src/Configuration.hs

   1 -- | This module defines the 'Cfg' type, which is just a wrapper
   2 --   around all of the configuration options we accept on the command
   3 --   line. We thread this throughout the rest of the program.
   4 --
   5
   6 module Configuration (
   7   Cfg(..)
   8 )
   9 where
  10
  11 import qualified OptionalConfiguration as OC
  12
  13 data Cfg =
  14   Cfg { consumer_key :: String,
  15         consumer_secret :: String,
  16         access_token :: String,
  17         access_secret :: String,
  18         heartbeat :: Int,
  19         ignore_replies :: Bool,
  20         ignore_retweets :: Bool,
  21         sendmail_path :: String,
  22         from_address :: Maybe String,
  23         to_address :: Maybe String,
  24         verbose :: Bool }
  25
  26
  27
  28 default_config :: Cfg
  29 default_config =
  30   Cfg { consumer_key = "",
  31         consumer_secret = "",
  32         access_token = "",
  33         access_secret = "",
  34         heartbeat = 600,
  35         ignore_replies = False,
  36         ignore_retweets = False,
  37         sendmail_path = "/usr/sbin/sendmail",
  38         from_address = Nothing,
  39         to_address = Nothing,
  40         verbose = False }
  41
  42 merge_optional :: Cfg -> OC.OptionalCfg -> Cfg
  43 merge_optional cfg opt_cfg =
  44   Cfg
  45     (merge (consumer_key cfg) (OC.consumer_key opt_cfg))
  46     (merge (consumer_secret cfg) (OC.consumer_secret opt_cfg))
  47     (merge (access_token cfg) (OC.access_token opt_cfg))
  48     (merge (access_secret cfg) (OC.access_secret opt_cfg))
  49     (merge (heartbeat cfg) (OC.heartbeat opt_cfg))
  50     (merge (ignore_replies cfg) (OC.ignore_replies opt_cfg))
  51     (merge (ignore_retweets cfg) (OC.ignore_retweets opt_cfg))
  52     (merge (sendmail_path cfg) (OC.sendmail_path opt_cfg))
  53     (merge' (from_address cfg) (OC.from_address opt_cfg))
  54     (merge' (to_address cfg) (OC.to_address opt_cfg))
  55     (merge (verbose cfg) (OC.verbose opt_cfg))
  56   where
  57     merge :: a -> Maybe a -> a
  58     merge x Nothing  = x
  59     merge _ (Just y) = y
  60
  61     -- Used for the to/from address
  62     merge' :: Maybe a -> Maybe a -> Maybe a
  63     merge' Nothing Nothing = Nothing
  64     merge' (Just x) Nothing  = Just x
  65     merge' Nothing (Just x)  = Just x
  66     merge' (Just _) (Just y) = Just y