GNU bug report logs - #51712
29.0.50; [PATCH] New function `xwidget-webkit-load-html'

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Package: emacs; Severity: wishlist; Reported by: Po Lu <luangruo@HIDDEN>; Keywords: patch; dated Tue, 9 Nov 2021 10:27:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Date: Wed, 10 Nov 2021 14:50:28 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: Po Lu <luangruo@HIDDEN>
In-Reply-To: <87zgqcczk4.fsf@HIDDEN> (message from Po Lu on Wed, 10 Nov
 2021 14:08:59 +0800)
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
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> From: Po Lu <luangruo@HIDDEN>
> Cc: Eli Zaretskii <eliz@HIDDEN>,  51712 <at> debbugs.gnu.org
> Date: Wed, 10 Nov 2021 14:08:59 +0800
> 
> > That should be \"about:blank\" instead, since it's a string and not a
> > symbol.
> 
> Thanks, how's this?  Eli, does this look good to you?

Almost:

> +@defun xwidget-webkit-load-html xwidget text &optional base-uri
> +Load @var{text}, a string, into @var{xwidget}, which should be a
> +WebKit xwidget.  It treats @var{text} as HTML markup, which will be
> +rendered by @var{xwidget}.

Instead of the last sentence:

  Any HTML markup in @var{text} will be processed by @var{xwidget}
  while rendering the text.

> +Optional argument @var{base-uri}, which should be a string, specifies
> +the location of web resources specified through relative links, such
> +as the resource @samp{foo.png} in the HTML tag @samp{<img
> +src="foo.png">}.  It defaults to @samp{about:blank}.
> +@end defun

  Optional argument @var{base-uri}, which should be a string,
  specifies the absolute location of the web resources referenced by
  @var{text}, to be used for resolving relative links in @var{text}.

> +*** New function 'xwidget-webkit-load-html'.
> +This function is used to load HTML text into WebKit xwidgets, without
> +having to create a temporary file to store the markup.

Here' I'd like to say something like

  This is in contrast with loading HTML using ... which requires to
  create temporary files for storing the markup.

But I don't know what to write instead of "...".  What was the method
which existed earlier that you wanted to improve?

> +BASE_URI should be a string containing a URI that is used to locate
> +resources described by relative URLs, and if not specified, defaults
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
"resources with relative URLs" sounds better to me.

Thanks.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#51712; Package emacs. Full text available.

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From: Po Lu <luangruo@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
 <83h7cl5urs.fsf@HIDDEN> <87y25x5tu9.fsf@HIDDEN>
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 <877ddgluzr.fsf@HIDDEN> <87fss4ohjv.fsf@HIDDEN>
 <87sfw4h7pt.fsf@HIDDEN>
Date: Wed, 10 Nov 2021 14:08:59 +0800
In-Reply-To: <87sfw4h7pt.fsf@HIDDEN> (Lars Ingebrigtsen's message of "Wed,
 10 Nov 2021 06:59:10 +0100")
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--=-=-=
Content-Type: text/plain

Lars Ingebrigtsen <larsi@HIDDEN> writes:

> That should be \"about:blank\" instead, since it's a string and not a
> symbol.

Thanks, how's this?  Eli, does this look good to you?


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Add-xwidget-webkit-load-html.patch

From 1d701339df5ed91ed730fb134976137bcf1e0ce6 Mon Sep 17 00:00:00 2001
From: Po Lu <luangruo@HIDDEN>
Date: Tue, 9 Nov 2021 21:36:40 +0800
Subject: [PATCH] Add `xwidget-webkit-load-html'

* doc/lispref/display.texi (Xwidgets): Document new function.
* etc/NEWS: Announce new function.
* src/xwidget.c (Fxwidget_webkit_load_html): New function.
(syms_of_xwidget): Define new subr.
---
 doc/lispref/display.texi | 11 +++++++++++
 etc/NEWS                 |  5 +++++
 src/xwidget.c            | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index b6bd14f887..aa7d64493c 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -6943,6 +6943,17 @@ Xwidgets
 signals an error.
 @end defun
 
+@defun xwidget-webkit-load-html xwidget text &optional base-uri
+Load @var{text}, a string, into @var{xwidget}, which should be a
+WebKit xwidget.  It treats @var{text} as HTML markup, which will be
+rendered by @var{xwidget}.
+
+Optional argument @var{base-uri}, which should be a string, specifies
+the location of web resources specified through relative links, such
+as the resource @samp{foo.png} in the HTML tag @samp{<img
+src="foo.png">}.  It defaults to @samp{about:blank}.
+@end defun
+
 @node Buttons
 @section Buttons
 @cindex buttons in buffers
diff --git a/etc/NEWS b/etc/NEWS
index 3cad0995ac..ae318be1c0 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -796,6 +796,11 @@ what the widget will actually receive.
 
 On GTK+, only key and function key events are implemented.
 
++++
+*** New function 'xwidget-webkit-load-html'.
+This function is used to load HTML text into WebKit xwidgets, without
+having to create a temporary file to store the markup.
+
 +++
 *** New functions for performing searches on WebKit xwidgets.
 Some new functions, such as 'xwidget-webkit-search', have been added
diff --git a/src/xwidget.c b/src/xwidget.c
index fc76ce307e..2587b658e7 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -2139,6 +2139,44 @@ DEFUN ("xwidget-webkit-finish-search", Fxwidget_webkit_finish_search,
   return Qnil;
 }
 
