= Syntax Coloring of Source Code =
Trac supports language-specific syntax highlighting of source code in [wiki:WikiFormatting wiki formatted] text and the [wiki:TracBrowser repository browser].

To do this, Trac uses external libraries with support for a great number of programming languages.

Currently Trac supports syntax coloring using one or more of the following packages:

 * [http://www.codento.com/people/mtr/genscript/ GNU Enscript] 
 * [http://silvercity.sourceforge.net/ SilverCity]

To activate syntax coloring, simply install either one (or more) of these packages. No additional configuration is required, however to modify the colors, have a look at `trac/htdocs/css/code.css`.

If you don't know why trac isnt detecting an installed library, try turning on Trac logging. It actually appears that Trac is currently broken with SilverCity. You need an older version of SilverCity. http://trac.edgewall.org/wiki/TracFaq#why-is-my-css-code-not-being-highlighted-even-though-i-have-silvercity-installed

Some people also talk about trying this out: http://trac-hacks.org/svn/tracpygmentsplugin/0.11/

When in use, Trac will automatically prioritize !SilverCity highlighting over Enscript if possible, (see note below). 

If neither package is available, Trac will display the data as plain text. 

'''Note:''' Enscript supports a greater number of languages, however !SilverCity is generally faster since it is a library and isn't executed in an external process.

=== About SilverCity ===
!SilverCity uses the lexer from [http://www.scintilla.org/ Scintilla]. Scintilla supports more languages than !SilverCity implements. If you want to add a language to !SilverCity supported by Scintilla, it's not very difficult. See [http://projects.edgewall.com/trac/wiki/SilverCityAddLanguage SilverCityAddLanguage] for some information how.


== Syntax Coloring Support ==

|| || !SilverCity || Enscript ||
|| Ada      ||   || X ||
|| Asm      ||   || X ||
|| * ASP    || X || X ||
|| * C      || X || X ||
|| * C#     ||   || X(2) ||
|| * C++    || X || X ||
|| * Java   ||   || X ||
|| Awk      ||   || X ||
|| CSS      || X ||   ||
|| Diff     ||   || X ||
|| Eiffel   ||   || X ||
|| Elisp    ||   || X ||
|| Fortran  ||   || X ||
|| Haskell  ||   || X ||
|| HTML     || X || X ||
|| IDL      ||   || X ||
|| Javascript || X || X ||
|| m4       ||   || X ||
|| Makefile ||   || X ||
|| Matlab   ||   || X ||
|| Objective-C|| || X ||
|| Pascal   ||   || X ||
|| * Perl   || X || X ||
|| * PHP    || X || X ||
|| PSP      || X ||   ||
|| Pyrex    ||   || X ||
|| * Python || X || X ||
|| * Ruby   || X || X (1) ||
|| Scheme   ||   || X ||
|| Shell    ||   || X ||
|| SQL      || X || X ||
|| Troff    ||   || X ||
|| TCL      ||   || X ||
|| Tex      ||   || X ||
|| Verilog  ||   || X ||
|| VHDL     ||   || X ||
|| Visual Basic |||| X ||
|| VRML     ||   || X ||
|| XML      || X ||  ||

''(*) Supported as inline code blocks in [wiki:WikiFormatting Wiki text] using WikiProcessors.''

''(1) Ruby highlighting is not included in the Enscript distribution.  Highlighting rules for Ruby can be obtained from: http://neugierig.org/software/ruby/

''(2) C# highlighting is not included in the Enscript distribution.  Highlighting rules for C# can be obtained from: http://wiki.hasno.info/index.php/Csharp.st

== Extra Software ==
 * GNU Enscript -- http://directory.fsf.org/GNU/enscript.html
 * GNU Enscript for Windows -- http://gnuwin32.sourceforge.net/packages/enscript.htm
 * !SilverCity -- http://silvercity.sf.net/

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See also: WikiProcessors, WikiFormatting, TracWiki, TracBrowser