Provide folding of blocks

[chrislong]

It would be great to hide/show blocks of a terraform file with something like folding mode or outline mode. I put together some code to make it work with outline-minor-mode. Feel free to adapt it, etc.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Allow simple visibility toggling in outline mode with TAB
;;

(defun my-outline-toggle-or-indent (&optional ARG)
  (interactive)
  (if (outline-on-heading-p)
	  (outline-toggle-children)
	(indent-for-tab-command ARG)
	)
  )

(define-key outline-minor-mode-map "\C-i" 'my-outline-toggle-or-indent)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; set outline headings for terraform mode
;;

(defun my-terraform-mode-hook ()
  (make-local-variable 'outline-regexp)
  (setq outline-regexp
		(concat
		 (mapconcat (lambda (item)
					  (and (car item) (format "\\(%s\\)" (regexp-quote (car item))))
					  )
					imenu-generic-expression
					"\\|")
		 "[[:blank:]].*{[[:blank:]]*$")
		)
  (setq outline-heading-alist
		(mapcar (lambda (item)
				  (cons (car item) 2)
				  )
				imenu-generic-expression)
		)
  (outline-minor-mode 1)
  )

	   
(add-hook 'terraform-mode-hook 'my-terraform-mode-hook)

[jtoss]

Another option is to use yafolding mode from https://github.com/zenozeng/yafolding.el, I found it works pretty well with indented files.

[Fuco1]

I took the code from OP and cleaned it up a bit and included automatic setup for outline mode.

You still have to manually enable outline-minor-mode somewhere in your config in terraform-mode. Then you can use C-c C-f to fold blocks.