+#ifdef USE_GTK
+DEFUN ("xwidget-webkit-load-html", Fxwidget_webkit_load_html,
+       Sxwidget_webkit_load_html, 2, 3, 0,
+       doc: /* Make XWIDGET's WebKit widget render TEXT.
+XWIDGET should be a WebKit xwidget, that will receive TEXT.  TEXT
+should be a string that will be displayed by XWIDGET as HTML markup.
+BASE_URI should be a string containing a URI that is used to locate
+resources described by relative URLs, and if not specified, defaults
+to "about:blank".  */)
+  (Lisp_Object xwidget, Lisp_Object text, Lisp_Object base_uri)
+{
+  struct xwidget *xw;
+  WebKitWebView *webview;
+  char *data, *uri;
+
+  CHECK_XWIDGET (xwidget);
+  CHECK_STRING (text);
+  if (NILP (base_uri))
+    base_uri = build_string ("about:blank");
+  else
+    CHECK_STRING (base_uri);
+
+  base_uri = ENCODE_UTF_8 (base_uri);
+  text = ENCODE_UTF_8 (text);
+  xw = XXWIDGET (xwidget);
+
+  data = SSDATA (text);
+  uri = SSDATA (base_uri);
+  webview = WEBKIT_WEB_VIEW (xw->widget_osr);
+
+  block_input ();
+  webkit_web_view_load_html (webview, data, uri);
+  unblock_input ();
+
+  return Qnil;
+}
+#endif
+
 void
 syms_of_xwidget (void)
 {
@@ -2177,6 +2214,9 @@ syms_of_xwidget (void)
   defsubr (&Sxwidget_webkit_next_result);
   defsubr (&Sxwidget_webkit_previous_result);
   defsubr (&Sset_xwidget_buffer);
+#ifdef USE_GTK
+  defsubr (&Sxwidget_webkit_load_html);
+#endif
 
   DEFSYM (QCxwidget, ":xwidget");
   DEFSYM (QCtitle, ":title");
-- 
2.31.1


--=-=-=--

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bug#51712; Package emacs. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Po Lu <luangruo@HIDDEN>
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
 <83h7cl5urs.fsf@HIDDEN> <87y25x5tu9.fsf@HIDDEN>
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X-Now-Playing: Kate Bush's _Remastered (16): The Other Sides (2): The Other
 Side 1_: "Running Up That Hill (A Deal With God) 2012 Remix"
Date: Wed, 10 Nov 2021 06:59:10 +0100
In-Reply-To: <87fss4ohjv.fsf@HIDDEN> (Po Lu's message of "Wed, 10 Nov 2021
 10:44:52 +0800")
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 Content preview:  Po Lu <luangruo@HIDDEN> writes: > Hmm, OK, how's this?
 Looks good to me. One tiny thing: 
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Po Lu <luangruo@HIDDEN> writes:

> Hmm, OK, how's this?

Looks good to me.  One tiny thing:

> +BASE_URI should be a string containing a URI that is used to locate
> +resources described by relative URLs, and if not specified, defaults
> +to `about:blank'.  */)

That should be \"about:blank\" instead, since it's a string and not a
symbol.

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

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#51712; Package emacs. Full text available.

Message received at 51712 <at> debbugs.gnu.org:

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From: Po Lu <luangruo@HIDDEN>
To: Richard Stallman <rms@HIDDEN>
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
 <E1mkfK7-0006Mh-Cl@HIDDEN>
Date: Wed, 10 Nov 2021 12:47:40 +0800
In-Reply-To: <E1mkfK7-0006Mh-Cl@HIDDEN> (Richard Stallman's message
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Richard Stallman <rms@HIDDEN> writes:

> Would you please explain the role of JavaScript code in use of xwidget?
> In particular, will this JavaScript code be written specifically for
> use with Emacs?  Or will it be found on the net?

It will be JavaScript code written specifically for use with Emacs, used
to manipulate the DOM tree of the widget.

Thanks.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#51712; Package emacs. Full text available.

Message received at 51712 <at> debbugs.gnu.org:

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Richard Stallman <rms@HIDDEN>
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
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X-Now-Playing: Kate Bush's _Remastered (9): Aerial: A Sky of Honey_: "Nocturn"
Date: Wed, 10 Nov 2021 05:37:39 +0100
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 Content preview:  Richard Stallman <rms@HIDDEN> writes: > Would you please
 explain the role of JavaScript code in use of xwidget? > In particular, will
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 it be found on the net? 
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Richard Stallman <rms@HIDDEN> writes:

> Would you please explain the role of JavaScript code in use of xwidget?
> In particular, will this JavaScript code be written specifically for
> use with Emacs?  Or will it be found on the net?

It's JS written by me included in Emacs.

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

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#51712; Package emacs. Full text available.

Message received at 51712 <at> debbugs.gnu.org:

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From: Richard Stallman <rms@HIDDEN>
To: Po Lu <luangruo@HIDDEN>
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Subject: Re: bug#51712: 29.0.50;
 [PATCH] New function `xwidget-webkit-load-html'
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[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

  > Hopefully this allows to reduce the amount of JavaScript hacks needed to
  > load HTML into a widget.

Would you please explain the role of JavaScript code in use of xwidget?
In particular, will this JavaScript code be written specifically for
use with Emacs?  Or will it be found on the net?

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#51712; Package emacs. Full text available.

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From: Po Lu <luangruo@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
 <83h7cl5urs.fsf@HIDDEN> <87y25x5tu9.fsf@HIDDEN>
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 <87r1bolvx1.fsf@HIDDEN> <87czn8yii2.fsf@HIDDEN>
 <877ddgluzr.fsf@HIDDEN>
Date: Wed, 10 Nov 2021 10:44:52 +0800
In-Reply-To: <877ddgluzr.fsf@HIDDEN> (Lars Ingebrigtsen's message of "Wed,
 10 Nov 2021 01:22:48 +0100")
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--=-=-=
Content-Type: text/plain

Lars Ingebrigtsen <larsi@HIDDEN> writes:

> Po Lu <luangruo@HIDDEN> writes:
>
>> Thanks, does this look OK to you?  And I'm afraid I'm not terribly good
>> at phrasing this into words, so I would really appreciate it if you
>> could help write that section of the manual.
>
> [...]
>
>> +Optional argument @var{base-uri}, which should be a string, specifies
>> +the location of web resources specified through relative links, such
>> +as the resource @samp{foo.png} in the HTML tag @samp{<img
>> +src="foo.png">}.  It defaults to @samp{about:blank}.
>
> Looks good to me.
>
>> +XWIDGET should be a WebKit xwidget, that will receive TEXT.  TEXT
>> +should be a string that will be displayed by XWIDGET as HTML markup.
>> +BASE_URI should be a string containing a URI that is used to fetch
>> +resources, and if not specified, defaults to `about:blank'.  */)
>
> Should probably be "relative resources (i.e., URLs that aren't
> absolute)" or something of the kind.

Hmm, OK, how's this?


