sebfisch

Comparing Snap's and Yesod's Template Languages Heist and Hamlet - and HSP

Currently, Snap and Yesod are the two most active web frameworks for Haskell. In this document, I compare the template languages used by those frameworks for generating HTML.

Both template languages let programmers write markup directly in a markup language rather than generating it from within Haskell. Compared with static HMTL, template languages support substitution to dynamically determine parts of the content of the generated page.

[Heist] and [Hamlet] support different constructs to generate content dynamically. They also differ regarding their syntax for static content.

mscharley

/* Note, this is only for library interop code. This is *not* a good way to do things in pure Reason code. */

module type GeneratorType {
  type value('a);
  type t('a);
  type fn('a) = unit => t('a);
  
  let valueGet: value('a) => option('a);
  let doneGet: value('a) => bool;