blob: 7445615f65e61177fe1f6164e9a3311244e6174c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
{- git-annex deferred parse values
-
- Copyright 2015 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE FlexibleInstances #-}
module Types.DeferredParse where
import Annex
import Options.Applicative
-- Some values cannot be fully parsed without performing an action.
-- The action may be expensive, so it's best to call finishParse on such a
-- value before using getParsed repeatedly.
data DeferredParse a = DeferredParse (Annex a) | ReadyParse a
class DeferredParseClass a where
finishParse :: a -> Annex a
getParsed :: DeferredParse a -> Annex a
getParsed (DeferredParse a) = a
getParsed (ReadyParse a) = pure a
instance DeferredParseClass (DeferredParse a) where
finishParse (DeferredParse a) = ReadyParse <$> a
finishParse (ReadyParse a) = pure (ReadyParse a)
instance DeferredParseClass (Maybe (DeferredParse a)) where
finishParse Nothing = pure Nothing
finishParse (Just v) = Just <$> finishParse v
instance DeferredParseClass [DeferredParse a] where
finishParse v = mapM finishParse v
-- Use when the Annex action modifies Annex state.
type GlobalSetter = DeferredParse ()
type GlobalOption = Parser GlobalSetter
|
