Re: Matching labels with buttons

[Stephen Berman]

On Mon, 15 Jul 2024 21:29:38 +0000 Heime <heimeborgia@protonmail.com> wrote:

> On Tuesday, July 16th, 2024 at 9:20 AM, Stephen Berman
> <stephen.berman@gmx.net> wrote:
>
>> On Mon, 15 Jul 2024 17:25:42 +0000 Heime heimeborgia@protonmail.com wrote:
>>
>> > On Tuesday, July 16th, 2024 at 4:24 AM, Heime heimeborgia@protonmail.com 
>> > wrote:
[...]
>> > > I also have to handle the case of " LABEL [-] " with a different regex,
>> > > so I can
>> > > distinguish between " [-] LABEL " and " LABEL [-] ".
>> >
>> > In the latter case I want to match [-] at the end with any trailing spaces.
>>
>>
>> With your original code amended by anchoring the first regexp as I
>> suggested, I think it handles both cases you want; at least the brief
>> tests I tried worked. If you don't get the results you want, please
>> show the complete code you're using and examples where it fails.
>>
>> Steve Berman
>
> Have used
>
> "\\`\\(\\s-*\\[\\-\\]\\s-*\\)\\(.*\\)"  for " [-] LABEL "
>
> and
>
> "\\(.*\\)\\(\\s-*\\[\\-\\]\\s-*\\)\\'"  for " LABEL [-] "

Since you didn't do what I requested, I've done it.  Evaluate the
following code, which is based on your original code amended as I
suggested (I didn't use "\\'" in the second regexp, but the results are
the same with and without it):

(defun heime-button (label)
  (if (string-match "\\`\\(\\s-*\\[\\-\\]\\s-*\\)\\(.*\\)" label) ; [-] LB
      (progn
        (setq bt (match-string 1 label))
        (setq lb (match-string 2 label))
        (setq result
              (concat bt (propertize lb 'face '(:foreground "red")))))
    (when (string-match "\\(.*\\)\\(\\s-*\\[\\-\\]\\s-*\\)" label) ; LB [-]
      (setq lb (match-string 1 label))
      (setq bt (match-string 2 label))
      (setq result
            (concat (propertize lb 'face '(:foreground "red")) bt))))
  (insert result))

(with-current-buffer (get-buffer-create "*Heime Test*")
  (erase-buffer)
  (heime-button " [-] LABEL ")
  (newline)
  (heime-button " LABEL [-] "))

(switch-to-buffer "*Heime Test*")

What I see in buffer *Heime Test* is this:

 [-] LABEL
 LABEL [-]

where each string "LABEL" is red.  Is this not what you want?

Steve Berman