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#=============================================================================
# Copyright Kitware, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#=============================================================================
project(CastXMLDoc NONE)

option(SPHINX_MAN "Build man pages with Sphinx" OFF)
option(SPHINX_HTML "Build html pages with Sphinx" OFF)
find_program(SPHINX_EXECUTABLE
  NAMES sphinx-build
  DOC "Sphinx Documentation Builder (sphinx-doc.org)"
  )

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

set(copyright_line_regex "^Copyright (2013-20[0-9][0-9] Kitware.*)")
file(STRINGS "${CastXML_SOURCE_DIR}/NOTICE" copyright_line
  LIMIT_COUNT 1 REGEX "${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 "${CastXML_SOURCE_DIR}/doc")
set(conf_path "${CMAKE_CURRENT_SOURCE_DIR}")
set(conf_version "${CastXML_VERSION}")
set(conf_release "${CastXML_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()

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}
            ${CastXML_SOURCE_DIR}/doc
            ${CMAKE_CURRENT_BINARY_DIR}/${format}
            > ${doc_format_log} # log stdout, pass stderr
    DEPENDS ${doc_format_last}
    COMMENT "sphinx-build ${format}: see doc/${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(SPHINX_MAN)
  file(GLOB man_rst RELATIVE ${CastXML_SOURCE_DIR}/doc/manual
    ${CastXML_SOURCE_DIR}/doc/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}")
      install(FILES ${CMAKE_CURRENT_BINARY_DIR}/man/${name}.${sec}
              DESTINATION ${CastXML_INSTALL_MAN_DIR}/man${sec})
    endif()
  endforeach()
endif()

if(SPHINX_HTML)
  install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html
          DESTINATION ${CastXML_INSTALL_DOC_DIR}
          PATTERN .buildinfo EXCLUDE
          PATTERN objects.inv EXCLUDE
          )
endif()