How to use Pretext Callback for custom RSS Feed?

Hipocrite · 2007-12-21 04:40:15

Seems like it should be rather simple. I already have a custom feed setup via a page called rss-feed. How do I output the rss-feed page in place of rss?

register_callback(‘gbb_rss_feed’, ‘pretext’);

function gbb_rss_feed() { // output rss-feed page if user accessed /rss
}

net-carver · 2007-12-21 05:31:26

If it’s a simple matter of re-formatting data then why not register a routine for the rss_entry event and let the default code take care of building the feed for you.

If you really want to go ahead and replace the default rss routines then yes, I think a pretext callback like this…

register_callback( 'gbb_rss_wrapper' , 'pretext' );

function gbb_rss_wrapper()
    {
    if(gps('rss')) 
        exit( gbb_rss_feed() );
    }

…might do it.

Edited to add: Of course, you’ll need to make sure that your custom feed routine outputs all the right headers and formats a valid feed. Watch out for lurking whitespace at the start or end of any included php files.

Last edited by net-carver (2007-12-21 05:33:05)

Hipocrite · 2007-12-21 05:39:50

The reason I don’t want to hook into rss_entry is that my feed is completely customized in a way that using a page template makes it really easy to construct the feed itself.

Thank you for the code… however, the function that I don’t know how to write is the gbb_rss_feed() function (that would output the “rss-feed” page).

Also, what does the exit() function do in this context (or in any context)?

net-carver · 2007-12-21 05:59:05

Ok,

Here’s the php.net entry for exit(). You might want to bookmark that site or download the manual for future reference — it’s very useful.
Ok, the code for gbb_rss_feed() — you could start by looking at the textpattern/publish/rss.php file. That’s where the normal php processing code lives.

However, if you are going for a page/form solution you shouldn’t need this, just do what Matthew did in this thread.

(Edited to add missing link to the exit manual entry)

Last edited by net-carver (2007-12-21 06:00:47)

Hipocrite · 2007-12-21 06:14:01

net-carver, thanks for the response! However, I don’t think you understand how truly simple my question is. I have already created the page/form and tested the feed and everything. All I need to know how to do is output the actual section/page/form.

(Sorry, I did mix up my naming in previous post: I have a section called rss-feed that uses a page called rss which uses a plugin called mg_setheader and calls a form called rss-item.)

Thanks, I now understand what exit() does. It seems like I should be calling the textpattern() function or something, like:

exit(textpattern(‘rss-feed’))

but obviously that’s not correct.

net-carver · 2007-12-21 06:40:30

Yeah, you’re probably right about my not understanding :0)

Try just putting this link in your html head then…

<link rel="alternate" type="application/rss+xml" title="RSS Feed" href="http://YOUR SITE HERE/rss-feed/" />

No need to approach it programmatically if the /rss-feed section is producing valid output.

Regards,

Hipocrite · 2007-12-21 07:06:07

Thanks again, but that’s not it: I have already done that.

Here is my website:
http://www.hookah-cafe.com

Here is my custom feed (it works, try it):
http://www.hookah-cafe.com/rss-feed

Here is the default textpattern feed:
http://www.hookah-cafe.com/rss

When my users go to http://www.hookah-cafe.com/rss I want textpattern to output the custom feed instead of the default feed. (I don’t want to use a redirect)

net-carver · 2007-12-21 07:13:11

Ok, now I think I understand (but then again!)

Give this a try: look in textpattern/publish.php for the preText() routine…

	function preText($s,$prefs)
	{
		extract($prefs);

		callback_event('pretext');

#		if(gps('rss')) {
#			include txpath.'/publish/rss.php';
#			exit(rss());
#		}
...

Just comment out the code that calls the normal rss routine. Now rename your rss-feeds section to rss and it might just do it. (But that is a guess.)

Hipocrite · 2007-12-21 08:05:44

Modifying config.php is not an option I like. But that’s ok, I think I found the simplest way. (Messy URL’s wont work but I don’t use them…)

Thanks!

register_callback('gbb_rss_feed', 'pretext');

function gbb_rss_feed() { 
    $req = '';
    if ($permlink_mode != "messy") {
	$req = serverSet('REQUEST_URI');
        extract(chopUrl($req));
    }

    if (($u1 == 'rss') or gps('rss')) {
        // could use something more generic
        $_SERVER['REQUEST_URI'] = 'http://www.hookah-cafe.com/rss-feed';
    }
}

net-carver · 2007-12-21 08:09:53

Yes, that looks even better than my idea.

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#1 2007-12-21 04:40:15

How to use Pretext Callback for custom RSS Feed?

#2 2007-12-21 05:31:26

Re: How to use Pretext Callback for custom RSS Feed?

#3 2007-12-21 05:39:50

Re: How to use Pretext Callback for custom RSS Feed?

#4 2007-12-21 05:59:05

Re: How to use Pretext Callback for custom RSS Feed?

#5 2007-12-21 06:14:01

Re: How to use Pretext Callback for custom RSS Feed?

#6 2007-12-21 06:40:30

Re: How to use Pretext Callback for custom RSS Feed?

#7 2007-12-21 07:06:07

Re: How to use Pretext Callback for custom RSS Feed?

#8 2007-12-21 07:13:11

Re: How to use Pretext Callback for custom RSS Feed?

#9 2007-12-21 08:05:44

Re: How to use Pretext Callback for custom RSS Feed?

#10 2007-12-21 08:09:53

Re: How to use Pretext Callback for custom RSS Feed?

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