# - Find Octave
# GNU Octave is a high-level interpreted language, primarily intended for numerical computations.
# available at http://www.gnu.org/software/octave/
#
# This module defines:
#  OCTAVE_EXECUTABLE           - octave interpreter
#  OCTAVE_INCLUDE_DIRS         - include path for mex.h, mexproto.h
#  OCTAVE_LIBRARIES            - required libraries: octinterp, octave, cruft
#  OCTAVE_OCTINTERP_LIBRARY    - path to the library octinterp
#  OCTAVE_OCTAVE_LIBRARY       - path to the library octave
#  OCTAVE_CRUFT_LIBRARY        - path to the library cruft
#  OCTAVE_VERSION_STRING       - octave version string
#  OCTAVE_MAJOR_VERSION        - major version
#  OCTAVE_MINOR_VERSION        - minor version
#  OCTAVE_PATCH_VERSION        - patch version
#  OCTAVE_OCT_FILE_DIR         - object files that will be dynamically loaded
#  OCTAVE_OCT_LIB_DIR          - oct libraries
#
# The macro octave_add_oct allows to create compiled modules.
# octave_add_oct ( target_name
#         [SOURCES] source1 [source2 ...]
#         [LINK_LIBRARIES  lib1 [lib2 ...]]
#         [EXTENSION ext]
# )
#

#=============================================================================
# Copyright 2013, Julien Schueller
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and documentation are those
# of the authors and should not be interpreted as representing official policies,
# either expressed or implied, of the FreeBSD Project.
#=============================================================================

find_program( OCTAVE_CONFIG_EXECUTABLE
              NAMES octave-config
            )

if ( OCTAVE_CONFIG_EXECUTABLE )

  execute_process ( COMMAND ${OCTAVE_CONFIG_EXECUTABLE} -p BINDIR
                    OUTPUT_VARIABLE OCTAVE_BIN_PATHS
                    OUTPUT_STRIP_TRAILING_WHITESPACE )

  execute_process ( COMMAND ${OCTAVE_CONFIG_EXECUTABLE} -p OCTINCLUDEDIR
                    OUTPUT_VARIABLE OCTAVE_INCLUDE_PATHS
                    OUTPUT_STRIP_TRAILING_WHITESPACE )

  execute_process ( COMMAND ${OCTAVE_CONFIG_EXECUTABLE} -p OCTLIBDIR
                    OUTPUT_VARIABLE OCTAVE_LIBRARIES_PATHS
                    OUTPUT_STRIP_TRAILING_WHITESPACE )

  execute_process ( COMMAND ${OCTAVE_CONFIG_EXECUTABLE} -p OCTFILEDIR
                    OUTPUT_VARIABLE OCTAVE_OCT_FILE_DIR
                    OUTPUT_STRIP_TRAILING_WHITESPACE )

  execute_process ( COMMAND ${OCTAVE_CONFIG_EXECUTABLE} -p OCTLIBDIR
                    OUTPUT_VARIABLE OCTAVE_OCT_LIB_DIR
                    OUTPUT_STRIP_TRAILING_WHITESPACE )

  execute_process ( COMMAND ${OCTAVE_CONFIG_EXECUTABLE} -v
                    OUTPUT_VARIABLE OCTAVE_VERSION_STRING
                    OUTPUT_STRIP_TRAILING_WHITESPACE )

  if ( OCTAVE_VERSION_STRING )
    string ( REGEX REPLACE "([0-9]+)\\..*" "\\1" OCTAVE_MAJOR_VERSION ${OCTAVE_VERSION_STRING} )
    string ( REGEX REPLACE "[0-9]+\\.([0-9]+).*" "\\1" OCTAVE_MINOR_VERSION ${OCTAVE_VERSION_STRING} )
    string ( REGEX REPLACE "[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" OCTAVE_PATCH_VERSION ${OCTAVE_VERSION_STRING} )
  endif ()
endif ()

find_program( OCTAVE_EXECUTABLE
              HINTS ${OCTAVE_BIN_PATHS}
              NAMES octave
            )

