Implementation of interpolated multiline strings https://github.com/unclechu/haskell-qm-interpolated-string

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PublicDomain licensed by Viacheslav Lotsmanov
Maintained by Viacheslav Lotsmanov


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Implementation of interpolated multiline string QuasiQuoter that ignores indentation and trailing whitespaces.

Actually it's modification of interpolatedstring-perl6 package. I used it to implemenent my own strings I really like.

This implementation looks just like qc from interpolatedstring-perl6 package but ignores any indentation, line breaks (except explicitly written using \n char) and trailing whitespaces.

'm' in 'qm' means 'multiline'.

You could write a decoratively formatted string and your decorative indentation and line breaks wont go to the string, but when you really need it, you could just escape it using backslash.

Simple usage example

{-# LANGUAGE QuasiQuotes #-}

import Text.InterpolatedString.QM (qm)

main :: IO ()
main = putStrLn [qm| hello
                   \ world |]

More examples

[qm|   hello world,
     \ what's going on here?  |]
-- Result: "hello world, what's going on here?"
      it's actual
      ly ignored
-- Result: "it's actually ignored"
[qm|  \  You could explicitly escape indentation or\n
         line-breaks when you really need it!  \
-- Result: "  You could explicitly escape indentation or\nline-breaks when you really need it!  "
[qm| {1+2} \{3+4} |]
-- Result: "3 {3+4}"

There is also very similar to qm QuasiQuoter named as qn that do the same except interpolation:

[qn| foo {1+2} |]
-- Result: "foo {1+2}"


Viacheslav Lotsmanov


The Unlicense


  • Added qn QuasiQuoter as alternative to qm but without interpolation
  • Some code refactoring
  • More docs and tests
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