Trac supports language-specific syntax highlighting of source code in [wiki:WikiFormatting wiki formatted] text and the [wiki:TracBrowser repository browser].
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To do this, Trac uses external libraries with support for a great number of programming languages.
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Currently Trac supports syntax coloring using one or more of the following packages:
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* [http://people.ssh.fi/mtr/genscript/ GNU Enscript]
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* [http://silvercity.sourceforge.net/ SilverCity]
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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`.
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When in use, Trac will automatically prioritize !SilverCity highlighting over Enscript if possible, (see note below).
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If neither package is available, Trac will display the data as plain text.
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'''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.
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=== About SilverCity ===
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!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.
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== Syntax Coloring Support ==
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|| || !SilverCity || Enscript ||
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|| Ada || || X ||
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|| Asm || || X ||
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|| * ASP || X || X ||
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|| * C || X || X ||
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|| * C++ || X || X ||
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|| * Java || || X ||
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|| Awk || || X ||
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|| CSS || X || ||
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|| Diff || || X ||
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|| Eiffel || || X ||
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|| Elisp || || X ||
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|| Fortran || || X ||
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|| Haskell || || X ||
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|| HTML || X || X ||
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|| IDL || || X ||
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|| Javascript || X || X ||
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|| m4 || || X ||
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|| Makefile || || X ||
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|| Matlab || || X ||
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|| Objective-C|| || X ||
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|| Pascal || || X ||
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|| * Perl || X || X ||
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|| * PHP || X || X ||
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|| PSP || X || ||
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|| Pyrex || || X ||
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|| * Python || X || X ||
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|| * Ruby || X || X (1) ||
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|| Scheme || || X ||
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|| Shell || || X ||
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|| SQL || X || X ||
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|| Troff || || X ||
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|| TCL || || X ||
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|| Tex || || X ||
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|| Verilog || || X ||
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|| VHDL || || X ||
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|| Visual Basic |||| X ||
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|| VRML || || X ||
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|| XML || X || X ||
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''(*) Supported as inline code blocks in [wiki:WikiFormatting Wiki text] using WikiProcessors.''
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''(1) Ruby highlighting is not included in the Enscript distribution. Highlighting rules for Ruby can be obtained from: http://neugierig.org/software/ruby/
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== Extra Software ==
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* GNU Enscript -- http://people.ssh.fi/mtr/genscript/
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* !SilverCity -- http://silvercity.sf.net/
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----
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See also: WikiProcessors, WikiFormatting, TracWiki, TracBrowser