GNU bug report logs - #21895
25.0.50; eww: Lisp error: (void-function fringe-columns)

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Eric Hanchrow <eric.hanchrow <at> gmail.com>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: 25.0.50; eww: Lisp error: (void-function fringe-columns)
Date: Fri, 13 Nov 2015 00:06:07 +0000

[Message part 1 (text/plain, inline)]

I started emacs with -Q, typed M-x eww RET http://google.com RET, and saw
the error.  I then did M-x toggle-debug-on-error RET, and hit "g" to reload
the page, in order to get the below stack trace:

Debugger entered--Lisp error: (void-function fringe-columns)
  fringe-columns(right)
  shr-insert-document((base ((href . "http://www.google.com/")) (html
((itemscope . "") (itemtype . "http://schema.org/WebPage") (lang . "en"))
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"/images/branding/googleg/1x/googleg_standard_color_128dp.png") (itemprop .
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Rye{\345I")

In GNU Emacs 25.0.50.3 (x86_64-unknown-linux-gnu)
 of 2015-11-10
Repository revision: 3c3aad733522365a8fe729d7c92e64e98bc4ce92
Configured using:
 'configure --without-x'

Configured features:
SOUND NOTIFY LIBSELINUX LIBXML2 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

[Message part 2 (text/html, inline)]

Message #8 received at 21895 <at> debbugs.gnu.org (full text, mbox):

From: Eric Hanchrow <eric.hanchrow <at> gmail.com>
To: 21895 <at> debbugs.gnu.org
Subject: easy workaround
Date: Fri, 13 Nov 2015 00:17:29 +0000

[Message part 1 (text/plain, inline)]

twb points out that I can (require 'fringe) to make the problem go away.

[Message part 2 (text/html, inline)]

Message #11 received at 21895 <at> debbugs.gnu.org (full text, mbox):

From: Eric Hanchrow <eric.hanchrow <at> gmail.com>
To: 21895 <at> debbugs.gnu.org
Subject: [PATCH] shr: don't invoke unbound function (Bug#21895)
Date: Fri, 13 Nov 2015 01:29:33 +0000

[Message part 1 (text/plain, inline)]

* lisp/net/shr.el (fringes-p):
New function.
(shr-insert-document, shr-fill-text): Use it.
---
 lisp/net/shr.el | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/lisp/net/shr.el b/lisp/net/shr.el
index 58deaea..853b2fd 100644
--- a/lisp/net/shr.el
+++ b/lisp/net/shr.el
@@ -203,6 +203,12 @@ cid: URL as the argument.")
       (goto-char begin)
       (shr-insert-document dom))))

+(defun fringes-p ()
+  "Return t if fringe-columns is bound, and either (fringe-columns 'left)
or (fringe-columns 'right) returns nonzero."
+  (and (fboundp 'fringe-columns)
+       (or (not (zerop (fringe-columns 'right)))
+           (not (zerop (fringe-columns 'left))))))
+
 ;;;###autoload
 (defun shr-insert-document (dom)
   "Render the parsed document DOM into the current buffer.
@@ -230,19 +236,13 @@ DOM should be a parse tree as generated by
  (if (not shr-use-fonts)
     (- (window-body-width) 1
                                        (if (and (null shr-width)
-                                                (or (zerop
-                                                     (fringe-columns
'right))
-                                                    (zerop
-                                                     (fringe-columns
'left))))
+                                                (not (fringes-p)))
                                            0
                                          1))
   (- (window-body-width nil t)
                                      (* 2 (frame-char-width))
                                      (if (and (null shr-width)
-                                              (or (zerop
-                                                   (fringe-columns 'right))
-                                                  (zerop
-                                                   (fringe-columns
'left))))
+                                              (not (fringes-p)))
                                          (* (frame-char-width) 2)
                                        0))))))
     (shr-descend dom)
@@ -466,8 +466,7 @@ size, and full-buffer size."
                                    ;; to usurp one column for the
                                    ;; continuation glyph.
                                    (if (and (null shr-width)
-                                            (or (zerop (fringe-columns
'right))
-                                                (zerop (fringe-columns
'left))))
+                                            (not (fringes-p)))
                                        (* (frame-char-width) 2)
                                      0))))
  (shr-insert text)
-- 
2.6.3


