1 -- | This module defines the 'Configuration' type, which is just a
2 -- wrapper around all of the configuration options we accept on the
10 import System.Console.CmdArgs.Default ( Default(..) )
12 import qualified OptionalConfiguration as OC ( OptionalConfiguration(..) )
14 -- | The main configuration data type. This will be passed to most of
15 -- the important functions once it has been created.
27 -- | A Configuration with all of its fields set to their default
29 instance Default Configuration where
32 database = "postfixadmin",
37 username = "postgres" }
39 -- | Merge a 'Configuration' with an 'OptionalConfiguration'. This is
40 -- more or less the Monoid instance for 'OptionalConfiguration', but
41 -- since the two types are different, we have to repeat ourselves.
42 merge_optional :: Configuration
43 -> OC.OptionalConfiguration
45 merge_optional cfg opt_cfg =
47 (merge (both cfg) (OC.both opt_cfg))
48 (merge (database cfg) (OC.database opt_cfg))
49 (merge (detail cfg) (OC.detail opt_cfg))
50 (merge (host cfg) (OC.host opt_cfg))
51 (merge (password cfg) (OC.password opt_cfg))
52 (merge (port cfg) (OC.port opt_cfg))
53 (merge (username cfg) (OC.username opt_cfg))
55 -- | If the thing on the right is Just something, return that
56 -- something, otherwise return the thing on the left.
57 merge :: a -> Maybe a -> a