GNU Source-highlight produces a document with
syntax highlighting when given a source file. It
handles many languages, e.g., Java, C/C++, Prolog,
Perl, PHP3, Python, Flex, HTML, and other formats,
e.g., ChangeLog and log files, as source languages
and HTML, XHTML, DocBook, ANSI color escapes, LaTeX, and
Texinfo as output formats. Input and output
formats can be specified with a regular
expression-oriented syntax.