32

I would like emacs to switch to gnuplot-mode when I open a file ending in .g or .gnuplot.

I tried 

;; gnuplot mode-name
(add-to-list 'gnuplot-mode '("\\.g\\'" . gnuplot-mode))

or 

;; gnuplot mode-name
(add-to-list 'gnuplot '("\\.g\\'" . gnuplot))

Neither works. How do I make Emacs behave this way?

Dan
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Stein
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1 Answers1

32

The full syntax for specifying file extensions for gnuplot-mode is: 

(add-to-list 'auto-mode-alist '("\\.g\\'" . gnuplot-mode))

The other point to verify is that you are using Bruce Ravel's recent (year 2012) implementation of gnuplot-mode. This is a separate MELPA package that requires gnuplot version 4.4 and higher.

Lastly avoid gnuplot-mode files that come pre-packaged with gnuplot itself. They have not been kept compatible with newer emacs versions.

Stefan
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    You can make that a bit more concise by using `add-to-list`. Also relevant: `C-h i g (elisp) Auto Major Mode`. – Kaushal Modi Nov 05 '15 at 23:50
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    @kaushalmodi: since `add-to-list` is probably the canonical idiom, could you add that as a separate answer for future users? – Dan Nov 06 '15 at 13:04