Creating and composing snaplets

In this recipe, we will create a snaplet and build the Snap application around it. We will also use the heist snaplet for serving the HTML templates. This recipe will demonstrate the following:

• How to create a snaplet
• How to use an existing snaplet inside another existing snaplet
• How the snaplet data is structured and placed
• How to access snaplet data

How to do it...

1. Create a new project, working-with-snaplets, with the simple stack template:

       stack new working-with-snaplets simple

2. Add a dependency on the snap-core library in the build-depends subsection of the executable section, as follows:

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