Hi,
is there a version of getChar that doesn't buffer keyboard input until enter
is pressed?
specialReadln :: IO String
specialReadln = do c ← getChar
if c == '#'
then do return []
else do cs ← specialReadln
Cetin Sert wrote:
is there a version of getChar that doesn't buffer keyboard input until
enter is pressed?
Look into hSetBuffering (module System.IO or IO). As a quick start:
hSetBuffering stdin NoBuffering
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Hello
Using system or any variant of it from System.Process
seems broken in multithreaded environments. This
example will fail with and without -threaded.
When run the program will print hello: start and
then freeze. After pressing enter (the first getChar)
System.Cmd.system will complete, but
Here is a version that works fine:
myRawSystem cmd args = do
(inP, outP, errP, pid) - runInteractiveProcess cmd args Nothing Nothing
hClose inP
os - pGetContents outP
es - pGetContents errP
ec - waitForProcess pid
case ec of
ExitSuccess - return ()
