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

if(NOT CMake_SOURCE_DIR)
  set(CMakeHelp_STANDALONE 1)
  cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
  get_filename_component(tmp "${CMAKE_CURRENT_SOURCE_DIR}" PATH)
  get_filename_component(CMake_SOURCE_DIR "${tmp}" PATH)
  include(${CMake_SOURCE_DIR}/Modules/CTestUseLaunchers.cmake)
  include(${CMake_SOURCE_DIR}/Source/CMakeVersionCompute.cmake)
  include(${CMake_SOURCE_DIR}/Source/CMakeInstallDestinations.cmake)
  unset(CMAKE_DATA_DIR)
  unset(CMAKE_DATA_DIR CACHE)
  macro(CMake_OPTIONAL_COMPONENT)
    set(COMPONENT "")
  endmacro()
endif()
project(CMakeHelp NONE)

option(SPHINX_MAN "Build man pages with Sphinx" OFF)
option(SPHINX_HTML "Build html help with Sphinx" OFF)
option(SPHINX_SINGLEHTML "Build html single page help with Sphinx" OFF)
option(SPHINX_QTHELP "Build Qt help with Sphinx" OFF)
option(SPHINX_TEXT "Build text help with Sphinx (not installed)" OFF)
find_program(SPHINX_EXECUTABLE
  NAMES sphinx-build
  DOC "Sphinx Documentation Builder (sphinx-doc.org)"
  )
set(SPHINX_FLAGS "" CACHE STRING "Flags to pass to sphinx-build")
separate_arguments(sphinx_flags UNIX_COMMAND "${SPHINX_FLAGS}")

mark_as_advanced(SPHINX_TEXT)
mark_as_advanced(SPHINX_FLAGS)

if(NOT SPHINX_MAN AND NOT SPHINX_HTML AND NOT SPHINX_SINGLEHTML AND NOT SPHINX_QTHELP AND NOT SPHINX_TEXT)
  return()
elseif(NOT SPHINX_EXECUTABLE)
  message(FATAL_ERROR "SPHINX_EXECUTABLE (sphinx-build) is not found!")
endif()

set(copyright_line_regex "^Copyright (2000-20[0-9][0-9] Kitware.*)")
file(STRINGS "${CMake_SOURCE_DIR}/Copyright.txt" copyright_line
  LIMIT_COUNT 1 REGEX "${copyright_line_regex}")
if(copyright_line MATCHES "${copyright_line_regex}")
  set(conf_copyright "${CMAKE_MATCH_1}")
else()
  set(conf_copyright "Kitware, Inc.")
endif()

set(conf_docs "${CMake_SOURCE_DIR}/Help")
set(conf_path "${CMAKE_CURRENT_SOURCE_DIR}")
set(conf_version "${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}.${CMake_VERSION_PATCH}")
set(conf_release "${CMake_VERSION}")
configure_file(conf.py.in conf.py @ONLY)

set(doc_formats "")
if(SPHINX_HTML)
  list(APPEND doc_formats html)
endif()
if(SPHINX_MAN)
  list(APPEND doc_formats man)
endif()
if(SPHINX_SINGLEHTML)
  list(APPEND doc_formats singlehtml)
endif()
if(SPHINX_TEXT)
  list(APPEND doc_formats text)
endif()
if(SPHINX_QTHELP)
  find_package(PythonInterp REQUIRED)

  find_program(QCOLLECTIONGENERATOR_EXECUTABLE
    NAMES qcollectiongenerator
    DOC "qcollectiongenerator tool"
    )
  if (NOT QCOLLECTIONGENERATOR_EXECUTABLE)
    message(FATAL_ERROR "QCOLLECTIONGENERATOR_EXECUTABLE (qcollectiongenerator) not found!")
  endif()
  list(APPEND doc_formats qthelp)

  set(qthelp_extra_commands
    # Workaround for assistant prior to
    # https://codereview.qt-project.org/#change,82250 in Qt 4.
    COMMAND ${CMAKE_COMMAND} "-DCSS_DIR=${CMAKE_CURRENT_BINARY_DIR}/qthelp/_static"
      -P "${CMAKE_CURRENT_SOURCE_DIR}/apply_qthelp_css_workaround.cmake"
    # Workaround sphinx configurability:
    # https://bitbucket.org/birkenfeld/sphinx/issue/1448/make-qthelp-more-configurable
    COMMAND ${CMAKE_COMMAND} "-DQTHELP_DIR=${CMAKE_CURRENT_BINARY_DIR}/qthelp/"
      "-DCMake_VERSION=${CMake_VERSION_MAJOR}${CMake_VERSION_MINOR}${CMake_VERSION_PATCH}"
      -P "${CMAKE_CURRENT_SOURCE_DIR}/fixup_qthelp_names.cmake"

