nix build, builds scaffolding succesfully

src/Settings/StaticFiles.hs

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+{-# LANGUAGE NoImplicitPrelude #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TemplateHaskell   #-}
+module Settings.StaticFiles where
+
+import Settings     (appStaticDir, compileTimeAppSettings)
+import Yesod.Static (staticFiles)
+
+-- This generates easy references to files in the static directory at compile time,
+-- giving you compile-time verification that referenced files exist.
+-- Warning: any files added to your static directory during run-time can't be
+-- accessed this way. You'll have to use their FilePath or URL to access them.
+--
+-- For example, to refer to @static/js/script.js@ via an identifier, you'd use:
+--
+--     js_script_js
+--
+-- If the identifier is not available, you may use:
+--
+--     StaticFile ["js", "script.js"] []
+staticFiles (appStaticDir compileTimeAppSettings)
+
+-- If you prefer to updating the references by force
+--  -- especially when you are devloping like `stack exec -- yesod devel` --
+-- you can update references by chaning file stamp.
+--
+-- On linux or Unix-like system, you can use
+--     shell> touch /Path/To/Settings/StaticFiles.hs
+--
+-- or save without changes on your favorite editor.
+-- so yesod devel will re-compile automatically and generate the refereces
+-- including new one.
+--
+-- In this way you can use on your shakespearean template(s)
+-- Let's say you have image on "yourStaticDir/img/background-1.jpg"
+-- you can use the reference of the file on shakespearean templates like bellow
+--
+--     /* note: `-' becomes '_' as well */
+--     @{StaticR img_background_1_jpg}