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{- git-annex command data types
-
- Copyright 2010-2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Types.Command where
import Types
{- A command runs in these stages.
-
- a. The check stage runs checks, that error out if
- anything prevents the command from running. -}
data CommandCheck = CommandCheck { idCheck :: Int, runCheck :: Annex () }
{- b. The seek stage takes the parameters passed to the command,
- looks through the repo to find the ones that are relevant
- to that command (ie, new files to add), and generates
- a list of start stage actions. -}
type CommandSeek = [String] -> Annex [CommandStart]
{- c. The start stage is run before anything is printed about the
- command, is passed some input, and can early abort it
- if the input does not make sense. It should run quickly and
- should not modify Annex state. -}
type CommandStart = Annex (Maybe CommandPerform)
{- d. The perform stage is run after a message is printed about the command
- being run, and it should be where the bulk of the work happens. -}
type CommandPerform = Annex (Maybe CommandCleanup)
{- e. The cleanup stage is run only if the perform stage succeeds, and it
- returns the overall success/fail of the command. -}
type CommandCleanup = Annex Bool
{- A command is defined by specifying these things. -}
data Command = Command {
cmdcheck :: [CommandCheck],
cmdname :: String,
cmdparams :: String,
cmdseek :: [CommandSeek],
cmddesc :: String
}
{- CommandCheck functions can be compared using their unique id. -}
instance Eq CommandCheck where
a == b = idCheck a == idCheck b
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