DPL Example 017

Create a permuted index of template calls

Sometimes you want to know, which pages use a certain template with a special value. If you know the value you are interested in, you can use includematch.

If you want a complete listing of all parameter values and the pages that are using them you can build a permuted index. (Note: The category system of MediaWiki is also a permuted index). If a page uses more than one value it will appear in the result more than once. If several pages use the same value they will be listed below that value.

In our example we have created two pages which use a template called Index with one or more parameters:

• Test inx Fruit  1 = apples      2 = walnuts   
• Test inx Nuts  1 = almonds      2 = hazelnuts      3 = walnuts   

In our example the template Index does nothing; it could, however, tell the reader, that this page belongs to a certain index group - just like mediawiki lists the categories of a page at the bottom of your wiki browser. The surrogate template we use in the DPL query constructs an Array which is sorted and printed afterwards. The result looks like this: {{#arraydefine:inx|

 {{#replace:
   apples°Test inx Fruit

walnuts°Test inx Fruit;almonds°Test inx Nuts

hazelnuts°Test inx Nuts

walnuts°Test inx Nuts;

   |/;$/
   |
 }}

|;}} {{#arraysort:inx|asce}}{{#arrayprint:inx|
|%%|{{#vardefine:src|{{#replace:%%|/°.*/|}}}} {{#var:src}}
{{#replace:%%|/^(\[\[){{#var:src}}°/|     \1}}{{#vardefine:srcold|{{#var:src}}}}}}