To get this to work you will need to generate a credentials.json file that will correspond with a google account that you ow that will correspond with a google account that you own.
Follow this: https://developers.google.com/calendar/quickstart/ruby
It will also lead you through the creation / authorization of the token.yaml file
Run the program with:
bin/run.sh
Will need to have set CALENDAR_KEY environment variable somehow.
I use a file called aliases.sh which has the following in it:
export CALENDAR_KEY="some-calendar-key"
If you just want to put stuff on your main calendar then just set this to 'primary' ls {lib,spec}/*.rb | entr rspec