Modules/FeatureSummary.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
FeatureSummary
--------------

Functions for generating a summary of enabled/disabled features.

These functions can be used to generate a summary of enabled and disabled
packages and/or feature for a build tree such as::

    -- The following OPTIONAL packages have been found:
    LibXml2 (required version >= 2.4), XML processing lib, <http://xmlsoft.org>
       * Enables HTML-import in MyWordProcessor
       * Enables odt-export in MyWordProcessor
    PNG, A PNG image library., <http://www.libpng.org/pub/png/>
       * Enables saving screenshots
    -- The following OPTIONAL packages have not been found:
    Lua51, The Lua scripting language., <http://www.lua.org>
       * Enables macros in MyWordProcessor
    Foo, Foo provides cool stuff.

Global Properties
^^^^^^^^^^^^^^^^^

.. variable:: FeatureSummary_PKG_TYPES

The global property :variable:`FeatureSummary_PKG_TYPES` defines the type of
packages used by `FeatureSummary`.

The order in this list is important, the first package type in the list is the
least important, the last is the most important. the of a package can only be
changed to higher types.

The default package types are , ``RUNTIME``, ``OPTIONAL``, ``RECOMMENDED`` and
``REQUIRED``, and their importance is
``RUNTIME < OPTIONAL < RECOMMENDED < REQUIRED``.


.. variable:: FeatureSummary_REQUIRED_PKG_TYPES

The global property :variable:`FeatureSummary_REQUIRED_PKG_TYPES` defines which
package types are required.

If one or more package in this categories has not been found, CMake will abort
when calling :command:`feature_summary` with the
'FATAL_ON_MISSING_REQUIRED_PACKAGES' option enabled.

The default value for this global property is ``REQUIRED``.


.. variable:: FeatureSummary_DEFAULT_PKG_TYPE

The global property :variable:`FeatureSummary_DEFAULT_PKG_TYPE` defines which
package type is the default one.
When calling :command:`feature_summary`, if the user did not set the package type
explicitly, the package will be assigned to this category.

This value must be one of the types defined in the
:variable:`FeatureSummary_PKG_TYPES` global property unless the package type
is set for all the packages.

The default value for this global property is ``OPTIONAL``.

#]=======================================================================]

get_property(_fsPkgTypeIsSet GLOBAL PROPERTY FeatureSummary_PKG_TYPES SET)
if(NOT _fsPkgTypeIsSet)
  set_property(GLOBAL PROPERTY FeatureSummary_PKG_TYPES RUNTIME OPTIONAL RECOMMENDED REQUIRED)
endif()

get_property(_fsReqPkgTypesIsSet GLOBAL PROPERTY FeatureSummary_REQUIRED_PKG_TYPES SET)
if(NOT _fsReqPkgTypesIsSet)
  set_property(GLOBAL PROPERTY FeatureSummary_REQUIRED_PKG_TYPES REQUIRED)
endif()

get_property(_fsDefaultPkgTypeIsSet GLOBAL PROPERTY FeatureSummary_DEFAULT_PKG_TYPE SET)
if(NOT _fsDefaultPkgTypeIsSet)
  set_property(GLOBAL PROPERTY FeatureSummary_DEFAULT_PKG_TYPE OPTIONAL)
endif()

#[=======================================================================[.rst:

Functions
^^^^^^^^^

#]=======================================================================]

include(CMakeParseArguments)

function(_FS_GET_FEATURE_SUMMARY _property _var _includeQuiet)

  get_property(_fsPkgTypes GLOBAL PROPERTY FeatureSummary_PKG_TYPES)
  get_property(_fsDefaultPkgType GLOBAL PROPERTY FeatureSummary_DEFAULT_PKG_TYPE)

  set(_type "ANY")
  foreach(_fsPkgType ${_fsPkgTypes})
    if("${_property}" MATCHES "${_fsPkgType}_PACKAGES_(NOT_)?FOUND")
      set(_type "${_fsPkgType}")
      break()
    endif()
  endforeach()

  if("${_property}" MATCHES "PACKAGES_FOUND")
    set(_property "PACKAGES_FOUND")
  elseif("${_property}" MATCHES "PACKAGES_NOT_FOUND")
    set(_property "PACKAGES_NOT_FOUND")
  endif()


  set(_currentFeatureText "")
  get_property(_EnabledFeatures  GLOBAL PROPERTY ${_property})
  if(_EnabledFeatures)
    list(REMOVE_DUPLICATES _EnabledFeatures)
  endif(_EnabledFeatures)

  foreach(_currentFeature ${_EnabledFeatures})

