import System.Console.CmdArgs.Default ( Default(..) )
import System.Log ( Priority( INFO ) )
-import qualified OptionalConfiguration as OC (OptionalConfiguration(..))
+import qualified OptionalConfiguration as OC (
+ OptionalConfiguration(..),
+ merge_maybes )
import TSN.FeedHosts (FeedHosts(..))
data Configuration =
Configuration {
feed_hosts :: FeedHosts,
- log_file :: FilePath,
+ log_file :: Maybe FilePath,
log_level :: Priority,
password :: String,
output_directory :: FilePath,
-- | A Configuration with all of its fields set to their default
-- values.
instance Default Configuration where
- def = Configuration def "htsn.log" INFO def "." True def
+ def = Configuration def def INFO def "." def def
-- | Merge a Configuration with an OptionalConfiguration. This is more
merge_optional cfg opt_cfg =
Configuration
all_feed_hosts
- (merge (log_file cfg) (OC.log_file opt_cfg))
+ (OC.merge_maybes (log_file cfg) (OC.log_file opt_cfg))
(merge (log_level cfg) (OC.log_level opt_cfg))
(merge (password cfg) (OC.password opt_cfg))
(merge (output_directory cfg) (OC.output_directory opt_cfg))
(merge (syslog cfg) (OC.syslog opt_cfg))
(merge (username cfg) (OC.username opt_cfg))
where
+ -- | If the thing on the right is Just something, return that
+ -- something, otherwise return the thing on the left.
merge :: a -> Maybe a -> a
merge x Nothing = x
merge _ (Just y) = y