#
# Based on work of Emmanuel Roullit <emmanuel@netsniff-ng.org>
# Copyright 2009, 2012 Emmanuel Roullit.
# Subject to the GPL, version 2.
#
MACRO(ADD_MANPAGE_TARGET)
  # It is not possible add a dependency to target 'install'
  # Run hard-coded 'make man' when 'make install' is invoked
  INSTALL(CODE "EXECUTE_PROCESS(COMMAND make man)")
  ADD_CUSTOM_TARGET(man)
ENDMACRO(ADD_MANPAGE_TARGET)

FIND_PROGRAM(RONN ronn)
FIND_PROGRAM(GZIP gzip)

IF (NOT RONN OR NOT GZIP)
  IF (NOT RONN)
    message(WARNING "ronn not found, manpages won't be generated")
  ENDIF(NOT RONN)
  IF (NOT GZIP)
    message(WARNING "gzip not found, manpages won't be generated")
  ENDIF(NOT GZIP)
  # empty macro
  MACRO(manpage MANFILE)
  ENDMACRO(manpage)
  SET (MANPAGES_SUPPORT FALSE)
ELSE (NOT RONN OR NOT GZIP)
  MESSAGE (STATUS "Looking for ronn to generate manpages - found")
  SET (MANPAGES_SUPPORT TRUE)

  MACRO(manpage RONNFILE SECTION)
    SET(RONNFILE_FULL_PATH ${CMAKE_CURRENT_SOURCE_DIR}/${RONNFILE})

    ADD_CUSTOM_COMMAND(
      OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${RONNFILE}.${SECTION}
      DEPENDS ${RONNFILE_FULL_PATH}.${SECTION}.ronn
      COMMAND ${RONN}
         ARGS -r --pipe ${RONNFILE_FULL_PATH}.${SECTION}.ronn
         > ${CMAKE_CURRENT_BINARY_DIR}/${RONNFILE}.${SECTION}
    )

    ADD_CUSTOM_COMMAND(
      OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${RONNFILE}.${SECTION}.gz
      DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${RONNFILE}.${SECTION}
      COMMAND ${GZIP} -c ${CMAKE_CURRENT_BINARY_DIR}/${RONNFILE}.${SECTION}
        > ${CMAKE_CURRENT_BINARY_DIR}/${RONNFILE}.${SECTION}.gz
    )

    SET(MANPAGE_TARGET "man-${RONNFILE}")

    ADD_CUSTOM_TARGET(${MANPAGE_TARGET} DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${RONNFILE}.${SECTION}.gz)
    ADD_DEPENDENCIES(man ${MANPAGE_TARGET})

    INSTALL(
      FILES ${CMAKE_CURRENT_BINARY_DIR}/${RONNFILE}.${SECTION}.gz
      DESTINATION share/man/man${SECTION}
    )
  ENDMACRO(manpage RONNFILE SECTION)
ENDIF(NOT RONN OR NOT GZIP)