    # does this package belong to the type we currently want to list ?
    get_property(_currentType  GLOBAL PROPERTY _CMAKE_${_currentFeature}_TYPE)
    if(NOT _currentType)
      list(FIND _fsPkgTypes "${_fsDefaultPkgType}" _defaultInPkgTypes)
      if("${_defaultInPkgTypes}" STREQUAL "-1")
        string(REGEX REPLACE ";([^;]+)$" " and \\1" _fsPkgTypes_msg "${_fsPkgTypes}")
        string(REPLACE ";" ", " _fsPkgTypes_msg "${_fsPkgTypes_msg}")
        message(FATAL_ERROR "Bad package property type ${_fsDefaultPkgType} used in global property FeatureSummary_DEFAULT_PKG_TYPE. "
                            "Valid types are ${_fsPkgTypes_msg}. "
                            "Either update FeatureSummary_DEFAULT_PKG_TYPE or add ${_fsDefaultPkgType} to the FeatureSummary_PKG_TYPES global property.")
      endif()
      set(_currentType ${_fsDefaultPkgType})
    endif()

    if("${_type}" STREQUAL ANY  OR  "${_type}" STREQUAL "${_currentType}")
      # check whether the current feature/package should be in the output depending on whether it was QUIET or not
      set(includeThisOne TRUE)
      set(_required FALSE)
      # skip QUIET packages, except if they are REQUIRED or INCLUDE_QUIET_PACKAGES has been set
      get_property(_fsReqPkgTypes GLOBAL PROPERTY FeatureSummary_REQUIRED_PKG_TYPES)
      foreach(_fsReqPkgType ${_fsReqPkgTypes})
        if("${_currentType}" STREQUAL "${_fsReqPkgType}")
          set(_required TRUE)
          break()
        endif()
      endforeach()
      if(NOT _required AND NOT _includeQuiet)
        get_property(_isQuiet  GLOBAL PROPERTY _CMAKE_${_currentFeature}_QUIET)
        if(_isQuiet)
          set(includeThisOne FALSE)
        endif()
      endif()
      get_property(_isTransitiveDepend
        GLOBAL PROPERTY _CMAKE_${_currentFeature}_TRANSITIVE_DEPENDENCY
      )
      if(_isTransitiveDepend)
        set(includeThisOne FALSE)
      endif()

      if(includeThisOne)

        string(APPEND _currentFeatureText "\n * ${_currentFeature}")
        get_property(_info  GLOBAL PROPERTY _CMAKE_${_currentFeature}_REQUIRED_VERSION)
        if(_info)
          string(APPEND _currentFeatureText " (required version ${_info})")
        endif()
        get_property(_info  GLOBAL PROPERTY _CMAKE_${_currentFeature}_DESCRIPTION)
        if(_info)
          string(APPEND _currentFeatureText ", ${_info}")
        endif()
        get_property(_info  GLOBAL PROPERTY _CMAKE_${_currentFeature}_URL)
        if(_info)
          string(APPEND _currentFeatureText ", <${_info}>")
        endif()

        get_property(_info  GLOBAL PROPERTY _CMAKE_${_currentFeature}_PURPOSE)
        foreach(_purpose ${_info})
          string(APPEND _currentFeatureText "\n   ${_purpose}")
        endforeach()

      endif()

    endif()

  endforeach()
  set(${_var} "${_currentFeatureText}" PARENT_SCOPE)
endfunction()


#[=======================================================================[.rst:
.. command:: feature_summary

  ::

    feature_summary( [FILENAME <file>]
                     [APPEND]
                     [VAR <variable_name>]
                     [INCLUDE_QUIET_PACKAGES]
                     [FATAL_ON_MISSING_REQUIRED_PACKAGES]
                     [DESCRIPTION "<description>"]
                     [QUIET_ON_EMPTY]
                     WHAT (ALL
                          | PACKAGES_FOUND | PACKAGES_NOT_FOUND
                          | <TYPE>_PACKAGES_FOUND | <TYPE>_PACKAGES_NOT_FOUND
                          | ENABLED_FEATURES | DISABLED_FEATURES)
                   )

  The ``feature_summary()`` macro can be used to print information about
  enabled or disabled packages or features of a project.  By default,
  only the names of the features/packages will be printed and their
  required version when one was specified.  Use ``set_package_properties()``
  to add more useful information, like e.g.  a download URL for the
  respective package or their purpose in the project.

