Reading Atom feeds with Gnus

Reading Atom feeds with Gnus

[Harald Jörg]

Hello all,

I'm moving (back) to Gnus as my mail+news+feed client, after having
tried another program for some time without being really happy with it.
During that time, some of the feeds I like to read moved from RSS to
Atom-only - and I haven't figured out how to read those with Gnus.

Right now, I'm using news.gwene.org to convert the Atom feeds to NNTP
which works quite fine.  But this seems to be an unneccessary detour, so
I'd prefer some "direct" approach.

So... is there a recommended way to read Atom feeds with Gnus?
--
Cheers,
haj

Re: Reading Atom feeds with Gnus

[Emanuel Berg via Users list for the GNU Emacs text editor]

Harald Jörg wrote:

> Right now, I'm using news.gwene.org to convert the
> Atom feeds to NNTP which works quite fine. But this
> seems to be an unneccessary detour, so I'd prefer
> some "direct" approach.

It isn't!

Gwene is great!

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal

Re: Reading Atom feeds with Gnus

[Harald Jörg]

Emanuel Berg via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> Harald Jörg wrote:
>
>> Right now, I'm using news.gwene.org to convert the
>> Atom feeds to NNTP which works quite fine. But this
>> seems to be an unneccessary detour, so I'd prefer
>> some "direct" approach.
>
> It isn't!
>
> Gwene is great!

Thanks for the confirmation.  Indeed, Gwene is a great and very
convenient service.  Extremely easy to use and free of charge.

The issues of using a proxy are irrelevant in my current use case, but
they exist in more paranoic situations:

 - Privacy: I need to share with a 3rd party which feeds I'm reading.

 - Authenticity and Confidentiality: I'm losing the ability to verify
   certificates of SSL-protected Atom feeds (many of them are). There's
   no end-to-end encryption, if the proxy is hijacked, it can suppress
   articles, or feed me fake news.

 - Identity: I shouldn't use that services to read feeds which need
   user authentication.

None of these concerns bothers me for the Atom feeds I read right now,
so I guess I'll just continue to use Gwene - with compliments to its
provider :)
--
Cheers,
haj

Re: Reading Atom feeds with Gnus

[Tim Landscheidt]

haj@posteo.de (Harald Jörg) wrote:

> I'm moving (back) to Gnus as my mail+news+feed client, after having
> tried another program for some time without being really happy with it.
> During that time, some of the feeds I like to read moved from RSS to
> Atom-only - and I haven't figured out how to read those with Gnus.

> Right now, I'm using news.gwene.org to convert the Atom feeds to NNTP
> which works quite fine.  But this seems to be an unneccessary detour, so
> I'd prefer some "direct" approach.

> So... is there a recommended way to read Atom feeds with Gnus?

I don't know, but I'm very interested as well.  I'm using
newsticker at the moment, but a) that's not Gnus and b) it
seems to react in a fragile manner to not being able to con-
nect to servers (i. e. by just resetting all messages to un-
read).

(The backend duplication between Gnus and newsticker is
probably not helpful.)

Tim

Re: Reading Atom feeds with Gnus

[Emanuel Berg via Users list for the GNU Emacs text editor]

Tim Landscheidt wrote:

> I don't know, but I'm very interested as well.
> I'm using newsticker at the moment, but a) that's
> not Gnus and b) it seems to react in a fragile
> manner to not being able to con- nect to servers
> (i. e. by just resetting all messages to un- read).
>
> (The backend duplication between Gnus and
> newsticker is probably not helpful.)

What material in particular is it you look for? I can
check in one second if it is available in Gwene,
using Gnus, news.gmane.io .

And if it is, absolutely no reason not to use Gwene.

IMO :)

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal

Re: Reading Atom feeds with Gnus

[Sharon Kimble]

[-- Attachment #1: Type: text/plain, Size: 1720 bytes --]

haj@posteo.de (Harald Jörg) writes:

> Hello all,
>
> I'm moving (back) to Gnus as my mail+news+feed client, after having
> tried another program for some time without being really happy with it.
> During that time, some of the feeds I like to read moved from RSS to
> Atom-only - and I haven't figured out how to read those with Gnus.
>
> Right now, I'm using news.gwene.org to convert the Atom feeds to NNTP
> which works quite fine.  But this seems to be an unneccessary detour, so
> I'd prefer some "direct" approach.
>
> So... is there a recommended way to read Atom feeds with Gnus?

