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[[!template id=plugin name=pedigree author="intrigeri"]]
[[!tag type/useful]]
This plugin offers a `HTML::Template` loop that iterates over all or
a subset of a page's parents, providing a few bonus possibilities,
such as styling the parent links depending on their place in the path.
One can think of pedigree as "`PARENTLINKS` on steroids".
[[!toc ]]
Content
=======
This plugin provides one template loop, called `PEDIGREE`, that
returns the same parents list as `PARENTLINKS` would; as a bonus,
every path element returned by the `PEDIGREE` loop has the following
variables set:
* `URL` (string): url to the current path element
* `PAGE` (string): title of the current path element
* `DEPTH` (positive integer): depth of the path leading to the
current path element, counting from the wiki's root, which has
`DEPTH=0`
* `HEIGHT` (positive integer): distance, expressed in path elements,
from the current page to the current path element; e.g. this is
1 for the current page's mother, 2 for its grand-mother, etc.
* `DEPTH_n` (boolean): true if, and only if, `DEPTH==n`
* `HEIGHT_n` (boolean): true if, and only if, `HEIGHT==n`
Usage
=====
The `DEPTH_n` and `HEIGHT_n` variables allow the template writer to
skip arbitrary elements in the parents list: they are arbitrary
page-range selectors.
The `DEPTH` and `HEIGHT` variables allow the template writer to apply
general treatment, depending on one of these variables, to *every*
parent: they are counters.
Styling parents depending on their depth
----------------------------------------
Say you want the parent links to be styled depending on their depth in
the path going from the wiki root to the current page; just add the
following lines in `page.tmpl`:
<TMPL_LOOP NAME="PEDIGREE">
<a href="<TMPL_VAR NAME="URL">" class="depth<TMPL_VAR NAME="DEPTH">">
<TMPL_VAR NAME="PAGE">
</a> /
</TMPL_LOOP>
Then write the appropriate CSS bits for `a.depth1`, etc.
Skip some parents, style the others depending on their distance to the current page
-----------------------------------------------------------------------------------
Say you want to display all the parents links but the wiki homepage,
styled depending on their distance to the current page; just add the
following lines in `page.tmpl`:
<TMPL_LOOP NAME="PEDIGREE">
<TMPL_IF NAME="DEPTH_0">
<TMPL_ELSE>
<a href="<TMPL_VAR NAME="URL">" class="height<TMPL_VAR NAME="HEIGHT">">
<TMPL_VAR NAME="PAGE">
</a> /
</TMPL_LOOP>
Then write the appropriate CSS bits for `a.height1`, etc.
Full-blown example
------------------
Let's have a look at a more complicated example; combining the boolean
loop variables provided by this plugin (`IS_ROOT` and friends) and
`HTML::Template` flow control structures, you can have custom HTML
and/or CSS generated for some special path components; e.g.:
<!-- all parents, skipping mother and grand'ma, inside a common div+ul -->
<div id="oldestparents">
<ul>
<TMPL_LOOP NAME="PEDIGREE">
<TMPL_IF NAME="HEIGHT_2">
<TMPL_ELSE>
<TMPL_IF NAME="HEIGHT_1">
<TMPL_ELSE>
<li><a href="<TMPL_VAR NAME="URL">"><TMPL_VAR NAME="PAGE"></a></li>
</TMPL_IF>
</TMPL_IF>
</TMPL_LOOP>
</ul>
</div>
<!-- dedicated div's for mother and grand'ma -->
<TMPL_LOOP NAME="PEDIGREE">
<TMPL_IF NAME="HEIGHT_2">
<div id="grandma">
<a href="<TMPL_VAR NAME="URL">"><TMPL_VAR NAME="PAGE"></a>
</div>
<TMPL_ELSE>
<TMPL_IF NAME="HEIGHT_1">
<div id="mother">
<a href="<TMPL_VAR NAME="URL">"><TMPL_VAR NAME="PAGE"></a>
</div>
</TMPL_IF>
</TMPL_IF>
</TMPL_LOOP>
<!-- eventually, the current page title -->
<TMPL_VAR NAME="TITLE">
</div>
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