# Copyright (C) 2008-2014 LAAS-CNRS, JRL AIST-CNRS.
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program.  If not, see <http://www.gnu.org/licenses/>.

# MANPAGE
# -------
#
# Generate a pod man page from a template, then generate the man page and
# compress it. This macro also adds the installation rules.
#
macro(MANPAGE NAME)
  if(WIN32)
    message(FATAL_ERROR "This macro is not supported on Microsoft Windows.")
  endif(WIN32)

  find_program(POD2MAN pod2man)
  find_program(GZIP gzip)
  configure_file(${NAME}.pod.in ${CMAKE_CURRENT_BINARY_DIR}/${NAME}.pod @ONLY)

  add_custom_command(
    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${NAME}.1
    COMMAND ${POD2MAN} --section=1 --center="LOCAL USER COMMANDS" --release
            ${PROJECT_NAME} ${NAME}.pod > ${NAME}.1
    DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${NAME}.pod)

  add_custom_command(
    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${NAME}.1.gz
    COMMAND ${GZIP} -c ${NAME}.1 > ${NAME}.1.gz
    DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${NAME}.1)

  # Trigger man page generation at install.
  install(CODE "EXECUTE_PROCESS(COMMAND ${CMAKE_MAKE_PROGRAM} man)")

  # Detects if PKGMAN has been specified
  set(DESTINATION_MAN_PAGE share/man/man1)
  if(MANDIR)
    set(DESTINATION_MAN_PAGE ${MANDIR}/man1)
  endif(MANDIR)

  # Install man page.
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${NAME}.1.gz
          DESTINATION ${DESTINATION_MAN_PAGE})

  list(APPEND LOGGING_WATCHED_VARIABLES POD2MAN GZIP)
endmacro(MANPAGE)