69 lines
1.8 KiB
Haskell
69 lines
1.8 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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inRawOpts,
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boolopt,
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stringopt,
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maybestringopt,
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listofstringopt,
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intopt,
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maybeintopt,
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optserror
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)
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where
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import Data.Maybe
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import Safe
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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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type RawOpts = [(String,String)]
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setopt :: String -> String -> RawOpts -> RawOpts
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setopt name val = (++ [(name, quoteIfNeeded val)])
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setboolopt :: String -> RawOpts -> RawOpts
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setboolopt name = (++ [(name,"")])
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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
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boolopt :: String -> RawOpts -> Bool
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boolopt = inRawOpts
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maybestringopt :: String -> RawOpts -> Maybe String
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maybestringopt name = maybe Nothing (Just . stripquotes) . lookup name . reverse
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stringopt :: String -> RawOpts -> String
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stringopt name = fromMaybe "" . maybestringopt name
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listofstringopt :: String -> RawOpts -> [String]
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listofstringopt name rawopts = [v | (k,v) <- rawopts, k==name]
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maybeintopt :: String -> RawOpts -> Maybe Int
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maybeintopt name rawopts =
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let ms = maybestringopt name rawopts in
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case ms of Nothing -> Nothing
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Just s -> Just $ readDef (optserror $ "could not parse "++name++" number: "++s) s
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intopt :: String -> RawOpts -> Int
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intopt name = fromMaybe 0 . maybeintopt name
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-- | Raise an error, showing the specified message plus a hint about --help.
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optserror :: String -> a
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optserror = error' . (++ " (run with --help for usage)")
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