--
-- Copyright (c) 2005,2007,2008 Jean-Philippe Bernardy
--
--

-- This module aims at a mode that should be (mostly) intuitive to
-- emacs users, but mapping things into the Yi world when
-- convenient. Hence, do not go into the trouble of trying 100%
-- emulation. For example, M-x gives access to Yi (Haskell) functions,
-- with their native names.

module Yi.Keymap.Emacs
  ( keymap
  , makeKeymap
  )
where
import Control.Applicative
import Yi.Buffer
import Yi.Buffer.HighLevel
import Yi.Buffer.Normal
import Yi.Core
import Yi.Dired
import Yi.Editor
import Yi.Keymap.Keys
import Yi.File
import Yi.Misc

import Yi.TextCompletion
import Yi.Keymap.Keys
import Yi.Keymap.Emacs.Keys
import Yi.Keymap.Emacs.KillRing
import Yi.Keymap.Emacs.UnivArgument
import Yi.Keymap.Emacs.Utils
  ( askQuitEditor
  , adjIndent
  , evalRegionE
  , executeExtendedCommandE
  , findFile
  , insertNextC
  , insertSelf
  , isearchKeymap
  , killBufferE
  , queryReplaceE
  , readArgC
  , scrollDownE
  , scrollUpE
  , cabalConfigureE
  , switchBufferE
  , withMinibuffer
  )
import Yi.Accessor
import Yi.Buffer
import Yi.Buffer.Normal
import Data.Maybe

import Control.Monad
import Control.Applicative

keymap :: Keymap
keymap = selfInsertKeymap <|> makeKeymap keys <|> completionKm

selfInsertKeymap :: Keymap
selfInsertKeymap = do
  c <- printableChar
  write (adjBlock 1 >> insertSelf c)

completionKm :: Keymap
completionKm = do some (adjustPriority (-1) (meta (char '/') ?>>! wordComplete))
                  write resetComplete
           -- 'adjustPriority' is there to lift the ambiguity between "continuing" completion
           -- and resetting it (restarting at the 1st completion).


placeMark :: BufferM ()
placeMark = do
  setA highlightSelectionA True
  pointB >>= setSelectionMarkPointB

deleteB' :: YiM ()
deleteB' = do
  (adjBlock (-1) >> withBuffer (deleteN 1))

