kakapo-mode

Use TABS or SPACES (but not both!) for indentation (leading whitespace), and SPACES for everything else.

Install

You can find this package in MELPA, and just install with the list-packages command in Emacs. For a guide on adding MELPA to your Emacs setup, see this page.

Basic Configuration

As the "Installation" section in kakapo-mode.el suggests, you might want to put in the following in your ~/.emacs.d/init.el:

(require 'kakapo-mode)
(add-hook 'text-mode-hook 'kakapo-mode)
(add-hook 'prog-mode-hook 'kakapo-mode)
; `kakapo-open` *requires* evil-mode!
(define-key evil-normal-state-map "o" (lambda () (interactive) (kakapo-open nil)))
(define-key evil-normal-state-map "O" (lambda () (interactive) (kakapo-open t)))
(define-key evil-insert-state-map (kbd "RET") 'kakapo-ret-and-indent)
(define-key evil-insert-state-map (kbd "DEL") 'kakapo-backspace)
(define-key evil-insert-state-map (kbd "<S-backspace>") 'kakapo-upline)

. This is the simplest setup; it is important to note that the kakapo-open function calls (evil-append nil) in its body and therefore requires evil-mode to work properly. If you do not use evil-mode, you probably don't need to use kakapo-open at all; still, change the calls to define-key to work with your non-evil-mode setup.

Advanced Configuration

You can choose to unify all of your indentation settings (and also enable per-project settings) by creating a file kakapo-project-settings.el in your ~/.emacs.d/ folder or some such, and then load it into your .emacs.d/init.el. Your ~/.emacs.d/init.el will now look like this:

(load "~/.emacs.d/kakapo-project-settings")
(require 'kakapo-mode)
(add-hook 'prog-mode-hook 'l/kakapo-indents)
(add-hook 'text-mode-hook 'l/kakapo-indents)
(add-hook 'conf-mode-hook 'l/kakapo-indents)
(add-hook 'css-mode-hook 'l/kakapo-indents)
; `kakapo-open` *requires* evil-mode!
(define-key evil-normal-state-map "o" (lambda () (interactive) (kakapo-open nil)))
(define-key evil-normal-state-map "O" (lambda () (interactive) (kakapo-open t)))
(define-key evil-insert-state-map (kbd "RET") 'kakapo-ret-and-indent)
(define-key evil-insert-state-map (kbd "DEL") 'kakapo-backspace)
(define-key evil-insert-state-map (kbd "<S-backspace>") 'kakapo-upline)

. Notice how the add-hook calls the function l/kakapo-indents, which is defined in kakapo-project-settings.el. You can then set kakapo-project-settings.el as follows:

(defun l/add-hook (hook tmode twidth &optional func)
(add-hook hook `(lambda ()
	(when (not l/kakapo-settings-applied)
	(kakapo-mode)
	(electric-indent-mode -1)
	(setq indent-tabs-mode ,tmode)
	(setq tab-width ,twidth)
	(setq evil-shift-width ,twidth)
	(setq l/kakapo-settings-applied t)
	(eval ,func)
	(message (concat
		(if (boundp 'l/kakapo-project-id)
		(concat "kakapo project `" l/kakapo-project-id "'")
		"kakapo defaults") ": "
		"indent-tabs-mode=%s "
		"tab-width=%s "
		"evil-shift-width=%s ")
		indent-tabs-mode
		tab-width
		evil-shift-width)))))

; Check if a buffer's name matches the a project's path (regex). If it does,
; then also set the project-id.
(defun l/kakapo-set-project-id (project-id project-regex buffer-name)
(when (string-match project-regex buffer-name)
	(setq l/kakapo-project-id project-id)))

