{--
HSFM, a filemanager written in Haskell.
Copyright (C) 2016 Julian Ospald

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
--}


{-# OPTIONS_HADDOCK ignore-exports #-}
{-# OPTIONS_GHC -Wno-unused-imports #-}


module HSFM.GUI.Gtk.Plugins where


import Graphics.UI.Gtk
import HPath
import HSFM.FileSystem.FileType
import HSFM.GUI.Gtk.Data
import HSFM.GUI.Gtk.Settings
import HSFM.GUI.Gtk.Utils
import HSFM.Settings
import Control.Monad
  (
    forM
  , forM_
  , void
  )
import System.Posix.Process.ByteString
  (
    executeFile
  , forkProcess
  )
import Data.ByteString.UTF8
  (
    fromString
  )
import qualified Data.ByteString as BS





    ---------------
    --[ Plugins ]--
    ---------------




---- Global settings ----



-- |Where to start inserting plugins.
insertPos :: Int
insertPos = 4


-- |A list of plugins to add to the right-click menu at position
-- `insertPos`.
--
-- The left part of the triple is a function that returns the menuitem.
-- The middle part of the triple is a filter function that
-- decides whether the item is shown.
-- The right part of the triple is the callback, which is invoked
-- when the menu item is clicked.
--
-- Plugins are added in order of this list.
myplugins :: [(IO MenuItem
              ,[Item] -> MyGUI -> MyView -> IO Bool
              ,[Item] -> MyGUI -> MyView -> IO ())
             ]
myplugins = [(diffItem, diffFilter, diffCallback)
            ]





---- The plugins ----



diffItem :: IO MenuItem
diffItem = menuItemNewWithLabel "diff"

diffFilter :: [Item] -> MyGUI -> MyView -> IO Bool
diffFilter items _ _
  | length items > 1 = return $ and $ fmap isFileC items
  | otherwise        = return False

diffCallback :: [Item] -> MyGUI -> MyView -> IO ()
diffCallback items _ _ = void $
  forkProcess $
    executeFile
      (fromString "meld")
      True
      ([fromString "--diff"] ++ fmap (fromAbs . path) items)
      Nothing