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Add-xwidget-webkit-load-html.patch

From 1d701339df5ed91ed730fb134976137bcf1e0ce6 Mon Sep 17 00:00:00 2001
From: Po Lu <luangruo@HIDDEN>
Date: Tue, 9 Nov 2021 21:36:40 +0800
Subject: [PATCH] Add `xwidget-webkit-load-html'

* doc/lispref/display.texi (Xwidgets): Document new function.
* etc/NEWS: Announce new function.
* src/xwidget.c (Fxwidget_webkit_load_html): New function.
(syms_of_xwidget): Define new subr.
---
 doc/lispref/display.texi | 11 +++++++++++
 etc/NEWS                 |  5 +++++
 src/xwidget.c            | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index b6bd14f887..aa7d64493c 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -6943,6 +6943,17 @@ Xwidgets
 signals an error.
 @end defun
 
+@defun xwidget-webkit-load-html xwidget text &optional base-uri
+Load @var{text}, a string, into @var{xwidget}, which should be a
+WebKit xwidget.  It treats @var{text} as HTML markup, which will be
+rendered by @var{xwidget}.
+
+Optional argument @var{base-uri}, which should be a string, specifies
+the location of web resources specified through relative links, such
+as the resource @samp{foo.png} in the HTML tag @samp{<img
+src="foo.png">}.  It defaults to @samp{about:blank}.
+@end defun
+
 @node Buttons
 @section Buttons
 @cindex buttons in buffers
diff --git a/etc/NEWS b/etc/NEWS
index 3cad0995ac..ae318be1c0 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -796,6 +796,11 @@ what the widget will actually receive.
 
 On GTK+, only key and function key events are implemented.
 
++++
+*** New function 'xwidget-webkit-load-html'.
+This function is used to load HTML text into WebKit xwidgets, without
+having to create a temporary file to store the markup.
+
 +++
 *** New functions for performing searches on WebKit xwidgets.
 Some new functions, such as 'xwidget-webkit-search', have been added
diff --git a/src/xwidget.c b/src/xwidget.c
index fc76ce307e..2587b658e7 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -2139,6 +2139,44 @@ DEFUN ("xwidget-webkit-finish-search", Fxwidget_webkit_finish_search,
   return Qnil;
 }
 
+#ifdef USE_GTK
+DEFUN ("xwidget-webkit-load-html", Fxwidget_webkit_load_html,
+       Sxwidget_webkit_load_html, 2, 3, 0,
+       doc: /* Make XWIDGET's WebKit widget render TEXT.
+XWIDGET should be a WebKit xwidget, that will receive TEXT.  TEXT
+should be a string that will be displayed by XWIDGET as HTML markup.
+BASE_URI should be a string containing a URI that is used to locate
+resources described by relative URLs, and if not specified, defaults
+to `about:blank'.  */)
+  (Lisp_Object xwidget, Lisp_Object text, Lisp_Object base_uri)
+{
+  struct xwidget *xw;
+  WebKitWebView *webview;
+  char *data, *uri;
+
+  CHECK_XWIDGET (xwidget);
+  CHECK_STRING (text);
+  if (NILP (base_uri))
+    base_uri = build_string ("about:blank");
+  else
+    CHECK_STRING (base_uri);
+
+  base_uri = ENCODE_UTF_8 (base_uri);
+  text = ENCODE_UTF_8 (text);
+  xw = XXWIDGET (xwidget);
+
+  data = SSDATA (text);
+  uri = SSDATA (base_uri);
+  webview = WEBKIT_WEB_VIEW (xw->widget_osr);
+
+  block_input ();
+  webkit_web_view_load_html (webview, data, uri);
+  unblock_input ();
+
+  return Qnil;
+}
+#endif
+
 void
 syms_of_xwidget (void)
 {
@@ -2177,6 +2214,9 @@ syms_of_xwidget (void)
   defsubr (&Sxwidget_webkit_next_result);
   defsubr (&Sxwidget_webkit_previous_result);
   defsubr (&Sset_xwidget_buffer);
+#ifdef USE_GTK
+  defsubr (&Sxwidget_webkit_load_html);
+#endif
 
   DEFSYM (QCxwidget, ":xwidget");
   DEFSYM (QCtitle, ":title");
-- 
2.31.1


--=-=-=
Content-Type: text/plain


Thanks.

--=-=-=--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#51712; Package emacs. Full text available.

Severity set to 'wishlist' from 'normal' Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 51712 <at> debbugs.gnu.org:

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Po Lu <luangruo@HIDDEN>
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
 <83h7cl5urs.fsf@HIDDEN> <87y25x5tu9.fsf@HIDDEN>
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Date: Wed, 10 Nov 2021 01:22:48 +0100
In-Reply-To: <87czn8yii2.fsf@HIDDEN> (Po Lu's message of "Wed, 10 Nov 2021
 08:14:13 +0800")
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 Content preview:  Po Lu <luangruo@HIDDEN> writes: > Thanks, does this look
 OK to you? And I'm afraid I'm not terribly good > at phrasing this into words, 
 so I would really appreciate it if you > could help write that section of
 the manual. 
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Po Lu <luangruo@HIDDEN> writes:

> Thanks, does this look OK to you?  And I'm afraid I'm not terribly good
> at phrasing this into words, so I would really appreciate it if you
> could help write that section of the manual.

[...]

> +Optional argument @var{base-uri}, which should be a string, specifies
> +the location of web resources specified through relative links, such
> +as the resource @samp{foo.png} in the HTML tag @samp{<img
> +src="foo.png">}.  It defaults to @samp{about:blank}.

Looks good to me.

> +XWIDGET should be a WebKit xwidget, that will receive TEXT.  TEXT
> +should be a string that will be displayed by XWIDGET as HTML markup.
> +BASE_URI should be a string containing a URI that is used to fetch
> +resources, and if not specified, defaults to `about:blank'.  */)

Should probably be "relative resources (i.e., URLs that aren't
absolute)" or something of the kind.

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

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#51712; Package emacs. Full text available.

