For Notepad++, define a custom language for Squirrel. Luckily, samisalreadytaken has written a squirrel highlighter.
At the top, edit
ext="nut gnut"so it works with gnut files as well
Navigate to Language > User Defined Language > Define your language
Click import, and select Squirrel.xml
(If the colors/style are not to your taste) 1. Select ‘Squirrel’` in User Language at the top 2. Navigate through the tabs to find what you want to change 3. Click its ‘Styler’ button and make the changes you wish to
VSCode has extensions avaliable for working with squirrel, and searching “squirrel” in the extensions marketplace will give you them.
However, installing this will only create an associastion for .nut files, and not .gnut files. To fix this:
Open a .gnut file
Do CTRL+K, M (not CTRL+K, CTRL+M)
Configure File Association for .gnut
Squirrel(only appears if you have the extension)