#
#Ruby script interpreter
#

if (WIN32)

#Ruby is not expected to be present on WIN32.
#Build from sources and install where find_package(ruby) will find it.
#If the internal design of Ruby had not relied on the internals of FILE,
#the following would have worked.
#
#if (CMAKE_CL_64)
#  set (RUBY_TARGET x64-mswin64)
#else (CMAKE_CL_64)
#  set (RUBY_TARGET i386-mswin32)
#endif (CMAKE_CL_64)
#
#ExternalProject_Add (
#  ruby
#  PREFIX ${CMAKE_INSTALL_PREFIX}
#  URL https://github.com/ruby/ruby/archive/v1_9_3_551.zip
#  DOWNLOAD_NAME ruby-1.9.3.551.zip
#  URL_MD5 0ff83255ab508d5d88e2f3a1f9e4fa4b
#  PATCH_COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_LIST_DIR}/patch .
#  CONFIGURE_COMMAND $<SHELL_PATH:<SOURCE_DIR>/win32/configure.bat> 
#    --yacc=$<SHELL_PATH:${CMAKE_INSTALL_PREFIX}/bin/bison> 
#    --target=${RUBY_TARGET}
#    --prefix=<INSTALL_DIR>
#    --disable-install-doc
#  BUILD_COMMAND ${CMAKE_COMMAND} -E env BISON_SIMPLE=$<SHELL_PATH:${CMAKE_INSTALL_PREFIX}/share/bison.simple> nmake
#  INSTALL_COMMAND nmake install
#  DEPENDS bison
#)

#Ruby source code turned out ot be quite a nest.
#Install from a precompiled binary distribution instead.
ExternalProject_Add (
  ruby
  PREFIX ${CMAKE_INSTALL_PREFIX}
  URL http://dl.bintray.com/oneclick/rubyinstaller/ruby-1.9.3-p551-i386-mingw32.7z
  URL_MD5 73ba6e292d3afec5cecc68ec64fd85bf
  CONFIGURE_COMMAND ""
  BUILD_COMMAND ""
  INSTALL_COMMAND ${CMAKE_COMMAND} -E copy_directory <SOURCE_DIR> <INSTALL_DIR>
)
endif (WIN32)

if (UNIX)
#Rely on manual installation via the package manager
#You can then invoke ruby as /usr/bin/ruby
#sudo apt-get install ruby-full
ExternalProject_Add (
  ruby
  PREFIX ${CMAKE_INSTALL_PREFIX}
  BUILD_IN_SOURCE 1
  DOWNLOAD_COMMAND ""
  UPDATE_COMMAND ""
  CONFIGURE_COMMAND ""
  BUILD_COMMAND /usr/bin/ruby --version
  INSTALL_COMMAND ""
)
endif (UNIX)