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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
<pre class="wiki"><code>
#!html
&lt;h1 style="color: orange"&gt;This is raw HTML&lt;/h1&gt;

</pre> </code>

Results in:

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

Example 2 (inserting Restructured Text in wiki text):

#!html
<pre class="wiki"><code>
#!rst
A header
--------
This is some **text** with a footnote [[:*]]_.

.. [[:*]] This is the footnote.

</pre> </code>

Results in:

#!rst
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):

#!html
<pre class="wiki"><code>
#!c
int main(int argc, char *argv[])
{
  printf("Hello World\n");
  return 0;
}

</pre> </code>

Results in:

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

Available Processors

The following processors are included in the Trac distribution:

  • html – Insert custom HTML in a wiki page. See WikiHtml.
  • rst – Trac support for Restructured Text. See WikiRestructuredText.
  • textile – Supported if Textile is installed. See a Textile reference.

Textile link above is rotten. this one works, allows to test example.

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
  • sql – SQL
  • xml – XML

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:

<code>
#!text/html
<h1>text</h1>

</code>

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:

Advanced Topics: Developing Processor Macros

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

Example: (Restructured Text Processor):

#!python
from docutils.core import publish_string

def execute(hdf, text, env):
    html = publish_string(text, writer_name = 'html')
    return html[[:html.find('<body>')+6:html.find('<:body>')]].strip()

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

wikiprocessors.txt · Last modified: 2015/06/09 15:23 (external edit)