Hi Haj.

I do it everyday and it seems to be working out okay. I'll share with
you what I use.
    
And this comes from the gnu section of my config.

--8<---------------cut here---------------start------------->8---
  (require 'mm-url)
  (defadvice mm-url-insert (after DE-convert-atom-to-rss () )
    "Converts atom to RSS by calling xsltproc."
    (when (re-search-forward "xmlns=\"http://www.w3.org/.*/Atom\""
                             nil t)
      (goto-char (point-min))
      (message "Converting Atom to RSS... ")
      (call-process-region (point-min) (point-max)
                           "xsltproc"
                           t t nil
                           (expand-file-name "/home/boudiccas/.emacs.d/atom2rss.xsl") "-")
      (goto-char (point-min))
      (message "Converting Atom to RSS... done")))
--8<---------------cut here---------------end--------------->8---
      
I hope these help you. I've had the atom2rss file for some time (its
dated to 2018-06-25) and I can't remember where I got it from, so if
anyone knows I'd love to know.

Thanks
  Sharon.  


[-- Attachment #2: atom2rss --]
[-- Type: application/xslt+xml, Size: 9449 bytes --]

<?xml version="1.0" encoding="UTF-8" ?>
<!-- Released under CC lincense http://creativecommons.org/licenses/by/2.5/ -->
<!-- Feeds generated using this stylesheet (or it's derivatives) must put http://atom.geekhood.net in <generator> element -->
<x:stylesheet version="1.0" 
	exclude-result-prefixes="atom xhtml php"
	xmlns:php="http://php.net/xsl"
	xmlns:x="http://www.w3.org/1999/XSL/Transform" 
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:xhtml="http://www.w3.org/1999/xhtml">
<x:output encoding="utf-8" indent="yes" method="xml" media-type="application/rss+xml" />

<x:template match="/atom:feed">
	<rss version="2.0">
		<channel>
			<x:if test="//@xml:lang">
				<language><x:value-of select="//@xml:lang[1]" /></language>
			</x:if>
			
			<description>
				<x:choose>
					<x:when test="atom:subtitle"><x:apply-templates select="atom:subtitle" mode="asHTML"/></x:when>
					<x:otherwise>
						<!-- this sucks -->
						<x:apply-templates select="atom:title" mode="asHTML"/> (converted from Atom 1.0)
					</x:otherwise>
				</x:choose>
			</description>
		
			<x:choose>
				<x:when test="atom:logo"><image><x:apply-templates select="atom:logo" mode="image"/></image></x:when>
				<x:when test="atom:icon"><image><x:apply-templates select="atom:icon" mode="image"/></image></x:when>
			</x:choose>
			
			<x:apply-templates />
			<generator><x:if test="atom:generator"><x:apply-templates select="atom:generator" mode="gen"/> + </x:if>Atom 1.0 XSLT+PHP Transform v1.1 (http://atom.geekhood.net)</generator>
		</channel>
	</rss>
</x:template>


<!-- simple losless conversions -->
<x:template match="atom:contributor">
	<dc:contributor><x:call-template name="person" /></dc:contributor>
</x:template>

<x:template match="atom:title">
	<title><x:call-template name="asHTML" /></title>
</x:template>

<x:template match="atom:generator"/>
<x:template match="atom:generator" mode="gen">
	<x:apply-templates mode="asText"/> <x:if test="@version"> v<x:value-of select="@version"/></x:if> <x:if test="@uri"> (<x:value-of select="@uri"/>)</x:if>
</x:template>

<x:template match="atom:published|atom:updated">
	<x:if test="local-name() = 'published' or not(../atom:published)">
		<pubDate>
			<x:choose>
				<x:when test="function-available('php:function')">
					<x:variable name="time" select="php:function('strtotime', string(.))"/>
					<x:value-of select="php:function('gmstrftime', '%a, %d %b %Y %T %Z', $time)"/>
				</x:when>
 				<x:otherwise>
					<x:apply-templates/>
				</x:otherwise>
			</x:choose>
		</pubDate>
	</x:if>
</x:template>

<x:template match="atom:rights"><copyright><x:apply-templates /></copyright></x:template>

<x:template match="atom:link[not(@rel) or @rel='alternate']">
	<x:if test="generate-id(.) = generate-id(../atom:link[not(@rel) or @rel='alternate'][1])">
		<link><x:value-of select="@href"/></link>
	</x:if>
</x:template>

