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I understand from here, that I can use dir-locals.el to customize modes, such as given in the example:

      ;; Warn about spaces used for indentation:
      (haskell-mode . ((eval . (highlight-regexp "^ *"))))
      (c-mode . ((c-file-style . "BSD")))
      (java-mode . ((c-file-style . "BSD")))
      ("src/imported"
       . ((nil . ((change-log-default-name . "ChangeLog.local"))))))

However, all of these make 1 change per language-mode. I would like to make multiple changes to the same mode, python-mode, and I think my syntax is only keeping the first one.

What's the right syntax to combine these two variables settings in dir-locals.el?

I have:

;; misc
((python-mode
  (python-shell-buffer-name . "Python[This Project]")))

;; set the local pyvenv
((python-mode . ((pyvenv-activate . "./envs/default")
                 )))

;; find local pylintrc vs global
((python-mode . ((eval . (lambda ()  (setq flycheck-pylintrc ".pylintrc"))))))

Other refs consulted:

Mittenchops
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    For each mode you can have an alist. The alist can specify any number of settings. See the example with `nil` (which stands for any mode) in the Emacs Wiki page you cite. Change `nil` to `python-mode` and you have an example of setting multiple things for Python mode. – Drew Nov 10 '20 at 18:46
  • Could you point me to an example? – Mittenchops Dec 23 '20 at 21:22
  • It's like that TV game show where the contestants are given an answer and have to respond with a matching question. – phils Jun 24 '22 at 07:34

2 Answers2

4

The dir-locals file contains an alist of nested alists. This would be the correct form for your example of setting multiple variables for python-mode:

((python-mode . ((python-shell-buffer-name . "Python[This Project]")
                 (pyvenv-activate . "./envs/default")
                 (eval . (lambda ()  (setq flycheck-pylintrc ".pylintrc")))))
 (other-mode . (... ALIST)))
Anders Johansson
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4

This is already answered, but just for another perspective:

If you just want to avoid syntax problems or view correct syntax, you can call add-dir-local-variable. It prompts for a mode, then a variable, then a setting. You can do this twice for the one mode, then open your .dir-locals.el file and view the correct syntax.

user27075
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  • n.b. This works best since Emacs 27.1, when the command was changed so that it generated the preferred dotted-pair notation. – phils Jun 24 '22 at 11:40