Original project: http://code.google.com/p/qlcolorcode/

This is a Quick Look plugin that renders source code with syntax highlighting, using the Highlight library.

To install the plugin, just drag it to ~/Library/QuickLook. You may need to create that folder if it doesn't already exist.

Alternative, if you use Homebrew-Cask, install with brew cask install qlcolorcode.

If you want to configure QLColorCode, there are several defaults commands that could be useful:

Setting the text encoding (default is UTF-8). Two settings are required. The first sets Highlight's encoding, the second sets Webkit's:

defaults write org.n8gray.QLColorCode textEncoding UTF-16
defaults write org.n8gray.QLColorCode webkitTextEncoding UTF-16

Setting the font (default is Menlo):

defaults write org.n8gray.QLColorCode font Monaco

Setting the font size (default is 10):

defaults write org.n8gray.QLColorCode fontSizePoints 9

Setting the color style (default is edit-xcode, see all available themes):

defaults write org.n8gray.QLColorCode hlTheme ide-xcode

Setting the thumbnail color style (deactivated by default):

defaults write org.n8gray.QLColorCode hlThumbTheme ide-xcode

Setting the maximum size (in bytes, deactivated by default) for previewed files:

defaults write org.n8gray.QLColorCode maxFileSize 1000000

Setting any extra command-line flags for Highlight (see below):

defaults write org.n8gray.QLColorCode extraHLFlags '-l -W'

Here are some useful 'highlight' command-line flags (from the man page):

   -F, --reformat=<style>
          reformat output in given style.   <style>=[ansi,  gnu,  kr,
          java, linux]

   -J, --line-length=<num>
          line length before wrapping (see -W, -V)

   -j, --line-number-length=<num>
          line number length incl. left padding

   -l, --linenumbers
          print line numbers in output file

   -t  --replace-tabs=<num>
          replace tabs by num spaces

   -V, --wrap-simple
          wrap long lines without indenting function  parameters  and
          statements

   -W, --wrap
          wrap long lines

   -z, --zeroes
          fill leading space of line numbers with zeroes

   --kw-case=<upper|lower|capitalize>
          control case of case insensitive keywords

Warning: my fork uses an external Highlight. It will attempt to find highlight on your PATH (so it should work out of the box for homebrew and MacPorts), but if it can't find it, it'll use /opt/local/bin/highlight (MacPorts default). This can be changed:

defaults write org.n8gray.QLColorCode pathHL /path/to/your/highlight

QLColorCode decompiles some formats:

• Java class. It requires jad installed at /usr/local/bin/jad.
• Compiled AppleScript. It requires osadecompile installed at /usr/bin/osadecompile.
• Binary PLIST. It requires plutil installed at /usr/bin/plutil.

QLColorCode enables some Highlight plugins :

• In all languages: outhtml_modern_fonts and outhtml_codefold.
• Java (sources and classes): java_library.
• C/C++: cpp_syslog, cpp_ref_cplusplus_com and cpp_ref_local_includes.
• Perl: perl_ref_perl_org.
• Python: python_ref_python_org.
• Shell: bash_functions.
• Scala: scala_ref_scala_lang_org.

Highlight can handle lots and lots of languages, but this plugin will only be invoked for file types that the OS knows are type "source-code". Since the OS only knows about a limited number of languages, I've added Universal Type Identifier (UTI) declarations for several "interesting" languages. If I've missed your favorite language, take a look at the Info.plist file inside the plugin bundle and look for the UTImportedTypeDeclarations section. I haven't added all the languages that Highlight can handle because it's rumored that having two conflicting UTI declarations for the same file extension can cause problems. Note that if you do edit the Info.plist file you need to nudge the system to tell it something has changed. Moving the plugin to the desktop then back to its installed location should do the trick.

As an aside, by changing colorize.sh you can use this plugin to render any file type that you can convert to HTML. Have fun, and let me know if you do anything cool!