bug#23909: 25.1.50; `button-label' must be called in the buffer where the button is in but not mentioned in document

bug#23909: 25.1.50; `button-label' must be called in the buffer where the button is in but not mentioned in document

[Jiajie Chen]

The definition of button-label is:

#+BEGIN_SRC elisp
(defun button-label (button)
  "Return BUTTON's text label."
  (if (button--area-button-p button)
      (substring-no-properties (button--area-button-string button))
    (buffer-substring-no-properties (button-start button)
                                    (button-end button))))
#+END_SRC

So when the function is called in a different buffer, it
returns a wrong result.

One fix would be adding a `with-current-buffer'. Another
would be mentioning that in the document.


In GNU Emacs 25.1.50.1 (x86_64-apple-darwin15.5.0, NS appkit-1404.47 Version 10.11.5 (Build 15F34))
 of 2016-07-03 built on MacBookAirs-MacBook-Air.local
Windowing system distributor 'Apple', version 10.3.1404
Recent messages:
Opening TLS connection with ‘gnutls-cli --x509cafile /usr/local/etc/openssl/cert.pem -p 443 query.yahooapis.com’...done
Opening TLS connection to ‘query.yahooapis.com’...done
Opening TLS connection to ‘query.yahooapis.com’...
Opening TLS connection with ‘gnutls-cli --x509cafile /usr/local/etc/openssl/cert.pem -p 443 query.yahooapis.com’...done
Opening TLS connection to ‘query.yahooapis.com’...done
uncompressing button.el.gz...done
Note: standard-indent, evil-shift-width adjusted to 2
Error while checking syntax automatically: (error "Invalid result type for option: (\"--directory\" nil)")
Mark saved where search started
<wheel-left> is undefined

Configured using:
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Features:
(shadow sort bbdb-message mail-extr emacsbug osx-dictionary image-file
org-eldoc cider-scratch mc-hide-unmatched-lines-mode
mc-separate-operations rectangular-region-mode mc-mark-pop
mc-cycle-cursors mc-edit-lines mc-mark-more org-ref-helm-bibtex
org-ref-ivy-cite org-ref-core org-ref-helm helm-bibtex bibtex-completion
biblio biblio-download biblio-dissemin biblio-hal biblio-dblp
biblio-crossref biblio-arxiv biblio-doi biblio-core helm-config
reftex-cite reftex reftex-loaddefs reftex-vars parsebib org-ref-glossary
org-ref-utils org-ref-pdf org-ref-bibtex doi-utils org-ref-citeproc
key-chord markdown-mode magit-blame magit-stash magit-bisect
magit-remote magit-commit magit-sequence magit magit-apply magit-wip
magit-log magit-diff smerge-mode magit-core magit-autorevert
magit-process magit-popup magit-mode magit-git crm magit-section
magit-utils git-commit log-edit pcvs-util add-log with-editor
async-bytecomp winner make-it-so make-mode mule-diag descr-text
iso-transl debug yahoo-weather elfeed-show shr svg dom elfeed-db
elfeed-search elfeed elfeed-curl url-queue xml-query elfeed-log
elfeed-lib f dash-functional ob-python rng-loc rng-uri rng-parse
rng-match rng-dt rng-util rng-pttrn nxml-parse nxml-ns nxml-enc xmltok
nxml-util ox-md org-clock term disp-table ehelp ox-latex ox-icalendar
ox-html table ox-ascii ox-publish ox geiser ob-octave ebnf2ps ps-print
ps-print-loaddefs ps-def lpr calc calc-loaddefs calc-macs org-rmail
org-mhe org-irc org-info org-gnus org-docview org-bibtex bibtex org-bbdb
org-w3m tabify ox-clip warnings eieio-opt semantic/tag-write
semantic/tag-file semantic/db-file data-debug cedet-files
semantic/bovine/c semantic/decorate/include hideif semantic/bovine/c-by
semantic/lex-spp semantic/bovine/gcc semantic/bovine
semantic/analyze/refs semantic/db-find semantic/db-ref semantic/analyze
semantic/sort semantic/scope semantic/analyze/fcn semantic/idle
semantic/format semantic/ctxt semantic/db-mode semantic/decorate/mode
semantic/tag-ls semantic/find semantic/decorate pulse vc-git diff-mode
semantic/dep irony-cdb-libclang irony-cdb-json irony-cdb-clang-complete
irony-cdb recentf tree-widget helm-imenu helm-easymenu helm-elisp
helm-eval helm-mode helm-files image-dired dired-x dired-aux
helm-buffers helm-tags helm-bookmark helm-locate helm-grep helm-regexp
helm-elscreen helm-adaptive helm-info helm-plugin helm-types
helm-external helm-net helm-utils helm-help helm helm-source
eieio-compat helm-multi-match helm-lib powerline-separators
powerline-themes autoload tar-mode editorconfig-core
editorconfig-core-handle editorconfig-fnmatch colir smex pdf-occur
ibuf-ext ibuffer ibuffer-loaddefs tablist tablist-filter
semantic/wisent/comp semantic/wisent semantic/wisent/wisent pdf-isearch
pdf-misc pdf-tools pdf-view pdf-cache pdf-info tq pdf-util realgud
realgud-zshdb realgud:zshdb-track-mode realgud:zshdb-core
realgud:zshdb-init realgud-trepan3k realgud:trepan3k-track-mode
realgud:trepan3k-core realgud:trepan3k-init realgud-trepan2
realgud:trepan2-track-mode realgud:trepan2-core realgud:trepan2-init
realgud-trepanpl realgud:trepanpl-track-mode realgud:trepanpl-core
realgud:trepanpl-init realgud-trepanjs realgud:trepanjs-track-mode
realgud:trepanjs-core realgud:trepanjs-init realgud-trepan
realgud:trepan-track-mode realgud:trepan-core realgud:trepan-init
realgud-remake realgud:remake-track-mode realgud:remake-core
realgud:remake-init realgud-rdebug realgud-rdebug-track-mode
realgud-rdebug-core realgud-rdebug-init realgud-perldb
realgud:perldb-track-mode realgud:perldb-core realgud:perldb-init
realgud-lang-perl realgud-pdb realgud:pdb-track-mode realgud:pdb-core
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bug#23909: 25.1.50; `button-label' must be called in the buffer where the button is in but not mentioned in document

