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import Math
import System.Environment
import Data.List
import Text.Printf
errorMessage :: String -> String
errorMessage "" = "nd v1\nUsage: nd [-help, -int, -prime, -factor, -hcf]\n"
errorMessage reason = "nd v1\nFAILURE: "
++ reason
++ "\nUsage: nd [-int, -prime, -factor, -hcf]\n"
flagHandlerF :: [String] -> Int -> String -> ([String] -> String) -> String
flagHandlerF args (-1) error fmessage =
if (length args) == 0
then error
else
(fmessage args)
flagHandlerF args nargs error fmessage =
if (length args) /= nargs
then error
else
(fmessage args)
flagHandler :: String -> [String] -> String
flagHandler "-prime" args =
flagHandlerF args (-1)
(errorMessage "-prime requires at least one integer argument")
(\args ->
foldl (++) "" [show y ++ ": isPrime=" ++ (show $ isPrime y)
++ "\n" | x <- args, let y = (read x) :: Int])
flagHandler "-factor" args =
flagHandlerF args (-1)
(errorMessage "-factor requires at least one integer argument")
(\args ->
foldl (++) "" [show y ++ ": factors=" ++ show (factors $ y)
| x <- args, let y = (read x) :: Int])
flagHandler "-int" args =
flagHandlerF args (-1)
(errorMessage "-int requires at least one integer argument")
(\args ->
foldl (++) "" [show y ++ ": (isPrime=" ++ (show $ isPrime y)
++ ", factors=" ++ (show $ factors y)
++ ")\n" | x <- args, let y = (read x) :: Int])
flagHandler "-hcf" args =
flagHandlerF args (2)
(errorMessage "-hcf requires two integer arguments")
(\args ->
let n = (read $ head args) :: Int
m = (read $ head $ tail args) :: Int
hcf = head $ reverse $ intersect (factors n) (factors m) in
"hcf(" ++ show n ++ ", " ++ show m ++ "): hcf=" ++ show hcf)
flagHandler _ _ =
errorMessage "Flag not recognised"
main = do
args <- getArgs
putStr $
case args of
[] -> errorMessage ""
(x: xs) -> if x == "-help" then errorMessage "" else flagHandler x xs
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