json-update/lib/json-update.js

Allows for very simple JSON file updating in one line

// Generated by ToffeeScript 1.6.3-4
(function() {
  var cfg, deepExtend, fs, lockfile, opts, pify, und;

  fs = require('fs-extra');

  lockfile = require('lockfile');

  und = require('underscore');

  deepExtend = require('deep-extend');

  pify = require('pify');

  opts = {
    wait: 2000,
    stale: 30000,
    retries: 2,
    retryWait: 100
  };

  cfg = {
    deep: false
  };

  exports.config = function(conf) {
    return cfg = und.extend(cfg, conf);
  };

  function fixempty(cb) {
    if (cb == null) {
      return (function() {});
    } else {
      return cb;
    }
  };

  function doload(filename, unlock, cb) {
    var data, e, er, err,
      _this = this;
    cb = fixempty(cb);
    lockfile.lock("" + filename + ".lock", opts, function() {
      er = arguments[0];
      if (er != null) {
        return cb(er);
      } else {
        fs.readFile(filename, 'utf8', function() {
          err = arguments[0], data = arguments[1];
          if (unlock) {
            lockfile.unlock("" + filename + ".lock", function() {
              _$$_0();
            });
          } else {
            _$$_0();
          }
          function _$$_0() {
            if (err != null) {
              return cb(new Error("Error reading JSON file " + filename + ": " + (err != null ? err.message : void 0)));
            }
            try {
              return cb(null, JSON.parse(data));
            } catch (_error) {
              e = _error;
              return cb(new Error("Error parsing JSON in " + filename + ". Data is " + data + ". Error was " + e.message));
            }
          };
        });
      }
    });
  };

  function load(filename, cb) {
    return doload(filename, true, cb);
  };

  function update(filename, obj, cb) {
    var err, filedata,
      _this = this;
    cb = fixempty(cb);
    function loaded(data) {
      var err,
        _this = this;
      if (!cfg.deep) {
        data = und.extend(data, obj);
      } else {
        deepExtend(data, obj);
      }
      fs.outputJson(filename, data, function() {
        err = arguments[0];
        lockfile.unlock("" + filename + ".lock", function() {
          if (err != null) {
            return cb(new Error("Problem saving JSON file: " + (err != null ? err.message : void 0)));
          }
          return cb(null, data);
        });
      });
    };
    fs.exists(filename, function(_$$_3) {
      _$cb$_2(!_$$_3);
    });
    function _$cb$_2(_$$_1) {
      if (_$$_1) {
        return loaded({}, false);
      } else {
        doload(filename, false, function() {
          err = arguments[0], filedata = arguments[1];
          return loaded(filedata, false);
        });
      }
    };
  };

  exports.load = pify(load);

  exports.update = pify(update);

}).call(this);