; Adapted from KimStorm's solution from http://www.emacswiki.org/ProjectSettings.
(defun l/kakapo-indents ()
(let
	(
	(b (buffer-file-name))
	(h (getenv "HOME")))
	(defun h (hook tmode twidth &optional func)
	(l/add-hook hook tmode twidth func))
	(setq l/kakapo-settings-applied nil)
	; Default settings for unrecognized languages.
	(kakapo-mode)
	(setq indent-tabs-mode t)
	(setq tab-width 4)
	(setq evil-shift-width 4)
	; Language-specific settings.
	(when b
	; C
	(h 'c-mode-hook t 8
		'(progn
		(setq default-tab-width 8)))
	; C++
	(h 'c++-mode-hook t 8
		'(progn
		(setq default-tab-width 8)))
	; CSS
	(h 'css-mode-hook nil 2
		'(progn
		(setq css-indent-offset 2)))
	; Emacs lisp
	(h 'emacs-lisp-mode-hook nil 2)
	; Haskell
	(h 'haskell-mode-hook nil 2)
	; Literate Haskell.
	(if (string-match "\\.lhs$" b)
		(progn
		(h 'latex-mode-hook nil 2)
		(setq mmm-global-mode 't)
		(setq mmm-submode-decoration-level 1)
		(mmm-ify-by-class 'literate-haskell-latex)
		(column-enforce-mode)))
	; HTML
	(h 'html-mode-hook t 4)
	; Idris
	(h 'idris-mode-hook nil 2)
	; Latex
	(h 'latex-mode-hook nil 2)
	; Markdown
	(h 'markdown-mode-hook t 4
		'(progn
		(define-key markdown-mode-map [backspace] nil)
		(define-key markdown-mode-map [tab] nil)))
	; Nix expression language
	(h 'nix-mode-hook nil 2)
	; Org-mode
	(h 'org-mode-hook nil 2)
	; Python
	(h 'python-mode-hook nil 4
		'(progn
		(setq python-indent 4)))
	; Ruby
	(h 'ruby-mode-hook nil 2
		'(progn
		(setq ruby-indent-level 2)))
	; Shell
	(h 'sh-mode-hook t 4)
	; Shen
	(h 'shen-mode-hook nil 2)

	; Additional project-specific settings.
	(if (or
		(l/kakapo-set-project-id "elementary-haskell" (concat h "/prog/elementary-haskell/") b)
		(l/kakapo-set-project-id "codex" "prog/codex/" b)
		(l/kakapo-set-project-id "new-keyboard (esrille nisse)" (concat h "/prog/nisse/new-keyboard/") b))
		(progn
		(h 'haskell-mode-hook nil 4)
		(h 'c-mode-hook nil 4
			'(progn
			(setq default-tab-width 4)))
		(h 'python-mode-hook nil 4
			'(progn
			(setq python-indent 4)))))
	(if (or
		(l/kakapo-set-project-id "miro" "prog/miro/" b)
		(l/kakapo-set-project-id "lovelace" "prog/lovelace/" b))
		(progn
		(add-hook 'haskell-mode-hook 'l/haskell-intero-setup)
		(h 'haskell-mode-hook nil 2)
		(h 'c-mode-hook t 8
			'(progn
			(setq default-tab-width 8)))
		(h 'python-mode-hook nil 4
			'(progn
			(setq python-indent 4)))
		(h 'sh-mode-hook t 4)))

		(if (l/kakapo-set-project-id "gv" "prog/gv/" b)
		(h 'sh-mode-hook nil 2)))))

Now, you have per-project indentation settings that are different than the default ones. If you know emacs lisp, you can probably write a less repetitive block of code than the above.

Quirks

Haskell

The haskell-cabal-mode major mode that comes with haskell-mode, as of 2015-01-13 seems to remap keys and somehow ignore Kakapo mode. You can still make Kakapo work by doing the following:

(evil-define-key 'insert haskell-cabal-mode-map (kbd "<tab>") 'kakapo-tab)
(evil-define-key 'insert haskell-cabal-mode-map (kbd "DEL") 'kakapo-backspace)
(add-hook 'haskell-cabal-mode-hook
	(lambda ()
		(kakapo-mode)
		(setq indent-tabs-mode nil)
		(setq tab-width 2)
		(setq evil-shift-width 2)
	)
)

How to contribute

Fork it to your Github account.
Create a new branch named after your feature/bugfix/intention.
Push your branch to your forked repo.
Create a pull request!

Ideally, I'd love to use Git's own policy of having a read-only official repo, with the development/discussion taking place in a mailing list. But as this project is so small, the above way is probably best.

Bugs? Comments? Issues? Concerns? Opinions?

Please don't hesitate to write comments, suggestions, and/or observations to the issue tracker. Click on the green "New issue" button to voice your concerns. You might write, "kakapo-mode totally sucks." And, maybe it does! But please tell us why it sucks, so that we can hopefully make it better.

listx/kakapo-mode