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Haskell Cookbook by Yogesh Sajanikar

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How to do it...

  1. Create a new project, working-with-heist, with a simple stack template.
        stack new working-with-heist simple
  1. 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
  1. 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
  1. Open src/Main.hs. We will be adding our source here. Enable the OverloadedStrings extension, and define the Main module:
 {-# LANGUAGE OverloadedStrings #-}
 module Main ...

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