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