  The ``WHAT`` option is the only mandatory option.  Here you specify what
  information will be printed:

  ``ALL``
   print everything
  ``ENABLED_FEATURES``
   the list of all features which are enabled
  ``DISABLED_FEATURES``
   the list of all features which are disabled
  ``PACKAGES_FOUND``
   the list of all packages which have been found
  ``PACKAGES_NOT_FOUND``
   the list of all packages which have not been found

  For each package type ``<TYPE>`` defined by the
  :variable:`FeatureSummary_PKG_TYPES` global property, the following
  information can also be used:

  ``<TYPE>_PACKAGES_FOUND``
   only those packages which have been found which have the type <TYPE>
  ``<TYPE>_PACKAGES_NOT_FOUND``
   only those packages which have not been found which have the type <TYPE>

  With the exception of the ``ALL`` value, these values can be combined
  in order to customize the output. For example:

  .. code-block:: cmake

    feature_summary(WHAT ENABLED_FEATURES DISABLED_FEATURES)

  If a ``FILENAME`` is given, the information is printed into this file.  If
  ``APPEND`` is used, it is appended to this file, otherwise the file is
  overwritten if it already existed.  If the VAR option is used, the
  information is "printed" into the specified variable.  If ``FILENAME`` is
  not used, the information is printed to the terminal.  Using the
  ``DESCRIPTION`` option a description or headline can be set which will be
  printed above the actual content.
  If ``INCLUDE_QUIET_PACKAGES`` is given, packages which have been searched with
  ``find_package(... QUIET)`` will also be listed. By default they are skipped.
  If ``FATAL_ON_MISSING_REQUIRED_PACKAGES`` is given, CMake will abort if a
  package which is marked as one of the package types listed in the
  :variable:`FeatureSummary_REQUIRED_PKG_TYPES` global property has not been
  found.
  The default value for the :variable:`FeatureSummary_REQUIRED_PKG_TYPES` global
  property is ``REQUIRED``.

  The :variable:`FeatureSummary_DEFAULT_PKG_TYPE` global property can be
  modified to change the default package type assigned when not explicitly
  assigned by the user.

  If the ``QUIET_ON_EMPTY`` option is used, if only one type of package was
  requested, and no packages belonging to that category were found, then no
  output (including the ``DESCRIPTION``) is printed or added to the ``VAR``
  variable.

  Example 1, append everything to a file:

  .. code-block:: cmake

   include(FeatureSummary)
   feature_summary(WHAT ALL
                   FILENAME ${CMAKE_BINARY_DIR}/all.log APPEND)

  Example 2, print the enabled features into the variable
  enabledFeaturesText, including QUIET packages:

  .. code-block:: cmake

   include(FeatureSummary)
   feature_summary(WHAT ENABLED_FEATURES
                   INCLUDE_QUIET_PACKAGES
                   DESCRIPTION "Enabled Features:"
                   VAR enabledFeaturesText)
   message(STATUS "${enabledFeaturesText}")

  Example 3, change default package types and print only the categories that
  are not empty:

  .. code-block:: cmake

   include(FeatureSummary)
   set_property(GLOBAL APPEND PROPERTY FeatureSummary_PKG_TYPES BUILD)
   find_package(FOO)
   set_package_properties(FOO PROPERTIES TYPE BUILD)
   feature_summary(WHAT BUILD_PACKAGES_FOUND
                   Description "Build tools found:"
                   QUIET_ON_EMPTY)
   feature_summary(WHAT BUILD_PACKAGES_NOT_FOUND
                   Description "Build tools not found:"
                   QUIET_ON_EMPTY)

#]=======================================================================]

function(FEATURE_SUMMARY)
# CMAKE_PARSE_ARGUMENTS(<prefix> <options> <one_value_keywords> <multi_value_keywords> args...)
  set(options APPEND INCLUDE_QUIET_PACKAGES FATAL_ON_MISSING_REQUIRED_PACKAGES QUIET_ON_EMPTY)
  set(oneValueArgs FILENAME VAR DESCRIPTION)
  set(multiValueArgs WHAT)

