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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.Install.AutoStart

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

{- 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")
	[]

systemwideInstall :: IO Bool
systemwideInstall = isroot <||> destdirset
	where
		isroot = do
			uid <- fromIntegral <$> getRealUserID
			return $ uid == (0 :: Int)
		destdirset = isJust <$> catchMaybeIO (getEnv "DESTDIR")

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

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

	configdir <- ifM systemwideInstall ( return systemConfigDir, userConfigDir )
	installAutoStart command 
		=<< inDestDir (autoStartPath "git-annex" configdir)

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

	{- 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 = "standalone" </> "osx" </> appdir </> appfile
	home <- myHomeDir
	dest <- ifM systemwideInstall
		( 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 command = do
#ifdef darwin_HOST_OS
	writeOSXDesktop command
#else
	writeFDODesktop command
#endif
	ifM systemwideInstall
		( return ()
		, 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