# - try to find perl modules, passed as COMPONENTS
#
# Non-cache variable you might use in your CMakeLists.txt:
#  PERLMODULES_FOUND
#
# Requires these CMake modules:
#  FindPackageHandleStandardArgs (known included with CMake >=2.6.2)
#
# Original Author:
# 2012 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
# http://academic.cleardefinition.com
# Iowa State University HCI Graduate Program/VRAC
#
# Copyright Iowa State University 2012.
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)

if(NOT PERL_FOUND)
  find_package(Perl QUIET)
endif()

set(_deps_check)
if(PERL_FOUND)
  foreach(module ${PerlModules_FIND_COMPONENTS})
    string(REPLACE "::" "/" modfilename "${module}.pm")
    string(REPLACE "::" "_" modvarname "PERLMODULES_${module}_MODULE")
    string(TOUPPER "${modvarname}" modvarname)
    list(APPEND _deps_check ${modvarname})
    if(NOT ${modvarname})
      if(NOT PerlModules_FIND_QUIETLY)
        message(STATUS "Checking for perl module ${module}")
      endif()
      execute_process(COMMAND
        "${PERL_EXECUTABLE}"
        "-e"
        "use ${module}; print \$INC{\"${modfilename}\"}"
        RESULT_VARIABLE result_code
        OUTPUT_VARIABLE filename
        ERROR_VARIABLE error_info
        OUTPUT_STRIP_TRAILING_WHITESPACE)
      if(result_code EQUAL 0)
        if(NOT PerlModules_FIND_QUIETLY)
          message(STATUS
            "Checking for perl module ${module} - found at ${filename}")
        endif()
        set(${modvarname}
          "${filename}"
          CACHE
          FILEPATH
          "Location found for module ${module}"
          FORCE)
        mark_as_advanced(${modvarname})
      else()
        if(NOT PerlModules_FIND_QUIETLY)
          message(STATUS "Checking for perl module ${module} - failed")
        endif()
        set(${modvarname}
          "NOTFOUND"
          CACHE
          FILEPATH
          "No location found for module ${module}"
          FORCE)
        file(APPEND
          ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
          "Determining if the Perl module ${module} exists failed with the following error output:\n"
          "${error_info}\n\n")
      endif()
    endif()
  endforeach()
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(PerlModules
  DEFAULT_MSG
  PERL_FOUND
  ${_deps_check})