18 lines
568 B
Text
18 lines
568 B
Text
prelude
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import Init.System.IO
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open IO.FS
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def usingIO {α} (x : IO α) : IO α := x
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#eval (discard $ IO.FS.Handle.mk "non-existent-file.txt" Mode.read : IO Unit)
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#eval usingIO do
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if (← IO.fileExists "readonly.txt") then pure ()
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else
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IO.FS.withFile "readonly.txt" Mode.write $ fun _ => pure ()
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IO.setAccessRights "readonly.txt" { user := { read := true } };
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pure ()
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#eval (discard $ IO.FS.Handle.mk "readonly.txt" Mode.write : IO Unit)
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#eval usingIO do
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let h ← IO.FS.Handle.mk "readonly.txt" Mode.read;
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h.putStr "foo";
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IO.println "foo";
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pure ()
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