On Thu, Nov 12, 2015 at 4:17 PM Eric Hanchrow <eric.hanchrow <at> gmail.com>
wrote:

> twb points out that I can (require 'fringe) to make the problem go away.
>

[Message part 2 (text/html, inline)]

Message #14 received at 21895 <at> debbugs.gnu.org (full text, mbox):

From: Eric Hanchrow <eric.hanchrow <at> gmail.com>
To: 21895 <at> debbugs.gnu.org
Subject: Re: [PATCH] shr: don't invoke unbound function (Bug#21895)
Date: Fri, 13 Nov 2015 01:35:47 +0000

[Message part 1 (text/plain, inline)]

Again, but as an attachment.

On Thu, Nov 12, 2015 at 5:29 PM Eric Hanchrow <eric.hanchrow <at> gmail.com>
wrote:

> * lisp/net/shr.el (fringes-p):
> New function.
> (shr-insert-document, shr-fill-text): Use it.
> ---
>  lisp/net/shr.el | 19 +++++++++----------
>  1 file changed, 9 insertions(+), 10 deletions(-)
>
> diff --git a/lisp/net/shr.el b/lisp/net/shr.el
> index 58deaea..853b2fd 100644
> --- a/lisp/net/shr.el
> +++ b/lisp/net/shr.el
> @@ -203,6 +203,12 @@ cid: URL as the argument.")
>        (goto-char begin)
>        (shr-insert-document dom))))
>
> +(defun fringes-p ()
> +  "Return t if fringe-columns is bound, and either (fringe-columns 'left)
> or (fringe-columns 'right) returns nonzero."
> +  (and (fboundp 'fringe-columns)
> +       (or (not (zerop (fringe-columns 'right)))
> +           (not (zerop (fringe-columns 'left))))))
> +
>  ;;;###autoload
>  (defun shr-insert-document (dom)
>    "Render the parsed document DOM into the current buffer.
> @@ -230,19 +236,13 @@ DOM should be a parse tree as generated by
>   (if (not shr-use-fonts)
>      (- (window-body-width) 1
>                                         (if (and (null shr-width)
> -                                                (or (zerop
> -                                                     (fringe-columns
> 'right))
> -                                                    (zerop
> -                                                     (fringe-columns
> 'left))))
> +                                                (not (fringes-p)))
>                                             0
>                                           1))
>    (- (window-body-width nil t)
>                                       (* 2 (frame-char-width))
>                                       (if (and (null shr-width)
> -                                              (or (zerop
> -                                                   (fringe-columns
> 'right))
> -                                                  (zerop
> -                                                   (fringe-columns
> 'left))))
> +                                              (not (fringes-p)))
>                                           (* (frame-char-width) 2)
>                                         0))))))
>      (shr-descend dom)
> @@ -466,8 +466,7 @@ size, and full-buffer size."
>                                     ;; to usurp one column for the
>                                     ;; continuation glyph.
>                                     (if (and (null shr-width)
> -                                            (or (zerop (fringe-columns
> 'right))
> -                                                (zerop (fringe-columns
> 'left))))
> +                                            (not (fringes-p)))
>                                         (* (frame-char-width) 2)
>                                       0))))
>   (shr-insert text)
> --
> 2.6.3
>
>
> On Thu, Nov 12, 2015 at 4:17 PM Eric Hanchrow <eric.hanchrow <at> gmail.com>
> wrote:
>
>> twb points out that I can (require 'fringe) to make the problem go away.
>>
>

[Message part 2 (text/html, inline)]

[0001-shr-don-t-invoke-unbound-function-Bug-21895.patch (application/octet-stream, attachment)]

Message #19 received at 21895-done <at> debbugs.gnu.org (full text, mbox):

From: "John Wiegley" <jwiegley <at> gmail.com>
To: Eric Hanchrow <eric.hanchrow <at> gmail.com>
Cc: 21895-done <at> debbugs.gnu.org
Subject: Re: bug#21895: [PATCH] shr: don't invoke unbound function (Bug#21895)
Date: Thu, 12 Nov 2015 17:48:18 -0800

>>>>> Eric Hanchrow <eric.hanchrow <at> gmail.com> writes:

> Again, but as an attachment.

Thanks, applied!