[Eli Zaretskii]

> From: Jiajie Chen <jiegec@qq.com>
> Date: Thu, 07 Jul 2016 18:19:11 +0800
> 
> The definition of button-label is:
> 
> #+BEGIN_SRC elisp
> (defun button-label (button)
>   "Return BUTTON's text label."
>   (if (button--area-button-p button)
>       (substring-no-properties (button--area-button-string button))
>     (buffer-substring-no-properties (button-start button)
>                                     (button-end button))))
> #+END_SRC
> 
> So when the function is called in a different buffer, it
> returns a wrong result.

AFAICT, all of the functions in button.el operate on buttons in the
current buffer, although only a few mention that explicitly in their
doc strings.  Patches to mention that in the doc strings are welcome.

Thanks.

bug#23909: 25.1.50; `button-label' must be called in the buffer where the button is in but not mentioned in document

[Jiegec]

I have gone through button.el and found only `button-label’ needs
this change. If I have left out some, please add those as well.

This change should be small enough and I needn’t sign.


diff --git a/lisp/button.el b/lisp/button.el
index cb08b78..62a2d0f 100644
--- a/lisp/button.el
+++ b/lisp/button.el
@@ -244,7 +244,8 @@ button-activate
       (funcall action button))))

 (defun button-label (button)
-  "Return BUTTON's text label."
+  "Return BUTTON's text label.
+Only works when BUTTON is in the current buffer."
   (if (button--area-button-p button)
       (substring-no-properties (button--area-button-string button))
     (buffer-substring-no-properties (button-start button)

> On Jul 7, 2016, at 11:24 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Jiajie Chen <jiegec@qq.com>
>> Date: Thu, 07 Jul 2016 18:19:11 +0800
>> 
>> The definition of button-label is:
>> 
>> #+BEGIN_SRC elisp
>> (defun button-label (button)
>>  "Return BUTTON's text label."
>>  (if (button--area-button-p button)
>>      (substring-no-properties (button--area-button-string button))
>>    (buffer-substring-no-properties (button-start button)
>>                                    (button-end button))))
>> #+END_SRC
>> 
>> So when the function is called in a different buffer, it
>> returns a wrong result.
> 
> AFAICT, all of the functions in button.el operate on buttons in the
> current buffer, although only a few mention that explicitly in their
> doc strings.  Patches to mention that in the doc strings are welcome.
> 
> Thanks.
> 
> 
> 
> 

bug#23909: 25.1.50; `button-label' must be called in the buffer where the button is in but not mentioned in document

[Eli Zaretskii]

> From: Jiegec <jiegec@qq.com>
> Date: Fri, 8 Jul 2016 18:36:42 +0800
> Cc: 23909@debbugs.gnu.org
> 
> I have gone through button.el and found only `button-label’ needs
> this change. If I have left out some, please add those as well.

