Haskell Cookbook

How to do it...

1. Create a new project, working-with-heist, with a simple stack template.

        stack new working-with-heist simple

2. Add a dependency on the heist library in the build-depends sub-section of the executable section:

 executable working-with-heist
   hs-source-dirs:      src
   main-is:             Main.hs
   default-language:    Haskell2010
   build-depends:       base >= 4.7 && < 5
                      , heist                      , text                      , bytestring                      , lens                      , xmlhtml

3. The heist library does not exist in the stackage LTS. Thus, we need to run the following command to update the dependencies automatically:

        stack solver --update-config

4. Open src/Main.hs. We will be adding our source here. Enable the OverloadedStrings extension, and define the Main module:

 {-# LANGUAGE OverloadedStrings #-}
 module Main ...