Emacs major mode for scripting with the ion-shell.

You can download this package from github and put it in your load path, then use (require ion-mode). If you want to automatically active ion-mode, you would need to modify auto-mode-alist to your init.el. A full manual installation might look like:

(add-to-list 'load-path  (expand-file-name "/path/to/ion-mode"))
(require 'ion-mode)
(autoload 'ion-mode (locate-library "ion-mode") "Ion majore mode" t)
(add-to-list 'auto-mode-alist '("\\.ion\\'" . ion-mode))
(add-to-list 'auto-mode-alist '("/ion/initrc" . ion-mode))

Alternatively, you can use straight and/or use-package. I use

;; Assuming that use-package and straight are already setup
(use-package ion-mode
  :straight (ion-mode
	       :host github :repo "iwahbe/ion-mode")
  :mode (("\\.ion\\'" . ion-mode)
		 ("/ion/initrc\\'" . ion-mode))
  )

This package has no dependencies.

Currently ion-mode provides syntax highlighting using font-lock and mode specific indentation. Details can be found in ion-mode.el, but nothing should require customization. If you use company, then ion-mode provides a backend called company-ion. This can be added in the normal way:

(add-to-list 'company-backends #'company-ion)

Example: