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The open source OpenXR runtime
1# - Removes duplicate entries and non-directories from a provided list
2#
3# clean_directory_list(<listvar> [<additional list items>...])
4#
5# Requires CMake 2.6 or newer (uses the 'function' command)
6#
7# Original Author:
8# 2009-2010 Rylie Pavlik <rylie@ryliepavlik.com>
9# https://ryliepavlik.com/
10# Iowa State University HCI Graduate Program/VRAC
11#
12# Copyright 2009-2010, Iowa State University.
13#
14# Distributed under the Boost Software License, Version 1.0.
15# (See accompanying file LICENSE_1_0.txt or copy at
16# http://www.boost.org/LICENSE_1_0.txt)
17#
18# SPDX-License-Identifier: BSL-1.0
19
20if(__clean_directory_list)
21 return()
22endif()
23set(__clean_directory_list YES)
24
25function(clean_directory_list _var)
26 # combine variable's current value with additional list items
27 set(_in ${${_var}} ${ARGN})
28
29 if(_in)
30 # Initial list cleaning
31 list(REMOVE_DUPLICATES _in)
32
33 # Grab the absolute path of each actual directory
34 set(_out)
35 foreach(_dir ${_in})
36 if(IS_DIRECTORY "${_dir}")
37 get_filename_component(_dir "${_dir}" ABSOLUTE)
38 file(TO_CMAKE_PATH "${_dir}" _dir)
39 list(APPEND _out "${_dir}")
40 endif()
41 endforeach()
42
43 if(_out)
44 # Clean up the output list now
45 list(REMOVE_DUPLICATES _out)
46 endif()
47
48 # return _out
49 set(${_var} "${_out}" PARENT_SCOPE)
50 endif()
51endfunction()