Making your plugins 4.7-aware

etc · 2017-09-14 11:22:31

We all remember the plugin breakage panic provoked by some changes (mainly registration and null date defaults) in txp 4.6. Fortunately, the most popular plugins are patched now, so it’s time to make them 4.7-ready.

The good news is that a vast majority of 4.6-compatible (public-side) plugins should work in 4.7 without any problem. But, to be sure, or if you want your favorite plugin to enjoy new possibilities, please read what follows.

An important new feature of the upcoming txp 4.7 are global attributes. Roughly speaking, any plugin can register one or more attributes that will be valid for any (core or plugin) tag and applied to its output.

Let us consider a basic example. Suppose that we need a plugin that replaces all the occurrences of from string to to string. In 4.6 we would do it this way:

// TXP 4.6 tag registration
if (class_exists('\Textpattern\Tag\Registry')) {
	Txp::get('\Textpattern\Tag\Registry')->register('abc_replace');
}

function abc_replace($atts, $thing = null)
{
	extract(lAtts(array(
		'from' => 'foo',
		'to' => 'bar'
	), $atts, false));

	return str_replace($from, $to, $thing);
}

Now, the new abc_replace tag can be used as container:

<txp:abc_replace from="wordpress" to="textpattern">
	<txp:body />
</txp:abc_replace>

In 4.7 we get new powers: implement our plugin as attribute:

// TXP 4.7 tag registration
if (class_exists('\Textpattern\Tag\Registry')) {
	Txp::get('\Textpattern\Tag\Registry')->register('abc_replace'); //container mode
	if(method_exists('\Textpattern\Tag\Registry', 'registerAttr'))    //attribute mode
		Txp::get('\Textpattern\Tag\Registry')->registerAttr('abc_replace', 'from')->registerAttr('abc_replace', 'to');
}

function abc_replace($atts, $thing = null) { ... }

And voilà, now every tag also accepts from and to attributes:

<txp:body from="wordpress" to="textpattern" />

Some of the commonly used attributes (wraptag, class, etc) have been registered by core, so plugins don’t have to implement them anymore. But if you wish, you can override the core behavior and treat them yourself. For this, it is important to call lAtts() function somewhere inside your plugin:

bad way: $wraptag = $atts['wraptag'];
good way: extract(lAtts(array('wraptag' => ''), $atts));

This will inform the core that the plugin has its own wraptag attribute, so the global one will not be applied. Fortunately, most plugins adhere to this rule, but if yours starts to wrap its output twice, you know what to do now.

To resume, a public-side plugin:

does not need to implement wraptag, class, html_id, atts, label, labeltag and escape attributes if it treats them in the usual way;
otherwise, ensure that they are passed through lAtts() filter;
if you register a global attribute, don’t give it a txp- prefixed name, they are reserved for core;
additionally, parse(EvalElse($thing, $condition)) is deprecated, replace it with parse($thing, $condition).

I leave the eventual admin-side plugins patching with Stef and Phil. Happy coding!

Bloke · 2017-09-14 11:39:33

Thanks for the detailed info on this important topic, Oleg.

For completeness, can you please explain what happens if two plugins try to register the same attribute name, or two plugins attempt to override a core global attribute. i.e. which one wins:

When plugins are loaded from the database (earliest load order? last load order?)
When plugins are loaded from the cache directory (earliest alphabetical plugin implementation wins?)

Will the second one issue a warning that the attribute is already defined by abc_some_plugin or silently overwrite its implementation? Or are they chained? Presumably, applying the developer prefix to attributes is recommended to avoid this in most cases.

Last edited by Bloke (2017-09-14 11:41:20)

etc · 2017-09-14 12:16:08

The last loaded plugin will win without any warning, exactly as with the tags. They can not be chained (think of wraptag), but we could add a warning. Actually, we already have this problem with tags: suppose that in some plugin, <txp:child /> depends on <txp:parent />. Now, if another plugin registers <txp:parent /> tag, <txp:child /> will be still alive, but orphan. So yes,

Bloke wrote #306992:

applying the developer prefix to attributes is recommended to avoid this in most cases.

Bloke · 2017-09-14 12:54:00

Thanks for the clarification. I’m not bothered about a warning, unless you think it’ll be handy for debugging. Otherwise, anyone overriding global atts like wraptag will get a warning, when it’s actually a feature.

etc · 2017-09-14 12:56:59

Actually, some auxiliary global attributes (like class) can be shared if they are mapped to an empty value:

Txp::get('\Textpattern\Tag\Registry')->registerAttr(false, 'class');

It just suppresses the “unknown attribute” warning which otherwise would be issued if a tag has no own class attribute.