Message received at 51712 <at> debbugs.gnu.org:

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From: Po Lu <luangruo@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
 <83h7cl5urs.fsf@HIDDEN> <87y25x5tu9.fsf@HIDDEN>
 <831r3p5sn4.fsf@HIDDEN> <87wnlgyjcd.fsf@HIDDEN>
 <87r1bolvx1.fsf@HIDDEN>
Date: Wed, 10 Nov 2021 08:14:13 +0800
In-Reply-To: <87r1bolvx1.fsf@HIDDEN> (Lars Ingebrigtsen's message of "Wed,
 10 Nov 2021 01:02:50 +0100")
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--=-=-=
Content-Type: text/plain

Lars Ingebrigtsen <larsi@HIDDEN> writes:

> Po Lu <luangruo@HIDDEN> writes:
>
>>> Hmm... this is better, but at least I am still in the dark regarding
>>> the need for this optional argument.  E.g., what would happen if you
>>> use that tag, but don't specify the URI?
>>
>> I'm in the dark too.  I am not a web developer, and browser engines are
>> remarkably lax about these things, but hopefully Lars can explain better
>> (after all, shr must deal with these things too), so I added him to the
>> Ccs.
>
> The base URI is used when expanding relative links.  So if you have HTML
> that looks like
>
> <a href="foo.html"><img src="img.png"></a>
>
> then the browser can't resolve those two URLs without having the base
> URI.  So you'd pass in a base URI of https://example.com/foo/bar/zot if
> that's where the HTML snippet is from.
>
> When the URLs are absolute, the base URI is irrelevant.

Thanks, does this look OK to you?  And I'm afraid I'm not terribly good
at phrasing this into words, so I would really appreciate it if you
could help write that section of the manual.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Add-xwidget-webkit-load-html.patch

From 1d701339df5ed91ed730fb134976137bcf1e0ce6 Mon Sep 17 00:00:00 2001
From: Po Lu <luangruo@HIDDEN>
Date: Tue, 9 Nov 2021 21:36:40 +0800
Subject: [PATCH] Add `xwidget-webkit-load-html'

* doc/lispref/display.texi (Xwidgets): Document new function.
* etc/NEWS: Announce new function.
* src/xwidget.c (Fxwidget_webkit_load_html): New function.
(syms_of_xwidget): Define new subr.
---
 doc/lispref/display.texi | 11 +++++++++++
 etc/NEWS                 |  5 +++++
 src/xwidget.c            | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index b6bd14f887..aa7d64493c 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -6943,6 +6943,17 @@ Xwidgets
 signals an error.
 @end defun
 
+@defun xwidget-webkit-load-html xwidget text &optional base-uri
+Load @var{text}, a string, into @var{xwidget}, which should be a
+WebKit xwidget.  It treats @var{text} as HTML markup, which will be
+rendered by @var{xwidget}.
+
+Optional argument @var{base-uri}, which should be a string, specifies
+the location of web resources specified through relative links, such
+as the resource @samp{foo.png} in the HTML tag @samp{<img
+src="foo.png">}.  It defaults to @samp{about:blank}.
+@end defun
+
 @node Buttons
 @section Buttons
 @cindex buttons in buffers
diff --git a/etc/NEWS b/etc/NEWS
index 3cad0995ac..ae318be1c0 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -796,6 +796,11 @@ what the widget will actually receive.
 
 On GTK+, only key and function key events are implemented.
 
++++
+*** New function 'xwidget-webkit-load-html'.
+This function is used to load HTML text into WebKit xwidgets, without
+having to create a temporary file to store the markup.
+
 +++
 *** New functions for performing searches on WebKit xwidgets.
 Some new functions, such as 'xwidget-webkit-search', have been added
diff --git a/src/xwidget.c b/src/xwidget.c
index fc76ce307e..2587b658e7 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -2139,6 +2139,43 @@ DEFUN ("xwidget-webkit-finish-search", Fxwidget_webkit_finish_search,
   return Qnil;
 }
 
+#ifdef USE_GTK
+DEFUN ("xwidget-webkit-load-html", Fxwidget_webkit_load_html,
+       Sxwidget_webkit_load_html, 2, 3, 0,
+       doc: /* Make XWIDGET's WebKit widget render TEXT.
+XWIDGET should be a WebKit xwidget, that will receive TEXT.  TEXT
+should be a string that will be displayed by XWIDGET as HTML markup.
+BASE_URI should be a string containing a URI that is used to fetch
+resources, and if not specified, defaults to `about:blank'.  */)
+  (Lisp_Object xwidget, Lisp_Object text, Lisp_Object base_uri)
+{
+  struct xwidget *xw;
+  WebKitWebView *webview;
+  char *data, *uri;
+
+  CHECK_XWIDGET (xwidget);
+  CHECK_STRING (text);
+  if (NILP (base_uri))
+    base_uri = build_string ("about:blank");
+  else
+    CHECK_STRING (base_uri);
+
+  base_uri = ENCODE_UTF_8 (base_uri);
+  text = ENCODE_UTF_8 (text);
+  xw = XXWIDGET (xwidget);
+
+  data = SSDATA (text);
+  uri = SSDATA (base_uri);
+  webview = WEBKIT_WEB_VIEW (xw->widget_osr);
+
+  block_input ();
+  webkit_web_view_load_html (webview, data, uri);
+  unblock_input ();
+
+  return Qnil;
+}
+#endif
+
 void
 syms_of_xwidget (void)
 {
@@ -2177,6 +2214,9 @@ syms_of_xwidget (void)
   defsubr (&Sxwidget_webkit_next_result);
   defsubr (&Sxwidget_webkit_previous_result);
   defsubr (&Sset_xwidget_buffer);
+#ifdef USE_GTK
+  defsubr (&Sxwidget_webkit_load_html);
+#endif
 
   DEFSYM (QCxwidget, ":xwidget");
   DEFSYM (QCtitle, ":title");
-- 
2.31.1


--=-=-=--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#51712; Package emacs. Full text available.

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To: Po Lu <luangruo@HIDDEN>
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
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Date: Wed, 10 Nov 2021 01:02:50 +0100
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 07:56:02 +0800")
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 Content preview:  Po Lu <luangruo@HIDDEN> writes: >> Hmm... this is better, 
 but at least I am still in the dark regarding >> the need for this optional
 argument. E.g., what would happen if you >> use that tag, but don't specify
 the URI? > > I'm in th [...] 
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Po Lu <luangruo@HIDDEN> writes:

>> Hmm... this is better, but at least I am still in the dark regarding
>> the need for this optional argument.  E.g., what would happen if you
>> use that tag, but don't specify the URI?
>
> I'm in the dark too.  I am not a web developer, and browser engines are
> remarkably lax about these things, but hopefully Lars can explain better
> (after all, shr must deal with these things too), so I added him to the
> Ccs.

