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# doxygen_version.cmake
#
# This file defines the functions and targets needed to monitor
# doxygen VERSION file.
#
# The behavior of this script can be modified by defining any of these variables:
#
# PRE_CONFIGURE_DOXYGEN_VERSION_FILE (REQUIRED)
# -- The path to the file that'll be configured.
#
# POST_CONFIGURE_DOXYGEN_VERSION_FILE (REQUIRED)
# -- The path to the configured PRE_CONFIGURE_DOXYGEN_VERSION_FILE.
#
# DOXY_STATE_FILE (OPTIONAL)
# -- The path to the file used to store the doxygen version information.
#
# This file is based on git_watcher.cmake
# Short hand for converting paths to absolute.
macro(PATH_TO_ABSOLUTE var_name)
get_filename_component(${var_name} "${${var_name}}" ABSOLUTE)
endmacro()
# Check that a required variable is set.
macro(CHECK_REQUIRED_VARIABLE var_name)
if(NOT DEFINED ${var_name})
message(FATAL_ERROR "The \"${var_name}\" variable must be defined.")
endif()
PATH_TO_ABSOLUTE(${var_name})
endmacro()
# Check that an optional variable is set, or, set it to a default value.
macro(CHECK_OPTIONAL_VARIABLE var_name default_value)
if(NOT DEFINED ${var_name})
set(${var_name} ${default_value})
endif()
PATH_TO_ABSOLUTE(${var_name})
endmacro()
CHECK_REQUIRED_VARIABLE(PRE_CONFIGURE_DOXYGEN_VERSION_FILE)
CHECK_REQUIRED_VARIABLE(POST_CONFIGURE_DOXYGEN_VERSION_FILE)
CHECK_OPTIONAL_VARIABLE(DOXY_STATE_FILE "${CMAKE_SOURCE_DIR}/VERSION")
# Function: DoxygenStateChangedAction
# Description: this function is executed when the
# doxygen version file has changed.
function(DoxygenStateChangedAction _state_as_list)
# Set variables by index, then configure the file w/ these variables defined.
LIST(GET _state_as_list 0 DOXYGEN_VERSION)
configure_file("${PRE_CONFIGURE_DOXYGEN_VERSION_FILE}" "${POST_CONFIGURE_DOXYGEN_VERSION_FILE}" @ONLY)
endfunction()
# Function: SetupDoxyMonitoring
# Description: this function sets up custom commands that make the build system
# check the doxygen version file before every build. If it has
# changed, then a file is configured.
function(SetupDoxyMonitoring)
add_custom_target(check_doxygen_version
ALL
DEPENDS ${PRE_CONFIGURE_DOXYGEN_VERSION_FILE}
BYPRODUCTS ${POST_CONFIGURE_DOXYGEN_VERSION_FILE}
COMMENT "Checking the doxygen version for changes..."
COMMAND
${CMAKE_COMMAND}
-D_BUILD_TIME_CHECK_DOXY=TRUE
-DDOXY_STATE_FILE=${DOXY_STATE_FILE}
-DPRE_CONFIGURE_DOXYGEN_VERSION_FILE=${PRE_CONFIGURE_DOXYGEN_VERSION_FILE}
-DPOST_CONFIGURE_DOXYGEN_VERSION_FILE=${POST_CONFIGURE_DOXYGEN_VERSION_FILE}
-P "${CMAKE_CURRENT_LIST_FILE}")
endfunction()
# Function: Main
# Description: primary entry-point to the script. Functions are selected based
# on whether it's configure or build time.
function(Main)
file(STRINGS "${DOXY_STATE_FILE}" DOXYGEN_VERSION)
if(_BUILD_TIME_CHECK_DOXY)
# Check if the doxygen version file has changed.
# If so, run the change action.
if(${DOXY_STATE_FILE} IS_NEWER_THAN ${POST_CONFIGURE_DOXYGEN_VERSION_FILE})
DoxygenStateChangedAction("${DOXYGEN_VERSION}")
endif()
else()
# >> Executes at configure time.
SetupDoxyMonitoring()
DoxygenStateChangedAction("${DOXYGEN_VERSION}")
endif()
endfunction()
# And off we go...
Main()
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