# Copyright (c) 2003-2010 by FlashCode <flashcode@flashtux.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# - Find Ruby
# This module finds if Ruby is installed and determines where the include files
# and libraries are. It also determines what the name of the library is. This
# code sets the following variables:
#
#  RUBY_EXECUTABLE   = full path to the ruby binary
#  RUBY_INCLUDE_PATH = path to where ruby.h can be found
#  RUBY_LIBRARY = path to where libruby.so* can be found

IF(RUBY_FOUND)
   # Already in cache, be silent
   SET(RUBY_FIND_QUIETLY TRUE)
ENDIF(RUBY_FOUND)

FIND_PROGRAM(RUBY_EXECUTABLE 
  NAMES ruby ruby1.9 ruby19 ruby1.8 ruby18 ruby1.6 ruby16
  PATHS /usr/bin /usr/local/bin /usr/pkg/bin
  )

IF(RUBY_EXECUTABLE)
  EXECUTE_PROCESS(
    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "puts Config::CONFIG['rubyhdrdir'] || Config::CONFIG['archdir']"
    OUTPUT_VARIABLE RUBY_ARCH_DIR
    )

  EXECUTE_PROCESS(
    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "puts Config::CONFIG['arch']"
    OUTPUT_VARIABLE RUBY_ARCH
    )

  EXECUTE_PROCESS(
    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "puts Config::CONFIG['libdir']"
    OUTPUT_VARIABLE RUBY_POSSIBLE_LIB_PATH
    )
  
  EXECUTE_PROCESS(
    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "puts Config::CONFIG['rubylibdir']"
    OUTPUT_VARIABLE RUBY_RUBY_LIB_PATH
    )

  EXECUTE_PROCESS(
    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "puts Config::CONFIG['ruby_version']"
    OUTPUT_VARIABLE RUBY_VERSION
    )
  
  # remove the new lines from the output by replacing them with empty strings
  STRING(REPLACE "\n" "" RUBY_ARCH_DIR "${RUBY_ARCH_DIR}")
  STRING(REPLACE "\n" "" RUBY_POSSIBLE_LIB_PATH "${RUBY_POSSIBLE_LIB_PATH}")
  STRING(REPLACE "\n" "" RUBY_RUBY_LIB_PATH "${RUBY_RUBY_LIB_PATH}")
  STRING(REPLACE "\n" "" RUBY_ARCH "${RUBY_ARCH}")
  STRING(REPLACE "\n" "" RUBY_VERSION "${RUBY_VERSION}")
  
  FIND_PATH(RUBY_INCLUDE_PATH
    NAMES ruby.h
    PATHS ${RUBY_ARCH_DIR}
    )

  SET(RUBY_ARCH
    "${RUBY_INCLUDE_PATH}/${RUBY_ARCH}")

  FIND_LIBRARY(RUBY_LIBRARY
    NAMES ruby ruby1.6 ruby16 ruby1.8 ruby18 ruby1.9 ruby19
    PATHS ${RUBY_POSSIBLE_LIB_PATH} ${RUBY_RUBY_LIB_PATH}
    )

  IF(RUBY_LIBRARY AND RUBY_INCLUDE_PATH)
    SET(RUBY_FOUND TRUE)
  ENDIF(RUBY_LIBRARY AND RUBY_INCLUDE_PATH)
  
  IF(${RUBY_VERSION} STREQUAL "1.9.0")
    SET(RUBY_FOUND FALSE)
  ENDIF(${RUBY_VERSION} STREQUAL "1.9.0")
  
  MARK_AS_ADVANCED(
    RUBY_EXECUTABLE
    RUBY_LIBRARY
    RUBY_ARCH
    RUBY_INCLUDE_PATH
    )
ENDIF(RUBY_EXECUTABLE)