- A Haskell port of GNU's getopt library
-
- Sven Panne <Sven.Panne@informatik.uni-muenchen.de> Oct. 1996; last change: Jul. 1998
-
- Two rather obscure features are missing: The Bash 2.0 non-option hack (if you don't
- already know it, you probably don't want to hear about it...) and the recognition of
- long options with a single dash (e.g. '-help' is recognised as '--help', as long as
- there is no short option 'h').
-
- Other differences between GNU's getopt and this implementation:
- * To enforce a coherent description of options and arguments, there are explanation
- fields in the option/argument descriptor.
- * Error messages are now more informative, but no longer POSIX compliant... :-(
-
- And a final Haskell advertisement: The GNU C implementation uses well over 1100 lines,
- we need only 199 here, including a 46 line example! :-)
+A Haskell port of GNU's getopt library
+
+Sven Panne <Sven.Panne@informatik.uni-muenchen.de> Oct. 1996 (small
+changes Dec. 1997)
+
+Two rather obscure features are missing: The Bash 2.0 non-option hack
+(if you don't already know it, you probably don't want to hear about
+it...) and the recognition of long options with a single dash
+(e.g. '-help' is recognised as '--help', as long as there is no short
+option 'h').
+
+Other differences between GNU's getopt and this implementation: * To
+enforce a coherent description of options and arguments, there are
+explanation fields in the option/argument descriptor. * Error
+messages are now more informative, but no longer POSIX
+compliant... :-( And a final Haskell advertisement: The GNU C
+implementation uses well over 1100 lines, we need only 195 here,
+including a 46 line example! :-)
\begin{code}
-module GetOpt (
- ArgOrder(..), OptDescr(..), ArgDescr(..), usageInfo, getOpt
- ) where
+module GetOpt (ArgOrder(..), OptDescr(..), ArgDescr(..), usageInfo, getOpt) where
import List(isPrefixOf)
fmtOpt (Option sos los ad descr) = (sepBy ", " (map (fmtShort ad) sos),
sepBy ", " (map (fmtLong ad) los),
descr)
- where sepBy _ [] = ""
- sepBy _ [x] = x
+ where sepBy sep [] = ""
+ sepBy sep [x] = x
sepBy sep (x:xs) = x ++ sep ++ sepBy sep xs
fmtShort :: ArgDescr a -> Char -> String
-> [OptDescr a] -- option descriptors
-> [String] -- the commandline arguments
-> ([a],[String],[String]) -- (options,non-options,error messages)
-getOpt _ _ [] = ([],[],[])
-getOpt ordering optDescr args = procNextOpt opt ordering
+getOpt _ _ [] = ([],[],[])
+getOpt ordering optDescr (arg:args) = procNextOpt opt ordering
where procNextOpt (Opt o) _ = (o:os,xs,es)
procNextOpt (NonOpt x) RequireOrder = ([],x:rest,[])
procNextOpt (NonOpt x) Permute = (os,x:xs,es)
procNextOpt EndOfOpts (ReturnInOrder f) = (map f rest,[],[])
procNextOpt (OptErr e) _ = (os,xs,e:es)
- (opt,rest) = getNext args optDescr
+ (opt,rest) = getNext arg args optDescr
(os,xs,es) = getOpt ordering optDescr rest
-- take a look at the next cmd line arg and decide what to do with it
-getNext :: [String] -> [OptDescr a] -> (OptKind a,[String])
-getNext (('-':'-':[]):rest) _ = (EndOfOpts,rest)
-getNext (('-':'-':xs):rest) optDescr = longOpt xs rest optDescr
-getNext (('-':x:xs) :rest) optDescr = shortOpt x xs rest optDescr