    # Create proper identifiers. Workaround for
    # https://bitbucket.org/birkenfeld/sphinx/issue/1491/qthelp-should-generate-identifiers-for
    COMMAND "${PYTHON_EXECUTABLE}"
      "${CMAKE_CURRENT_SOURCE_DIR}/create_identifiers.py"
      "${CMAKE_CURRENT_BINARY_DIR}/qthelp/"

    COMMAND ${QCOLLECTIONGENERATOR_EXECUTABLE}
      ${CMAKE_CURRENT_BINARY_DIR}/qthelp/CMake.qhcp
  )
endif()


set(doc_format_outputs "")
set(doc_format_last "")
foreach(format ${doc_formats})
  set(doc_format_output "doc_format_${format}")
  set(doc_format_log "build-${format}.log")
  add_custom_command(
    OUTPUT ${doc_format_output}
    COMMAND ${SPHINX_EXECUTABLE}
            -c ${CMAKE_CURRENT_BINARY_DIR}
            -d ${CMAKE_CURRENT_BINARY_DIR}/doctrees
            -b ${format}
            ${sphinx_flags}
            ${CMake_SOURCE_DIR}/Help
            ${CMAKE_CURRENT_BINARY_DIR}/${format}
            > ${doc_format_log} # log stdout, pass stderr
    ${${format}_extra_commands}
    DEPENDS ${doc_format_last}
    COMMENT "sphinx-build ${format}: see Utilities/Sphinx/${doc_format_log}"
    VERBATIM
    )
  set_property(SOURCE ${doc_format_output} PROPERTY SYMBOLIC 1)
  list(APPEND doc_format_outputs ${doc_format_output})
  set(doc_format_last ${doc_format_output})
endforeach()

add_custom_target(documentation ALL DEPENDS ${doc_format_outputs})

if(CMake_SPHINX_DEPEND_ON_EXECUTABLES)
  foreach(t
      cmake
      ccmake
      cmake-gui
      cpack
      ctest
      )
    if(TARGET ${t})
      # Build documentation after main executables.
      add_dependencies(documentation ${t})
    endif()
  endforeach()
endif()

if(SPHINX_MAN)
  file(GLOB man_rst RELATIVE ${CMake_SOURCE_DIR}/Help/manual
    ${CMake_SOURCE_DIR}/Help/manual/*.[1-9].rst)
  foreach(m ${man_rst})
    if("x${m}" MATCHES "^x(.+)\\.([1-9])\\.rst$")
      set(name "${CMAKE_MATCH_1}")
      set(sec "${CMAKE_MATCH_2}")
      set(skip FALSE)
      if(NOT CMakeHelp_STANDALONE)
        if(name STREQUAL "ccmake" AND NOT BUILD_CursesDialog)
          set(skip TRUE)
        elseif(name STREQUAL "cmake-gui" AND NOT BUILD_QtDialog)
          set(skip TRUE)
        endif()
      endif()
      if(NOT skip)
        CMake_OPTIONAL_COMPONENT(sphinx-man)
        install(FILES ${CMAKE_CURRENT_BINARY_DIR}/man/${name}.${sec}
                DESTINATION ${CMAKE_MAN_DIR}/man${sec}
                ${COMPONENT})
      endif()
      unset(skip)
    endif()
  endforeach()
endif()

if(SPHINX_HTML)
  CMake_OPTIONAL_COMPONENT(sphinx-html)
  install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html
          DESTINATION ${CMAKE_DOC_DIR}
          ${COMPONENT}
          PATTERN .buildinfo EXCLUDE
          )
endif()

if(SPHINX_SINGLEHTML)
  CMake_OPTIONAL_COMPONENT(sphinx-singlehtml)
  install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/singlehtml
          DESTINATION ${CMAKE_DOC_DIR}
          ${COMPONENT}
          PATTERN .buildinfo EXCLUDE
          )
endif()

if(SPHINX_QTHELP)
  CMake_OPTIONAL_COMPONENT(sphinx-qthelp)
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/qthelp/CMake-${CMake_VERSION_MAJOR}${CMake_VERSION_MINOR}${CMake_VERSION_PATCH}.qch
          DESTINATION ${CMAKE_DOC_DIR} ${COMPONENT}
          )
endif()