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FileInformation.cmake
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# - CMake module for getting file information such as size and modification date
#
# This module overrides the built-in CMake command file to provide two additional sub-commands
# SIZE and TIMESTAMP on all platforms. Under UNIX the sub-commands USER_NAME, GROUP_NAME and
# PERMISSIONS are also provided.
#
# file (SIZE filename var)
# SIZE will store the size of the file in bytes into the variable.
#
# file (TIMESTAMP filename var)
# TIMESTAMP will store the modification date of the file into the variable as an ISO 8601
# formatted string (e.g., "2011-07-02T13:00:22"). The chronological order of two timestamps
# can be determined with a STRLESS, STRGREATER or STREQUAL expression.
#
# get_timestamp_component (var timestamp TIMESTAMP|DATE|TIME|YEAR|MONTH|DAY|HOUR|MINUTE|SECOND|TIMEZONE ...)
# gets a specific component of a ISO 8601 formatted string. Multiple components can be
# retrieved at the same time as a list.
#
# current_timestamp (var [ TIMESTAMP|DATE|TIME|YEAR|MONTH|DAY|HOUR|MINUTE|SECOND|TIMEZONE ... ])
# will store the current date and time into the variable as an ISO 8601 formatted string.
# Optionally components of the current date and time can be retrieved as a list instead.
#
# The following sub-commands are available on UNIX and Apple (Mac OS X) only:
#
# file (USER_NAME filename var)
# USER_NAME will store the user name of the file owner into the variable.
#
# file (GROUP_NAME filename var)
# GROUP_NAME will store the group name of the file owner into the variable.
#
# file (PERMISSIONS filename var)
# PERMISSIONS will store the the permissions of the file into the variable as a list.
# Valid permissions are OWNER_READ, OWNER_WRITE, OWNER_EXECUTE, GROUP_READ, GROUP_WRITE,
# GROUP_EXECUTE, WORLD_READ, WORLD_WRITE, WORLD_EXECUTE, SETUID, and SETGID.
#
#=============================================================================
# Copyright 2011-2013 Sascha Kratky
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#=============================================================================
get_filename_component(FileInformation_CMAKE_MODULE_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
set (FileInformation_CMAKE_MODULE_VERSION "1.2.0")
find_program(BASH bash)
# private function which invokes platform specific helper script
function (_invoke_helper_script _command _filePath _outputVar _exitCodeVar)
if (CMAKE_HOST_UNIX)
set (_helperScript "${FileInformation_CMAKE_MODULE_DIR}/FileInformation.sh")
# make sure helper script is executable
execute_process(COMMAND chmod "-f" "+x" "${_helperScript}" TIMEOUT 5)
elseif (CMAKE_HOST_WIN32)
set (_helperScript "${FileInformation_CMAKE_MODULE_DIR}/FileInformation.cmd")
# Windows requires native paths
file (TO_NATIVE_PATH "${_helperScript}" _helperScript)
if (_filePath)
file (TO_NATIVE_PATH "${_filePath}" _filePath)
endif()
else()
message (FATAL_ERROR "Unsupported host platform ${CMAKE_HOST_SYSTEM_NAME}.")
endif()
string (TOLOWER "${_command}" _cmd)
execute_process(
COMMAND "${BASH}" "${_helperScript}" "--${_cmd}" "${_filePath}"
TIMEOUT 5
RESULT_VARIABLE _result
OUTPUT_VARIABLE _output
OUTPUT_STRIP_TRAILING_WHITESPACE)
set (${_exitCodeVar} ${_result} PARENT_SCOPE)
set (${_outputVar} ${_output} PARENT_SCOPE)
endfunction()
if (NOT COMMAND get_timestamp_component)
# do not override get_timestamp_component if it already exists
function (get_timestamp_component _outputVar _timestamp)
if (${ARGC} LESS 3)
message (FATAL_ERROR "timestamp requires at least three arguments.")
