Syntax Coloring of Source Code

Trac supports language-specific syntax highlighting of source code in wiki formatted text and the 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:

• ​GNU Enscript
• ​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.

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 ​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 ​SilverCityAddLanguage for some information how.

Syntax Coloring Support

	SilverCity	Enscript
Ada		X
Asm		X
* ASP	X	X
* C	X	X
* 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	X

(*) Supported as inline code blocks in 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/

Extra Software

• GNU Enscript -- ​http://people.ssh.fi/mtr/genscript/
• SilverCity -- ​http://silvercity.sf.net/

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See also: WikiProcessors, WikiFormatting, TracWiki, TracBrowser