qrepl/lib/index.js

quick repl helper

// Generated by CoffeeScript 1.12.4
(function() {
  var colored, colors, fs, getHomeDir, historyPath, objectAssign, path, readline, util;

  readline = require('readline');

  fs = require('fs');

  path = require('path');

  util = require('util');

  objectAssign = require('object-assign');

  getHomeDir = function() {
    return process.env.HOME || process.env.HOMEPATH || process.env.USERPROFILE;
  };

  historyPath = function(name) {
    return path.resolve(getHomeDir(), '.' + name + '.qrepl');
  };

  colors = {
    red: 31,
    green: 32,
    yellow: 33,
    blue: 34,
    magenta: 35,
    cyan: 36
  };

  colored = function(s, color) {
    var color_code, prefix, suffix;
    color_code = colors[color] || 0;
    prefix = '\x1b[' + color_code + 'm';
    suffix = '\x1b[0m';
    return prefix + s + suffix;
  };

  module.exports = function(name, fn, options) {
    var loadHistory, prompt_text, rl, rl_addHistory, saveHistory;
    if (options == null) {
      options = {};
    }
    loadHistory = function(cb) {
      return fs.readFile(historyPath(name), function(err, history_data) {
        var history_lines;
        if (!history_data) {
          return cb(null, []);
        }
        history_lines = history_data.toString().trim().split('\n');
        history_lines.reverse();
        return cb(null, history_lines);
      });
    };
    saveHistory = function(line) {
      return fs.appendFileSync(historyPath(name), line + '\n');
    };
    rl = readline.createInterface(objectAssign({
      input: process.stdin,
      output: process.stdout
    }, options));
    rl_addHistory = rl._addHistory;
    rl._addHistory = function() {
      var last, line;
      last = rl.history[0];
      line = rl_addHistory.call(rl);
      if (last !== line) {
        saveHistory(line);
      }
      return line;
    };
    loadHistory(function(err, saved_history) {
      return rl.history.push.apply(rl.history, saved_history);
    });
    prompt_text = '> ';
    rl.setPrompt(colored(prompt_text, 'cyan'), prompt_text.length);
    rl.prompt();
    return rl.on('line', function(line) {
      line = line.trim();
      return fn(line, function(err, result) {
        if (err != null) {
          if (Array.isArray(err)) {
            err.map(function(err) {
              return console.error(colored(err.message, 'red'));
            });
          } else {
            console.error(err);
          }
        } else if (result != null) {
          if (typeof result === 'string') {
            console.log(result);
          } else {
            console.log(util.inspect(result, {
              colors: true,
              depth: null
            }));
          }
        }
        return rl.prompt();
      });
    });
  };

}).call(this);