towards configurable keybindings

1 files changed, 38 insertions, 6 deletions

diff --git a/src/Lazymail/Keymap.hs b/src/Lazymail/Keymap.hs
index 1cef1b1..27dce60 100644
--- a/src/Lazymail/Keymap.hs
+++ b/src/Lazymail/Keymap.hs
@@ -1,16 +1,48 @@
+{- Lazymail default keymap.
+ -
+ - Copyright 2013 Raúl Benencia <rul@kalgan.cc>
+ -
+ - Licensed under the GNU GPL version 3 or higher
+ -}
+
 module Lazymail.Keymap
        ( defaultGlobalKeymap
        , defaultMaildirKeymap
        , defaultIndexKeymap
        , defaultEmailKeymap
        , defaultComposeKeymap
+       , findHandler
        ) where
 
-import UI.NCurses(Event(..))
-import Lazymail.Types(LazymailCurses)
+import UI.NCurses(Event(..), Key(..))
+
+import Lazymail.Types(Keymap, LazymailState(..), Mode(..), LazymailConfig(..))
+import Lazymail.Handlers(advanceMode, previousMode, scrollUp, scrollDown)
 
-defaultGlobalKeymap = []
+defaultGlobalKeymap = [ ([EventCharacter '\n', EventSpecialKey KeyRightArrow], advanceMode)
+                      , ([EventCharacter 'q', EventCharacter 'Q'], previousMode)
+                      , ([EventSpecialKey KeyUpArrow, EventCharacter 'k'], scrollUp)
+                      , ([EventSpecialKey KeyDownArrow, EventCharacter 'j'], scrollDown)
+                      ]
 defaultMaildirKeymap = []
-defaultIndexKeymap = []
-defaultEmailKeymap = []
-defaultComposeKeymap = []
\ No newline at end of file
+defaultIndexKeymap   = []
+defaultEmailKeymap   = []
+defaultComposeKeymap = []
+
+-- | Try to find a keymap for the current mode. If nothing is found, then
+--   try looking up in the global keymap.
+findHandler st cfg ev = case modeHandler (mode st) ev of
+  Nothing -> globalHandler ev
+  Just h  -> Just h -- I think I saw a way of using an as-pattern in this case
+  where
+    modeHandler MaildirMode = lookupHandler $ maildirModeKeymap cfg
+    modeHandler IndexMode   = lookupHandler $ indexModeKeymap  cfg
+    modeHandler EmailMode   = lookupHandler $ emailModeKeymap   cfg
+    modeHandler ComposeMode = lookupHandler $ composeModeKeymap cfg
+
+    globalHandler = lookupHandler $ globalKeymap cfg
+
+    lookupHandler [] _   = Nothing
+    lookupHandler (km:kms) ev
+      | elem ev (fst km) = Just $ snd km
+      | otherwise        = lookupHandler kms ev
\ No newline at end of file