{- Generates a NullSoft installer program for git-annex on Windows.
 - 
 - To build the installer, git-annex should already be built by cabal,
 - and ssh and rsync, as well as cygwin libraries, already installed.
 -
 - This uses the Haskell nsis package (cabal install nsis)
 - to generate a .nsi file, which is then used to produce
 - git-annex-installer.exe
 - 
 - The installer includes git-annex, and utilities it uses, with the
 - exception of git. The user needs to install git separately,
 - and the installer checks for that.
 -
 - Copyright 2013 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

{-# LANGUAGE OverloadedStrings #-}

import Development.NSIS
import System.FilePath
import Control.Monad
import System.Directory
import Data.String

import Utility.Tmp
import Utility.CopyFile
import Utility.SafeCommand
import Build.BundledPrograms

main = do
	withTmpDir "nsis-build" $ \tmpdir -> do
		let gitannex = tmpdir </> "git-annex.exe"
		mustSucceed "ln" [File "dist/build/git-annex/git-annex.exe", File gitannex]
		writeFile nsifile $ makeInstaller gitannex
		mustSucceed "C:\\Program Files\\NSIS\\makensis" [File nsifile]
	removeFile nsifile -- left behind if makensis fails
  where
	nsifile = "git-annex.nsi"
	mustSucceed cmd params = do
		r <- boolSystem cmd params
		case r of
			True -> return ()
			False -> error $ cmd ++ "failed"

installer :: FilePath
installer = "git-annex-installer.exe"

gitInstallDir :: Exp FilePath
gitInstallDir = fromString "$PROGRAMFILES\\Git\\cmd"

needGit :: Exp String
needGit = strConcat
	[ fromString "You need git installed to use git-annex. Looking at "
	, gitInstallDir
	, fromString " , it seems to not be installed, "
	, fromString "or may be installed in another location. "
	, fromString "You can install git from http:////git-scm.com//"
	]

makeInstaller :: FilePath -> String
makeInstaller gitannex = nsis $ do
	name "git-annex"
	outFile $ str installer
	{- Installing into the same directory as git avoids needing to modify
 	 - path myself, since the git installer already does it. -}
	installDir gitInstallDir
	requestExecutionLevel User

	iff (fileExists gitInstallDir)
		(return ())
		(alert needGit)
	
	-- Pages to display
	page Directory                   -- Pick where to install
	page InstFiles                   -- Give a progress bar while installing
	-- Groups of files to install
	section "programs" [] $ do
		setOutPath "$INSTDIR"
		addfile gitannex
		mapM_ addcygfile cygwinPrograms
	section "DLLS" [] $ do
		setOutPath "$INSTDIR"
		mapM_ addcygfile cygwinDlls
  where
	addfile f = file [] (str f)
	addcygfile f = addfile $ "C:\\cygwin\\bin" </> f

cygwinPrograms :: [FilePath]
cygwinPrograms = map (\p -> p ++ ".exe") bundledPrograms

-- These are the dlls needed by Cygwin's rsync, ssh, etc.
cygwinDlls :: [FilePath]
cygwinDlls =
	[ "cygwin1.dll"
	, "cygasn1-8.dll"
	, "cygheimbase-1.dll"
	, "cygroken-18.dll"
	, "cygcom_err-2.dll"
	, "cygheimntlm-0.dll"
	, "cygsqlite3-0.dll"
	, "cygcrypt-0.dll"
	, "cyghx509-5.dll"
	, "cygssp-0.dll"
	, "cygcrypto-1.0.0.dll"
	, "cygiconv-2.dll"
	, "cyggcc_s-1.dll"
	, "cygintl-8.dll"
	, "cygwind-0.dll"
	, "cyggssapi-3.dll"
	, "cygkrb5-26.dll"
	, "cygz.dll"
	]