  CMAKE_PARSE_ARGUMENTS(_FS "${options}" "${oneValueArgs}" "${multiValueArgs}"  ${_FIRST_ARG} ${ARGN})

  if(_FS_UNPARSED_ARGUMENTS)
    message(FATAL_ERROR "Unknown keywords given to FEATURE_SUMMARY(): \"${_FS_UNPARSED_ARGUMENTS}\"")
  endif()

  if(NOT _FS_WHAT)
    message(FATAL_ERROR "The call to FEATURE_SUMMARY() doesn't set the required WHAT argument.")
  endif()

  set(validWhatParts "ENABLED_FEATURES"
                     "DISABLED_FEATURES"
                     "PACKAGES_FOUND"
                     "PACKAGES_NOT_FOUND")

  get_property(_fsPkgTypes GLOBAL PROPERTY FeatureSummary_PKG_TYPES)
  get_property(_fsReqPkgTypes GLOBAL PROPERTY FeatureSummary_REQUIRED_PKG_TYPES)
  foreach(_fsPkgType ${_fsPkgTypes})
    list(APPEND validWhatParts "${_fsPkgType}_PACKAGES_FOUND"
                               "${_fsPkgType}_PACKAGES_NOT_FOUND")
  endforeach()

  list(FIND validWhatParts "${_FS_WHAT}" indexInList)
  if(NOT "${indexInList}" STREQUAL "-1")
    _FS_GET_FEATURE_SUMMARY( ${_FS_WHAT} _featureSummary ${_FS_INCLUDE_QUIET_PACKAGES} )
    if(_featureSummary OR NOT _FS_QUIET_ON_EMPTY)
      set(_fullText "${_FS_DESCRIPTION}${_featureSummary}\n")
    endif()

    if(_featureSummary)
      foreach(_fsReqPkgType ${_fsReqPkgTypes})
        if("${_FS_WHAT}" STREQUAL "${_fsReqPkgType}_PACKAGES_NOT_FOUND")
          set(requiredPackagesNotFound TRUE)
          break()
        endif()
      endforeach()
    endif()

  else()
    if("${_FS_WHAT}" STREQUAL "ALL")

      set(allWhatParts "ENABLED_FEATURES")
      foreach(_fsPkgType ${_fsPkgTypes})
        list(APPEND allWhatParts "${_fsPkgType}_PACKAGES_FOUND")
      endforeach()
      list(APPEND allWhatParts "DISABLED_FEATURES")
      foreach(_fsPkgType ${_fsPkgTypes})
        list(APPEND allWhatParts "${_fsPkgType}_PACKAGES_NOT_FOUND")
      endforeach()
    else()
      set(allWhatParts)
      foreach(part ${_FS_WHAT})
        list(FIND validWhatParts "${part}" indexInList)
        if(NOT "${indexInList}" STREQUAL "-1")
          list(APPEND allWhatParts "${part}")
        else()
          if("${part}" STREQUAL "ALL")
            message(FATAL_ERROR "The WHAT argument of FEATURE_SUMMARY() contains ALL, which cannot be combined with other values.")
          else()
            message(FATAL_ERROR "The WHAT argument of FEATURE_SUMMARY() contains ${part}, which is not a valid value.")
          endif()
        endif()
      endforeach()
    endif()

    set(title_ENABLED_FEATURES               "The following features have been enabled:")
    set(title_DISABLED_FEATURES              "The following features have been disabled:")
    set(title_PACKAGES_FOUND                 "The following packages have been found:")
    set(title_PACKAGES_NOT_FOUND             "The following packages have not been found:")
    foreach(_fsPkgType ${_fsPkgTypes})
      set(title_${_fsPkgType}_PACKAGES_FOUND     "The following ${_fsPkgType} packages have been found:")
      set(title_${_fsPkgType}_PACKAGES_NOT_FOUND "The following ${_fsPkgType} packages have not been found:")
    endforeach()

