mirror of
https://github.com/idris-lang/Idris2.git
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130 lines
3.3 KiB
Idris
130 lines
3.3 KiB
Idris
module System
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import public Data.So
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import Data.List
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import Data.Strings
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support : String -> String
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support fn = "C:" ++ fn ++ ", libidris2_support"
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libc : String -> String
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libc fn = "C:" ++ fn ++ ", libc 6"
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%foreign support "idris2_sleep"
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prim_sleep : Int -> PrimIO ()
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%foreign support "idris2_usleep"
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prim_usleep : Int -> PrimIO ()
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export
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sleep : Int -> IO ()
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sleep sec = primIO (prim_sleep sec)
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export
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usleep : (x : Int) -> So (x >= 0) => IO ()
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usleep sec = primIO (prim_usleep sec)
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-- This one is going to vary for different back ends. Probably needs a
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-- better convention. Will revisit...
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%foreign "scheme:blodwen-args"
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prim__getArgs : PrimIO (List String)
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export
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getArgs : IO (List String)
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getArgs = primIO prim__getArgs
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%foreign libc "getenv"
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prim_getEnv : String -> PrimIO (Ptr String)
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%foreign support "idris2_getEnvPair"
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prim_getEnvPair : Int -> PrimIO (Ptr String)
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%foreign support "idris2_setenv"
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prim_setEnv : String -> String -> Int -> PrimIO Int
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%foreign support "idris2_unsetenv"
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prim_unsetEnv : String -> PrimIO Int
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export
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getEnv : String -> IO (Maybe String)
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getEnv var
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= do env <- primIO $ prim_getEnv var
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if prim__nullPtr env /= 0
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then pure Nothing
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else pure (Just (prim__getString env))
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export
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getEnvironment : IO (List (String, String))
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getEnvironment = getAllPairs 0 []
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where
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splitEq : String -> (String, String)
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splitEq str
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= let (k, v) = break (== '=') str
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(_, v') = break (/= '=') v in
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(k, v')
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getAllPairs : Int -> List String -> IO (List (String, String))
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getAllPairs n acc = do
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envPair <- primIO $ prim_getEnvPair n
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if prim__nullPtr envPair /= 0
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then pure $ reverse $ map splitEq acc
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else getAllPairs (n + 1) (prim__getString envPair :: acc)
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export
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setEnv : String -> String -> Bool -> IO Bool
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setEnv var val overwrite
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= do ok <- primIO $ prim_setEnv var val (if overwrite then 1 else 0)
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if ok == 0
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then pure True
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else pure False
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export
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unsetEnv : String -> IO Bool
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unsetEnv var
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= do ok <- primIO $ prim_unsetEnv var
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if ok == 0
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then pure True
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else pure False
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%foreign libc "system"
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"scheme:blodwen-system"
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prim_system : String -> PrimIO Int
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export
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system : String -> IO Int
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system cmd = primIO (prim_system cmd)
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%foreign support "idris2_time"
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"scheme:blodwen-time"
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prim_time : PrimIO Int
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export
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time : IO Integer
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time = pure $ cast !(primIO prim_time)
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%foreign libc "exit"
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prim_exit : Int -> PrimIO ()
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||| Programs can either terminate successfully, or end in a caught
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||| failure.
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public export
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data ExitCode : Type where
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||| Terminate successfully.
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ExitSuccess : ExitCode
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||| Program terminated for some prescribed reason.
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||| @errNo A non-zero numerical value indicating failure.
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||| @prf Proof that the int value is non-zero.
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ExitFailure : (errNo : Int) -> (So (not $ errNo == 0)) => ExitCode
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export
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exitWith : ExitCode -> IO a
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exitWith ExitSuccess = believe_me $ primIO $ prim_exit 0
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exitWith (ExitFailure code) = believe_me $ primIO $ prim_exit code
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||| Exit the program indicating failure.
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export
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exitFailure : IO a
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exitFailure = exitWith (ExitFailure 1)
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||| Exit the program after a successful run.
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export
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exitSuccess : IO a
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exitSuccess = exitWith ExitSuccess
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