module Yi.Keymap.Vim.Ex.Commands.Buffer (parse) where
import Control.Applicative
import Control.Monad
import Control.Monad.State
import qualified Data.Text as T
import qualified Text.ParserCombinators.Parsec as P
import Yi.Buffer.Basic
import Yi.Buffer.Misc
import Yi.Editor
import Yi.Keymap
import Yi.Keymap.Vim.Common
import qualified Yi.Keymap.Vim.Ex.Commands.Common as Common
import Yi.Keymap.Vim.Ex.Types
parse :: EventString -> Maybe ExCommand
parse = Common.parseWithBangAndCount nameParser $ \ _ bang mcount -> do
bufIdent <- P.try ( P.many1 P.digit <|> bufferSymbol) <|>
P.many1 P.space *> P.many P.anyChar <|>
P.eof *> return ""
return $ Common.pureExCommand {
cmdShow = "buffer"
, cmdAction = EditorA $ do
unchanged <- withCurrentBuffer $ gets isUnchangedBuffer
if bang || unchanged
then case mcount of
Nothing -> switchToBuffer bufIdent
Just i -> switchByRef $ BufferRef i
else Common.errorNoWrite
}
where
bufferSymbol = P.string "%" <|> P.string "#"
nameParser :: P.GenParser Char () ()
nameParser = do
void $ P.try ( P.string "buffer") <|>
P.try ( P.string "buf") <|>
P.try ( P.string "bu") <|>
P.try ( P.string "b")
switchToBuffer :: String -> EditorM ()
switchToBuffer s =
case P.parse bufferRef "" s of
Right ref -> switchByRef ref
Left _e -> switchByName s
where
bufferRef = BufferRef . read <$> P.many1 P.digit
switchByName :: String -> EditorM ()
switchByName "" = return ()
switchByName "%" = return ()
switchByName "#" = switchToBufferWithNameE ""
switchByName bufName = switchToBufferWithNameE (T.pack bufName)
switchByRef :: BufferRef -> EditorM ()
switchByRef ref = do
mBuf <- findBuffer ref
maybe (return ()) (switchToBufferE . bkey) mBuf