View source for HaskellWiki:Syntax highlighting

'''Syntax highlighting''' works for a bunch of languages including Haskell, using [http://qbnz.com/highlighter/ GeSHi] and [http://web.archive.org/web/20070503183148/http://www.codersbase.com/index.php/Geshi_haskell Jason Dagit's Haskell file], somewhat modified. 

== Block formatting with <code>&lt;haskell&gt;</code> ==

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

<haskell>
{-
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")
</haskell>

== Inline formatting with <code>&lt;hask&gt;</code> ==

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

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 also indent the entire block by 2em. See [[MediaWiki:Common.css]].

&mdash;[[User:Ashley Y|Ashley Y]] 10:49, 19 March 2006 (UTC)

== Other languages ==

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