The base URI is used when expanding relative links.  So if you have HTML
that looks like

<a href="foo.html"><img src="img.png"></a>

then the browser can't resolve those two URLs without having the base
URI.  So you'd pass in a base URI of https://example.com/foo/bar/zot if
that's where the HTML snippet is from.

When the URLs are absolute, the base URI is irrelevant.

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

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From: Po Lu <luangruo@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
 <83h7cl5urs.fsf@HIDDEN> <87y25x5tu9.fsf@HIDDEN>
 <831r3p5sn4.fsf@HIDDEN>
Date: Wed, 10 Nov 2021 07:56:02 +0800
In-Reply-To: <831r3p5sn4.fsf@HIDDEN> (Eli Zaretskii's message of "Tue, 09 Nov
 2021 16:07:59 +0200")
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--=-=-=
Content-Type: text/plain

Eli Zaretskii <eliz@HIDDEN> writes:

> Then I'd suggest not to have it defined on non-GTK builds for now.  It
> is confusing to have a function that silently does nothing (after
> wasting some cycles).

Thanks, I'll keep that in mind.

> I'd say that TEXT should be a string.  The name itself doesn't
> necessarily say so.

Fixed, thanks.
>> +Optional argument @var{base-uri}, which should be a string, specifies
>> +the location of web resources, such as the resource @samp{foo.png} in
>> +the HTML tag @samp{<img src="foo.png">}.  It defaults to
>> +@samp{about:blank}.

> Hmm... this is better, but at least I am still in the dark regarding
> the need for this optional argument.  E.g., what would happen if you
> use that tag, but don't specify the URI?

I'm in the dark too.  I am not a web developer, and browser engines are
remarkably lax about these things, but hopefully Lars can explain better
(after all, shr must deal with these things too), so I added him to the
Ccs.

> This still leaves me wondering why the entry talks about temporary
> files.

Previously, loading custom markup into a widget required using a
temporary file to store the markup.

>> +DEFUN ("xwidget-webkit-load-html", Fxwidget_webkit_load_html,
>> +       Sxwidget_webkit_load_html, 2, 3, 0,
>> +       doc: /* Make XWIDGET's WebKit widget render text.
>                                                       ^^^^
> "text" should be in CAPS.

Thanks.

--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Add-xwidget-webkit-load-html.patch

From 8877c57a09dce06f6b1b64294ce8a632f862cc6e Mon Sep 17 00:00:00 2001
From: Po Lu <luangruo@HIDDEN>
Date: Tue, 9 Nov 2021 21:36:40 +0800
Subject: [PATCH] Add `xwidget-webkit-load-html'

* doc/lispref/display.texi (Xwidgets): Document new function.
* etc/NEWS: Announce new function.
* src/xwidget.c (Fxwidget_webkit_load_html): New function.
(syms_of_xwidget): Define new subr.
---
 doc/lispref/display.texi | 11 +++++++++++
 etc/NEWS                 |  5 +++++
 src/xwidget.c            | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index b6bd14f887..0b6dc05267 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -6943,6 +6943,17 @@ Xwidgets
 signals an error.
 @end defun
 
+@defun xwidget-webkit-load-html xwidget text &optional base-uri
+Load @var{text}, a string, into @var{xwidget}, which should be a
+WebKit xwidget.  It treats @var{text} as HTML markup, which will be
+rendered by @var{xwidget}.
+
+Optional argument @var{base-uri}, which should be a string, specifies
+the location of web resources, such as the resource @samp{foo.png} in
+the HTML tag @samp{<img src="foo.png">}.  It defaults to
+@samp{about:blank}.
+@end defun
+
 @node Buttons
 @section Buttons
 @cindex buttons in buffers
diff --git a/etc/NEWS b/etc/NEWS
index 807f31fa33..b55630336e 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -792,6 +792,11 @@ what the widget will actually receive.
 
 On GTK+, only key and function key events are implemented.
 
++++
+*** New function 'xwidget-webkit-load-html'.
+This function is used to load HTML text into WebKit xwidgets, without
+having to create a temporary file to store the markup.
+
 +++
 *** New functions for performing searches on WebKit xwidgets.
 Some new functions, such as 'xwidget-webkit-search', have been added
diff --git a/src/xwidget.c b/src/xwidget.c
index fc76ce307e..2587b658e7 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -2139,6 +2139,43 @@ DEFUN ("xwidget-webkit-finish-search", Fxwidget_webkit_finish_search,
   return Qnil;
 }
 
+#ifdef USE_GTK
+DEFUN ("xwidget-webkit-load-html", Fxwidget_webkit_load_html,
+       Sxwidget_webkit_load_html, 2, 3, 0,
+       doc: /* Make XWIDGET's WebKit widget render TEXT.
+XWIDGET should be a WebKit xwidget, that will receive TEXT.  TEXT
+should be a string that will be displayed by XWIDGET as HTML markup.
+BASE_URI should be a string containing a URI that is used to fetch
+resources, and if not specified, defaults to `about:blank'.  */)
+  (Lisp_Object xwidget, Lisp_Object text, Lisp_Object base_uri)
+{
+  struct xwidget *xw;
+  WebKitWebView *webview;
+  char *data, *uri;
+
+  CHECK_XWIDGET (xwidget);
+  CHECK_STRING (text);
+  if (NILP (base_uri))
+    base_uri = build_string ("about:blank");
+  else
+    CHECK_STRING (base_uri);
+
+  base_uri = ENCODE_UTF_8 (base_uri);
+  text = ENCODE_UTF_8 (text);
+  xw = XXWIDGET (xwidget);
+
+  data = SSDATA (text);
+  uri = SSDATA (base_uri);
+  webview = WEBKIT_WEB_VIEW (xw->widget_osr);
+
+  block_input ();
+  webkit_web_view_load_html (webview, data, uri);
+  unblock_input ();
+
+  return Qnil;
+}
+#endif
+
 void
 syms_of_xwidget (void)
 {
@@ -2177,6 +2214,9 @@ syms_of_xwidget (void)
   defsubr (&Sxwidget_webkit_next_result);
   defsubr (&Sxwidget_webkit_previous_result);
   defsubr (&Sset_xwidget_buffer);
+#ifdef USE_GTK
+  defsubr (&Sxwidget_webkit_load_html);
+#endif
 
