( renderLazy sdoc) takes the output sdoc from a rendering function and transforms it to lazy text.

>>> let render = TL.putStrLn . renderLazy . layoutPretty defaultLayoutOptions
>>> let doc = "lorem" <+> align (vsep ["ipsum dolor", parens "foo bar", "sit amet"])
>>> render doc
lorem ipsum dolor
      (foo bar)
      sit amet

( renderStrict sdoc) takes the output sdoc from a rendering function and transforms it to strict text.

( renderIO h sdoc) writes sdoc to the file h .

>>> renderIO System.IO.stdout (layoutPretty defaultLayoutOptions "hello\nworld")
hello
world

This function is more efficient than hPutStr h ( renderStrict sdoc) , since it writes to the handle directly, skipping the intermediate Text representation.

( putDoc doc) prettyprints document doc to standard output. Uses the defaultLayoutOptions .

>>> putDoc ("hello" <+> "world")
hello world

putDoc = hPutDoc stdout

Like putDoc , but instead of using stdout , print to a user-provided handle, e.g. a file or a socket. Uses the defaultLayoutOptions .

main = withFile filename (h -> hPutDoc h doc)
  where
    doc = vcat ["vertical", "text"]
    filename = "someFile.txt"

hPutDoc h doc = renderIO h (layoutPretty defaultLayoutOptions doc)