Hamlet Demo <body> <h1>Information on #{string (name person)} <p>#{string (name person)} is #{string (age person)} years old. <h2> $if isMarried person \Married $else \Not married <ul> $forall child <- children person <li>#{string child} <p> <a href="@{page person}">See the page. \^{footer} |] main :: IO () main = do let person = Person { name = "Michael" , age = "twenty five & a half" , page = PersonPage "michael" , isMarried = True , children = ["Adam", "Ben", "Chris"] } L.putStrLn $ renderHamlet renderUrls $ template person \end{code} Outputs (new lines added for readability): <code><pre> <!DOCTYPE html> <html><head><title>Hamlet Demo</title></head><body> <h1>Information on Michael</h1> <p>Michael is twenty five & a half years old.</p> <h2>Married</h2> <ul><li>Adam</li><li>Ben</li><li>Chris</li></ul> <p><a href="/michael">See the page.</a></p> <div id="footer">Thank you, come again</div> </body></html> </pre></code>

\begin{code} {-# LANGUAGE QuasiQuotes #-} import Text.Hamlet import qualified Data.ByteString.Lazy as L data Person = Person { name :: String , age :: String , page :: PersonUrls , isMarried :: Bool , children :: [String] } data PersonUrls = Homepage | PersonPage String renderUrls :: PersonUrls -> [(String, String)] -> String renderUrls Homepage _ = "/" renderUrls (PersonPage name) _ = '/' : name footer :: Hamlet url footer = [$hamlet|\

Thank you, come again |] template :: Person -> Hamlet PersonUrls template person = [$hamlet| !!! Hamlet Demo <body> <h1>Information on #{string (name person)} <p>#{string (name person)} is #{string (age person)} years old. <h2> $if isMarried person \Married $else \Not married <ul> $forall child <- children person <li>#{string child} <p> <a href="@{page person}">See the page. \^{footer} |] main :: IO () main = do let person = Person { name = "Michael" , age = "twenty five & a half" , page = PersonPage "michael" , isMarried = True , children = ["Adam", "Ben", "Chris"] } L.putStrLn $ renderHamlet renderUrls $ template person \end{code} Outputs (new lines added for readability): <code><pre> <!DOCTYPE html> <html><head><title>Hamlet Demo</title></head><body> <h1>Information on Michael</h1> <p>Michael is twenty five & a half years old.</p> <h2>Married</h2> <ul><li>Adam</li><li>Ben</li><li>Chris</li></ul> <p><a href="/michael">See the page.</a></p> <div id="footer">Thank you, come again</div> </body></html> </pre></code>