move gcal push hook from gists to sources

how-update-gooogle-calendar-pre-push-hook/hook.js

@@ -0,0 +1,106 @@
+#!/usr/bin/env node
+
+const fs = require("fs")
+const readline = require("readline")
+const { google } = require("googleapis")
+const util = require("util")
+const exec = util.promisify(require("child_process").exec)
+
+// If modifying these scopes, delete token.json.
+const SCOPES = ["https://www.googleapis.com/auth/calendar.events"]
+// The file token.json stores the user's access and refresh tokens, and is
+// created automatically when the authorization flow completes for the first
+// time.
+const TOKEN_PATH = "token.json"
+
+// 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);
+  authorize(JSON.parse(content), patchCalendar)
+})
+
+/**
+ * Create an OAuth2 client with the given credentials, and then execute the
+ * given callback function.
+ * @param {Object} credentials The authorization client creden:Qtials.
+ * @param {function} callback The callback to call with the authorized client.
+ */
+const 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.
+ */
+const 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) return console.error(err)
+        console.log("Token stored to", TOKEN_PATH)
+      })
+      callback(oAuth2Client)
+    })
+  })
+}
+
+const slideCount = async () => {
+  const cmd = "grep '##' src/presentation.md | wc -l"
+  const { stdout } = await exec(cmd)
+  return stdout
+}
+
+const patchCalendar = async auth => {
+  const preExistingSlides = 84
+  const targetSlides = 120
+  const eventId = "0g1fr1etmld3i9p54v3oti2lep"
+  const calendar = google.calendar({ version: "v3", auth })
+
+  const event = await calendar.events.get({
+    calendarId: "primary",
+    eventId,
+  })
+
+  const resource = event.data
+  const slides = await slideCount()
+  const adjustedSlides = slides - preExistingSlides
+  resource.summary = `Coach: ${adjustedSlides}/${targetSlides} slides`
+
+  await calendar.events.patch({
+    calendarId: "primary",
+    eventId,
+    resource,
+  })
+
+  console.log(`SLIDES: ${adjustedSlides}/${targetSlides}`)
+}