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+{-# LANGUAGE TemplateHaskell #-}
+
+-- | Separated-out main types of the deployment scriptage.
+module Types where
+
+import Control.Monad.Trans.State.Lazy
+import qualified Data.Map as M
+import qualified Data.Set as S
+import qualified Data.Yaml as Y
+import Lens.Micro.TH
+import qualified Text.Mustache as Mu
+import qualified Text.Pandoc.Definition
+
+-- | Information about a single deployed page (with metadata etc).
+data PageInfo =
+  PageInfo
+    { _pagePath :: FilePath -- ^ original path to the markdown file
+    , _pageMeta :: Y.Value -- ^ YAML metadata extracted from the file
+    , _pagePandoc :: Text.Pandoc.Definition.Pandoc -- ^ Page data
+    }
+  deriving (Show)
+
+makeLenses ''PageInfo
+
+-- | Complete internal state of the deployment process that holds all data
+data SiteState =
+  SiteState
+    -- | Map of page mounts to `PageInfo`
+    { _pages :: M.Map FilePath PageInfo
+    -- | Map of redirects (from -> to)
+    , _redirects :: M.Map FilePath FilePath
+    -- | Map of tags, assigning to each tag sequence a list of
+    -- tagged page mounts
+    , _htags :: M.Map [String] [FilePath]
+    -- | List of installed files (prevents overwriting)
+    , _installs :: S.Set FilePath
+    -- | Map of Mustache templates organized by template search path (within
+    -- the template directory)
+    , _templates :: M.Map FilePath Mu.Template
+    , _outputDir :: FilePath -- ^ Directory for output
+    , _defaultTemplate :: FilePath -- ^ Name of the default template
+    }
+  deriving (Show)
+
+makeLenses ''SiteState
+
+-- | Make a completely empty `SiteState` for the `Site` monad.
+emptySiteState =
+  SiteState
+    { _pages = M.empty
+    , _redirects = M.empty
+    , _htags = M.empty
+    , _installs = S.empty
+    , _templates = M.empty
+    , _outputDir = "_site"
+    , _defaultTemplate = "default.html"
+    }
+
+-- | Monad for running the site generator.
+type Site a = StateT SiteState IO a