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Guard hGetCursorPosition by hIsTerminalDevice stdin #180

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Guard hGetCursorPosition by hIsTerminalDevice stdin #180

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8 changes: 6 additions & 2 deletions ansi-terminal/src/System/Console/ANSI.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -391,7 +391,7 @@ import Data.Colour.SRGB ( RGB (..) )
import Data.Word ( Word16 )
import System.IO
( BufferMode (..), Handle, hFlush, hGetBuffering, hGetEcho, hPutStr
, hReady, hSetBuffering, hSetEcho, stdin, stdout
, hReady, hSetBuffering, hSetEcho, stdin, stdout, hIsTerminalDevice
)
import Text.ParserCombinators.ReadP
( ReadP, (<++), char, many1, readP_to_S, satisfy, string )
Expand Down Expand Up @@ -761,7 +761,11 @@ getCursorPosition = hGetCursorPosition stdout
--
-- @since 0.10.1
hGetCursorPosition :: Handle -> IO (Maybe (Int, Int))
hGetCursorPosition h = fmap to0base <$> getCursorPosition'
hGetCursorPosition h = do
isTerminalStdin <- hIsTerminalDevice stdin
if isTerminalStdin
then fmap to0base <$> getCursorPosition'
else pure Nothing
where
to0base (row, col) = (row - 1, col - 1)
getCursorPosition' = do
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