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|
{-# LANGUAGE ImpredicativeTypes #-}
{-# LANGUAGE QuantifiedConstraints #-}
module Process
( sh,
sh_,
ProcessType,
Quotable (..),
proc,
)
where
import Control.Exception (Exception, throwIO)
import Data.ByteString.Lazy (ByteString)
import Data.List (intercalate)
import Data.String (fromString)
import Data.Text (Text, unpack)
import System.Exit (ExitCode (ExitSuccess))
import System.Process.Typed (ProcessConfig, readProcess, readProcessStderr)
data ProcessException = ProcessException String ExitCode ByteString
deriving (Show)
instance Exception ProcessException
sh :: ProcessConfig stdin stdoutIgnored stderr -> IO ByteString
sh processConfig = do
(exitCode, out, err) <- readProcess processConfig
if exitCode == ExitSuccess
then pure out
else throwIO $ ProcessException (show processConfig) exitCode err
sh_ :: ProcessConfig stdin stdoutIgnored stderr -> IO ()
sh_ processConfig = do
(exitCode, err) <- readProcessStderr processConfig
if exitCode == ExitSuccess
then pure ()
else throwIO $ ProcessException (show processConfig) exitCode err
class Quotable a where
quote :: a -> String
instance {-# OVERLAPPING #-} Quotable String where
quote s = "'" ++ escape s ++ "'"
where
escape [] = []
escape ('\'' : cs) = '\'' : '\\' : '\'' : '\'' : escape cs
escape (c : cs) = c : escape cs
instance Quotable Text where
quote = quote . unpack
instance {-# OVERLAPPABLE #-} Quotable a => Quotable [a] where
quote = intercalate " " . map quote
class ProcessType r where
spr :: String -> [String] -> r
instance (Quotable a, ProcessType r) => ProcessType (a -> r) where
spr fmt as = \a -> spr fmt (quote a : as)
instance (() ~ stdin, () ~ stdoutIgnored, () ~ stderr) => ProcessType (ProcessConfig stdin stdoutIgnored stderr) where
spr fmt args = fromString (interp (reverse args) fmt)
interp :: [String] -> String -> String
interp (_ : _) "" = error "sh: extra arguments"
interp [] "" = ""
interp as ('%' : '%' : cs) = '%' : interp as cs
interp [] ('%' : _) = error "sh: insufficient arguments"
interp (a : as) ('%' : cs) = a ++ interp as cs
interp as (c : cs) = c : interp as cs
proc :: ProcessType r => String -> r
proc fmt = spr fmt []
|
