Note that in particular calling initTheme with and empty file does not
work anymore.
use of initLanguage was replaced by loadLanguage, which seems to work
in both places.
I tried to make it a bit more robust against missing a highlight package.
There are lots of warnings, but it no longer crashes.
Setting up a new highlighter object is slightly expensive since it
reads and parses the langfile each time. So cache them.
This also speeds up ext2langfile by avoiding it needing to check for the
existence of a language file in some cases.
format: Provide a htmlizefallback hook that other plugins can use to
handle formats that are not suitable for general-purpose htmlize hooks.
highlight: Use the hook to allow formatting of any language/extension,
without it needing to be enabled for standalone source files.
highlight: If the highlight perl binding is not available, fallback
safely to a passthrough mode.
David Bremner
Joey Hess
Joey Hess