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131 lines
4.6 KiB
Haskell
131 lines
4.6 KiB
Haskell
{-|
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hledger's cmdargs modes parse command-line arguments to an
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intermediate format, RawOpts (an association list), rather than a
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fixed ADT like CliOpts. This allows the modes and flags to be reused
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more easily by hledger commands/scripts in this and other packages.
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-}
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module Hledger.Data.RawOptions (
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RawOpts,
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setopt,
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setboolopt,
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appendopts,
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inRawOpts,
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boolopt,
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choiceopt,
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collectopts,
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stringopt,
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maybestringopt,
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listofstringopt,
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intopt,
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posintopt,
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maybeintopt,
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maybeposintopt,
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maybecharopt,
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overRawOpts
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)
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where
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import Data.Maybe (fromMaybe, isJust, mapMaybe)
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import Data.Default (Default(..))
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import Safe (headMay, lastMay, readDef)
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import Hledger.Utils
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-- | The result of running cmdargs: an association list of option names to string values.
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newtype RawOpts = RawOpts { unRawOpts :: [(String,String)] }
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deriving (Show)
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instance Default RawOpts where def = RawOpts []
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overRawOpts f = RawOpts . f . unRawOpts
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setopt :: String -> String -> RawOpts -> RawOpts
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setopt name val = overRawOpts (++ [(name, val)])
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setboolopt :: String -> RawOpts -> RawOpts
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setboolopt name = overRawOpts (++ [(name,"")])
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appendopts :: [(String,String)] -> RawOpts -> RawOpts
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appendopts new = overRawOpts (++new)
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-- | Is the named option present ?
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inRawOpts :: String -> RawOpts -> Bool
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inRawOpts name = isJust . lookup name . unRawOpts
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boolopt :: String -> RawOpts -> Bool
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boolopt = inRawOpts
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-- | From a list of RawOpts, get the last one (ie the right-most on the command line)
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-- for which the given predicate returns a Just value.
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-- Useful for exclusive choice flags like --daily|--weekly|--quarterly...
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--
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-- >>> import Safe (readMay)
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-- >>> choiceopt Just (RawOpts [("a",""), ("b",""), ("c","")])
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-- Just "c"
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-- >>> choiceopt (const Nothing) (RawOpts [("a","")])
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-- Nothing
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-- >>> choiceopt readMay (RawOpts [("LT",""),("EQ",""),("Neither","")]) :: Maybe Ordering
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-- Just EQ
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choiceopt :: (String -> Maybe a) -- ^ "parser" that returns 'Just' value for valid choice
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-> RawOpts -- ^ actual options where to look for flag
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-> Maybe a -- ^ exclusive choice among those returned as 'Just' from "parser"
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choiceopt f = lastMay . collectopts (f . fst)
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-- | Collects processed and filtered list of options preserving their order
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--
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-- >>> collectopts (const Nothing) (RawOpts [("x","")])
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-- []
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-- >>> collectopts Just (RawOpts [("a",""),("b","")])
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-- [("a",""),("b","")]
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collectopts :: ((String, String) -> Maybe a) -> RawOpts -> [a]
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collectopts f = mapMaybe f . unRawOpts
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maybestringopt :: String -> RawOpts -> Maybe String
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maybestringopt name = lookup name . reverse . unRawOpts
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stringopt :: String -> RawOpts -> String
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stringopt name = fromMaybe "" . maybestringopt name
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maybecharopt :: String -> RawOpts -> Maybe Char
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maybecharopt name (RawOpts rawopts) = lookup name rawopts >>= headMay
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listofstringopt :: String -> RawOpts -> [String]
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listofstringopt name (RawOpts rawopts) = [v | (k,v) <- rawopts, k==name]
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-- | Reads the named option's Int argument, if it is present.
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-- An argument that is too small or too large will raise an error.
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maybeintopt :: String -> RawOpts -> Maybe Int
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maybeintopt = maybeclippedintopt minBound maxBound
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-- | Reads the named option's natural-number argument, if it is present.
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-- An argument that is negative or too large will raise an error.
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maybeposintopt :: String -> RawOpts -> Maybe Int
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maybeposintopt = maybeclippedintopt 0 maxBound
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-- | Reads the named option's Int argument. If not present it will
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-- return 0. An argument that is too small or too large will raise an error.
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intopt :: String -> RawOpts -> Int
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intopt name = fromMaybe 0 . maybeintopt name
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-- | Reads the named option's natural-number argument. If not present it will
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-- return 0. An argument that is negative or too large will raise an error.
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posintopt :: String -> RawOpts -> Int
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posintopt name = fromMaybe 0 . maybeposintopt name
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-- | Reads the named option's Int argument, if it is present. An argument
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-- that does not fit within the given bounds will raise an error.
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maybeclippedintopt :: Int -> Int -> String -> RawOpts -> Maybe Int
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maybeclippedintopt minVal maxVal name =
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fmap (intOrError . readOrError) . maybestringopt name
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where
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readOrError s = readDef (usageError $ "could not parse " ++ name ++ " number: " ++ s) s
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intOrError n | n >= toInteger minVal && n <= toInteger maxVal = fromInteger n
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| otherwise = usageError $ "argument to " ++ name
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++ " must lie in the range "
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++ show minVal ++ " to " ++ show maxVal
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++ ", but is " ++ show n
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