Add reminders to the macOS Reminders.App from the command line

reminder.js

#!/usr/bin/env osascript -l JavaScript

// Add reminders to the macOS Reminders.App from the command line

const RemindersApp = Application('Reminders');

// - Examples -
// Add a new item:
// ./reminder.js add "My cool new reminder"
// Show all available lists:
// ./reminder.js list
// Add item to a specific list (here list #2):
// ./reminder.js add 2 "My cool new reminder in list No. 2"
function run(argv) {
  [task, first, second] = argv;
  switch (task) {
    // Add a new item.
    // Either provide online the item as parameter or
    // first the list index (see below) and then the item.
    // For items with spaces etc. wrap them double quotes like "..."
    case 'add':
      // If there are two parameters provided let the first one be the list id
      var name, listIndex;
      if (second) {
        listIndex = parseInt(first);
        name = second;
      } else {
        name = first;
      }

      var list = listIndex ? RemindersApp.lists[listIndex] : RemindersApp.defaultList;
      var reminder = RemindersApp.Reminder({name: name});
      list.reminders.push(reminder);
      break;

    // Get a list of all the available reminder lists.
    // Each comes with an index number which can be
    // used to add items to this specific list.
    case 'list':
      var lists = RemindersApp.lists
      for (let index = 0; index < lists.length; index++) {
        const list = lists[index];
        console.log(`${index}: ${list.name()}`)
      }
      break;

    default:
      console.log("No task specified")
      break;
  }

}