<x:template match="atom:link[@rel='enclosure']">
	<x:if test="generate-id(.) = generate-id(../atom:link[@rel='enclosure'][1])">
		<enclosure url="{@href}" type="{@type}" length="{@length}"/>
	</x:if>
</x:template>

<x:template match="atom:entry/atom:id">
	<guid>
		<x:if test="not(. = ../atom:link[@rel='alternate']/@href) and not(. = ../atom:link[@rel='permalink']/@href) and not(. = ../atom:link[not(@rel)]/@href)">
			<x:attribute name="isPermaLink">false</x:attribute>
		</x:if>
		<x:apply-templates />
	</guid>
</x:template>

<!-- dodgy conversions -->
<x:template match="atom:icon|atom:logo"/><!-- merged into rss:image -->
<x:template match="atom:icon|atom:logo" mode="image">
	<url><x:value-of select="."/></url>
	<x:if test="../atom:title"><title><x:apply-templates select="../atom:title" mode="asText" /></title></x:if>
	<x:if test="../atom:link[not(@rel) or @rel='alternate']"><link><x:value-of select="../atom:link[not(@rel) or @rel='alternate'][1]/@href"/></link></x:if>
</x:template>

<x:template name="person">
	<x:choose>
		<x:when test="atom:email"><x:value-of select="atom:email"/></x:when>
		<x:when test="/atom:feed/atom:author[./atom:email][1]/atom:email"><x:value-of select="/atom:feed/atom:author[./atom:email][1]/atom:email"/></x:when>
	</x:choose>
	 (<x:value-of select="atom:name"/><x:if test="@uri"> <x:value-of select="uri"/></x:if>)
</x:template>
	
<x:template match="atom:author[not(starts-with(./atom:email,'webmaster@'))][1]">
	<x:if test="atom:email">
		<managingEditor>
			<x:call-template name="person" />
		</managingEditor>
	</x:if>
</x:template>

<x:template match="atom:author[starts-with(./atom:email,'webmaster@')][1]">
	<webMaster>
		<x:call-template name="person" />
	</webMaster>
</x:template>

<x:template match="atom:subtitle"/>

<x:template match="atom:source">
	<source url="{atom:link[@rel='self']}"><x:apply-templates select="atom:title" mode="asText"/></source>
</x:template>

<!-- lossy conversion -->
<x:template match="atom:feed/atom:id"/>

<x:template match="atom:feed/atom:link[@rel='self']">
<x:comment> source: <x:value-of select="@href"/><x:text> </x:text></x:comment></x:template>

<x:template match="atom:category"><!-- label gets lost -->
	<category>
		<x:if test="@scheme">
			<x:attribute name="domain"><x:value-of select="@scheme"/></x:attribute>
		</x:if>
		<x:value-of select="@term"/>
		<x:if test="@label and not(@label = @term)"><x:comment><x:value-of select="@label"/></x:comment></x:if>
	</category>
</x:template>


<!-- entry -->
<x:template match="atom:summary|atom:content"/>

<x:template match="atom:entry">
<item>
	<x:choose>
		<x:when test="atom:summary"><description><x:apply-templates select="atom:summary" mode="asHTML"/> <x:if test="atom:content"> (...)</x:if></description></x:when> 
		<x:when test="atom:content"><description><x:apply-templates select="atom:content" mode="asHTML"/></description></x:when> 
	</x:choose>
	<x:apply-templates/>
	<x:if test="not(atom:source) and /atom:feed/atom:link[@rel='self']">
		<source url="{/atom:feed/atom:link[@rel='self']/@href}">
			<x:choose>
				<x:when test="/atom:feed/atom:link[@rel='self' and @title]"><x:value-of select="/atom:feed/atom:link[@rel='self']/@title"/></x:when>
				<x:otherwise><x:apply-templates select="/atom:feed/atom:title" mode="asText"/></x:otherwise>
			</x:choose>
		</source>
	</x:if>
	<x:apply-templates select="atom:source/atom:category"/>
	<x:if test="not(atom:copyright)"><x:apply-templates select="atom:source/atom:copyright"/></x:if>
	<x:if test="not(atom:author)"><x:apply-templates select="atom:source/atom:author"/></x:if>
	<x:if test="not(atom:contributor)"><x:apply-templates select="atom:source/atom:contributor"/></x:if>
	<x:if test="not(atom:updated)"><x:apply-templates select="atom:source/atom:updated"/></x:if>
</item>
</x:template>


