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diff --git a/compiler/src/Resource.hs b/compiler/src/Resource.hs
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+{-# LANGUAGE DuplicateRecordFields, DeriveGeneric, DeriveAnyClass #-}
+
+-- ldgallery - A static generator which turns a collection of tagged
+--             pictures into a searchable web gallery.
+--
+-- Copyright (C) 2019  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 Resource
+  ( ResourceTree(..)
+  , buildResourceTree
+  ) where
+
+
+import Data.Function ((&))
+import Files
+import Input
+
+
+-- | Tree representing the compiled gallery resources.
+data ResourceTree =
+    ItemResource
+      { sidecar :: Sidecar
+      , path :: Path
+      , itemThumbnailPath :: Path }
+  | DirResource
+      { items :: [ResourceTree]
+      , path :: Path
+      , dirThumbnailPath :: Maybe Path }
+  deriving Show
+
+
+  -- TODO: actually generate compilation strategies
+buildResourceTree :: InputTree -> ResourceTree
+buildResourceTree = resNode
+  where
+    resNode (InputFile path sidecar) =
+      ItemResource sidecar (itemsDir /> path) (thumbnailsDir /> path)
+
+    resNode (InputDir path thumbnailPath items) =
+      map resNode items
+      & \dirItems -> DirResource dirItems (itemsDir /> path) Nothing
+
+    itemsDir = "items"
+    thumbnailsDir = "thumbnails"