{-# LANGUAGE OverloadedStrings #-}
{-# OPTIONS_HADDOCK show-extensions #-}

-- |
-- Module      :  Yi.Keymap.Vim.Ex.Commands.Edit
-- License     :  GPL-2
-- Maintainer  :  yi-devel@googlegroups.com
-- Stability   :  experimental
-- Portability :  portable
--
-- Implements quit commands.

module Yi.Keymap.Vim.Ex.Commands.Edit (parse) where

import           Control.Applicative              (Alternative ((<|>)))
import           Control.Monad                    (void, when)
import           Data.Maybe                       (isJust)
import qualified Data.Text                        as T (Text, append, pack, unpack, null)
import qualified Data.Attoparsec.Text             as P (anyChar, many', many1, space, string, try, option)
import           Yi.Editor                        (MonadEditor (withEditor), newTabE)
import           Yi.File                          (openNewFile)
import           Yi.Keymap                        (Action (YiA))
import           Yi.Keymap.Vim.Common             (EventString)
import qualified Yi.Keymap.Vim.Ex.Commands.Common as Common (filenameComplete, impureExCommand, parse)
import           Yi.Keymap.Vim.Ex.Types           (ExCommand (cmdAction, cmdComplete, cmdShow))
import           Yi.Editor                        (printMsg)

parse :: EventString -> Maybe ExCommand
parse :: EventString -> Maybe ExCommand
parse = Parser ExCommand -> EventString -> Maybe ExCommand
Common.parse (Parser ExCommand -> EventString -> Maybe ExCommand)
-> Parser ExCommand -> EventString -> Maybe ExCommand
forall a b. (a -> b) -> a -> b
$ do
    tab <- Maybe Text -> Parser Text (Maybe Text) -> Parser Text (Maybe Text)
forall (f :: * -> *) a. Alternative f => a -> f a -> f a
P.option Maybe Text
forall a. Maybe a
Nothing (Parser Text (Maybe Text) -> Parser Text (Maybe Text))
-> Parser Text (Maybe Text) -> Parser Text (Maybe Text)
forall a b. (a -> b) -> a -> b
$ Text -> Maybe Text
forall a. a -> Maybe a
Just (Text -> Maybe Text)
-> Parser Text Text -> Parser Text (Maybe Text)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Text -> Parser Text Text
P.string Text
"tab"
    void $ P.try (P.string "edit") <|> P.string "e"
    void $ P.many1 P.space
    filename <- T.pack <$> P.many' P.anyChar
    return $! edit (isJust tab) filename

edit :: Bool -> T.Text -> ExCommand
edit :: Bool -> Text -> ExCommand
edit Bool
tab Text
f = ExCommand
Common.impureExCommand {
    cmdShow = showEdit tab f
  , cmdAction = YiA $
        if T.null f
          then printMsg "No file name"
          else do
            when tab $ withEditor newTabE
            openNewFile $ T.unpack f
  , cmdComplete = (fmap . fmap)
                    (showEdit tab) (Common.filenameComplete f)
  }

showEdit :: Bool -> T.Text -> T.Text
showEdit :: Bool -> Text -> Text
showEdit Bool
tab Text
f = (if Bool
tab then Text
"tab" else Text
"") Text -> Text -> Text
`T.append` Text
"edit " Text -> Text -> Text
`T.append` Text
f