.history[0];
    } catch (error) {}
    fd = fs.openSync(repl.opts.historyFile, 'a');
    repl.rli.addListener('line', function(code) {
      if (code && code.length && code !== '.history' && lastLine !== code) {
        fs.write(fd, code + "\n", function() {});
        return lastLine = code;
      }
    });
    repl.rli.on('exit', function() {
      return fs.close(fd, function() {});
    });
    cmd = {
      help: 'Show command history',
      action: function() {
        repl.outputStream.write((repl.rli.history.slice(0).reverse().join('\n')) + "\n");
        return repl.displayPrompt();
      }
    };
    return repl.defineCommand('history', cmd);
  };

}).call(this);

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