CMake/Modules/CMakePrintHelpers.cmake

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

#[=======================================================================[.rst:
CMakePrintHelpers
-----------------

Convenience functions for printing properties and variables, useful
e.g. for debugging.

Commands
^^^^^^^^

.. command:: cmake_print_properties

  .. code-block:: cmake

    cmake_print_properties(<TARGETS       [<target1> ...] |
                            SOURCES       [<source1> ...] |
                            DIRECTORIES   [<dir1> ...]    |
                            TESTS         [<test1> ...]   |
                            CACHE_ENTRIES [<entry1> ...]  >
                           PROPERTIES [<prop1> ...])

  This function prints the values of the properties of the given targets,
  source files, directories, tests or cache entries.  Exactly one of the
  scope keywords must be used.  The scope keyword and its arguments must
  come before the ``PROPERTIES`` keyword in the arguments list.

.. command:: cmake_print_variables

  .. code-block:: cmake

    cmake_print_variables([var1 [var2 ... [varN]]])

  This function prints the name of each variable followed by its value.

Examples
^^^^^^^^

Printing the ``LOCATION`` and ``INTERFACE_INCLUDE_DIRECTORIES`` properties for
both targets ``foo`` and ``bar``:

.. code-block:: cmake

  include(CMakePrintHelpers)

  cmake_print_properties(
    TARGETS foo bar
    PROPERTIES LOCATION INTERFACE_INCLUDE_DIRECTORIES
  )

Gives::

  --
   Properties for TARGET foo:
     foo.LOCATION = "/usr/lib/libfoo.so"
     foo.INTERFACE_INCLUDE_DIRECTORIES = "/usr/include;/usr/include/foo"
   Properties for TARGET bar:
     bar.LOCATION = "/usr/lib/libbar.so"
     bar.INTERFACE_INCLUDE_DIRECTORIES = "/usr/include;/usr/include/bar"

Printing given variables:

.. code-block:: cmake

  include(CMakePrintHelpers)

  cmake_print_variables(CMAKE_C_COMPILER CMAKE_MAJOR_VERSION NOT_EXISTS)

Gives::

  -- CMAKE_C_COMPILER="/usr/bin/cc" ; CMAKE_MAJOR_VERSION="3" ; NOT_EXISTS=""
#]=======================================================================]

function(cmake_print_variables)
  set(msg "")
  foreach(var ${ARGN})
    if(msg)
      string(APPEND msg " ; ")
    endif()
    string(APPEND msg "${var}=\"${${var}}\"")
  endforeach()
  message(STATUS "${msg}")
endfunction()


function(cmake_print_properties)
  set(options )
  set(oneValueArgs )
  set(cpp_multiValueArgs PROPERTIES )
  set(cppmode_multiValueArgs TARGETS SOURCES TESTS DIRECTORIES CACHE_ENTRIES )

  string(JOIN " " _mode_names ${cppmode_multiValueArgs})
  set(_missing_mode_message
    "Mode keyword missing in cmake_print_properties() call, there must be exactly one of ${_mode_names}")

  cmake_parse_arguments(
    CPP "${options}" "${oneValueArgs}" "${cpp_multiValueArgs}" ${ARGN})

  if(NOT CPP_PROPERTIES)
    message(FATAL_ERROR
      "Required argument PROPERTIES missing in cmake_print_properties() call")
    return()
  endif()

  if(NOT CPP_UNPARSED_ARGUMENTS)
    message(FATAL_ERROR "${_missing_mode_message}")
    return()
  endif()

  cmake_parse_arguments(
    CPPMODE "${options}" "${oneValueArgs}" "${cppmode_multiValueArgs}"
    ${CPP_UNPARSED_ARGUMENTS})

  if(CPPMODE_UNPARSED_ARGUMENTS)
    message(FATAL_ERROR
      "Unknown keywords given to cmake_print_properties(): \"${CPPMODE_UNPARSED_ARGUMENTS}\"")
    return()
  endif()

  set(mode)
  set(items)
  set(keyword)

  if(CPPMODE_TARGETS)
    set(items ${CPPMODE_TARGETS})
    set(mode ${mode} TARGETS)
    set(keyword TARGET)
  endif()

  if(CPPMODE_SOURCES)
    set(items ${CPPMODE_SOURCES})
    set(mode ${mode} SOURCES)
    set(keyword SOURCE)
  endif()

  if(CPPMODE_TESTS)
    set(items ${CPPMODE_TESTS})
    set(mode ${mode} TESTS)
    set(keyword TEST)
  endif()

  if(CPPMODE_DIRECTORIES)
    set(items ${CPPMODE_DIRECTORIES})
    set(mode ${mode} DIRECTORIES)
    set(keyword DIRECTORY)
  endif()

  if(CPPMODE_CACHE_ENTRIES)
    set(items ${CPPMODE_CACHE_ENTRIES})
    set(mode ${mode} CACHE_ENTRIES)
    # This is a workaround for the fact that passing `CACHE` as an argument to
    # set() causes a cache variable to be set.
    set(keyword "")
    string(APPEND keyword CACHE)
  endif()

  if(NOT mode)
    message(FATAL_ERROR "${_missing_mode_message}")
    return()
  endif()

  list(LENGTH mode modeLength)
  if("${modeLength}" GREATER 1)
    message(FATAL_ERROR
      "Multiple mode keywords used in cmake_print_properties() call, there must be exactly one of ${_mode_names}.")
    return()
  endif()

  set(msg "\n")
  foreach(item ${items})

    set(itemExists TRUE)
    if(keyword STREQUAL "TARGET")
      if(NOT TARGET ${item})
        set(itemExists FALSE)
        string(APPEND msg "\n No such TARGET \"${item}\" !\n\n")
      endif()
    endif()

    if (itemExists)
      string(APPEND msg " Properties for ${keyword} ${item}:\n")
      foreach(prop ${CPP_PROPERTIES})

        get_property(propertySet ${keyword} ${item} PROPERTY "${prop}" SET)

        if(propertySet)
          get_property(property ${keyword} ${item} PROPERTY "${prop}")
          string(APPEND msg "   ${item}.${prop} = \"${property}\"\n")
        else()
          string(APPEND msg "   ${item}.${prop} = <NOTFOUND>\n")
        endif()
      endforeach()
    endif()

  endforeach()
  message(STATUS "${msg}")

endfunction()