# This file is part of the Owl Positioning System (OwlPS) project.
# It is subject to the copyright notice and license terms in the
# COPYRIGHT.t2t file found in the top-level directory of this
# distribution and at
#   http://code.lm7.fr/p/owlps/source/tree/master/COPYRIGHT.t2t
# No part of the OwlPS Project, including this file, may be copied,
# modified, propagated, or distributed except according to the terms
# contained in the COPYRIGHT.t2t file; the COPYRIGHT.t2t file must be
# distributed along with this file, either separately or by replacing
# this notice by the COPYRIGHT.t2t file's contents.


set(MAN_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/man")
add_custom_target(doc ALL true)


### txt2tags manual pages ###

# Make sure txt2tags is available
find_package(Txt2tags)
if (NOT TXT2TAGS_FOUND)
  message(WARNING
    "Couldn't find txt2tags: disabling generation of txt2tags-based man pages")
else()

  set(PREPROC_MAN ./preproc-man.sh)

  function(add_manpage PAGENAME SECTION)
    set(OUTPUT_DIRECTORY "${MAN_OUTPUT_DIRECTORY}/man${SECTION}")
    set(SOURCE ${PAGENAME}.t2t)
    set(TARGETNAME ${PAGENAME}.${SECTION})
    set(TARGET "${OUTPUT_DIRECTORY}/${TARGETNAME}")

    # Create the output directory
    # Note: this is done only when first calling cmake and when rebuilding
    # cache; it would be nice if it could be called every time, but there
    # doesn't seem to be any simple solution.
    file(MAKE_DIRECTORY "${OUTPUT_DIRECTORY}")

    # Command to generate the man page
    add_custom_command(
      OUTPUT "${TARGET}"
      COMMAND "${PREPROC_MAN}" "${SOURCE}" | "${TXT2TAGS_EXECUTABLE}" -q --infile=- --outfile="${TARGET}" -t man
      DEPENDS "${SOURCE}"
      WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
      COMMENT "Generating ${TARGETNAME}")

    # Set up the target
    add_custom_target(${TARGETNAME} true DEPENDS "${TARGET}")

    # Add the target to the "doc" meta-target
    add_dependencies(doc "${TARGETNAME}")
  endfunction()

  add_manpage(owlps 7)
  add_manpage(owlps-architecture 7)
  add_manpage(owlps-deployment 7)
  add_manpage(owlps-client 1)
  add_manpage(owlps-listenerd 1)
  add_manpage(owlps-aggregatord 1)

endif()


### pod2man-generated man pages ###

find_package(Pod2man)
if (NOT POD2MAN_FOUND)
  message(WARNING
    "Couldn't find pod2man: disabling generation of man pages for Perl programs")
else()

  function(add_pod_manpage SOURCE PAGENAME SECTION)
    set(OUTPUT_DIRECTORY "${MAN_OUTPUT_DIRECTORY}/man${SECTION}")
    set(TARGETNAME "${PAGENAME}.${SECTION}")
    # Change TARGETNAME so that the CMake target don't contain any ':'
    string(REGEX REPLACE ":" "-" TARGETNAME ${TARGETNAME})
    set(TARGET "${OUTPUT_DIRECTORY}/${TARGETNAME}")

    # Create the output directory
    # Note: this is done only when first calling cmake and when rebuilding
    # cache; it would be nice if it could be called every time, but there
    # doesn't seem to be any simple solution.
    file(MAKE_DIRECTORY "${OUTPUT_DIRECTORY}")

    # Get source file last modification date from the git history
    execute_process(
      COMMAND git log -1 --pretty=%ai "${SOURCE}"
      WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
      RESULT_VARIABLE RET
      OUTPUT_VARIABLE DATE
      ERROR_QUIET
      OUTPUT_STRIP_TRAILING_WHITESPACE)
    # Take only the first field (the date without the time)
    string(REGEX REPLACE " .*" "" DATE ${DATE})

    # Command to generate the man page
    add_custom_command(
      OUTPUT "${TARGET}"
      COMMAND "${POD2MAN_EXECUTABLE}" --center "OwlPS User Manual" --release "OwlPS ${OWLPS_VERSION}" --date "${DATE}" "${SOURCE}" "${TARGET}"
      DEPENDS "${SOURCE}"
      COMMENT "Generating ${TARGETNAME}")

    # Set up the target
    add_custom_target("${TARGETNAME}" true DEPENDS "${TARGET}")

    # Add the target to the "doc" meta-target
    add_dependencies(doc "${TARGETNAME}")
  endfunction()

  add_pod_manpage(${CMAKE_SOURCE_DIR}/scripts/owlps-aggcheck.pl owlps-aggcheck 1)
  add_pod_manpage(${CMAKE_SOURCE_DIR}/scripts/owlps-aggsetcoord.pl owlps-aggsetcoord 1)
  add_pod_manpage(${CMAKE_SOURCE_DIR}/scripts/OwlPS/CSV.pm OwlPS::CSV 3perl)
  add_pod_manpage(${CMAKE_SOURCE_DIR}/scripts/OwlPS/TimeInterpolation.pm OwlPS::TimeInterpolation 3perl)

endif()


### Doxygen-generated man pages ###

if (NOT DOXYGEN_FOUND)
  message(WARNING
    "Couldn't find Doxygen: disabling generation of Doxygen-based man pages")
  return()
endif()

# Base output directory for Doxygen (it will append "man" for the
# man pages, "html" for the HTML output, etc.)
set(DOXYGEN_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}")
# Section of the man pages we generate
set(SECTION 3)
# Final output directory (as assembled by Doxygen)
set(OUTPUT_DIRECTORY "${DOXYGEN_OUTPUT_DIRECTORY}/man/man${SECTION}")
# Output files
set(DOXYGEN_MANPAGES "${OUTPUT_DIRECTORY}/owlps.h.${SECTION}" "${OUTPUT_DIRECTORY}/owlps-client.h.${SECTION}" "${OUTPUT_DIRECTORY}/owlps-resultreader.h.${SECTION}")
# Doxygen configuration file name
set(DOXYFILE Doxyfile)

add_custom_command(
  OUTPUT ${DOXYGEN_MANPAGES}
  COMMAND DOXYGEN_OUTPUT_DIRECTORY=${DOXYGEN_OUTPUT_DIRECTORY} DOXYGEN_MAN_EXTENSION=.${SECTION} OWLPS_VERSION=${OWLPS_VERSION} "${DOXYGEN_EXECUTABLE}" "${DOXYFILE}"
  WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
  COMMENT "Generating Doxygen-based man pages")

# Target to clean the files generated by Doxygen that we don't want
# (so-called "directory references"). This cannot be done with CMake's
# file() commands because it has to be run every time the target is
# built, and you cannot use CMake functions in a custom target or
# command.
add_custom_target(clean_doxygen_garbage
  COMMAND rm -f "${OUTPUT_DIRECTORY}/_*_owlps_libowlps*_.${SECTION}")

# Set up the target
add_custom_target(doc_doxygen true DEPENDS ${DOXYGEN_MANPAGES})

# Add the target to the "doc" meta-target
add_dependencies(doc doc_doxygen clean_doxygen_garbage)