Are we talking about the same issue?  I see these functions work on
the current buffer without telling that in their doc strings:

  button-start, button-end, button-get, button-put, button-activate,
  insert-button, insert-text-button, push-button, forward-button, and
  backward-button

Thanks.

bug#23909: 25.1.50; `button-label' must be called in the buffer where the button is in but not mentioned in document

[Jiegec]

Sorry I wasn’t aware that a button can be just represented by a position.

I think insert-button, insert-text-button, push-button, forward-button and backward-button 
do not need this change. Their names and documentations implies that.

diff --git a/lisp/button.el b/lisp/button.el
index cb08b78..b0a99d3 100644
--- a/lisp/button.el
+++ b/lisp/button.el
@@ -172,7 +172,8 @@ button-type-subtype-p
 ;; Button properties and other attributes

 (defun button-start (button)
-  "Return the position at which BUTTON starts."
+  "Return the position at which BUTTON starts.
+Only works when BUTTON is in the current buffer."
   (if (overlayp button)
       (overlay-start button)
     ;; Must be a text-property button.
@@ -180,7 +181,8 @@ button-start
        (point-min))))

 (defun button-end (button)
-  "Return the position at which BUTTON ends."
+  "Return the position at which BUTTON ends.
+Only works when BUTTON is in the current buffer."
   (if (overlayp button)
       (overlay-end button)
     ;; Must be a text-property button.
@@ -188,7 +190,8 @@ button-end
        (point-max))))

 (defun button-get (button prop)
-  "Get the property of button BUTTON named PROP."
+  "Get the property of button BUTTON named PROP.
+Only works when BUTTON is in the current buffer."
   (cond ((overlayp button)
         (overlay-get button prop))
        ((button--area-button-p button)
@@ -198,7 +201,8 @@ button-get
         (get-text-property button prop))))

 (defun button-put (button prop val)
-  "Set BUTTON's PROP property to VAL."
+  "Set BUTTON's PROP property to VAL.
+Only works when BUTTON is in the current buffer."
   ;; Treat some properties specially.
   (cond ((memq prop '(type :type))
         ;; We translate a `type' property a `category' property, since
@@ -233,7 +237,9 @@ button-activate
 marker then goto it.  Otherwise it it is a function then it is
 called with BUTTON as only argument.  BUTTON is either an
 overlay, a buffer position, or (for buttons in the mode-line or
-header-line) a string."
+header-line) a string.
+
+Only works when BUTTON is in the current buffer."
   (let ((action (or (and use-mouse-action (button-get button 'mouse-action))
                    (button-get button 'action))))
     (if (markerp action)
@@ -244,7 +250,8 @@ button-activate
       (funcall action button))))

 (defun button-label (button)
-  "Return BUTTON's text label."
+  "Return BUTTON's text label.
+Only works when BUTTON is in the current buffer."
   (if (button--area-button-p button)
       (substring-no-properties (button--area-button-string button))
     (buffer-substring-no-properties (button-start button)
d

> On Jul 8, 2016, at 9:48 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Jiegec <jiegec@qq.com>
>> Date: Fri, 8 Jul 2016 18:36:42 +0800
>> Cc: 23909@debbugs.gnu.org
>> 
>> I have gone through button.el and found only `button-label’ needs
>> this change. If I have left out some, please add those as well.
> 
> Are we talking about the same issue?  I see these functions work on
> the current buffer without telling that in their doc strings:
> 
>  button-start, button-end, button-get, button-put, button-activate,
>  insert-button, insert-text-button, push-button, forward-button, and
>  backward-button
> 
> Thanks.
> 
> 
> 
> 

bug#23909: 25.1.50; `button-label' must be called in the buffer where the button is in but not mentioned in document

[Eli Zaretskii]

> From: Jiegec <jiegec@qq.com>
> Date: Fri, 8 Jul 2016 22:01:40 +0800
> Cc: 23909@debbugs.gnu.org
> 
> Sorry I wasn’t aware that a button can be just represented by a position.
> 
> I think insert-button, insert-text-button, push-button, forward-button and backward-button 
> do not need this change. Their names and documentations implies that.

OK, thanks.  Can you send a full patch, together with ChangeLog-style
commit log messages for these changes?  I will then push them in your
name.

bug#23909: 25.1.50; `button-label' must be called in the buffer where the button is in but not mentioned in document

[Lars Ingebrigtsen]

Jiegec <jiegec@qq.com> writes:

> Sorry I wasn’t aware that a button can be just represented by a position.
>
> I think insert-button, insert-text-button, push-button, forward-button and backward-button 
> do not need this change. Their names and documentations implies that.

Thanks; applied to Emacs 27.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no