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more command-specific options

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Made --from and --to command-specific options.

Added generic storage for values of command-specific options,
which allows removing some of the special case fields in AnnexState.

(Also added generic storage for command-specific flags, although there are
not yet any.)

Note that this storage uses a Map, so repeatedly looking up the same value
is slightly more expensive than looking up an AnnexState field. But, the
value can be looked up once in the seek stage, transformed as necessary,
and passed in a closure to the start stage, and this avoids that overhead.

Still, I'm hesitant to use this for things like force or fast flags.
It's probably best to reserve it for flags that are only used by a few
commands, or options like --from and --to that it's important only be
allowed to be used with commands that implement them, to avoid user
confusion.
This commit is contained in:
Joey Hess 2012-01-06 03:06:25 -04:00
parent 2051d80462
commit 0a36f92a31
13 changed files with 107 additions and 75 deletions
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12
Command/Copy.hs
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@ -12,15 +12,15 @@ import Command
import qualified Command.Move
def :: [Command]
def = [dontCheck toOpt $ dontCheck fromOpt $
command "copy" paramPaths seek
def = [withOptions Command.Move.options $ command "copy" paramPaths seek
"copy content of files to/from another repository"]
seek :: [CommandSeek]
seek = [withNumCopies $ \n -> whenAnnexed $ start n]
seek = [withField "to" id $ \to -> withField "from" id $ \from ->
withNumCopies $ \n -> whenAnnexed $ start to from n]
-- A copy is just a move that does not delete the source file.
-- However, --auto mode avoids unnecessary copies.
start :: Maybe Int -> FilePath -> (Key, Backend) -> CommandStart
start numcopies file (key, backend) = autoCopies key (<) numcopies $
Command.Move.start False file (key, backend)
start :: Maybe String -> Maybe String -> Maybe Int -> FilePath -> (Key, Backend) -> CommandStart
start to from numcopies file (key, backend) = autoCopies key (<) numcopies $
Command.Move.start to from False file (key, backend)