• View
• Edit
• History
• Print
• Backlinks

Categories-Talk

This is a talk page for improving Categories.

For "Catergories Just Don't Work"!

If you are driving yourself crazy trying to introduce Categories on an existing site, try deleting wiki.d/.pageindex . This wiil do no harm; the index will be regenerated. This also may help other apparently inexplicable failures. .pageindex can get out of sync from a variety of situations from klutzy admin to filesystem disaster.

Using the Auto Created Pages

If you enable the auto creation of the category pages you can use them to display links to pages which belong to that category.

Add these two lines to your local config.php.

$page = ReadPage('Category.GroupTemplate', READPAGE_CURRENT);
$AutoCreate['/^Category\\./'] = array('ctime' => $Now, 'text' => $page['text']);

Then navigate to the Category.GroupTemplate page (which will create a new page) and edit that page to include:

Every time a category page is autocreated it will have the content you placed in the GroupTemplate. Each category page will display a linked list of pages in that category. This places the list in the body of the page rather than in the footer.

Q: Is there any way to take tag name to AutoCreate's 'text' field so in the end I can have page Category.AlternativeWorld with title "Alternative world" (as it's written in the tag, second word's first letter is small as opposed to $Titlespaced) for example?

Distinguishing between defining and referencing a category

Unfortunately PmWiki cannot distinguish between defining a category (or tagging a page)^{[1] [2]}, normally done like this

and referring to a category, via

Invisible category links

• Invisible category links are possible, use %comment% [[!SomeCategory]]
• Administrators can create a %category% style to control whether or not to display category links: either %define=category comment% or else $WikiStyle['category']['display'] = 'none';

How to list categories used on any given page

• In order to list the categories of a given page (or even a list of pages), a PageVariable can be set in config.php

• Alternatively {(catlist)} or {(categorylist)} markup expressions could also be used.

There is a mailing list thread where this matter is better explained and referenced.

- Is it possible, somehow, to merge two (or more) categories, after they have been created?
For example. I have a category named "Thriller", and a category named "Comedy".
Can I create a new category named "Movies", that will automatically list all pages in "Thriller" and "Comedy",
without having to write [[!Movies]], in every single of those pages?
Of course, I can place [[!Movies]] in these two categories,
but that would just list "Category.Thriller" and "Category.Comedy" links.
Likewise, a redirect link won't do...