display zero with space U+200B

display zero with space U+200B

[Florian Kaufmann]

I have a file containing zero with space characters (unicode code
point U+200B). Any idea how I can get a visual feedback where they
are? I tried to customize whitespace-display-mappings of whitespace.el
like this:

(defcustom whitespace-display-mappings '( (space-mark ?\x200B [?\xB7]
[?.]) ...

But I still don't see it. Normal spaces are displayed as intented by
whitespace.el.

Re: display zero with space U+200B

[Florian Kaufmann]

of course I meant zero width space

Re: display zero with space U+200B

[Pascal J. Bourguignon]

Florian Kaufmann <sensorflo@gmail.com> writes:

> I have a file containing zero with space characters (unicode code
> point U+200B). Any idea how I can get a visual feedback where they
> are? I tried to customize whitespace-display-mappings of whitespace.el
> like this:
>
> (defcustom whitespace-display-mappings '( (space-mark ?\x200B [?\xB7]
> [?.]) ...
>
> But I still don't see it. Normal spaces are displayed as intented by
> whitespace.el.

My advice would be to delete them from the file.


Since they have a null width, you cannot see them, obviously.
But you could show the characters that are around them.

(let ((zws ?\u200b))
  (re-search-forward (format "\\(^%c.\\|.%c.\\|.%c$\\|^%c$\\)" zws zws zws zws)))



Another way to do it would involve compose-region:

(font-lock-add-keywords nil
  `((,(format "\\(%c\\)" ?\u200b) ; #\ZERO_WIDTH_SPACE
     (1 (progn (compose-region (match-beginning 1) (match-end 1)
                               ?\u2b1b ; #\BLACK_LARGE_SQUARE
                               'decompose-region)
                nil)))))


-- 
__Pascal Bourguignon__                     http://www.informatimago.com/