module CmdLineParser (
processArgs, OptKind(..),
- CmdLineP(..), getCmdLineState, putCmdLineState
+ CmdLineP(..), getCmdLineState, putCmdLineState,
+ Flag(..), Deprecated(..),
) where
#include "HsVersions.h"
import Util
import Panic
+data Flag m = Flag
+ {
+ flagName :: String, -- flag, without the leading -
+ flagOptKind :: (OptKind m), -- what to do if we see it
+ flagDeprecated :: Deprecated -- is the flag deprecated?
+ }
+
+data Deprecated = Supported | Deprecated String
+
data OptKind m -- Suppose the flag is -f
= NoArg (m ()) -- -f all by itself
| HasArg (String -> m ()) -- -farg or -f arg
| AnySuffixPred (String -> Bool) (String -> m ())
processArgs :: Monad m
- => [(String, OptKind m)] -- cmdline parser spec
+ => [Flag m] -- cmdline parser spec
-> [String] -- args
-> m (
[String], -- spare args
- [String] -- errors
+ [String], -- errors
+ [String] -- warnings
)
-processArgs spec args = process spec args [] []
+processArgs spec args = process spec args [] [] []
where
- process _spec [] spare errs =
- return (reverse spare, reverse errs)
+ process _spec [] spare errs warns =
+ return (reverse spare, reverse errs, reverse warns)
- process spec (dash_arg@('-':arg):args) spare errs =
+ process spec (dash_arg@('-' : arg) : args) spare errs warns =
case findArg spec arg of
- Just (rest,action) ->
- case processOneArg action rest arg args of
- Left err -> process spec args spare (err:errs)
- Right (action,rest) -> action >> process spec rest spare errs
- Nothing -> process spec args (dash_arg:spare) errs
+ Just (rest, action, deprecated) ->
+ let warns' = case deprecated of
+ Deprecated warning ->
+ ("Warning: " ++ dash_arg ++ " is deprecated: " ++ warning) : warns
+ Supported -> warns
+ in case processOneArg action rest arg args of
+ Left err -> process spec args spare (err:errs) warns'
+ Right (action,rest) -> do action
+ process spec rest spare errs warns'
+ Nothing -> process spec args (dash_arg : spare) errs warns
- process spec (arg:args) spare errs =
- process spec args (arg:spare) errs
+ process spec (arg : args) spare errs warns =
+ process spec args (arg : spare) errs warns
processOneArg :: OptKind m -> String -> String -> [String]
AnySuffixPred _ f -> Right (f dash_arg, args)
-findArg :: [(String,OptKind a)] -> String -> Maybe (String,OptKind a)
+findArg :: [Flag m] -> String -> Maybe (String, OptKind m, Deprecated)
findArg spec arg
- = case [ (removeSpaces rest, k)
- | (pat,k) <- spec,
- Just rest <- [maybePrefixMatch pat arg],
- arg_ok k rest arg ]
+ = case [ (removeSpaces rest, optKind, flagDeprecated flag)
+ | flag <- spec,
+ let optKind = flagOptKind flag,
+ Just rest <- [maybePrefixMatch (flagName flag) arg],
+ arg_ok optKind rest arg ]
of
[] -> Nothing
(one:_) -> Just one