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+{- Git configuration
+ -
+ - Copyright 2011 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Config where
+
+import Data.Maybe
+import Control.Monad.State (liftIO)
+
+import qualified GitRepo as Git
+import qualified Annex
+import Types
+import Utility
+
+type ConfigKey = String
+
+{- Changes a git config setting in both internal state and .git/config -}
+setConfig :: ConfigKey -> String -> Annex ()
+setConfig k value = do
+	g <- Annex.gitRepo
+	liftIO $ Git.run g "config" [Param k, Param value]
+	-- re-read git config and update the repo's state
+	g' <- liftIO $ Git.configRead g
+	Annex.changeState $ \s -> s { Annex.repo = g' }
+
+{- Looks up a per-remote config setting in git config.
+ - Failing that, tries looking for a global config option. -}
+getConfig :: Git.Repo -> ConfigKey -> String -> Annex String
+getConfig r key def = do
+	g <- Annex.gitRepo
+	let def' = Git.configGet g global def
+	return $ Git.configGet g local def'
+	where
+		local = "remote." ++ fromMaybe "" (Git.repoRemoteName r) ++ ".annex-" ++ key
+		global = "annex." ++ key
+
+{- Calculates cost for a remote.
+ -
+ - The default cost is 100 for local repositories, and 200 for remote
+ - repositories; it can also be configured by remote.<name>.annex-cost
+ -}
+remoteCost :: Git.Repo -> Annex Int
+remoteCost r = do
+	c <- getConfig r "cost" ""
+	if not $ null c
+		then return $ read c
+		else if not $ Git.repoIsUrl r
+			then return 100
+			else return 200
+
+{- Checks if a repo should be ignored, based either on annex-ignore
+ - setting, or on command-line options. Allows command-line to override
+ - annex-ignore. -}
+remoteNotIgnored :: Git.Repo -> Annex Bool
+remoteNotIgnored r = do
+	ignored <- getConfig r "ignore" "false"
+	to <- match Annex.toremote
+	from <- match Annex.fromremote
+	if to || from
+		then return True
+		else return $ not $ Git.configTrue ignored
+	where
+		match a = do
+			n <- Annex.getState a
+			return $ n == Git.repoRemoteName r