= Wiki Processors =
Processors are [TracWikiMacros wiki macros] designed to provide alternative markup formats for the [TracWiki Wiki engine]. Processors can be thought of as ''macro functions to process user-edited text''.
The Wiki engine uses processors to allow using [wiki:WikiRestructuredText Restructured Text], [wiki:WikiHtml raw HTML] and [http://www.textism.com/tools/textile/ 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
{{{
#!html
<h1 style="color: orange">This is raw HTML</h1>
}}}
}}}
'''Results in:'''
{{{
#!html
This is raw HTML
}}}
----
'''Example 2''' (''inserting Restructured Text in wiki text''):
{{{
#!html
{{{
#!rst
A header
--------
This is some **text** with a footnote [*]_.
.. [*] This is the footnote.
}}}
}}}
'''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
{{{
#!c
int main(int argc, char *argv[])
{
printf("Hello World\n");
return 0;
}
}}}
}}}
'''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 [http://dealmeida.net/projects/textile/ Textile] is installed. See [http://hobix.com/textile/ 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).
Textile link above is rotten. [http://www.textism.com/tools/textile/ this one] works, allows to test example. To install, download from [http://cheeseshop.python.org/pypi/textile] and run `python setup.py install`.
=== Code Highlighting Support ===
Trac includes processors to provide inline [wiki:TracSyntaxColoring syntax highlighting] for the following languages:
* '''c''' -- C
* '''cpp''' -- C++
* '''python''' -- Python
* '''perl''' -- Perl
* '''ruby''' -- Ruby
* '''php''' -- PHP
* '''asp''' --- ASP
* '''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
text
}}}
}}}
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:
* [http://trac.edgewall.org/wiki/ProcessorBazaar ProcessorBazaar]
* [http://trac.edgewall.org/wiki/MacroBazaar MacroBazaar]
== Advanced Topics: Developing Processor Macros ==
Developing processors is no different from [TracWikiMacros wiki macros]. In fact they work the same way, only the usage syntax differs.
'''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('')+6:html.find('')].strip()
}}}
----
See also: TracWikiMacros, WikiHtml, WikiRestructuredText, TracSyntaxColoring, WikiFormatting, TracGuide