Using html files as templates in happstack
I can find plenty of documentati开发者_如何学Con on using blitz and other compiletime templating libraries with happstack but I would like to know how to use html files as templates.
Though there are many options, my favourite would be Heist, which would allow you to define a splice:
> factSplice :: (Monad m) => TemplateMonad m Template
> factSplice = do
> input <- getParamNode
> let text = T.unpack $ X.nodeText input
> n = read text :: Int
> return [X.TextNode $ T.pack $ show $ product [1..n]]
>
which could be used in a dynamic (loaded at runtime) HTML template:
<html>
<head>
<title>Factorial Page</title>
</head>
<body>
<h1>Factorial Page</h1>
<p>The factorial of 6 is <fact>6</fact></p>
</body>
</html>
To use heist in happstack, you'll need the happstack-heist package. For more detail and other options, see Using Heist.
The HStringTemplate package provides a very general runtime templating system for not only HTML, but any sort of text output:
http://hackage.haskell.org/packages/archive/HStringTemplate/0.6.6/doc/html/Text-StringTemplate.html
The HStringTemplate package integrates with Happstack nicely through a few extra instances provided by an optional package: http://hackage.haskell.org/package/happstack-hstringtemplate
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