keys :: KList
keys = 
   [ ( "TAB",      write $ adjIndent DecreaseCycle)
   , ( "S-TAB",    write $ adjIndent IncreaseCycle)
   , ( "RET",      write $ repeatingArg $ insertB '\n')
   , ( "DEL",      write $ repeatingArg deleteB')
   , ( "BACKSP",   write $ repeatingArg (adjBlock (-1) >> withBuffer bdeleteB))
   , ( "C-M-w",    write $ appendNextKillE)
   , ( "C-/",      write $ repeatingArg undoB)
   , ( "C-_",      write $ repeatingArg undoB)
   , ( "C-<left>", write $ repeatingArg prevWordB)
   , ( "C-<right>",write $ repeatingArg nextWordB)
   , ( "C-<home>", write $ repeatingArg topB)
   , ( "C-<end>",  write $ repeatingArg botB)
   , ( "C-@",      write $ placeMark)
   , ( "C-SPC",    write $ placeMark)
   , ( "C-a",      write $ repeatingArg (maybeMoveB Line Backward))
   , ( "C-b",      write $ repeatingArg leftB)
   , ( "C-d",      write $ repeatingArg deleteB')
   , ( "C-e",      write $ repeatingArg (maybeMoveB Line Forward))
   , ( "C-f",      write $ repeatingArg rightB)
   , ( "C-g",      write $ setVisibleSelection False)               
   , ( "C-i",      write $ adjIndent IncreaseOnly)
   , ( "C-j",      write $ repeatingArg $ insertB '\n')
   , ( "C-k",      write $ killLineE)
   , ( "C-m",      write $ repeatingArg $ insertB '\n')
   , ( "C-n",      write $ repeatingArg $ moveB VLine Forward)
   , ( "C-o",      write $ repeatingArg (insertB '\n' >> leftB))
   , ( "C-p",      write $ repeatingArg $ moveB VLine Backward)
   , ( "C-q",              insertNextC)
   , ( "C-r",      isearchKeymap Backward)
   , ( "C-s",      isearchKeymap Forward)
   , ( "C-t",      write $ repeatingArg $ swapB)
   , ( "C-u",      readArgC)
   , ( "C-v",      write $ scrollDownE)
   , ( "M-v",      write $ scrollUpE)
   , ( "C-w",      write $ killRegion)
   , ( "C-z",      write $ suspendEditor)
   , ( "C-x C-o",  write deleteBlankLinesB)
   , ( "C-x ^",    write $ repeatingArg enlargeWinE)
   , ( "C-x 0",    write $ closeWindow)
   , ( "C-x 1",    write $ closeOtherE)
   , ( "C-x 2",    write $ splitE)
   , ( "C-x C-c",  write $ askQuitEditor)
   , ( "C-x C-f",  write $ findFile)
   , ( "C-x C-s",  write $ fwriteE)
   , ( "C-x C-w",  write $ withMinibuffer "Write file: "
                                           (matchingFileNames Nothing)
                                           fwriteToE
     )
   , ( "C-x C-x",  write $ (exchangePointAndMarkB >> setA highlightSelectionA True))
   , ( "C-x b",    write $ switchBufferE)
   , ( "C-x d",    write $ dired)
   , ( "C-x e e",  write $ evalRegionE)
   , ( "C-x o",    write $ nextWinE)
   , ( "C-x k",    write $ killBufferE)
-- , ( "C-x r k",  write $ killRectE)
-- , ( "C-x r o",  write $ openRectE)
-- , ( "C-x r t",  write $ stringRectE)
-- , ( "C-x r y",  write $ yankRectE)
   , ( "C-x u",    write $ repeatingArg undoB)
   , ( "C-x v",    write $ repeatingArg shrinkWinE)
   , ( "C-y",      write $ yankE)
   , ( "M-!",      write $ shellCommandE)
   , ( "M-p",      write $ cabalConfigureE)
   , ( "M-<",      write $ repeatingArg topB)
   , ( "M->",      write $ repeatingArg botB)
   , ( "M-%",      write $ queryReplaceE)
   , ( "M-BACKSP", write $ repeatingArg bkillWordB)
-- , ( "M-a",      write $ repeatingArg backwardSentenceE)
   , ( "M-b",      write $ repeatingArg prevWordB)
   , ( "M-c",      write $ repeatingArg capitaliseWordB)
   , ( "M-d",      write $ repeatingArg killWordB)
-- , ( "M-e",      write $ repeatingArg forwardSentenceE)
   , ( "M-f",      write $ repeatingArg nextWordB)
   , ( "M-g g",    write $ gotoLn)
-- , ( "M-h",      write $ repeatingArg markParagraphE)
-- , ( "M-k",      write $ repeatingArg killSentenceE)
   , ( "M-l",      write $ repeatingArg lowercaseWordB)
   , ( "M-q",      write $ withSyntax modePrettify)
   , ( "M-u",      write $ repeatingArg uppercaseWordB)
   , ( "M-t",      write $ repeatingArg $ transposeB Word Forward)
   , ( "M-w",      write $ killRingSaveE)
   , ( "M-x",      write $ executeExtendedCommandE)
   , ( "M-y",      write $ yankPopE)
   , ( "<home>",   write $ repeatingArg moveToSol)
   , ( "<end>",    write $ repeatingArg moveToEol)
   , ( "<left>",   write $ repeatingArg leftB)
   , ( "<right>",  write $ repeatingArg rightB)
   , ( "<up>",     write $ repeatingArg (moveB VLine Backward))
   , ( "<down>",   write $ repeatingArg (moveB VLine Forward))
   , ( "C-<up>",   write $ repeatingArg $ prevNParagraphs 1)
   , ( "C-<down>", write $ repeatingArg $ nextNParagraphs 1)
   , ( "<next>",   write $ repeatingArg downScreenB)
   , ( "<prior>",  write $ repeatingArg upScreenB)
  ]