-getNext (a :rest) _ = (NonOpt a,rest)
-getNext [] _ = error "getNext: impossible"
+getNext :: String -> [String] -> [OptDescr a] -> (OptKind a,[String])
+getNext ('-':'-':[]) rest _ = (EndOfOpts,rest)
+getNext ('-':'-':xs) rest optDescr = longOpt xs rest optDescr
+getNext ('-': x :xs) rest optDescr = shortOpt x xs rest optDescr
+getNext a rest _ = (NonOpt a,rest)
-- handle long option
longOpt :: String -> [String] -> [OptDescr a] -> (OptKind a,[String])
ads = [ ad | Option _ _ ad _ <- options ]
optStr = ("--"++opt)
- long (_:_:_) _ rest1 = (errAmbig options optStr,rest1)
- long [NoArg a ] [] rest1 = (Opt a,rest1)
- long [NoArg _ ] ('=':_) rest1 = (errNoArg optStr,rest1)
- long [ReqArg _ d] [] [] = (errReq d optStr,[])
- long [ReqArg f _] [] (r:rest1) = (Opt (f r),rest1)
- long [ReqArg f _] ('=':ys) rest1 = (Opt (f ys),rest1)
- long [OptArg f _] [] rest1 = (Opt (f Nothing),rest1)
- long [OptArg f _] ('=':ys) rest1 = (Opt (f (Just ys)),rest1)
- long [_] (_ :_) _ = error "long: impossible"
- long [] _ rest1 = (errUnrec optStr,rest1)
+ long (_:_:_) _ rest = (errAmbig options optStr,rest)
+ long [NoArg a ] [] rest = (Opt a,rest)
+ long [NoArg a ] ('=':xs) rest = (errNoArg optStr,rest)
+ long [ReqArg f d] [] [] = (errReq d optStr,[])
+ long [ReqArg f _] [] (r:rest) = (Opt (f r),rest)
+ long [ReqArg f _] ('=':xs) rest = (Opt (f xs),rest)
+ long [OptArg f _] [] rest = (Opt (f Nothing),rest)
+ long [OptArg f _] ('=':xs) rest = (Opt (f (Just xs)),rest)
+ long _ _ rest = (errUnrec optStr,rest)
-- handle short option
shortOpt :: Char -> String -> [String] -> [OptDescr a] -> (OptKind a,[String])
ads = [ ad | Option _ _ ad _ <- options ]
optStr = '-':[x]
- short (_:_:_) _ rest1 = (errAmbig options optStr,rest1)
- short (NoArg a :_) [] rest1 = (Opt a,rest1)
- short (NoArg a :_) ys rest1 = (Opt a,('-':ys):rest1)
- short (ReqArg _ d:_) [] [] = (errReq d optStr,[])
- short (ReqArg f _:_) [] (r:rest1) = (Opt (f r),rest1)
- short (ReqArg f _:_) ys rest1 = (Opt (f ys),rest1)
- short (OptArg f _:_) [] rest1 = (Opt (f Nothing),rest1)
- short (OptArg f _:_) ys rest1 = (Opt (f (Just ys)),rest1)
- short [] [] rest1 = (errUnrec optStr,rest1)
- short [] ys rest1 = (errUnrec optStr,('-':ys):rest1)
+ short (_:_:_) _ rest = (errAmbig options optStr,rest)
+ short (NoArg a :_) [] rest = (Opt a,rest)
+ short (NoArg a :_) xs rest = (Opt a,('-':xs):rest)
+ short (ReqArg f d:_) [] [] = (errReq d optStr,[])
+ short (ReqArg f _:_) [] (r:rest) = (Opt (f r),rest)
+ short (ReqArg f _:_) xs rest = (Opt (f xs),rest)
+ short (OptArg f _:_) [] rest = (Opt (f Nothing),rest)
+ short (OptArg f _:_) xs rest = (Opt (f (Just xs)),rest)
+ short [] [] rest = (errUnrec optStr,rest)
+ short [] xs rest = (errUnrec optStr,('-':xs):rest)
-- miscellaneous error formatting
errNoArg :: String -> OptKind a
errNoArg optStr = OptErr ("option `" ++ optStr ++ "' doesn't allow an argument\n")
-\end{code}
{-
-----------------------------------------------------------------------------------------
-- -n USER --name=USER only dump USER's files
-----------------------------------------------------------------------------------------
-}
+\end{code}
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