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cli: make argument-less --debug more robust

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Simon Michael 2016-02-19 22:53:25 -08:00
parent baeca07440
commit 7aab544cf6
2 changed files with 30 additions and 18 deletions
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2
hledger/Hledger/Cli/CliOptions.hs
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@ -95,7 +95,7 @@ helpflags :: [Flag RawOpts]
helpflags = [
flagNone ["help","h"] (setboolopt "help") "show general help or (after command) command help"
-- ,flagNone ["browse-args"] (setboolopt "browse-args") "use a web UI to select options and build up a command line"
,flagReq ["debug"] (\s opts -> Right $ setopt "debug" s opts) "N" "show debug output if N is 1-9 (default: 0)"
,flagReq ["debug"] (\s opts -> Right $ setopt "debug" s opts) "N" "show increasing amounts of debug output if N is 1-9. With no argument, show level 1"
,flagNone ["version"] (setboolopt "version") "show version information"
]

46
hledger/Hledger/Cli/Main.hs
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@ -157,26 +157,38 @@ argsToCliOpts args addons = do
-- - move all required-argument help and input flags along with their values, space-separated or not
-- - not confuse things further or cause misleading errors.
moveFlagsAfterCommand :: [String] -> [String]
moveFlagsAfterCommand args = move args
moveFlagsAfterCommand args = moveArgs $ ensureDebugHasArg args
where
move (f:a:as) | isMovableNoArgFlag f = (move $ a:as) ++ [f]
move (f:v:a:as) | isMovableReqArgFlag f = (move $ a:as) ++ [f,v]
move (fv:a:as) | isMovableReqArgFlagAndValue fv = (move $ a:as) ++ [fv]
move ("--debug":v:a:as) | not (null v) && all isDigit v = (move $ a:as) ++ ["--debug",v]
move ("--debug":a:as) = (move $ a:as) ++ ["--debug"]
move (fv@('-':'-':'d':'e':'b':'u':'g':'=':_):a:as) = (move $ a:as) ++ [fv]
move as = as
-- quickly! make sure --debug has a numeric argument, or this all goes to hell
ensureDebugHasArg as =
case break (=="--debug") as of
(bs,"--debug":c:cs) | null c || not (all isDigit c) -> bs++"--debug=1":c:cs
(bs,"--debug":[]) -> bs++"--debug=1":[]
_ -> as
isMovableNoArgFlag a = "-" `isPrefixOf` a && dropWhile (=='-') a `elem` noargflagstomove
isMovableReqArgFlag a = "-" `isPrefixOf` a && dropWhile (=='-') a `elem` reqargflagstomove
isMovableReqArgFlagAndValue ('-':'-':a:as) = case break (== '=') (a:as) of (f:fs,_) -> (f:fs) `elem` reqargflagstomove
_ -> False
isMovableReqArgFlagAndValue ('-':f:_:_) = [f] `elem` reqargflagstomove
isMovableReqArgFlagAndValue _ = False
-- -h ..., --version ...
moveArgs (f:a:as) | isMovableNoArgFlag f = (moveArgs $ a:as) ++ [f]
-- -f FILE ..., --alias ALIAS ...
moveArgs (f:v:a:as) | isMovableReqArgFlag f
, not (take 1 v == "-") = (moveArgs $ a:as) ++ [f,v]
-- -fFILE ..., --alias=ALIAS ...
moveArgs (fv:a:as) | isMovableReqArgFlagAndValue fv = (moveArgs $ a:as) ++ [fv]
-- anything else
moveArgs as = as
noargflagstomove = concatMap flagNames $ filter ((==FlagNone).flagInfo) flagstomove
reqargflagstomove = concatMap flagNames $ filter ((==FlagReq ).flagInfo) flagstomove
flagstomove = inputflags ++ helpflags
isMovableNoArgFlag a = "-" `isPrefixOf` a && dropWhile (=='-') a `elem` noargflagstomove
isMovableReqArgFlag a = "-" `isPrefixOf` a && dropWhile (=='-') a `elem` reqargflagstomove
isMovableReqArgFlagAndValue ('-':'-':a:as) = case break (== '=') (a:as) of (f:fs,_:_) -> (f:fs) `elem` reqargflagstomove
_ -> False
isMovableReqArgFlagAndValue ('-':shortflag:_:_) = [shortflag] `elem` reqargflagstomove
isMovableReqArgFlagAndValue _ = False
flagstomove = inputflags ++ helpflags
noargflagstomove = concatMap flagNames $ filter ((==FlagNone).flagInfo) flagstomove
reqargflagstomove = -- filter (/= "debug") $
concatMap flagNames $ filter ((==FlagReq ).flagInfo) flagstomove
-- | Let's go.
main :: IO ()