Re: Display "dash" as "minus" in programming language mode?

[Torsten Bronger]

Hallöchen!

Pascal J. Bourguignon writes:

> Torsten Bronger <bronger@physik.rwth-aachen.de> writes:
>
>> I have an arguably odd question: Is it possible to tell Emacs to
>> display every "dash" character as an "en-dash" character?
>>
>> The reason is that I use the DejaVu fonts which have a
>> particularly short dash.  In source code, this is unfortunate.
>> Is is possible to use e.g. font-lock-mode to substitute "en-dash"
>> or "minus" for every "dash"?
>
> Yes, it's trivial:
>
> (font-lock-add-keywords nil
>    '(("-" (0 (progn (compose-region (match-beginning 0) (match-end 0)  "–"
>                                   'decompose-region)
>                      nil)))))

Thanks to both of you.  I now use

(add-hook 'python-mode-hook
          (lambda ()
            (font-lock-add-keywords nil
                                    '(("\\B-\\B"
                                       (0 (progn (compose-region 
(match-beginning 0) (match-end 0)  "−"
                                                                 
'decompose-region)
                                                 nil)))
                                      ))))
(add-hook 'python-mode-hook
          (lambda ()
            (aset (or buffer-display-table
                      (setq buffer-display-table (make-display-table)))
                  ?* [?✻])))

Although the heuristics are not perfict, it works quite nicely.

Tschö,
Torsten.

-- 
Torsten Bronger, aquisgrana, europa vetus
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