endif()
string(STRIP "${_timestamp}" _timestamp)
if ("${_timestamp}" MATCHES "([0-9-]+)T([0-9:Z+-]+)")
set (_date "${CMAKE_MATCH_1}")
set (_time "${CMAKE_MATCH_2}")
if ("${_date}" MATCHES "([0-9][0-9][0-9][0-9])(-?([0-9][0-9])(-?([0-9][0-9]))?)?")
set (_year "${CMAKE_MATCH_1}")
set (_month "${CMAKE_MATCH_3}")
set (_day "${CMAKE_MATCH_5}")
else()
unset(_year)
unset(_month)
unset(_day)
endif()
if ("${_time}" MATCHES "([0-9][0-9])(:?([0-9][0-9])(:?([0-9][0-9]))?)?(Z|([+-][0-9:]+))?")
set (_hour "${CMAKE_MATCH_1}")
set (_minute "${CMAKE_MATCH_3}")
set (_second "${CMAKE_MATCH_5}")
set (_timezone "${CMAKE_MATCH_6}")
if (_timezone)
# if time is UTC, use +00:00
string (REPLACE "Z" "+0000" _timezone "${_timezone}")
# use canonical representation of time zone
string (REPLACE ":" "" _timezone "${_timezone}")
string (REGEX REPLACE "^[0-9][0-9]$" "\\000" _timezone "${_timezone}")
endif()
else()
unset(_hour)
unset(_minute)
unset(_second)
endif()
set (_result "")
foreach (_component ${ARGN})
string (TOLOWER "_${_component}" _componentVar)
if (DEFINED "${_componentVar}" AND
"${${_componentVar}}" MATCHES ".+")
set (_componentValue "${${_componentVar}}")
else()
message (WARNING
"get_timestamp_component cannot extract component ${_component}.")
set (_componentValue "${_component}-NOTFOUND")
endif()
list (APPEND _result ${_componentValue})
endforeach()
else()
message (SEND_ERROR
"get_timestamp_component ${_timeStamp} is not an ISO 8601 string.")
set (_result "TIMESTAMP-NOTFOUND")
endif()
set (${_outputVar} ${_result} PARENT_SCOPE)
endfunction()
endif()
if (NOT COMMAND current_timestamp)
# do not override current_timestamp if it already exists
function (current_timestamp _outputVar)
_invoke_helper_script("current_timestamp" "" _result _exitCode)
if (NOT ${_exitCode} EQUAL 0)
message (SEND_ERROR "current_timestamp failed.")
set (_result "TIMESTAMP-NOTFOUND")
elseif (${ARGC} GREATER 1)
get_timestamp_component (_result "${_result}" ${ARGN})
endif()
set (${_outputVar} ${_result} PARENT_SCOPE)
endfunction()
endif()
macro (file)
if ("${ARGV0}" MATCHES "SIZE|TIMESTAMP|PERMISSIONS|USER_NAME|GROUP_NAME")
if (NOT ${ARGC} EQUAL 3)
message (FATAL_ERROR "file sub-command ${ARGV0} requires two arguments.")
endif()
set (_filePath "${ARGV1}")
set (_varName "${ARGV2}")
get_filename_component(_filePath "${_filePath}" ABSOLUTE)
if (NOT EXISTS "${_filePath}")
message (FATAL_ERROR "file ${ARGV0} ${_filePath} does not exist.")
endif()
if ("${ARGV0}" STREQUAL "SIZE" AND IS_DIRECTORY "${_filePath}")
message (FATAL_ERROR "file ${ARGV0} ${_filePath} is a directory.")
endif()
_invoke_helper_script("${ARGV0}" "${_filePath}" ${_varName} _exitCode)
if (NOT ${_exitCode} EQUAL 0)
message (SEND_ERROR "file ${ARGV0} failed for ${_filePath}.")
set (${_varName} "${ARGV0}-NOTFOUND")
endif()
else()
# pass call to original file function
_file (${ARGV})
endif()
endmacro()