   DEFSYM (QCxwidget, ":xwidget");
   DEFSYM (QCtitle, ":title");
-- 
2.31.1


--=-=-=--

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From: Eli Zaretskii <eliz@HIDDEN>
To: Po Lu <luangruo@HIDDEN>
In-Reply-To: <87y25x5tu9.fsf@HIDDEN> (message from Po Lu on Tue, 09 Nov
 2021 21:42:06 +0800)
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
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> From: Po Lu <luangruo@HIDDEN>
> Cc: 51712 <at> debbugs.gnu.org
> Date: Tue, 09 Nov 2021 21:42:06 +0800
> 
> >> +  text = ENCODE_UTF_8 (text);
> >> +  xw = XXWIDGET (xwidget);
> >> +
> >> +#ifdef USE_GTK
> >> +  data = SSDATA (text);
> >> +  uri = SSDATA (base_uri);
> >> +  webview = WEBKIT_WEB_VIEW (xw->widget_osr);
> >> +
> >> +  block_input ();
> >> +  webkit_web_view_load_html (webview, data, uri);
> >> +  unblock_input ();
> >> +#endif
> 
> > Hmm... if we only use TEXT and BASE-URI in the GTK build, why do we
> > encode them in the other builds?  Isn't that a waste of cycles?  IOW,
> > what does this function do if USE_GTK is not defined?
> 
> This feature isn't supported on macOS, but it's my hope that someone
> will port it to macOS in short order.

Then I'd suggest not to have it defined on non-GTK builds for now.  It
is confusing to have a function that silently does nothing (after
wasting some cycles).

> +@defun xwidget-webkit-load-html xwidget text &optional base-uri
> +Load @var{text} into @var{xwidget}, which should be a WebKit xwidget.
> +It treats @var{text} as HTML markup, which will be rendered by
> +@var{xwidget}.

I'd say that TEXT should be a string.  The name itself doesn't
necessarily say so.

> +Optional argument @var{base-uri}, which should be a string, specifies
> +the location of web resources, such as the resource @samp{foo.png} in
> +the HTML tag @samp{<img src="foo.png">}.  It defaults to
> +@samp{about:blank}.

Hmm... this is better, but at least I am still in the dark regarding
the need for this optional argument.  E.g., what would happen if you
use that tag, but don't specify the URI?

> +*** New function 'xwidget-webkit-load-html'.
> +This function is used to load HTML text into WebKit xwidgets, without
> +having to create a temporary file to store the markup.

This still leaves me wondering why the entry talks about temporary
files.
> +DEFUN ("xwidget-webkit-load-html", Fxwidget_webkit_load_html,
> +       Sxwidget_webkit_load_html, 2, 3, 0,
> +       doc: /* Make XWIDGET's WebKit widget render text.
                                                      ^^^^
"text" should be in CAPS.

Thanks.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#51712; Package emacs. Full text available.

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From: Po Lu <luangruo@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#51712: 29.0.50; [PATCH] New function
 `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
 <83h7cl5urs.fsf@HIDDEN>
Date: Tue, 09 Nov 2021 21:42:06 +0800
In-Reply-To: <83h7cl5urs.fsf@HIDDEN> (Eli Zaretskii's message of "Tue, 09 Nov
 2021 15:21:59 +0200")
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--=-=-=
Content-Type: text/plain

Eli Zaretskii <eliz@HIDDEN> writes:

>
> can you rephrase the last sentence not to use passive tense, please?
>
> But BASE-URI is not an &optional argument above.
>
> And also, this sentence is unnecessarily complex because you state the
> reason before the goal.  It is much better to do it the other way
> around, and while at that, make 2 simple sentences out of one complex
> one:
>
>   Optional argument @var{base-uri}, which should be a string,
>   specifies the location of the web resource.  It defaults to
>   @samp{about:blank}.
>
> (Of course, now this begs the question: what does it mean "web
> resource" for HTML text?  How about answering that in the text?)
>
> The second part is either unnecessary or too terse.  if it is
> important to explain that, please elaborate how temporary files are
> relevant here.
>
> The "plain text" part seems to contradict the text in the manual,
> which says it will be rendered as HTML markup?
>
> "will be" is confusing: why the future tense?
>
> Also, what kind of Lisp type is that?

It should be a string, thanks, I've resolved the concerns you listed
above.

> And I think explaining the importance of "fetching resources" would be
> beneficiary here.

I documented it in the manual the best I could.  I'm no web developer,
and the WebKitGTK documentation is vague on this subject, so I can't
think of anything better.

> And finally, "is treated as equivalent" is better reworded as "and
> defaults to ...", which is our style in these cases.

Thanks, done.

>> +  if (NILP (base_uri))
>> +    base_uri = build_string ("about:blank");
>> +  CHECK_STRING (base_uri);
>
> That last line should better be under 'else', right?

Done, thanks.

>> +  base_uri = ENCODE_UTF_8 (base_uri);

> Is it a good idea to produce non-ASCII URIs?

I personally think it's not, but the uuencoding of the URI is done by
WebKitGTK, which expects strings passed as the `uri' parameter to be
encoded as UTF-8 as opposed to uuencoded.

>> +  text = ENCODE_UTF_8 (text);
>> +  xw = XXWIDGET (xwidget);
>> +
>> +#ifdef USE_GTK
>> +  data = SSDATA (text);
>> +  uri = SSDATA (base_uri);
>> +  webview = WEBKIT_WEB_VIEW (xw->widget_osr);
>> +
>> +  block_input ();
>> +  webkit_web_view_load_html (webview, data, uri);
>> +  unblock_input ();
>> +#endif

> Hmm... if we only use TEXT and BASE-URI in the GTK build, why do we
> encode them in the other builds?  Isn't that a waste of cycles?  IOW,
> what does this function do if USE_GTK is not defined?

