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):

{{{
#!html
<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).

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Example 2 (inserting Restructured Text in wiki text):

{{{
#!rst
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.

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

{{{
#!c
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;
}

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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 - not in the rendered page).

Code Highlighting Support

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

• c -- C
• cpp -- C++
• python -- Python
• perl -- Perl
• ruby -- Ruby
• php -- PHP
• asp -- ASP
• java -- Java
• js -- Javascript
• sql -- SQL
• xml -- XML
• sh -- Bourne/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:

{{{
#!text/html
<h1>text</h1>
}}}

The result will be syntax highlighted HTML code:

<h1>text</h1>

The same is valid for all other mime types supported.

For more processor macros developed and/or contributed by users, visit:

• trac:ProcessorBazaar
• trac:MacroBazaar
• [th:WikiStart 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.

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