|
definition:
|
getFileInPath :: String -> IO (Maybe String)
getFileInPath file = dirsInPath >>= checkPath
where
checkPath [] = return Nothing
checkPath (dir:dirs) = do
let dirfile = dir </> file
direx <- doesFileExist dirfile
if direx then getAbsolutePath dirfile >>= return . Just
else checkPath dirs
|
|
demand:
|
no demanded arguments
|
|
deterministic:
|
deterministic operation
|
|
documentation:
|
--- Checks whether a file exists in one of the directories
--- of the environment variable `PATH` and returns its absolute path,
--- otherwise returns `Nothing`.
|
|
failfree:
|
<FAILING>
|
|
indeterministic:
|
referentially transparent operation
|
|
infix:
|
no fixity defined
|
|
iotype:
|
{(_) |-> _}
|
|
name:
|
getFileInPath
|
|
precedence:
|
no precedence defined
|
|
result-values:
|
_
|
|
signature:
|
String -> Prelude.IO (Prelude.Maybe String)
|
|
solution-complete:
|
operation might suspend on free variables
|
|
terminating:
|
possibly non-terminating
|
|
totally-defined:
|
possibly non-reducible on same data term
|