Edgewall Software

This page documents the 0.11 release. Documentation for other releases can be found here.

Wiki Processors

Processors are WikiMacros designed to provide alternative markup formats for the Wiki engine. Processors can be thought of as macro functions to process user-edited text.

The Wiki engine uses processors to allow using Restructured Text, raw HTML and textile in any Wiki text throughout Trac.

Using Processors

To use a processor on a block of text, use a Wiki code block, selecting a processor by name using shebang notation (#!), familiar to most UNIX users from scripts.

Example 1 (inserting raw HTML in a wiki text):

<h1 style="color: orange">This is raw HTML</h1>

Results in:

This is raw HTML

Note that since 0.11, such blocks of HTML have to be self-contained, i.e. you can't start an HTML element in one block and close it later in a second block. Use div or span processors for achieving similar effect (see WikiHtml).

Example 2 (inserting Restructured Text in wiki text):

A header
This is some **text** with a footnote [*]_.

.. [*] This is the footnote.

Results in:

A header

This is some text with a footnote [*].

[*]This is the footnote.

Example 3 (inserting a block of C source code in wiki text):

int main(int argc, char *argv[])
  printf("Hello World\n");
  return 0;

Results in:

int main(int argc, char *argv[])
  printf("Hello World\n");
  return 0;

Example 4 (Searching from a wiki page by custom field. Allows user to reuse most common searches on a wiki page):

<form action="/query" method="get">
<input type="text" name="keywords" value="~" size="30"> <input type="submit" value="Search by Keywords#">
<!-- To control what fields show up use hidden fields
<input type="hidden" name="col" value="id">
<input type="hidden" name="col" value="summary">
<input type="hidden" name="col" value="status">
<input type="hidden" name="col" value="milestone">
<input type="hidden" name="col" value="version">
<input type="hidden" name="col" value="owner">
<input type="hidden" name="col" value="priority">
<input type="hidden" name="col" value="component">


Available Processors

The following processors are included in the Trac distribution:

  • html — Insert custom HTML in a wiki page. See WikiHtml.
  • div — Wrap an arbitrary Wiki content in a <div> element (since 0.11). See WikiHtml.
  • span — Wrap an arbitrary Wiki content in a <span> element (since 0.11). See also WikiHtml.
  • rst — Trac support for Restructured Text. See WikiRestructuredText.
  • textile — Supported if Textile is installed. See a Textile reference.
  • comment — Do not process the text in this section (i.e. contents exist only in the plain text that can be viewed when editing the wiki page content - not in the rendered page).
  • diff — Pretty print patches and diffs.

Code Highlighting Support

Trac includes processors to provide inline syntax highlighting for the following languages:

  • c — C
  • cpp — C++
  • csharp —- C#
  • python — Python
  • perl — Perl
  • ruby — Ruby
  • php — PHP
  • asp — ASP
  • java — Java
  • js — Javascript
  • sql — SQL
  • xml — XML
  • shBourne/Bash shell

Note: Trac relies on external software packages for syntax coloring. See TracSyntaxColoring for more info.

By using the MIME type as processor, it is possible to syntax-highlight the same languages that are supported when browsing source code. For example, you can write:


The result will be syntax highlighted HTML code:


The same is valid for all other mime types supported.

For more processor macros developed and/or contributed by users, visit the Trac Hacks community site.

Advanced Topics: Developing Processor Macros

Developing processors is no different from Wiki macros. In fact they work the same way, only the usage syntax differs. See WikiMacros for more information.

See also: WikiMacros, WikiHtml, WikiRestructuredText, TracSyntaxColoring, WikiFormatting, TracGuide

Last modified 7 years ago Last modified on Feb 9, 2015, 4:16:12 AM
Note: See TracWiki for help on using the wiki.