Preparing restored iCloud Calendar Events to be imported in a new Calendar

README.md

See http://fokkezb.nl/2015/01/13/how-to-restore-a-deleted-icloud-calendar/

ics.js

var fs = require('fs'),
  path = require('path');

var glob = require('glob'),
  uuid = require('node-uuid');

var input = process.argv[2] || '';
var output = process.argv[3] || '';

fs.exists(input, function it(exists) {

  if (!exists) {
    console.error('Input path not found: ' + input);

  } else {

    fs.exists(output, function it(exists) {

      if (!exists) {
        console.error('Output path not found: ' + output);

      } else {

        glob('**/*.ics', {
          cwd: input
        }, function handle(err, files) {

          if (err) {
            console.error(err);
          } else {

            files.forEach(function forEach(file, fileNr) {
              var inputFilePath = path.join(input, file);

              fs.readFile(inputFilePath, 'utf8', function handle(err, inputData) {

                if (err) {
                  console.error(inputFilePath + ': ' + err);

                } else {

                  var outputFilePath = path.join(output, path.basename(file));
                  var inputLines = inputData.split('\r\n');
                  var outputLines = [];

                  inputLines.forEach(function forEach(inputLine, index) {
                    var outputLine;

                    if (inputLine.substr(0, 2) === 'X-') {
                      return;

                    } else {
                      var parts = inputLine.split(':');

                      if (parts[0] === 'UID') {
                        var newUid = uuid.v4().toUpperCase();

                        if (path.basename(file) === parts[1] + '.ics') {
                          outputFilePath = path.join(output, newUid + '.ics');
                        }

                        parts[1] = newUid;
                        inputLine = parts.join(':');
                      }

                      if (outputLine) {
                        console.log(inputLine + ' > ' + outputLine);

                        outputLines.push(outputLine);

                      } else {
                        outputLines.push(inputLine);
                      }
                    }

                  });

                  var outputData = outputLines.join('\r\n');

                  // console.log(inputFilePath);
                  // console.log(inputData);
                  // console.log(outputFilePath);
                  // console.log(outputData);
                  
                  fs.writeFile(outputFilePath, outputData, function(err) {

                    if (err) {
                      console.error(inputFilePath + ': ' + err);
                    }

                  });

                }

              });

            });

          }

        });

      }
    });

  }
});

package.json

{
  "name": "ics",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "MIT",
  "dependencies": {
    "glob": "^4.3.3",
    "node-uuid": "^1.4.2"
  }
}

I couldn't get node.js to work, so I rewrote this in Python. Thanks for the article; I have no idea how I deleted my calendar, but i was an important one, and this worked perfectly!