<!-- santas little helpers -->
<x:template match="*" mode="asHTML"><x:call-template name="asHTML"/></x:template>
<x:template name="asHTML">
	<x:choose>
		<x:when test="@type='xhtml'">
			<x:apply-templates select="xhtml:div" mode="xhtml2html" />
		</x:when>
		<x:when test="@type='html'"><x:value-of select="." /></x:when>
		<x:otherwise>
			<x:value-of select="."/>
		</x:otherwise>
	</x:choose>		
</x:template>

<x:template match="*[@type='html' or @type='text/html']" mode="asText">
	<x:call-template name="removeHtml"><x:with-param name="text" select="."/></x:call-template>
</x:template>

<x:template match="*" mode="asText">
	<x:value-of select="."/>
</x:template>


<!-- html 2 text (primitive method) -->
<x:template name="removeHtml">
  <x:param name="text"/>
  <x:choose>
    <x:when test="contains($text, '&lt;') and contains(substring-after($text, '&lt;'),'&gt;')">
		<x:value-of select="substring-before($text, '&lt;')"/>
		<x:call-template name="removeHtml">
  		<x:with-param name="text" select="substring-after(substring-after($text,'&lt;'),'&gt;')"/>
		</x:call-template>
    </x:when> 
    <x:otherwise>
      <x:value-of select="$text"/>  
    </x:otherwise>
 </x:choose>            
</x:template>


<!-- xhtml 2 html -->
<x:template match="xhtml:img|xhtml:br|xhtml:hr|xhtml:input|xhtml:col|xhtml:area|xhtml:input|xhtml:link|xhtml:meta|xhtml:param" mode="xhtml2html">
	&lt;<x:value-of select="local-name(.)"/><x:apply-templates select="@*" mode="xhtml2html"/>&gt;<x:apply-templates mode="xhtml2html"/>
</x:template>

<x:template match='xhtml:*' mode="xhtml2html">
	&lt;<x:value-of select="local-name(.)"/><x:apply-templates select="@*" mode="xhtml2html"/>&gt;<x:apply-templates mode="xhtml2html"/>&lt;/<x:value-of select="local-name(.)"/>&gt;
</x:template>

<x:template match='@*' mode="xhtml2html">
	<x:text> </x:text><x:value-of select="local-name(.)"/>="<x:value-of select="."/>"</x:template>

<x:template match="comment()" mode="xhtml2html">
	<x:text disable-output-escaping="yes">&lt;![CDATA[</x:text>
	<x:comment><x:value-of select="."/></x:comment>
	<x:text disable-output-escaping="yes">]]&gt;</x:text>			
</x:template>

<x:template match="text()" mode="xhtml2html">
	<x:choose>
		<x:when test="contains(.,'&amp;') or contains(.,'&lt;')">
			<x:text disable-output-escaping="yes">&lt;![CDATA[</x:text>
			<x:value-of select="." />
			<x:text disable-output-escaping="yes">]]&gt;</x:text>			
		</x:when>
		<x:otherwise>
			<x:value-of select="."/>
		</x:otherwise>
	</x:choose>
</x:template>


<!-- copy extensions -->
<x:template match='*'>
	<x:comment>Unknown element <x:value-of select="local-name(.)"/></x:comment>
	<x:copy>
  	<x:copy-of select='node()|@*'/>
	</x:copy>
</x:template>

</x:stylesheet>

[-- Attachment #3: Type: text/plain, Size: 175 bytes --]

-- 
A taste of linux = http://www.sharons.org.uk
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Debian 10.6, fluxbox 1.3.7, emacs 27.1.50, org 9.4

Re: Reading Atom feeds with Gnus

[Harald Jörg]

Hello Sharon,

you write:

