show tabs and white space

show tabs and white space

[mgrd]

For editing a Makefile I need to display/show the tabs and white spaces
within it.

Does anybody know how to obtain this?

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Re: show tabs and white space

[rgb]

mgrd wrote:
> For editing a Makefile I need to display/show the tabs and white
spaces
> within it.
>
> Does anybody know how to obtain this?
>

If you want to be able to spot the difference between a tab
and a space character you could highlight tabs like this.

(defface tab-face '((t (:background "red")))
  "highlight tabs")
(font-lock-add-keywords 'tacl-mode '(("\t" 0 tab-face   prepend)))
;;                       ^^^ substitute your mode name here

;; spaces can be highlighted too if you really want.
(defface space-face '((t (:background "grey" )))
  "highlight whitespace")
(font-lock-add-keywords 'tacl-mode '((" "  0 space-face prepend)))
;;                       ^^^ substitute your mode name here

If you only want to see trailing whitespace I use this
(defun stw () "Toggles `show-trailing-whitespace' on/off"
  (interactive)
  (setq show-trailing-whitespace (not show-trailing-whitespace)))

Re: show tabs and white space

[mgrd]

rgb wrote:
> If you want to be able to spot the difference between a tab
> and a space character you could highlight tabs like this.
> 
> (defface tab-face '((t (:background "red")))
>   "highlight tabs")
> (font-lock-add-keywords 'tacl-mode '(("\t" 0 tab-face   prepend)))
> ;;                       ^^^ substitute your mode name here
> 
> ;; spaces can be highlighted too if you really want.
> (defface space-face '((t (:background "grey" )))
>   "highlight whitespace")
> (font-lock-add-keywords 'tacl-mode '((" "  0 space-face prepend)))
> ;;                       ^^^ substitute your mode name here
> 
> If you only want to see trailing whitespace I use this
> (defun stw () "Toggles `show-trailing-whitespace' on/off"
>   (interactive)
>   (setq show-trailing-whitespace (not show-trailing-whitespace)))

Actually I'm looking for a similar minibuffer cmd like the xemacs:
   M-x old-whitespace-mode RET
which highlights both white space and tabs.

Anyway, thanks a lot!

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Re: show tabs and white space

[Miles Bader]

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Try the attached mode, `visible-whitespace-mode'.  It is intended for
the latest CVS Emacs, but may work ok for Emacs 21.

It's somewhat different from typical "highlight whitespace" packages in
that each whitespace character is indicated individually, even when
they're adjacent to each other, which makes it easy to see otherwise
hard to find whitespace problems.

-Miles



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Re: show tabs and white space

[mgrd]

Miles Bader wrote:
> Try the attached mode, `visible-whitespace-mode'.  It is intended for
> the latest CVS Emacs, but may work ok for Emacs 21.
> 
> It's somewhat different from typical "highlight whitespace" packages in
> that each whitespace character is indicated individually, even when
> they're adjacent to each other, which makes it easy to see otherwise
> hard to find whitespace problems.

Thanks a lot Miles.

But I don't have root rights on the machine in question (alpha--netbsd).
So I can't install it in the normal place.
But I'll try to keep it running by placing it somewhere in ~/.emacs.d/

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