64 lines
1.5 KiB
Haskell
64 lines
1.5 KiB
Haskell
{-# LANGUAGE MultiWayIf #-}
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import Data.List.Split (splitOn)
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import System.Directory (setCurrentDirectory)
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import System.Exit (exitSuccess)
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import System.IO
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import System.Process (callCommand)
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prompt :: IO ()
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prompt = do
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input <- moshReadLine promptStringOne
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moshExecute input
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prompt
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moshReadLine :: String -> IO String
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moshReadLine ps1 = do
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putStr ps1
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hFlush stdout
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getLine
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moshExecute :: String -> IO ()
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moshExecute input = do
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if
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| command == "exit" -> exitSuccess
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| command == "help" -> moshHelp
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| command == "cd" -> changeDirectory path
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| otherwise -> callCommand input
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where
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command = head (splitOn " " input)
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path = last (splitOn " " input)
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changeDirectory :: FilePath -> IO ()
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changeDirectory path = do
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setCurrentDirectory path
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moshHelp :: IO ()
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moshHelp = do
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putStrLn "---------------------"
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putStrLn "MoSH -- Monadic Shell"
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putStrLn "Author: sajenim"
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putStrLn "---------------------"
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putStrLn "Type program names and arguments, and hit enter."
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putStrLn ""
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putStrLn "The following are built in:"
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putStr (unlines (prepend " " builtinCommands))
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putStrLn ""
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putStrLn "Use the man command for information on other programs"
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builtinCommands :: [String]
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builtinCommands = [ "cd"
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, "help"
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, "exit"
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]
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promptStringOne :: String
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promptStringOne = "> "
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prepend :: String -> [String] -> [String]
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prepend s = map (s ++)
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main :: IO ()
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main = do
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prompt
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