find_library( OCTAVE_OCTINTERP_LIBRARY
              NAMES octinterp liboctinterp
              HINTS ${OCTAVE_LIBRARIES_PATHS}
            )
find_library( OCTAVE_OCTAVE_LIBRARY
              NAMES octave liboctave
              HINTS ${OCTAVE_LIBRARIES_PATHS}
            )
find_library( OCTAVE_CRUFT_LIBRARY
              NAMES cruft libcruft
              HINTS ${OCTAVE_LIBRARIES_PATHS}
            )

set ( OCTAVE_LIBRARIES ${OCTAVE_OCTINTERP_LIBRARY} )
list ( APPEND OCTAVE_LIBRARIES ${OCTAVE_OCTAVE_LIBRARY} )
if ( ${OCTAVE_CRUFT_LIBRARY} ) 
  list ( APPEND OCTAVE_LIBRARIES ${OCTAVE_CRUFT_LIBRARY} )
endif ()

find_path ( OCTAVE_INCLUDE_DIR
            NAMES mex.h
            HINTS ${OCTAVE_INCLUDE_PATHS}
          )

set ( OCTAVE_INCLUDE_DIRS ${OCTAVE_INCLUDE_DIR} )

macro ( octave_add_oct FUNCTIONNAME )
  set ( _CMD SOURCES )
  set ( _SOURCES )
  set ( _LINK_LIBRARIES )
  set ( _EXTENSION )
  set ( _OCT_EXTENSION oct )
  foreach ( _ARG ${ARGN})
    if ( ${_ARG} MATCHES SOURCES )
      set ( _CMD SOURCES )
    elseif ( ${_ARG} MATCHES LINK_LIBRARIES  )
      set ( _CMD LINK_LIBRARIES  )
    elseif ( ${_ARG} MATCHES EXTENSION )
      set ( _CMD EXTENSION )
    else ()
      if ( ${_CMD} MATCHES SOURCES )
        list ( APPEND _SOURCES "${_ARG}" )
      elseif ( ${_CMD} MATCHES LINK_LIBRARIES  )
        list ( APPEND _LINK_LIBRARIES "${_ARG}" )
      elseif ( ${_CMD} MATCHES EXTENSION )
        set ( _OCT_EXTENSION ${_ARG} )
      endif ()
    endif ()
  endforeach ()
  add_library ( ${FUNCTIONNAME} SHARED ${_SOURCES} )
  target_link_libraries ( ${FUNCTIONNAME} ${OCTAVE_LIBRARIES} ${_LINK_LIBRARIES} )
  set_target_properties ( ${FUNCTIONNAME} PROPERTIES
    PREFIX ""
    SUFFIX  ".${_OCT_EXTENSION}"
  )
endmacro ()

# handle REQUIRED and QUIET options
include ( FindPackageHandleStandardArgs )
if ( CMAKE_VERSION LESS 2.8.3 )
  find_package_handle_standard_args ( Octave DEFAULT_MSG OCTAVE_EXECUTABLE OCTAVE_INCLUDE_DIRS OCTAVE_LIBRARIES OCTAVE_VERSION_STRING )
else ()
  find_package_handle_standard_args ( Octave REQUIRED_VARS OCTAVE_EXECUTABLE OCTAVE_INCLUDE_DIRS OCTAVE_LIBRARIES VERSION_VAR OCTAVE_VERSION_STRING )
endif ()

mark_as_advanced (
  OCTAVE_OCT_FILE_DIR
  OCTAVE_OCT_LIB_DIR
  OCTAVE_OCTINTERP_LIBRARY
  OCTAVE_OCTAVE_LIBRARY
  OCTAVE_CRUFT_LIBRARY
  OCTAVE_LIBRARIES
  OCTAVE_INCLUDE_DIR
  OCTAVE_INCLUDE_DIRS
  OCTAVE_VERSION_STRING
  OCTAVE_MAJOR_VERSION
  OCTAVE_MINOR_VERSION
  OCTAVE_PATCH_VERSION
)
