module Yi.Keymap.Vim.Ex.Commands.Help (parse) where
import Control.Applicative ((<$>))
import Control.Monad (void)
import qualified Data.Text as T (append, pack)
import qualified Text.ParserCombinators.Parsec as P (anyChar, many1, option, space, string, try)
import Yi.Command.Help (displayHelpFor)
import Yi.Keymap (Action (YiA))
import Yi.Keymap.Vim.Common (EventString)
import qualified Yi.Keymap.Vim.Ex.Commands.Common as Common (impureExCommand, parse)
import Yi.Keymap.Vim.Ex.Types (ExCommand (cmdAction, cmdShow))
parse :: EventString -> Maybe ExCommand
parse = Common.parse $ do
void $ P.string "help"
cmd <- P.option "" $ P.try $ do
void $ P.many1 P.space
T.pack <$> P.many1 P.anyChar
return $! Common.impureExCommand {
cmdAction = YiA $ displayHelpFor cmd
, cmdShow = "help" `T.append`
if cmd == ""
then ""
else " " `T.append` cmd
}