[web-devel] A light-weight web framework

Thu Mar 29 23:12:57 EDT 2007

I'm interested in seeing something like this too. However, I am a big  
fan of DSL, especially if they're designed correctly. The crux to  
having a good DSL is thinking: "How do I *really* want to write  
this?", and starting from there on. I haven't really thought about  
those things for a web-framework yet.

-chris

On Mar 29, 2007, at 10:48 AM, Johan Tibell wrote:

> Inspired by the ease with which Joe Gregorio put together a framework
> in Python using some components [1] I'm inspired to create some
> components of my own so the same thing can be done in Haskell. I'm
> aiming for creating some thing /really/ simple and I want to start
> with writing a templating system or a database wrapper. But first,
> what has been done in this area already already? I'm aware of at least
> some template like efforts [2]. For the templating system I don't
> think I want a DSL like approach (ala Lisp with (body (h1 "Foo")) etc.
> but rather a solution where code and templates are kept separate.
> Here's a really simple interface.
>
> compileTemplate :: Stringable a => a -> Template
> renderTemplate :: (Show a, Stringable b) => Template -> Map  
> Stringable a -> b
>
> Or something along those lines. Compiling the template makes
> subsequent rendering faster and ByteString adds even more speed.
>
> With some templating language like so:
>
> <html>
> <head>...</head>
> <body>
>   <h1>{{ title }}</h1>
> </body>
> </html>
>
> 'title' is looked up in the Map when the template is rendered. The
> other option would be inline Haskell code:
>
> <html>
> <head>...</head>
> <body>
>   <h1><% postTitle title %></h1>
> </body>
> </html>
>
> Where 'title' is a record data type. There's also a middle ground like
> with Django's templates that supports restricted inline code. I guess
> the restriction is unnecessary in Haskell as we can disallow mutation
> of values quite easily (?).
>
> 1. http://bitworking.org/news/Why_so_many_Python_web_frameworks
> 2. http://blog.moertel.com/articles/2006/10/18/a-type-based- 
> solution-to-the-strings-problem
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