This feature isn't supported on macOS, but it's my hope that someone
will port it to macOS in short order.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Add-xwidget-webkit-load-html.patch

From 4d4b1013813bebf9d473cc04f73cf784fb759091 Mon Sep 17 00:00:00 2001
From: Po Lu <luangruo@HIDDEN>
Date: Tue, 9 Nov 2021 21:36:40 +0800
Subject: [PATCH] Add `xwidget-webkit-load-html'

* doc/lispref/display.texi (Xwidgets): Document new function.
* etc/NEWS: Announce new function.
* src/xwidget.c (Fxwidget_webkit_load_html): New function.
(syms_of_xwidget): Define new subr.
---
 doc/lispref/display.texi | 11 +++++++++++
 etc/NEWS                 |  5 +++++
 src/xwidget.c            | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index b6bd14f887..07b9f1a743 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -6943,6 +6943,17 @@ Xwidgets
 signals an error.
 @end defun
 
+@defun xwidget-webkit-load-html xwidget text &optional base-uri
+Load @var{text} into @var{xwidget}, which should be a WebKit xwidget.
+It treats @var{text} as HTML markup, which will be rendered by
+@var{xwidget}.
+
+Optional argument @var{base-uri}, which should be a string, specifies
+the location of web resources, such as the resource @samp{foo.png} in
+the HTML tag @samp{<img src="foo.png">}.  It defaults to
+@samp{about:blank}.
+@end defun
+
 @node Buttons
 @section Buttons
 @cindex buttons in buffers
diff --git a/etc/NEWS b/etc/NEWS
index 807f31fa33..b55630336e 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -792,6 +792,11 @@ what the widget will actually receive.
 
 On GTK+, only key and function key events are implemented.
 
++++
+*** New function 'xwidget-webkit-load-html'.
+This function is used to load HTML text into WebKit xwidgets, without
+having to create a temporary file to store the markup.
+
 +++
 *** New functions for performing searches on WebKit xwidgets.
 Some new functions, such as 'xwidget-webkit-search', have been added
diff --git a/src/xwidget.c b/src/xwidget.c
index fc76ce307e..37e4fd94c1 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -2139,6 +2139,45 @@ DEFUN ("xwidget-webkit-finish-search", Fxwidget_webkit_finish_search,
   return Qnil;
 }
 
+DEFUN ("xwidget-webkit-load-html", Fxwidget_webkit_load_html,
+       Sxwidget_webkit_load_html, 2, 3, 0,
+       doc: /* Make XWIDGET's WebKit widget render text.
+XWIDGET should be a WebKit xwidget, that will receive TEXT.  TEXT
+should be a string that will be displayed by XWIDGET as HTML markup.
+BASE_URI should be a string containing a URI that is used to fetch
+resources, and if not specified, defaults to `about:blank'.  */)
+  (Lisp_Object xwidget, Lisp_Object text, Lisp_Object base_uri)
+{
+  struct xwidget *xw;
+#ifdef USE_GTK
+  WebKitWebView *webview;
+  char *data, *uri;
+#endif
+
+  CHECK_XWIDGET (xwidget);
+  CHECK_STRING (text);
+  if (NILP (base_uri))
+    base_uri = build_string ("about:blank");
+  else
+    CHECK_STRING (base_uri);
+
+#ifdef USE_GTK
+  base_uri = ENCODE_UTF_8 (base_uri);
+  text = ENCODE_UTF_8 (text);
+  xw = XXWIDGET (xwidget);
+
+  data = SSDATA (text);
+  uri = SSDATA (base_uri);
+  webview = WEBKIT_WEB_VIEW (xw->widget_osr);
+
+  block_input ();
+  webkit_web_view_load_html (webview, data, uri);
+  unblock_input ();
+#endif
+
+  return Qnil;
+}
+
 void
 syms_of_xwidget (void)
 {
@@ -2177,6 +2216,7 @@ syms_of_xwidget (void)
   defsubr (&Sxwidget_webkit_next_result);
   defsubr (&Sxwidget_webkit_previous_result);
   defsubr (&Sset_xwidget_buffer);
+  defsubr (&Sxwidget_webkit_load_html);
 
   DEFSYM (QCxwidget, ":xwidget");
   DEFSYM (QCtitle, ":title");
-- 
2.31.1


--=-=-=--

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bug#51712; Package emacs. Full text available.

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Date: Tue, 09 Nov 2021 15:21:59 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: Po Lu <luangruo@HIDDEN>
In-Reply-To: <878rxx8w1i.fsf@HIDDEN> (bug-gnu-emacs@HIDDEN)
Subject: Re: bug#51712: 29.0.50;
 [PATCH] New function `xwidget-webkit-load-html'
References: <878rxx8w1i.fsf.ref@HIDDEN> <878rxx8w1i.fsf@HIDDEN>
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> Date: Tue, 09 Nov 2021 18:26:17 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> +@defun xwidget-webkit-load-html xwidget text base-uri
> +Load @var{text} into @var{xwidget}, which should be a WebKit xwidget.
> +@var{text} will be treated as HTML markup, and rendered by
> +@var{xwidget}.

can you rephrase the last sentence not to use passive tense, please?

> +For the purpose of controlling the location where web resources will
> +be found, you can optionally specify a base URI as a string in
> +@var{base-uri}, which defaults to @samp{about:blank}.

But BASE-URI is not an &optional argument above.

And also, this sentence is unnecessarily complex because you state the
reason before the goal.  It is much better to do it the other way
around, and while at that, make 2 simple sentences out of one complex
one:

  Optional argument @var{base-uri}, which should be a string,
  specifies the location of the web resource.  It defaults to
  @samp{about:blank}.

(Of course, now this begs the question: what does it mean "web
resource" for HTML text?  How about answering that in the text?)

> ++++
> +*** New function 'xwidget-webkit-load-html'.
> +This function is used to load HTML text into WebKit xwidgets, without
> +having to create a temporary file or URL.

The second part is either unnecessary or too terse.  if it is
important to explain that, please elaborate how temporary files are
relevant here.

> +DEFUN ("xwidget-webkit-load-html", Fxwidget_webkit_load_html,
> +       Sxwidget_webkit_load_html, 2, 3, 0,
> +       doc: /* Make XWIDGET's WebKit widget render text.
> +XWIDGET should be a WebKit xwidget, that will receive TEXT.  TEXT
> +should be a string that will be displayed by XWIDGET as plain text.

