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How can I set the default of truncate-lines for dired buffers to truncate?

I.e. when I open a new dired buffer it should show the directory truncated and not wrapped into the next line.

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(defun my-dired-mode-hook ()
  "Custom behaviours for `dired-mode'."
  ;; `truncate-lines' is automatically buffer-local.
  (setq truncate-lines t))

(add-hook 'dired-mode-hook #'my-dired-mode-hook)
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    You can add -local after setq and spare the comment – Stefan Jan 29 '20 at 13:13
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    Using setq-local in the context of setting truncate-lines potentially implies that the user has failed to take the time to investigate whether the variable was already buffer-local. Or worse, it could mean that the user erroneously thought it was a global variable. Users should be encouraged, in my opinion, to investigate and learn which variables are global and which ones have already been pre-defined as being buffer-local. – lawlist Jan 29 '20 at 19:58
  • I agree with both Stefan and lawlist :) I used plain setq with a comment for the benefit of the reader, so that they would also learn that some variables are automatically buffer-local, if they were not already aware. – phils Jan 29 '20 at 21:43
  • Thanks for this, @phils. Side note: Because truncate-lines is a (buffer-local) variable I can even put truncate-lines: t in the .dired or .dir-locals.el file. :-) – halloleo Jan 30 '20 at 2:54
  • @halloleo If you use .dir-locals.el (or indeed .dired, although that is deprecated), then the value is set buffer-locally (by way of make-local-variable) regardless of whether or not a plain setq would do the same thing. – phils Jan 30 '20 at 5:17

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