-//gopt{|Maybe|} (Positionals [ReqArg f d]) = Positionals
-// [OptArg (\ms _ ->case ms of
-// Nothing = Ok Nothing
-// // Is this necessary
-// Just s = case f s undef of
-// Ok a = Ok (Just a)
-// Error e = Error e
-// ) d]
-//gopt{|PAIR|} fx fg = case (fx, fg) of
-// (Options as, Options bs) = Options $
-// [Option s r (topair (\(PAIR l r)->l) (\(PAIR _ r) l->PAIR l r) f) d\\(Option s r f d)<-as]
-// ++ [Option s r (topair (\(PAIR l r)->r) (\(PAIR l _) r->PAIR l r) f) d\\(Option s r f d)<-bs]
-//topair fr to (NoArg fa) = NoArg \a->case fa (fr a) of
-// Ok na = Ok (to a na)
-// Error e = Error e
-//topair fr to (ReqArg fa d) = ReqArg (\s a->case fa s (fr a) of
-// Ok na = Ok (to a na)
-// Error e = Error e) d
-//topair fr to (OptArg fa d) = OptArg (\s a->case fa s (fr a) of
-// Ok na = Ok (to a na)
-// Error e = Error e) d
-//
-parseOpts :: (Opt a) [String] a -> MaybeError [String] a
-parseOpts (Positionals [p:ps]) [] a = Error [toString (length [p:ps]) +++ " positional arguments required"]
-parseOpts (Positionals [p:ps]) [arg:args] a = p arg a >>= parseOpts (Positionals ps) args
-//parseOpts (Options opts) args i
-// # (transformers, positionals, errors) = getOpt Permute [helpopt:opts] args
-// | not (errors =: []) = Error [usageInfo "" [helpopt:opts]:errors]
-// = case folder transformers i of
-// Error e = Error [usageInfo "" [helpopt:opts]:e]
-// Ok a = Ok a
-parseOpts _ _ i = Ok i
-//
-//helpopt = Option [] ["help"] (NoArg \a->Error []) ""
-//
-//folder [] i = Ok i
-//folder [tr:trs] i = tr i >>= folder trs
-//
+
+ ptoarg [p] [] i = Error ["Not enough arguments for " +++ gfd_name]
+ ptoarg [(_, p):ps] [a:as] i = p a i >>= ptoarg ps as
+ ptoarg [] as i = Ok (i, as)
+gopt{|PAIR|} l r = case (l, r) of
+ (Positionals pl, Positionals pr)
+ = Positionals
+ $ map (appSnd $ combine PFst appPFst) pl
+ ++ map (appSnd $ combine PSnd appPSnd) pr
+ (Flags fl, Flags fr)
+ = Flags
+ $ map (appSnd $ combine` PFst appPFst) fl
+ ++ map (appSnd $ combine` PSnd appPSnd) fr
+ (x, y) = abort $ "gopt{|PAIR|}: " +++ consPrint x +++ " " +++ consPrint y
+where
+ appPFst f (PAIR x y) = PAIR (f x) y
+ appPSnd f (PAIR x y) = PAIR x (f y)
+ PFst (PAIR x y) = x
+ PSnd (PAIR x y) = y
+gopt{|UNIT|} = Positionals []
+gopt{|CONS of {gcd_name}|} c = bifmap (\(CONS a)->a) CONS $ SubParsers [(gcd_name, c)]
+gopt{|EITHER|} l r = case (l, r) of
+ (SubParsers sl, SubParsers sr)
+ = SubParsers
+ $ map (appSnd $ bifmap (\(LEFT a)->a) LEFT) sl
+ ++ map (appSnd $ bifmap (\(RIGHT a)->a) RIGHT) sr
+gopt{|(,)|} l r = case (l, r) of
+ (Positionals pl, Positionals pr)
+ = Positionals
+ $ map (appSnd $ combine fst appFst) pl
+ ++ map (appSnd $ combine snd appSnd) pr
+gopt{|(,,)|} f s t = case (f, s, t) of
+ (Positionals pf, Positionals ps, Positionals pt)
+ = Positionals
+ $ map (appSnd $ combine fst3 appFst3) pf
+ ++ map (appSnd $ combine snd3 appSnd3) ps
+ ++ map (appSnd $ combine thd3 appThd3) pt
+
+consPrint (Positionals x) = "Positionals"
+consPrint (BinaryFlag x _) = "BinaryFlag"
+consPrint (Flags x) = "Flags"
+consPrint (SubParsers x) = "SubParsers"
+
+parseOpts :: [String] a -> MaybeError [String] (a, [String]) | gopt{|*|} a
+parseOpts args a = pOpts gopt{|*|} args a
+
+pOpts :: (Opt a) [String] a -> MaybeError [String] (a, [String])
+pOpts (Positionals [p:ps]) [] a = Error [toString (length [p:ps]) +++ " positional arguments required"]
+pOpts (Positionals [p:ps]) [arg:args] a = (snd p) arg a >>= pOpts (Positionals ps) args
+pOpts (SubParsers ps) [arg:args] a = case find (\(l,p)->l==arg) ps of
+ Nothing = Error ["Unrecognized subcommand"]
+ Just (l, p) = pOpts p args a
+pOpts (SubParsers ps) [] a = Error ["One of these subcommands required: " +++ join ", " (map fst ps)]
+pOpts (Flags fs) [arg:args] a
+ | not (startsWith "--" arg) = Ok (a, [arg:args])
+ = case find (\(l,p)->"--" +++ l == arg) fs of
+ Nothing = Error ["Unrecognized option: " +++ arg]
+ Just (l, p) = p args a >>= \(a, args)->pOpts (Flags fs) args a
+pOpts (BinaryFlag yes no) args a
+ = pOpts (Positionals [("BOOL", \s v->
+ if (s == "True")
+ (Ok (yes v))
+ (if (s == "False")
+ (Ok (no v))
+ (Error ["Not True or False"])
+ )
+ )]) args a
+pOpts t args a = Ok (a, args)
+
+pHelp :: (Opt a) -> [String]
+pHelp (Positionals []) = []
+pHelp (Positionals [(i, _):ps]) = [i, " ":pHelp $ Positionals ps]
+pHelp (SubParsers ps) =
+ flatten
+ [[n, " ":pHelp opt] ++ ["\n"]
+ \\(n, opt)<-ps
+ ]
+pHelp (Flags fs) =
+ ["Flags\n"
+ :
+ flatten
+ [["--",f, "\n"]
+ \\(f, p)<-fs
+ ]
+ ]
+