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I'd like tab-width to be set to 2 in all programming modes. I use prelude (which might be one of the problems), but I have this in my custom.el (which is sort of the analogue to .emacs):

(setq my-tab-width 2)
(setq standard-indent my-tab-width)
(setq tab-width my-tab-width)
(setq c-basic-offset my-tab-width)
(setq js2-basic-offset my-tab-width)
(setq web-mode-attr-indent-offset my-tab-width)
(setq web-mode-code-indent-offset my-tab-width)
(setq web-mode-css-indent-offset my-tab-width)

How can I avoid all the duplication?

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  • If you want to set the default value of tab-width everywhere, use setq-default. If you want to set the value of tab-width in all modes that inherit from prog-mode then do what @dan suggested. – Drew Jan 12 '16 at 2:09
  • @Drew: Oops, I didn't mean to write '( but (setq instead. I'll change that. – Avery Jan 12 '16 at 6:10
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(Nearly) all programming modes inherit from prog-mode, so you can set the variable in prog-mode-hook:

(defun my-prog-mode-hook ()
  (setq tab-width 2))
(add-hook 'prog-mode-hook #'my-prog-mode-hook)

(Note that you could use a lambda instead, but this way you'll have an easier time removing the hook if you ever want to do so.)

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