> haj@posteo.de (Harald Jörg) writes:
>
>> Hello all,
>>
>> I'm moving (back) to Gnus as my mail+news+feed client, after having
>> tried another program for some time without being really happy with it.
>> During that time, some of the feeds I like to read moved from RSS to
>> Atom-only - and I haven't figured out how to read those with Gnus.
>> [...]
>> So... is there a recommended way to read Atom feeds with Gnus?
>
> Hi Haj.
>
> I do it everyday and it seems to be working out okay. I'll share with
> you what I use.
>     
> And this comes from the gnu section of my config.
>
>   (require 'mm-url)
>   (defadvice mm-url-insert (after DE-convert-atom-to-rss () )
>     "Converts atom to RSS by calling xsltproc."
>     (when (re-search-forward "xmlns=\"http://www.w3.org/.*/Atom\""
>                              nil t)
>       (goto-char (point-min))
>       (message "Converting Atom to RSS... ")
>       (call-process-region (point-min) (point-max)
>                            "xsltproc"
>                            t t nil
>                            (expand-file-name "/home/boudiccas/.emacs.d/atom2rss.xsl") "-")
>       (goto-char (point-min))
>       (message "Converting Atom to RSS... done")))

Thanks!

I recall that I've read something about an on-the-fly conversion, but I
lost the reference.  Chances are that something like this is what it was
about.
       
> I hope these help you. I've had the atom2rss file for some time (its
> dated to 2018-06-25) and I can't remember where I got it from, so if
> anyone knows I'd love to know.

That would probably be https://atom.geekhood.net/ (found in the XSL file).

I guess I could use this.  I usually have xsltproc lying around on the
systems where I read news.  I can probably live without the optional PHP
stuff (which I don't have).  It has its hacky parts (e.g. assuming that
Atom always gets assigned the "empty" namespace), but should work quite
well in practice.

Hm.  I wonder... since Emacs is (per default) built with libxml2, maybe
this can be leveraged to do this directly in Emacs... there's
libxml-parse-xml-region... maybe I should look at that.

Again, thanks for the hints!
--
Cheers,
haj

Re: Reading Atom feeds with Gnus

[Stefan Monnier]

> Hm.  I wonder... since Emacs is (per default) built with libxml2, maybe
> this can be leveraged to do this directly in Emacs... there's
> libxml-parse-xml-region... maybe I should look at that.

Any chance someone would be motivated enough to either add an
`nnatom.el` package or improve `nnrss.el` so it also understands
Atom feeds?


        Stefan

Re: Reading Atom feeds with Gnus

[Emanuel Berg via Users list for the GNU Emacs text editor]

Stefan Monnier wrote:

>> Hm. I wonder... since Emacs is (per default) built
>> with libxml2, maybe this can be leveraged to do
>> this directly in Emacs... there's
>> libxml-parse-xml-region... maybe I should look
>> at that.
>
> Any chance someone would be motivated enough to
> either add an `nnatom.el` package or improve
> `nnrss.el` so it also understands Atom feeds?

I'll do it, if you answer my questions :)

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal

Re: Reading Atom feeds with Gnus

[Stefan Monnier]

> I'll do it, if you answer my questions :)

I've never looked at `nnrss.el` and know nothing about either RSS or
Atom formats (except that I believe they're both XML-based), so there's
a good chance you'll have questions I can't answer, but other than
that... I like answering questions.


        Stefan

Re: Reading Atom feeds with Gnus

[Jude DaShiell]

Has anyone on this list got a copy of the latest edition of "The File
Formats Book"?  It's an authoritative reference and any self-respecting
reference library specializing in computer programmer clientel ought to
have one of these books.

On Wed, 21 Oct 2020, Stefan Monnier wrote:

> Date: Wed, 21 Oct 2020 15:08:00
> From: Stefan Monnier <monnier@iro.umontreal.ca>
> To: help-gnu-emacs@gnu.org
> Subject: Re: Reading Atom feeds with Gnus
>
> > I'll do it, if you answer my questions :)
>
> I've never looked at `nnrss.el` and know nothing about either RSS or
> Atom formats (except that I believe they're both XML-based), so there's
> a good chance you'll have questions I can't answer, but other than
> that... I like answering questions.
>
>
>         Stefan
>
>
>

-- 

Re: Reading Atom feeds with Gnus

[Emanuel Berg via Users list for the GNU Emacs text editor]

Stefan Monnier wrote:

>> I'll do it, if you answer my questions :)
>
> I've never looked at `nnrss.el` and know nothing about either RSS or
> Atom formats (except that I believe they're both XML-based), so
> there's a good chance you'll have questions I can't answer, but
> other than that... I like answering questions.

I'll start looking at it and learn little by little.

However if anyone has real experience from this or neighboring areas
- please jump in at any stage, as that makes more ... sense.

And do post any material, unfinished code etc, here!

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal