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
-----------------

This module provides convenience commands, primarily intended for debugging,
to print the values of properties and variables.

Load this module in CMake with:

.. code-block:: cmake

  include(CMakePrintHelpers)

Commands
^^^^^^^^

This module provides the following commands:

.. command:: cmake_print_properties

  Prints the values of properties for the specified targets, source files,
  directories, tests, or cache entries:

  .. code-block:: cmake

    cmake_print_properties(
      <TARGETS       [<targets>...] |
       SOURCES       [<sources>...] |
       DIRECTORIES   [<dirs>...]    |
       TESTS         [<tests>...]   |
       CACHE_ENTRIES [<entries>...] >
      PROPERTIES [<properties>...]
    )

  Exactly one of the scope keywords must be specified.  The scope keyword
  and its arguments must appear before the ``PROPERTIES`` keyword in the
  argument list.

.. command:: cmake_print_variables

  Prints each variable name followed by its value:

  .. code-block:: cmake

    cmake_print_variables([<vars>...])

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()