mirrors/git-annex
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages 1 Wiki Activity Actions

use map for faster backend name lookup

Browse source
This commit is contained in:
Joey Hess 2014-07-27 12:24:12 -04:00
parent 85d17a698d
commit aad8cfe718
1 changed files with 7 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
Backend.hs
View file

@ -32,6 +32,8 @@ import qualified Backend.Hash
import qualified Backend.WORM import qualified Backend.WORM
import qualified Backend.URL import qualified Backend.URL
import qualified Data.Map as M
list :: [Backend] list :: [Backend]
list = Backend.Hash.backends ++ Backend.WORM.backends ++ Backend.URL.backends list = Backend.Hash.backends ++ Backend.WORM.backends ++ Backend.URL.backends
@ -116,7 +118,9 @@ lookupBackendName :: String -> Backend
lookupBackendName s = fromMaybe unknown $ maybeLookupBackendName s lookupBackendName s = fromMaybe unknown $ maybeLookupBackendName s
where where
unknown = error $ "unknown backend " ++ s unknown = error $ "unknown backend " ++ s
maybeLookupBackendName :: String -> Maybe Backend maybeLookupBackendName :: String -> Maybe Backend
maybeLookupBackendName s = headMaybe matches maybeLookupBackendName s = M.lookup s nameMap
where
matches = filter (\b -> s == B.name b) list nameMap :: M.Map String Backend
nameMap = M.fromList $ zip (map B.name list) list