Data.String.Interpolate.Util

Documentation

unindent :: String -> String

Remove indentation as much as possible while preserving relative indentation levels.

unindent is useful in combination with i to remove leading spaces that resulted from code indentation. That way you can freely indent your string literals without the indentation ending up in the resulting strings.

Here is an example:

>>> :set -XQuasiQuotes
>>> import Data.String.Interpolate
>>> import Data.String.Interpolate.Util
>>> :{
 putStr $ unindent [i|
     def foo
       23
     end
   |]
:}
def foo
  23
end

To allow this, two additional things are being done, apart from removing indentation:

• One empty line at the beginning will be removed and
• if the last newline character ("\n") is followed by spaces, the spaces are removed.