Another subtlety: if in a tag the default value of some global attribute is null, the global will apply. This allows for overridable defaults, like in

function file_download_description($atts)
{
    global $thisfile;

    assert_file();

    extract(lAtts(array(
        'escape'  => null
    ), $atts));

    if ($thisfile['description']) {
        return ($escape === null)
            ? txpspecialchars($thisfile['description'])
            : $thisfile['description'];
    }
}

ruud · 2017-09-14 17:45:11

etc wrote #306991:

if you register a global attribute, don’t give it a txp- prefixed name, they are reserved for core;

Should we, similar to plugin tag names, use our 3-char prefix for global attributes we introduce?
If so, you may want to update the examples to reflect this.

Some attributes don’t seem usable on their own, like from and to in the example. Is there a way to generate an error if a user forgets or misspells one of the required attributes in a set?

etc · 2017-09-14 20:07:01

ruud wrote #307004:

Should we, similar to plugin tag names, use our 3-char prefix for global attributes we introduce?
If so, you may want to update the examples to reflect this.

Some attributes (e.g. wraptag) are unambiguous enough, so I wouldn’t impose a prefix. Actually, a plugin can already substitute itself to a (unprefixed) core tag, hence there is no reason to forbid it for attributes.

Some attributes don’t seem usable on their own, like from and to in the example. Is there a way to generate an error if a user forgets or misspells one of the required attributes in a set?

Dunno. The problem is the same for the tags: what

<txp:abc_replace to="textpattern">
	<txp:body />
</txp:abc_replace>

means? The plugin (be it tag or attribute) will just use the default values in this case or throw an error, but catching it on processing is too expensive in loops, and the syntax parser has no idea of mandatory attributes.

We could require that plugins register their attributes with dependencies, which would be great for parser and tagbuilder. But these dependencies can be very complex, so this seems unreal. We should rather allow the plugins to modify txp_parsed tree, switching their node off if something is wrong on the first pass. Why not, any side-effects?

etc · 2017-09-22 08:49:03

Another novelty are valueless attributes, internally converted to true. By checking $attr === true condition, you can give them some special (natural) meaning. For example,

<txp:category_list exclude parent="animal" />

will be interpreted (in this case) like “output the descendants of animal category excluding animal itself”, i.e. a shortcut for

<txp:category_list exclude="animal" parent="animal" />

jakob · 2018-01-28 11:07:22

Textpattern v4.7: Making admin-side plugins multi-site compatible

From v4.7 onwards, there is a new constant ahu that holds the URL to the admin-side. This accommodates multi-site installations where the admin side is reached via an own subdomain.

The fix is easy. To ensure plugins function correctly in multi-site installations please replace all instances of:

hu.'textpattern/'.index.php …

with

ahu.index.php …

To ensure backwards compatibility with earlier Textpattern versions, you should also include the following before referencing ahu in your code:

if (!defined('ahu')) {
       define("ahu", hu.'textpattern/');
}

That’s all.

Side note: the public login cookie problem with earlier multi-site installations is now resolved. Plugins that rely on the admin-side and public-side being able to read the same login cookie (e.g. public-side login / maintenance mode plugins) should now function correctly provided the public and admin side are subdomains of the same domain.

uli · 2018-03-16 18:54:05

I’m getting a User_Error "Unknown column 'prefs_id' in 'field list'" for rss_admin_db_manager on 470 beta. I saw some plugins with that error got a fix, but I can’t find the scheme itself for that fix. Do we already have something here in the forum? Don’t recall of any.

colak · 2018-03-16 19:02:53

uli wrote #310027:

I’m getting a User_Error "Unknown column 'prefs_id' in 'field list'" for rss_admin_db_manager on 470 beta. I saw some plugins with that error got a fix, but I can’t find the scheme itself for that fix. Do we already have something here in the forum? Don’t recall of any.

Hi Uli,

Try the one below.. It appears to be working fine on my beta install.

# Name: rss_admin_db_manager v4.4 (compressed)
# Type: Admin/Public plugin
# Database management system.
# Author: Rob Sable
# URL: http://www.wilshireone.com/
# Recommended load order: 5

# .....................................................................
# This is a plugin for Textpattern CMS - http://textpattern.com/
# To install: textpattern > admin > plugins
# Paste the following text into the 'Install plugin' box:
# .....................................................................

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uli · 2018-03-16 19:12:44

Thanks, Yiannis!
Now, things are beginning to get mysterious: I’ve the same error with your version, so my suspect was I might have altered my DB or something with one of my own plugin experiments. But the only instance of the string prefs_id is inside your and my version of the rss_admin_db_manager. And that doesn’t make any sense in my mind.

EDIT: Is your version Stefs fixed plugin for Maria DBs? (Nope. Slightly different from around character 30 or so)

Textpattern CMS

Textpattern CMS support forum

#1 2017-09-14 11:22:31