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diff --git a/compiler/src/Config.hs b/compiler/src/Config.hs
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+++ b/compiler/src/Config.hs
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+-- ldgallery - A static generator which turns a collection of tagged
+--             pictures into a searchable web gallery.
+--
+-- Copyright (C) 2019-2020  Pacien TRAN-GIRARD
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU Affero General Public License as
+-- published by the Free Software Foundation, either version 3 of the
+-- License, or (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU Affero General Public License for more details.
+--
+-- You should have received a copy of the GNU Affero General Public License
+-- along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+module Config
+  ( GalleryConfig(..)
+  , CompilerConfig(..)
+  , readConfig
+  ) where
+
+
+import GHC.Generics (Generic)
+import Data.Aeson (FromJSON, withObject, (.:?), (.!=))
+import qualified Data.Aeson as JSON
+
+import Files (FileName)
+import Input (decodeYamlFile)
+import Resource (Resolution(..))
+
+
+data CompilerConfig = CompilerConfig
+  { galleryName :: String
+  , includeFiles :: [String]
+  , excludeFiles :: [String]
+  , tagsFromDirectories :: Int
+  , thumbnailMaxResolution :: Resolution
+  , pictureMaxResolution :: Maybe Resolution
+  } deriving (Generic, Show)
+
+instance FromJSON CompilerConfig where
+  parseJSON = withObject "CompilerConfig" $ \v -> CompilerConfig
+    <$> v .:? "galleryName" .!= "Gallery"
+    <*> v .:? "includeFiles" .!= ["*"]
+    <*> v .:? "excludeFiles" .!= []
+    <*> v .:? "tagsFromDirectories" .!= 0
+    <*> v .:? "thumbnailMaxResolution" .!= (Resolution 400 400)
+    <*> v .:? "pictureMaxResolution"
+
+
+data GalleryConfig = GalleryConfig
+  { compiler :: CompilerConfig
+  , viewer :: JSON.Object
+  } deriving (Generic, FromJSON, Show)
+
+readConfig :: FileName -> IO GalleryConfig
+readConfig = decodeYamlFile