blob: 93c0464f1bb0c68226c427d77cd741046af8b078 (
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
|
{- git-annex backend list
- -}
module BackendList (
supportedBackends,
parseBackendList,
lookupBackendName
) where
import BackendTypes
-- When adding a new backend, import it here and add it to the list.
import qualified Backend.Worm
import qualified Backend.Checksum
import qualified Backend.Url
supportedBackends =
[ Backend.Worm.backend
, Backend.Checksum.backend
, Backend.Url.backend
]
{- Parses a string with a list of backend names into
- a list of Backend objects. If the list is empty,
- defaults to supportedBackends. -}
parseBackendList :: String -> [Backend]
parseBackendList s =
if (length s == 0)
then supportedBackends
else map (lookupBackendName) $ words s
{- Looks up a supported backend by name. -}
lookupBackendName :: String -> Backend
lookupBackendName s =
if ((length matches) /= 1)
then error $ "unknown backend " ++ s
else matches !! 0
where matches = filter (\b -> s == name b) supportedBackends
|
