This script reads from the local Calendar.app database. You'll need to have all of your calendars added and synced for this to work.
Install icalBuddy
brew install ical-buddy
Update path to icalBuddy in the script. To confirm the path, run which icalBuddy and update the variable called icalBuddyPath.
Set the calendars to read and write to. To get the UIDs of your calendars, you can run the following command
icalBuddy calendars
The readID and writeID can be the same thing if you want. I had originally made it so that you could write to a separate calendar so you could hide it and keep your calendar clean. Seems, though, that Google Calendar ignores separate calendars when people schedule with you, so this might be pointless now.
These are the variables you can update
blockedEventName- Be careful with what you name this. You'll want it to be something unique, otherwise events could get removed that you didn't intend to
daysToRead- How many days out you want the script to look.
icalBuddyPath- see installation instructions
osascript block_calendar.js