[smoothdeveloper]

  brew install mono
  brew cask install visual-studio-code

once you are in vscode, install ionide: http://ionide.io

You are ready to script (or more) with a great / lightweight editor.

[oblique63]

Spacemacs[0] with its F# layer enabled is also painless to set up, if that's more your cup of tea:

http://blog.nikosbaxevanis.com/2015/04/25/fsharp-on-emacs-wi...

[0] http://spacemacs.org/