90 lines
2.2 KiB
Haskell
90 lines
2.2 KiB
Haskell
{- git-annex usage messages
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-
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- Copyright 2010-2011 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Usage where
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import Common.Annex
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import System.Console.GetOpt
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import Types.Command
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{- Usage message with lists of commands and options. -}
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usage :: String -> [Command] -> [Option] -> String
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usage header cmds commonoptions = unlines $
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[ header
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, ""
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, "Options:"
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] ++ optlines ++
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[ ""
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, "Commands:"
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, ""
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] ++ cmdlines
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where
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-- To get consistent indentation of options, generate the
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-- usage for all options at once. A command's options will
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-- be displayed after the command.
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alloptlines = filter (not . null) $
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lines $ usageInfo "" $
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concatMap cmdoptions cmds ++ commonoptions
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(cmdlines, optlines) = go (sort cmds) alloptlines []
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go [] os ls = (ls, os)
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go (c:cs) os ls = go cs os' (ls++(l:o))
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where
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(o, os') = splitAt (length $ cmdoptions c) os
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l = concat
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[ cmdname c
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, namepad (cmdname c)
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, cmdparamdesc c
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, descpad (cmdparamdesc c)
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, cmddesc c
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]
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pad n s = replicate (n - length s) ' '
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namepad = pad $ longest cmdname + 1
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descpad = pad $ longest cmdparamdesc + 2
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longest f = foldl max 0 $ map (length . f) cmds
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{- Descriptions of params used in usage messages. -}
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paramPaths :: String
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paramPaths = paramOptional $ paramRepeating paramPath -- most often used
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paramPath :: String
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paramPath = "PATH"
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paramKey :: String
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paramKey = "KEY"
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paramDesc :: String
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paramDesc = "DESC"
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paramUrl :: String
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paramUrl = "URL"
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paramNumber :: String
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paramNumber = "NUMBER"
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paramRemote :: String
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paramRemote = "REMOTE"
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paramGlob :: String
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paramGlob = "GLOB"
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paramName :: String
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paramName = "NAME"
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paramValue :: String
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paramValue = "VALUE"
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paramUUID :: String
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paramUUID = "UUID"
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paramType :: String
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paramType = "TYPE"
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paramDate :: String
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paramDate = "DATE"
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paramFormat :: String
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paramFormat = "FORMAT"
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paramFile :: String
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paramFile = "FILE"
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paramKeyValue :: String
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paramKeyValue = "K=V"
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paramNothing :: String
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paramNothing = ""
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paramRepeating :: String -> String
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paramRepeating s = s ++ " ..."
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paramOptional :: String -> String
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paramOptional s = "[" ++ s ++ "]"
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paramPair :: String -> String -> String
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paramPair a b = a ++ " " ++ b
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