Subject: bug#50383: 28.0.50; [PATCH] Feature suggestion, gnus-article-toggle-fonts to toggle fonts for HTML articles

From: Alex Bochannek <[email-masked]>
Date: Mon, 06 Sep 2021 15:41:25 -0700

Lars Ingebrigtsen <[email-masked]> writes:

> Alex Bochannek <[email-masked]> writes:
>
>> Just like this then?
>
> Yup, if that does indeed work.  :-)
>
>> +  ;; Shadow global shr-use-fonts to support font toggling.
>> +  (setq-local shr-use-fonts shr-use-fonts)
>
> But perhaps this should be set only if the user uses this command.  Can
> you respin the entire patch and we'll get it applied...

I thought about it some more and I don't think it's necessary at all to
initialize the local variable, because it will happen automatically the
first time the command is used. The below should be enough. I tested it
a bit and it works for me.

	New Gnus article washing function to toggle HTML fonts

	* lisp/gnus/gnus-sum.el (gnus-summary-wash-display-map),
	(gnus-summary-make-menu-bar): Add mode mapping and menu item for
	article HTML font toggle.

	* lisp/gnus/gnus-art.el (gnus-article-toggle-fonts): Toggle
	shr-use-fonts and redisplay message.

	* doc/misc/gnus.texi (Article Washing): Document new HTML font
	toggle function.

Thanks!
diff --git a/doc/misc/gnus.texi b/doc/misc/gnus.texi
index 5f3fba00df..c8aec4eea1 100644
--- a/doc/misc/gnus.texi
+++ b/doc/misc/gnus.texi
@@ -9374,6 +9374,12 @@ Article Washing
 
 @end table
 
+@item W D F
+@kindex W D F @r{(Summary)}
+@findex gnus-article-toggle-fonts
+Toggle proportional fonts for @acronym{HTML} articles.  This temporarily
+changes the @code{shr-use-fonts} variable in the current buffer.
+
 @item W b
 @kindex W b @r{(Summary)}
 @findex gnus-article-add-buttons
diff --git a/lisp/gnus/gnus-art.el b/lisp/gnus/gnus-art.el
index 3c1403e155..a962b06372 100644
--- a/lisp/gnus/gnus-art.el
+++ b/lisp/gnus/gnus-art.el
@@ -2243,6 +2243,15 @@ gnus-article-show-images
 	    (funcall function (get-text-property start 'image-url)
 		     start end)))))))
 
+(defun gnus-article-toggle-fonts ()
+  "Toggle the use of proportional fonts for HTML articles."
+  (interactive nil gnus-article-mode gnus-summary-mode)
+  (gnus-with-article-buffer
+    (if (eq mm-text-html-renderer 'shr)
+        (progn
+          (setq-local shr-use-fonts (not shr-use-fonts))
+          (gnus-summary-show-article)))))
+
 (defun gnus-article-treat-fold-newsgroups ()
   "Fold the Newsgroups and Followup-To message headers."
   (interactive nil gnus-article-mode gnus-summary-mode)
diff --git a/lisp/gnus/gnus-sum.el b/lisp/gnus/gnus-sum.el
index 856e95c0ba..c28e38e315 100644
--- a/lisp/gnus/gnus-sum.el
+++ b/lisp/gnus/gnus-sum.el
@@ -2252,6 +2252,7 @@ gnus-summary-mode-map
   "s" gnus-treat-smiley
   "D" gnus-article-remove-images
   "W" gnus-article-show-images
+  "F" gnus-article-toggle-fonts
   "f" gnus-treat-from-picon
   "m" gnus-treat-mail-picon
   "n" gnus-treat-newsgroups-picon
@@ -2561,6 +2562,7 @@ gnus-summary-make-menu-bar
 	      ["Unfold headers" gnus-article-treat-unfold-headers t]
 	      ["Fold newsgroups" gnus-article-treat-fold-newsgroups t]
 	      ["Html" gnus-article-wash-html t]
+	      ["Toggle HTML fonts" gnus-article-toggle-fonts t]
 	      ["Unsplit URLs" gnus-article-unsplit-urls t]
 	      ["Verify X-PGP-Sig" gnus-article-verify-x-pgp-sig t]
 	      ["Decode HZ" gnus-article-decode-HZ t]
-- 
Alex.