#
# CMakeLists.txt to build docs for the FLTK project using CMake (www.cmake.org)
#
# Copyright 1998-2021 by Bill Spitzak and others.
#
# This library is free software. Distribution and use rights are outlined in
# the file "COPYING" which should have been included with this file.  If this
# file is missing or damaged, see the license at:
#
#     https://www.fltk.org/COPYING.php
#
# Please see the following page on how to report bugs and issues:
#
#     https://www.fltk.org/bugs.php
#

set (DOCS)

#--------------------------
# build html documentation
#--------------------------

if (OPTION_BUILD_HTML_DOCUMENTATION)

  list (APPEND DOCS html)

  # generate Doxygen file "Doxyfile"

  set (GENERATE_HTML  YES)
  set (GENERATE_LATEX NO)
  set (LATEX_HEADER   "")

  configure_file (
    ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in
    ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
    @ONLY
  )

  configure_file (
    ${CMAKE_CURRENT_SOURCE_DIR}/src/tiny.png
    ${CMAKE_CURRENT_BINARY_DIR}/html/tiny.png
    COPYONLY
  )

  # generate html docs

  add_custom_target (html
    ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
    COMMENT "Generating HTML documentation" VERBATIM
  )

endif (OPTION_BUILD_HTML_DOCUMENTATION)

#--------------------------
# build pdf documentation
#--------------------------

if (OPTION_BUILD_PDF_DOCUMENTATION)

  list (APPEND DOCS pdf)

  # generate Doxygen file "Doxybook"

  set (GENERATE_HTML  NO)
  set (GENERATE_LATEX YES)
  set (LATEX_HEADER   "${CMAKE_CURRENT_BINARY_DIR}/fltk-book.tex")

  # strip potential " (Git-hash)" from the original version
  string (REGEX REPLACE " .*$" "" DOXY_VERSION ${DOXYGEN_VERSION})

  execute_process (COMMAND date +%Y
    OUTPUT_VARIABLE YEAR
  )

  configure_file (
    ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in
    ${CMAKE_CURRENT_BINARY_DIR}/Doxybook
    @ONLY
  )

  # generate LaTeX title fltk-title.tex

  configure_file (
    ${CMAKE_CURRENT_SOURCE_DIR}/src/fltk-title.tex.in
    ${CMAKE_CURRENT_BINARY_DIR}/fltk-title.tex
    @ONLY
  )

  # generate fltk.pdf

  add_custom_command (
    OUTPUT  ${CMAKE_CURRENT_BINARY_DIR}/fltk.pdf
    COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/make_header
            ${CMAKE_CURRENT_BINARY_DIR}/fltk-title.tex
            ${CMAKE_CURRENT_BINARY_DIR}/fltk-book.tex
    COMMAND ${DOXYGEN_EXECUTABLE} Doxybook
    COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/make_pdf
    COMMAND cp -f latex/refman.pdf fltk.pdf
    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
    COMMENT "Generating PDF documentation" VERBATIM
  )

  # add target 'pdf'

  add_custom_target (pdf
    DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/fltk.pdf
  )

endif (OPTION_BUILD_PDF_DOCUMENTATION)

#----------------------------------
# add target 'docs' for all docs
#----------------------------------

if (DOCS)

  add_custom_target (docs
    DEPENDS ${DOCS}
  )

endif (DOCS)

#----------------------------------
# install html + pdf documentation
#----------------------------------

if (OPTION_INSTALL_HTML_DOCUMENTATION AND OPTION_BUILD_HTML_DOCUMENTATION)

  install (DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html
    DESTINATION ${FLTK_DATADIR}/doc/fltk
  )

endif (OPTION_INSTALL_HTML_DOCUMENTATION AND OPTION_BUILD_HTML_DOCUMENTATION)

if (OPTION_INSTALL_PDF_DOCUMENTATION AND OPTION_BUILD_PDF_DOCUMENTATION)

  install (FILES ${CMAKE_CURRENT_BINARY_DIR}/fltk.pdf
    DESTINATION ${FLTK_DATADIR}/doc/fltk/
  )

endif (OPTION_INSTALL_PDF_DOCUMENTATION AND OPTION_BUILD_PDF_DOCUMENTATION)