    set(_fullText "${_FS_DESCRIPTION}")
    foreach(part ${allWhatParts})
      set(_tmp)
      _FS_GET_FEATURE_SUMMARY( ${part} _tmp ${_FS_INCLUDE_QUIET_PACKAGES})
      if(_tmp)
        if(_fullText)
          string(APPEND _fullText "\n-- ")
        endif()
        string(APPEND _fullText "${title_${part}}\n${_tmp}\n")
        foreach(_fsReqPkgType ${_fsReqPkgTypes})
          if("${part}" STREQUAL "${_fsReqPkgType}_PACKAGES_NOT_FOUND")
            set(requiredPackagesNotFound TRUE)
            break()
          endif()
        endforeach()
      endif()
    endforeach()
  endif()

  if(_fullText OR NOT _FS_QUIET_ON_EMPTY)
    if(_FS_FILENAME)
      if(_FS_APPEND)
        file(APPEND "${_FS_FILENAME}" "${_fullText}")
      else()
        file(WRITE  "${_FS_FILENAME}" "${_fullText}")
      endif()

    else()
      if(NOT _FS_VAR)
        message(STATUS "${_fullText}")
      endif()
    endif()

    if(_FS_VAR)
      set(${_FS_VAR} "${_fullText}" PARENT_SCOPE)
    endif()
  endif()

  if(requiredPackagesNotFound  AND  _FS_FATAL_ON_MISSING_REQUIRED_PACKAGES)
    message(FATAL_ERROR "feature_summary() Error: REQUIRED package(s) are missing, aborting CMake run.")
  endif()

endfunction()

#[=======================================================================[.rst:
.. command:: set_package_properties

  ::

    set_package_properties(<name> PROPERTIES
                           [ URL <url> ]
                           [ DESCRIPTION <description> ]
                           [ TYPE (RUNTIME|OPTIONAL|RECOMMENDED|REQUIRED) ]
                           [ PURPOSE <purpose> ]
                          )

  Use this macro to set up information about the named package, which
  can then be displayed via FEATURE_SUMMARY().  This can be done either
  directly in the Find-module or in the project which uses the module
  after the find_package() call.  The features for which information can
  be set are added automatically by the find_package() command.

  ``URL <url>``
    This should be the homepage of the package, or something similar.
    Ideally this is set already directly in the Find-module.

  ``DESCRIPTION <description>``
    A short description what that package is, at most one sentence.
    Ideally this is set already directly in the Find-module.

  ``TYPE <type>``
    What type of dependency has the using project on that package.
    Default is ``OPTIONAL``.  In this case it is a package which can be used
    by the project when available at buildtime, but it also work without.
    ``RECOMMENDED`` is similar to ``OPTIONAL``, i.e.  the project will build if
    the package is not present, but the functionality of the resulting
    binaries will be severly limited.  If a ``REQUIRED`` package is not
    available at buildtime, the project may not even build.  This can be
    combined with the ``FATAL_ON_MISSING_REQUIRED_PACKAGES`` argument for
    ``feature_summary()``.  Last, a ``RUNTIME`` package is a package which is
    actually not used at all during the build, but which is required for
    actually running the resulting binaries.  So if such a package is
    missing, the project can still be built, but it may not work later on.
    If ``set_package_properties()`` is called multiple times for the same
    package with different TYPEs, the ``TYPE`` is only changed to higher
    TYPEs (``RUNTIME < OPTIONAL < RECOMMENDED < REQUIRED``), lower TYPEs are
    ignored.  The ``TYPE`` property is project-specific, so it cannot be set
    by the Find-module, but must be set in the project.
    Type accepted can be changed by setting the
    :variable:`FeatureSummary_PKG_TYPES` global property.

  ``PURPOSE <purpose>``
    This describes which features this package enables in the
    project, i.e.  it tells the user what functionality he gets in the
    resulting binaries.  If set_package_properties() is called multiple
    times for a package, all PURPOSE properties are appended to a list of
    purposes of the package in the project.  As the TYPE property, also
    the PURPOSE property is project-specific, so it cannot be set by the
    Find-module, but must be set in the project.

