const fs = require('fs');
const jq = require('node-jq')
const readline = require('readline');
const {google} = require('googleapis');

// If modifying these scopes, delete token.json.
const SCOPES = ['https://www.googleapis.com/auth/calendar.readonly'];
const TOKEN_PATH = 'token.json';
const CALENDAR_ID = 'hem870ffa21nkf91a8n05llmss@group.calendar.google.com'
const CALENDAR_DATA_PATH = '../_data/calendar.yml'
const max_results = 6

// Load client secrets from a local file.
fs.readFile('credentials.json', (err, content) => {
  if (err) return console.log('Error loading client secret file:', err);
  // Authorize a client with credentials, then call the Google Calendar API.
  authorize(JSON.parse(content), listEvents);
});

/**
 * Create an OAuth2 client with the given credentials, and then execute the
 * given callback function.
 * @param {Object} credentials The authorization client credentials.
 * @param {function} callback The callback to call with the authorized client.
 */
function authorize(credentials, callback) {
  const {client_secret, client_id, redirect_uris} = credentials.installed;
  const oAuth2Client = new google.auth.OAuth2(
      client_id, client_secret, redirect_uris[0]);

  // Check if we have previously stored a token.
  fs.readFile(TOKEN_PATH, (err, token) => {
    if (err) return getAccessToken(oAuth2Client, callback);
    oAuth2Client.setCredentials(JSON.parse(token));
    callback(oAuth2Client);
  });
}

/**
 * Get and store new token after prompting for user authorization, and then
 * execute the given callback with the authorized OAuth2 client.
 * @param {google.auth.OAuth2} oAuth2Client The OAuth2 client to get token for.
 * @param {getEventsCallback} callback The callback for the authorized client.
 */
function getAccessToken(oAuth2Client, callback) {
  const authUrl = oAuth2Client.generateAuthUrl({
    access_type: 'offline',
    scope: SCOPES,
  });
  console.log('Authorize this app by visiting this url:', authUrl);
  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
  });
  rl.question('Enter the code from that page here: ', (code) => {
    rl.close();
    oAuth2Client.getToken(code, (err, token) => {
      if (err) return console.error('Error retrieving access token', err);
      oAuth2Client.setCredentials(token);
      // Store the token to disk for later program executions
      fs.writeFile(TOKEN_PATH, JSON.stringify(token), (err) => {
        if (err) console.error(err);
        console.log('Token stored to', TOKEN_PATH);
      });
      callback(oAuth2Client);
    });
  });
}

/**
 * Lists the next 10 events on the user's primary calendar.
 * @param {google.auth.OAuth2} auth An authorized OAuth2 client.
 */
function listEvents(auth) {
  const calendar = google.calendar({version: 'v3', auth});
  calendar.events.list({
    calendarId: CALENDAR_ID,
    timeMin: (new Date()).toISOString(),
    maxResults: max_results,
    singleEvents: true,
    orderBy: 'startTime',
  }, (err, res) => {
    if (err) return console.log('The API returned an error: ' + err);
    const events = res.data.items;
    if (events.length) {
      console.log(`Upcoming ${max_results} events:`);
      events.map((event, i) => {
        const start = event.start.dateTime || event.start.date;
        console.log(`${start} - ${event.summary}`);
      });
      jq.run('[.[] | {\
          image_path: null,\
          alt: .summary,\
          title: .summary,\
          excerpt: .description,\
          url: .htmlLink,\
          start: {\
              date: .start.date,\
              date_time: .start.dateTime\
          },\
          end: {\
              date: .end.date,\
              date_time: .end.dateTime\
          },\
          created: .created,\
          updated: .updated\
        }]', events, {input: 'json', output: 'json'})
        .then((output) => {
          fs.writeFile(CALENDAR_DATA_PATH, JSON.stringify(output), (err) => {
            if (err) console.error(err);
            console.log('Calendar data stored to', CALENDAR_DATA_PATH);
          });
        })
        .catch((err) => {
          console.error(err)
        });
    } else {
      console.log('No upcoming events found.');
    }
  });
}

@@ -3939,16 +3939,25 @@
 y(output
+, null, 2
 ), (err)

Indent _data/calendar.yml