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# Copyright (c) 2014 Google, Inc.    All rights reserved.
# **********************************************************

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###########################################################################
# Lookup visual studio registry hives and figure out the newest installed
# visual studio version. It returns the installation path, the version number
# and the appropriate generator string.
#
function(get_visualstudio_info vs_dir_out vs_version_out vs_generator_out)
  get_filename_component(${vs_dir_out} [HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\VisualStudio\\12.0_Config\\Setup\\VS;ProductDir] REALPATH)
  # on failure we get "c:/registry"
  # XXX: this won't work if user happens to install visual studio in a path
  # ending in "/registry".
  if ("${vs_dir_out}" MATCHES "/registry$")
    set(${vs_version_out} "NOTFOUND" PARENT_SCOPE)
  else ()
    set(${vs_version_out} "12.0" PARENT_SCOPE)
    set(${vs_generator_out} "Visual Studio 12" PARENT_SCOPE)
    return()
  endif()
  get_filename_component(${vs_dir_out} [HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\VisualStudio\\11.0_Config\\Setup\\VS;ProductDir] REALPATH)
  if ("${vs_dir_out}" MATCHES "/registry$")
    # on failure we get "/registry"
    set(${vs_version_out} "NOTFOUND" PARENT_SCOPE)
  else ()
    set(${vs_version_out} "11.0" PARENT_SCOPE)
    set(${vs_generator_out} "Visual Studio 11" PARENT_SCOPE)
    return()
  endif()
  get_filename_component(${vs_dir_out} [HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\VisualStudio\\10.0_Config\\Setup\\VS;ProductDir] REALPATH)
  if ("${vs_dir_out}" MATCHES "/registry$")
    # on failure we get "/registry"
    set(${vs_version_out} "NOTFOUND" PARENT_SCOPE)
  else ()
    set(${vs_version_out} "10.0" PARENT_SCOPE)
    set(${vs_generator_out} "Visual Studio 10" PARENT_SCOPE)
    return()
  endif()
  # Visual Studio prior to 2010, stores the regkey "ProductDir" in a different
  # registry path.
  get_filename_component(${vs_dir_out} [HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\VisualStudio\\9.0\\Setup\\VS;ProductDir] REALPATH)
  if ("${vs_dir_out}" MATCHES "/registry$")
    # on failure we get "/registry"
    set(${vs_version_out} "NOTFOUND" PARENT_SCOPE)
  else ()
    set(${vs_version_out} "9.0" PARENT_SCOPE)
    set(${vs_generator_out} "Visual Studio 9 2008" PARENT_SCOPE)
    return()
  endif()
  get_filename_component(${vs_dir_out} [HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\VisualStudio\\8.0\\Setup\\VS;ProductDir] REALPATH)
  if ("${vs_dir_out}" MATCHES "/registry$")
    # on failure we get "/registry"
    set(${vs_version_out} "NOTFOUND" PARENT_SCOPE)
  else ()
    set(${vs_version_out} "8.0" PARENT_SCOPE)
    set(${vs_generator_out} "Visual Studio 8 2005" PARENT_SCOPE)
    return()
  endif()
endfunction(get_visualstudio_info)