  Example for setting the info for a package:

  .. code-block:: cmake

    find_package(LibXml2)
    set_package_properties(LibXml2 PROPERTIES
                           DESCRIPTION "A XML processing library."
                           URL "http://xmlsoft.org/")
    # or
    set_package_properties(LibXml2 PROPERTIES
                           TYPE RECOMMENDED
                           PURPOSE "Enables HTML-import in MyWordProcessor")
    # or
    set_package_properties(LibXml2 PROPERTIES
                           TYPE OPTIONAL
                           PURPOSE "Enables odt-export in MyWordProcessor")

    find_package(DBUS)
    set_package_properties(DBUS PROPERTIES
      TYPE RUNTIME
      PURPOSE "Necessary to disable the screensaver during a presentation")
#]=======================================================================]
function(SET_PACKAGE_PROPERTIES _name _props)
  if(NOT "${_props}" STREQUAL "PROPERTIES")
    message(FATAL_ERROR "PROPERTIES keyword is missing in SET_PACKAGE_PROPERTIES() call.")
  endif()

  set(options ) # none
  set(oneValueArgs DESCRIPTION URL TYPE PURPOSE )
  set(multiValueArgs ) # none

  CMAKE_PARSE_ARGUMENTS(_SPP "${options}" "${oneValueArgs}" "${multiValueArgs}"  ${ARGN})

  if(_SPP_UNPARSED_ARGUMENTS)
    message(FATAL_ERROR "Unknown keywords given to SET_PACKAGE_PROPERTIES(): \"${_SPP_UNPARSED_ARGUMENTS}\"")
  endif()

  if(_SPP_DESCRIPTION)
    get_property(_info  GLOBAL PROPERTY _CMAKE_${_name}_DESCRIPTION)
    if(_info AND NOT "${_info}" STREQUAL "${_SPP_DESCRIPTION}")
      message(STATUS "Warning: Property DESCRIPTION for package ${_name} already set to \"${_info}\", overriding it with \"${_SPP_DESCRIPTION}\"")
    endif()

    set_property(GLOBAL PROPERTY _CMAKE_${_name}_DESCRIPTION "${_SPP_DESCRIPTION}" )
  endif()


  if(_SPP_URL)
    get_property(_info  GLOBAL PROPERTY _CMAKE_${_name}_URL)
    if(_info AND NOT "${_info}" STREQUAL "${_SPP_URL}")
      message(STATUS "Warning: Property URL already set to \"${_info}\", overriding it with \"${_SPP_URL}\"")
    endif()

    set_property(GLOBAL PROPERTY _CMAKE_${_name}_URL "${_SPP_URL}" )
  endif()


  # handle the PURPOSE: use APPEND, since there can be multiple purposes for one package inside a project
  if(_SPP_PURPOSE)
    set_property(GLOBAL APPEND PROPERTY _CMAKE_${_name}_PURPOSE "${_SPP_PURPOSE}" )
  endif()

  get_property(_fsPkgTypes GLOBAL PROPERTY FeatureSummary_PKG_TYPES)
  get_property(_fsDefaultPkgType GLOBAL PROPERTY FeatureSummary_DEFAULT_PKG_TYPE)

  # handle the TYPE
  if(DEFINED _SPP_TYPE)
    # Supported types are listed in FeatureSummary_PKG_TYPES according to their priority
    get_property(_fsPkgTypes GLOBAL PROPERTY FeatureSummary_PKG_TYPES)
    list(FIND _fsPkgTypes ${_SPP_TYPE} _typeIndexInList)
    if("${_typeIndexInList}" STREQUAL "-1" )
      string(REGEX REPLACE ";([^;]+)$" " and \\1" _fsPkgTypes_msg "${_fsPkgTypes}")
      string(REPLACE ";" ", " _fsPkgTypes_msg "${_fsPkgTypes_msg}")
      message(FATAL_ERROR "Bad package property type ${_SPP_TYPE} used in SET_PACKAGE_PROPERTIES(). "
                          "Valid types are ${_fsPkgTypes_msg}." )
    endif()

    get_property(_previousType  GLOBAL PROPERTY _CMAKE_${_name}_TYPE)
    list(FIND _fsPkgTypes "${_previousType}" _prevTypeIndexInList)

    # make sure a previously set TYPE is not overridden with a lower new TYPE:
    if("${_typeIndexInList}" GREATER "${_prevTypeIndexInList}")
      set_property(GLOBAL PROPERTY _CMAKE_${_name}_TYPE "${_SPP_TYPE}" )
    endif()
  endif()

endfunction()

#[=======================================================================[.rst:
.. command:: add_feature_info

  ::

    add_feature_info(<name> <enabled> <description>)

  Use this macro to add information about a feature with the given ``<name>``.
  ``<enabled>`` contains whether this feature is enabled or not. It can be a
  variable or a list of conditions.
  ``<description>`` is a text describing the feature.  The information can
  be displayed using ``feature_summary()`` for ``ENABLED_FEATURES`` and
  ``DISABLED_FEATURES`` respectively.