The "plain text" part seems to contradict the text in the manual,
which says it will be rendered as HTML markup?

> +BASE_URI will be a URI that is used to fetch resources, and if not
> +specified, is treated as equivalent to `about:blank'.  */)

"will be" is confusing: why the future tense?

Also, what kind of Lisp type is that?

And I think explaining the importance of "fetching resources" would be
beneficiary here.

And finally, "is treated as equivalent" is better reworded as "and
defaults to ...", which is our style in these cases.

> +  if (NILP (base_uri))
> +    base_uri = build_string ("about:blank");
> +  CHECK_STRING (base_uri);

That last line should better be under 'else', right?

> +  base_uri = ENCODE_UTF_8 (base_uri);

Is it a good idea to produce non-ASCII URIs?

> +  text = ENCODE_UTF_8 (text);
> +  xw = XXWIDGET (xwidget);
> +
> +#ifdef USE_GTK
> +  data = SSDATA (text);
> +  uri = SSDATA (base_uri);
> +  webview = WEBKIT_WEB_VIEW (xw->widget_osr);
> +
> +  block_input ();
> +  webkit_web_view_load_html (webview, data, uri);
> +  unblock_input ();
> +#endif

Hmm... if we only use TEXT and BASE-URI in the GTK build, why do we
encode them in the other builds?  Isn't that a waste of cycles?  IOW,
what does this function do if USE_GTK is not defined?

Thanks.

Information forwarded to bug-gnu-emacs@HIDDEN:
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From: Po Lu <luangruo@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 29.0.50; [PATCH] New function `xwidget-webkit-load-html'
Date: Tue, 09 Nov 2021 18:26:17 +0800
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--=-=-=
Content-Type: text/plain

Hopefully this allows to reduce the amount of JavaScript hacks needed to
load HTML into a widget.  It also lets you customize the base URI WebKit
uses to find web resources, which you can't do from JavaScript.

Thanks.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Add-xwidget-webkit-load-html.patch

From f368cd47dd5a2d232024ef1fb0f95f4b0c15e566 Mon Sep 17 00:00:00 2001
From: Po Lu <luangruo@HIDDEN>
Date: Tue, 9 Nov 2021 18:24:03 +0800
Subject: [PATCH] Add `xwidget-webkit-load-html'

* doc/lispref/display.texi (Xwidgets): Document new function.
* etc/NEWS: Announce new function.
* src/xwidget.c (Fxwidget_webkit_load_html): New function.
(syms_of_xwidget): Define new subr.
---
 doc/lispref/display.texi | 10 ++++++++++
 etc/NEWS                 |  5 +++++
 src/xwidget.c            | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+)

diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index b6bd14f887..3ccc755391 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -6943,6 +6943,16 @@ Xwidgets
 signals an error.
 @end defun
 
+@defun xwidget-webkit-load-html xwidget text base-uri
+Load @var{text} into @var{xwidget}, which should be a WebKit xwidget.
+@var{text} will be treated as HTML markup, and rendered by
+@var{xwidget}.
+
+For the purpose of controlling the location where web resources will
+be found, you can optionally specify a base URI as a string in
+@var{base-uri}, which defaults to @samp{about:blank}.
+@end defun
+
 @node Buttons
 @section Buttons
 @cindex buttons in buffers
diff --git a/etc/NEWS b/etc/NEWS
index 807f31fa33..93c161025b 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -792,6 +792,11 @@ what the widget will actually receive.
 
 On GTK+, only key and function key events are implemented.
 
++++
+*** New function 'xwidget-webkit-load-html'.
+This function is used to load HTML text into WebKit xwidgets, without
+having to create a temporary file or URL.
+
 +++
 *** New functions for performing searches on WebKit xwidgets.
 Some new functions, such as 'xwidget-webkit-search', have been added
diff --git a/src/xwidget.c b/src/xwidget.c
index fc76ce307e..22893bfe2e 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -2139,6 +2139,43 @@ DEFUN ("xwidget-webkit-finish-search", Fxwidget_webkit_finish_search,
   return Qnil;
 }
 
+DEFUN ("xwidget-webkit-load-html", Fxwidget_webkit_load_html,
+       Sxwidget_webkit_load_html, 2, 3, 0,
+       doc: /* Make XWIDGET's WebKit widget render text.
+XWIDGET should be a WebKit xwidget, that will receive TEXT.  TEXT
+should be a string that will be displayed by XWIDGET as plain text.
+BASE_URI will be a URI that is used to fetch resources, and if not
+specified, is treated as equivalent to `about:blank'.  */)
+  (Lisp_Object xwidget, Lisp_Object text, Lisp_Object base_uri)
+{
+  struct xwidget *xw;
+#ifdef USE_GTK
+  WebKitWebView *webview;
+  char *data, *uri;
+#endif
+
+  CHECK_XWIDGET (xwidget);
+  CHECK_STRING (text);
+  if (NILP (base_uri))
+    base_uri = build_string ("about:blank");
+  CHECK_STRING (base_uri);
+  base_uri = ENCODE_UTF_8 (base_uri);
+  text = ENCODE_UTF_8 (text);
+  xw = XXWIDGET (xwidget);
+
+#ifdef USE_GTK
+  data = SSDATA (text);
+  uri = SSDATA (base_uri);
+  webview = WEBKIT_WEB_VIEW (xw->widget_osr);
+
+  block_input ();
+  webkit_web_view_load_html (webview, data, uri);
+  unblock_input ();
+#endif
+
+  return Qnil;
+}
+
 void
 syms_of_xwidget (void)
 {
@@ -2177,6 +2214,7 @@ syms_of_xwidget (void)
   defsubr (&Sxwidget_webkit_next_result);
   defsubr (&Sxwidget_webkit_previous_result);
   defsubr (&Sset_xwidget_buffer);
+  defsubr (&Sxwidget_webkit_load_html);
 
   DEFSYM (QCxwidget, ":xwidget");
   DEFSYM (QCtitle, ":title");
-- 
2.31.1


--=-=-=--

Acknowledgement sent to Po Lu <luangruo@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.

Report forwarded to bug-gnu-emacs@HIDDEN:
bug#51712; Package emacs. Full text available.

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Last modified: Wed, 10 Nov 2021 13:00:02 UTC

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