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{- Generating and installing a desktop menu entry file
 - and a desktop autostart file. (And OSX equivilants.)
 -
 - Copyright 2012 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

{-# LANGUAGE CPP #-}

module Build.InstallDesktopFile where

import Utility.Exception
import Utility.FreeDesktop
import Utility.Path
import Utility.Monad
import Locations.UserConfig
import Utility.OSX
import Assistant.OSX

import Control.Applicative
import System.Directory
import System.Environment
import System.Posix.User
import System.Posix.Files
import System.FilePath

{- The command can be either just "git-annex", or the full path to use
 - to run it. -}
desktop :: FilePath -> DesktopEntry
desktop command = genDesktopEntry
	"Git Annex"
	"Track and sync the files in your Git Annex"
	False
	(command ++ " webapp")
	["Network", "FileTransfer"]

autostart :: FilePath -> DesktopEntry
autostart command = genDesktopEntry
	"Git Annex Assistant"
	"Autostart"
	False
	(command ++ " assistant --autostart")
	[]

isRoot :: IO Bool
isRoot = do
	uid <- fromIntegral <$> getRealUserID
	return $ uid == (0 :: Int)

inDestDir :: FilePath -> IO FilePath
inDestDir f = do
	destdir <- catchDefaultIO "" (getEnv "DESTDIR")
	return $ destdir </> f

writeFDODesktop :: FilePath -> IO ()
writeFDODesktop command = do
	datadir <- ifM isRoot ( return systemDataDir, userDataDir )
	writeDesktopMenuFile (desktop command) 
		=<< inDestDir (desktopMenuFilePath "git-annex" datadir)

	configdir <- ifM isRoot ( return systemConfigDir, userConfigDir )
	writeDesktopMenuFile (autostart command) 
		=<< inDestDir (autoStartPath "git-annex" configdir)

writeOSXDesktop :: FilePath -> IO ()
writeOSXDesktop command = do
	installAutoStart command =<< inDestDir =<< ifM isRoot
		( return $ systemAutoStart autoStartLabel
		, userAutoStart autoStartLabel
		)

	{- Install the OSX app in non-self-contained mode. -}
	let appdir = "git-annex.app"
	installOSXAppFile appdir "Contents/Info.plist" Nothing
	installOSXAppFile appdir "Contents/Resources/git-annex.icns" Nothing
	installOSXAppFile appdir "Contents/MacOS/git-annex-webapp" (Just webappscript)
	where
		webappscript = unlines
			[ "#!/bin/sh"
			, command ++ " webapp"
			]

installOSXAppFile :: FilePath -> FilePath -> Maybe String -> IO ()
installOSXAppFile appdir appfile mcontent = do
	let src = "ui-macos" </> appdir </> appfile
	home <- myHomeDir
	dest <- ifM isRoot
		( return $ "/Applications" </> appdir </> appfile
		, return $ home </> "Desktop" </> appdir </> appfile
		)
	createDirectoryIfMissing True (parentDir dest)
	case mcontent of
		Just content -> writeFile dest content
		Nothing -> copyFile src dest
	mode <- fileMode <$> getFileStatus src
	setFileMode dest mode

install :: FilePath -> IO ()
install = do
#ifdef darwin_HOST_OS
	writeOSXDesktop
#else
	writeFDODesktop
#endif
	unlessM isRoot $ do
		programfile <- inDestDir =<< programFile
		createDirectoryIfMissing True (parentDir programfile)
		writeFile programfile command

main :: IO ()
main = getArgs >>= go
	where
		go [] = error "specify git-annex command"
		go (command:_) = install command