  Example for setting the info for a feature:

  .. code-block:: cmake

     option(WITH_FOO "Help for foo" ON)
     add_feature_info(Foo WITH_FOO "The Foo feature provides very cool stuff.")
#]=======================================================================]
function(ADD_FEATURE_INFO _name _depends _desc)
  set(_enabled 1)
  foreach(_d ${_depends})
    string(REGEX REPLACE " +" ";" _d "${_d}")
    if(${_d})
    else()
      set(_enabled 0)
      break()
    endif()
  endforeach()
  if (${_enabled})
    set_property(GLOBAL APPEND PROPERTY ENABLED_FEATURES "${_name}")
  else ()
    set_property(GLOBAL APPEND PROPERTY DISABLED_FEATURES "${_name}")
  endif ()

  set_property(GLOBAL PROPERTY _CMAKE_${_name}_DESCRIPTION "${_desc}" )
endfunction()


# The stuff below is only kept for compatibility

#[=======================================================================[.rst:
Legacy Macros
^^^^^^^^^^^^^

The following macros are provided for compatibility with previous
CMake versions:

.. command:: set_package_info

  ::

    set_package_info(<name> <description> [ <url> [<purpose>] ])

  Use this macro to set up information about the named package, which
  can then be displayed via ``feature_summary()``.  This can be done either
  directly in the Find-module or in the project which uses the module
  after the :command:`find_package` call.  The features for which information
  can be set are added automatically by the ``find_package()`` command.
#]=======================================================================]
function(SET_PACKAGE_INFO _name _desc)
  message(DEPRECATION "SET_PACKAGE_INFO is deprecated. Use SET_PACKAGE_PROPERTIES instead.")
  unset(_url)
  unset(_purpose)
  if(ARGC GREATER 2)
    set(_url "${ARGV2}")
  endif()
  if(ARGC GREATER 3)
    set(_purpose "${ARGV3}")
  endif()
  set_property(GLOBAL PROPERTY _CMAKE_${_name}_DESCRIPTION "${_desc}" )
  if(NOT _url STREQUAL "")
    set_property(GLOBAL PROPERTY _CMAKE_${_name}_URL "${_url}" )
  endif()
  if(NOT _purpose STREQUAL "")
    set_property(GLOBAL APPEND PROPERTY _CMAKE_${_name}_PURPOSE "${_purpose}" )
  endif()
endfunction()

#[=======================================================================[.rst:
.. command:: set_feature_info

  ::

    set_feature_info(<name> <description> [<url>])

  Does the same as::

    set_package_info(<name> <description> <url>)
#]=======================================================================]
function(SET_FEATURE_INFO)
  message(DEPRECATION "SET_FEATURE_INFO is deprecated. Use ADD_FEATURE_INFO instead.")
  SET_PACKAGE_INFO(${ARGN})
endfunction()

#[=======================================================================[.rst:
.. command:: print_enabled_features

  ::

    print_enabled_features()

  Does the same as

  .. code-block:: cmake

    feature_summary(WHAT ENABLED_FEATURES DESCRIPTION "Enabled features:")
#]=======================================================================]
function(PRINT_ENABLED_FEATURES)
  message(DEPRECATION "PRINT_ENABLED_FEATURES is deprecated. Use
    feature_summary(WHAT ENABLED_FEATURES DESCRIPTION \"Enabled features:\")")
  FEATURE_SUMMARY(WHAT ENABLED_FEATURES  DESCRIPTION "Enabled features:")
endfunction()

#[=======================================================================[.rst:
.. command:: print_disabled_features

  ::

    print_disabled_features()

  Does the same as

  .. code-block:: cmake

    feature_summary(WHAT DISABLED_FEATURES DESCRIPTION "Disabled features:")
#]=======================================================================]
function(PRINT_DISABLED_FEATURES)
  message(DEPRECATION "PRINT_DISABLED_FEATURES is deprecated. Use
    feature_summary(WHAT DISABLED_FEATURES DESCRIPTION \"Disabled features:\")")
  FEATURE_SUMMARY(WHAT DISABLED_FEATURES  DESCRIPTION "Disabled features:")
endfunction()