#
#ragel
#
#Ragel State Machine Compiler
#

#A client project can import the ragel tool as follows (crosscompiling or not):
#
#find_file (IMPORT_RAGEL "tool/ragel.cmake")
#include (${IMPORT_RAGEL})
#add_custom_command (
#  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/generated.cpp
#  COMMAND tool-ragel ${CMAKE_CURRENT_SOURCE_DIR}/input.rl -o ${CMAKE_CURRENT_BINARY_DIR}/generated.cpp
#  DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/input.rl
#)
#
#The file ${CMAKE_CURRENT_BINARY_DIR}/generated.cpp can be specified as input
#to the (cross)compiler as if it was an ordinary source file.
#For further details, see 
#http://www.vtk.org/Wiki/CMake_Cross_Compiling
#http://www.cmake.org/Wiki/CMake/Tutorials/Exporting_and_Importing_Targets

if (WIN32)
ExternalProject_Add (
  ragel
  PREFIX ${CMAKE_INSTALL_PREFIX}
  URL http://www.colm.net/files/ragel/ragel-6.9.tar.gz
  URL_MD5 0c3110d7f17f7af4d9cb774443898dc1
  PATCH_COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_LIST_DIR}/patch .
  CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> -DCMAKE_BUILD_TYPE:STRING=Release
)
endif (WIN32)

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