HaskellWiki:Syntax highlighting

Syntax highlighting works for a bunch of languages including Haskell, using GeSHi and Jason Dagit's Haskell file, somewhat modified.

Block formatting with <haskell>

To highlight syntax of a block of Haskell, enclose it in <haskell>...</haskell>. This uses the <pre> element. For instance:

{-
My program
-}
import Prelude

foo :: (Monad m) -> m (Int,Int)
foo = (x-2,x - 1) where
  x = 3

-- The main function
main :: IO ()
main = do
  a <- foo
  putStr ("And the answer is: " ++(show (fst a))++"\n")

Question: Would it be possible to have an markup tag, say <haskell-pretty> which would utilize the <math> environment to produce neat looking things like $\operatorname {foo} ::\forall \alpha \beta .\alpha \rightarrow \beta$, corresponding to foo :: forall a b. a -> b.

Inline formatting with <hask>

To highlight syntax of inline Haskell snippets, enclose the span in <hask>...</hask>. This uses the <code> element, which is inline. For instance: import Prelude.

Inline highlighting is a bit of a hack at the moment, and may be buggy.

Styles

For Haskell (only) I have deliberately removed all formatting apart from foreground colour, and those I have tried to keep dark so as not to be visually distracting.

This is what I am trying to achieve:

• comments: grey
• keywords (including symbols): blue
• value literals: dark green
• known value identifiers (including symbols): green
• known type identifiers: red
• known classes: purple
• known modules: brown

I may also indent the entire block, similar to <blockquote>.

—Ashley Y 07:46, 10 March 2006 (UTC)

Other languages

This works for certain other languages too. For lisp, for instance, use <pre-lisp>...</pre-lisp> to format a block of lisp, and <code-lisp>...</code-lisp> to format text inline. <haskell> the same as <pre-haskell> and <hask> the same as <code-haskell>.