refactor(users/glittershark): Rename to grfn

Rename my //users directory and all places that refer to glittershark to
grfn, including nix references and documentation.

This may require some extra attention inside of gerrit's database after
it lands to allow me to actually push things.

Change-Id: I4728b7ec2c60024392c1c1fa6e0d4a59b3e266fa
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2933
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: glittershark <grfn@gws.fyi>

users/grfn/xanthous/src/Xanthous/Command.hs

@@ -0,0 +1,73 @@
+--------------------------------------------------------------------------------
+module Xanthous.Command where
+--------------------------------------------------------------------------------
+import Xanthous.Prelude hiding (Left, Right, Down)
+--------------------------------------------------------------------------------
+import Graphics.Vty.Input (Key(..), Modifier(..))
+import qualified Data.Char as Char
+--------------------------------------------------------------------------------
+import Xanthous.Data (Direction(..))
+--------------------------------------------------------------------------------
+
+data Command
+  = Quit
+  | Move Direction
+  | StartAutoMove Direction
+  | PreviousMessage
+  | PickUp
+  | Drop
+  | Open
+  | Close
+  | Wait
+  | Eat
+  | Look
+  | Save
+  | Read
+  | ShowInventory
+  | Wield
+  | GoUp
+  | GoDown
+
+    -- | TODO replace with `:` commands
+  | ToggleRevealAll
+
+commandFromKey :: Key -> [Modifier] -> Maybe Command
+commandFromKey (KChar 'q') [] = Just Quit
+commandFromKey (KChar '.') [] = Just Wait
+commandFromKey (KChar (directionFromChar -> Just dir)) [] = Just $ Move dir
+commandFromKey (KChar c) []
+  | Char.isUpper c
+  , Just dir <- directionFromChar $ Char.toLower c
+  = Just $ StartAutoMove dir
+commandFromKey (KChar 'p') [MCtrl] = Just PreviousMessage
+commandFromKey (KChar ',') [] = Just PickUp
+commandFromKey (KChar 'd') [] = Just Drop
+commandFromKey (KChar 'o') [] = Just Open
+commandFromKey (KChar 'c') [] = Just Close
+commandFromKey (KChar ';') [] = Just Look
+commandFromKey (KChar 'e') [] = Just Eat
+commandFromKey (KChar 'S') [] = Just Save
+commandFromKey (KChar 'r') [] = Just Read
+commandFromKey (KChar 'i') [] = Just ShowInventory
+commandFromKey (KChar 'w') [] = Just Wield
+commandFromKey (KChar '<') [] = Just GoUp
+commandFromKey (KChar '>') [] = Just GoDown
+
+-- DEBUG COMMANDS --
+commandFromKey (KChar 'r') [MMeta] = Just ToggleRevealAll
+
+commandFromKey _ _ = Nothing
+
+--------------------------------------------------------------------------------
+
+directionFromChar :: Char -> Maybe Direction
+directionFromChar 'h' = Just Left
+directionFromChar 'j' = Just Down
+directionFromChar 'k' = Just Up
+directionFromChar 'l' = Just Right
+directionFromChar 'y' = Just UpLeft
+directionFromChar 'u' = Just UpRight
+directionFromChar 'b' = Just DownLeft
+directionFromChar 'n' = Just DownRight
+directionFromChar '.' = Just Here
+directionFromChar _   = Nothing