John

Message #22 received at 21895 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Eric Hanchrow <eric.hanchrow <at> gmail.com>
Cc: 21895 <at> debbugs.gnu.org
Subject: Re: bug#21895: [PATCH] shr: don't invoke unbound function (Bug#21895)
Date: Thu, 12 Nov 2015 22:16:17 -0500

Eric Hanchrow wrote:

> * lisp/net/shr.el (fringes-p):

That should have a shr- prefix, probably shr--.

Message #25 received at 21895 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Eric Hanchrow <eric.hanchrow <at> gmail.com>
Cc: 21895 <at> debbugs.gnu.org
Subject: Re: bug#21895: [PATCH] shr: don't invoke unbound function (Bug#21895)
Date: Thu, 12 Nov 2015 22:24:11 -0500

Also first line of doc should be a complete sentence.
Also doc basically just reiterates the code.
Something like "Return non-nil if there's a fringe." would be more typical.

Message #28 received at 21895 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Eric Hanchrow <eric.hanchrow <at> gmail.com>, 21895 <at> debbugs.gnu.org
Subject: Re: bug#21895: [PATCH] shr: don't invoke unbound function (Bug#21895)
Date: Fri, 13 Nov 2015 09:04:37 +0100

> +(defun fringes-p ()
> +  "Return t if fringe-columns is bound, and either (fringe-columns 'left)
> or (fringe-columns 'right) returns nonzero."
> +  (and (fboundp 'fringe-columns)
> +       (or (not (zerop (fringe-columns 'right)))
> +           (not (zerop (fringe-columns 'left))))))
> +

This is wrong when ‘fringe-columns’ is unbound and a fringe is present.
The right solution is to

(require 'fringe)

in ‘shr-mode’ as you proposed earlier.

martin

Message #31 received at 21895 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: martin rudalics <rudalics <at> gmx.at>
Cc: 21895 <at> debbugs.gnu.org, eric.hanchrow <at> gmail.com
Subject: Re: bug#21895: [PATCH] shr: don't invoke unbound function (Bug#21895)
Date: Fri, 13 Nov 2015 10:23:17 +0200

> Date: Fri, 13 Nov 2015 09:04:37 +0100
> From: martin rudalics <rudalics <at> gmx.at>
> 
>  > +(defun fringes-p ()
>  > +  "Return t if fringe-columns is bound, and either (fringe-columns 'left)
>  > or (fringe-columns 'right) returns nonzero."
>  > +  (and (fboundp 'fringe-columns)
>  > +       (or (not (zerop (fringe-columns 'right)))
>  > +           (not (zerop (fringe-columns 'left))))))
>  > +
> 
> This is wrong when ‘fringe-columns’ is unbound and a fringe is present.

Why would that happen?  fringe.el is preloaded when GUI frames are
supported, and if not, there are no fringes.  What am I missing?

> The right solution is to
> 
> (require 'fringe)
> 
> in ‘shr-mode’ as you proposed earlier.

What if the user doesn't want fringes in her sessions?

Message #34 received at 21895 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 21895 <at> debbugs.gnu.org, eric.hanchrow <at> gmail.com
Subject: Re: bug#21895: [PATCH] shr: don't invoke unbound function (Bug#21895)
Date: Fri, 13 Nov 2015 11:24:52 +0200

> From: Glenn Morris <rgm <at> gnu.org>
> Date: Thu, 12 Nov 2015 22:16:17 -0500
> Cc: 21895 <at> debbugs.gnu.org
> 
> Eric Hanchrow wrote:
> 
> > * lisp/net/shr.el (fringes-p):
> 
> That should have a shr- prefix, probably shr--.

Fixed.

> Also first line of doc should be a complete sentence.
> Also doc basically just reiterates the code.
> Something like "Return non-nil if there's a fringe." would be more typical.

Fixed.

Thanks.

Message #37 received at 21895 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 21895 <at> debbugs.gnu.org, eric.hanchrow <at> gmail.com
Subject: Re: bug#21895: [PATCH] shr: don't invoke unbound function (Bug#21895)
Date: Fri, 13 Nov 2015 11:01:00 +0100

>> This is wrong when ‘fringe-columns’ is unbound and a fringe is present.
>
> Why would that happen?  fringe.el is preloaded when GUI frames are
> supported, and if not, there are no fringes.  What am I missing?

Nothing.  You are right and I was wrong.

martin

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