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open IO FS System FilePath
def trimEnds (s : String) : String :=
(s.split (· == '\n')).map (·.dropRightWhile (· == ' ')) |> String.intercalate "\n"
def main (args : List String) : IO Unit :=
match args with
| [] => println "No root directory provided!"
| d :: _ =>
for fp in ← walkDir d do
if fp.extension == some "lean" then
let text ← readFile fp
writeFile fp (trimEnds text)
