never executed always true always false

    1 module Reanimate.Driver.Magick
    2   ( magickCmd
    3   ) where
    4 
    5 import System.IO.Unsafe (unsafePerformIO)
    6 import System.Directory (findExecutable)
    7 
    8 -- |The name of the ImageMagick command. On Unix-like operating systems, the
    9 -- command \'convert\' does not conflict with the name of other commands. On
   10 -- Windows, ImageMagick version 7 is readily available, the command \'magick\'
   11 -- should be present, and is preferred over \'convert\'. If it is not present,
   12 -- \'convert\' is assumed to be the relevant command.
   13 magickCmd :: String
   14 -- The use of 'unsafeperformIO' is justified on the basis that if \'magick\' is
   15 -- found once, it will always be present.
   16 magickCmd = unsafePerformIO $ do
   17   mPath <- findExecutable "magick"
   18   pure $ maybe "convert" (const "magick") mPath