1 files changed, 57 insertions, 0 deletions
diff --git a/src/Config.hs b/src/Config.hs
new file mode 100644
index 0000000..b025106
--- /dev/null
+++ b/src/Config.hs
@@ -0,0 +1,57 @@
+-- Copyright 2016 Benjamin Barenblat
+--
+-- Licensed under the Apache License, Version 2.0 (the “License”); you may not
+-- use this file except in compliance with the License.  You may obtain a copy
+-- of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an “AS IS” BASIS, WITHOUT
+-- WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+-- License for the specific language governing permissions and limitations under
+-- the License.
+
+-- | Application configuration.
+
+module Config
+    ( Config(..)
+    , load
+    ) where
+
+import Control.Applicative ((<$>))
+import Data.Bifunctor (bimap)
+import qualified Data.ConfigFile as ConfigFile
+
+data Config = Config
+    { stopCapacity :: Int
+        -- ^ percentage charge required to enter the “fully charged” state
+    , stopCurrent :: Int
+        -- ^ maximum charge current (in microamperes, µA) to remain in the
+        -- “fully charged” state
+    , startCapacity :: Int
+        -- ^ percentage at or below which charging will begin
+    } deriving (Eq, Show)
+
+defaultConfig :: Config
+defaultConfig = Config
+    { stopCapacity = 99
+    , stopCurrent = 80000
+    , startCapacity = 95
+    }
+
+configFilePath :: FilePath
+configFilePath = "/etc/pndpowerd.conf"
+
+load :: IO (Either String Config)
+load =
+    bimap show parse <$> ConfigFile.readfile ConfigFile.emptyCP configFilePath
+
+parse :: ConfigFile.ConfigParser -> Config
+parse serialized =
+    let get field name = either (const $ field defaultConfig) id $
+            ConfigFile.get serialized "DEFAULT" name
+    in Config { stopCapacity = get stopCapacity "stopCapacity"
+              , stopCurrent = get stopCurrent "stopCurrent"
+              , startCapacity = get startCapacity "startCapacity"
+              }