This is a simple gem that can be setup as a Discord bot to calculate the distance between two geographical points. Distance can be returned in miles and kilometers.
First install as a global gem.
gem install discord_distance_calculator
Navigate to your gem path. This will vary based on your ruby version and your ruby environment manager (rbenv or rvm). For example on my machine with rbenv and ruby 2.4.1, it would be installed here:
~/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/discord_distance_calculator<version>
Create a .env file in this directory. Inside here you will need 3 API keys: A map service key for Geocoder (usually sourced from Google Maps API), a Discord token, and a Discord client id. Insert these into your .env file as the following variables:
GEOCODER=
DISCORD_TOKEN=
DISCORD_CLIENT_ID=
Now you are ready to start your bot. This will run as a server, so open a new terminal or start it as a daemon.
bundle exec discord_distance_calculator discord_distance_bot
The distance calculator will now listen for !distance along with two parameters representing the two locations.