@echo off

set path=%~dp0Ghostgum\gsview;%path%

rem test whether a lock entry exists in the Registry
reg query HKCU\Software\TeX-portable 2>nul 1>nul || (
  echo There is nothing to be reset. Aborting...
  echo.
  pause
  exit
)

echo.
echo **********************************************************************
echo ** IMPORTANT: Make sure that all instances of Yap have been closed! **
echo **            GSview will close automatically.                      **
echo **********************************************************************
echo.
pause

rem close all instances of GSview
gsview32 -x

cls
echo Please wait...

rem set version numbers
call "%~dp0versions.bat"

rem restore previous file associations
reg delete HKCU\Software\Classes\.dvi /f 2>nul 1>nul
reg query HKCU\Software\Classes\.dvi.bak 1>nul 2>nul && (
  reg copy HKCU\Software\Classes\.dvi.bak HKCU\Software\Classes\.dvi /s /f 2>nul 1>nul
  reg delete HKCU\Software\Classes\.dvi.bak /f 2>nul 1>nul
)

reg delete HKCU\Software\Classes\.ps /f 2>nul 1>nul
reg query HKCU\Software\Classes\.ps.bak 1>nul 2>nul && (
  reg copy HKCU\Software\Classes\.ps.bak HKCU\Software\Classes\.ps /s /f 2>nul 1>nul
  reg delete HKCU\Software\Classes\.ps.bak /f 2>nul 1>nul
)

reg delete HKCU\Software\Classes\.eps /f 2>nul 1>nul
reg query HKCU\Software\Classes\.eps.bak 1>nul 2>nul && (
  reg copy HKCU\Software\Classes\.eps.bak HKCU\Software\Classes\.eps /s /f 2>nul 1>nul
  reg delete HKCU\Software\Classes\.eps.bak /f 2>nul 1>nul
)

reg delete HKCU\Software\Classes\my_dvifile /f 2>nul 1>nul
reg delete HKCU\Software\Classes\my_psfile /f 2>nul 1>nul

rem dump current MiKTeX settings to <b>.MiKTeX.reg' on the USB drive
reg query HKCU\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION% 1>nul 2>nul && (
  reg export HKCU\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION% "%~dp0.MiKTeX.reg" 1>nul 2>nul
)

rem restore previous MiKTeX settings
reg delete HKCU\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION% /f 1>nul 2>nul
reg query HKCU\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION%.bak 1>nul 2>nul && (
  reg copy HKCU\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION%.bak HKCU\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION% /s /f 1>nul 2>nul
  reg delete HKCU\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION%.bak /f 1>nul 2>nul
)
reg query HKLM\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION%.bak 1>nul 2>nul && (
  reg query HKLM\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION% 1>nul 2>nul && (
    reg delete HKLM\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION% /f 1>nul 2>nul
  )
  reg copy HKLM\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION%.bak HKLM\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION% /s /f 1>nul 2>nul
  reg delete HKLM\Software\MiKTeX.org\MiKTeX\%MIKTEX_VERSION%.bak /f 1>nul 2>nul
)

rem copy current GSview settings to USB drive
if exist "%USERPROFILE%\gsview32.ini" (
  copy "%USERPROFILE%\gsview32.ini" "%~dp0.gsview32.ini" 1>nul 2>nul
  del "%USERPROFILE%\gsview32.ini" 1>nul 2>nul
)

rem restore backup version of gswin32.ini
if exist "%USERPROFILE%\gsview32.ini.bak" (
  ren "%USERPROFILE%\gsview32.ini.bak" gsview32.ini
)

rem delete folder and file context menu item
reg delete HKCU\Software\Classes\Folder\shell\ZCmdHere /f 1>nul 2>nul
reg delete HKCU\Software\Classes\*\shell\ZCmdHere /f 1>nul 2>nul

rem delete lock entry in the Registry
reg delete HKCU\Software\TeX-portable /f 2>nul 1>nul

cls
echo You can now disconnect the USB drive!
echo.
pause