[xproperty] Add new port (#6316)

ports/xproperty/CONTROL

@@ -0,0 +1,4 @@
+Source: xproperty
+Version: 0.8.1
+Build-Depends: xtl
+Description: Traitlets-like C++ properties and implementation of the observer pattern

ports/xproperty/fix-target.patch

@@ -0,0 +1,44 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 5dcddc2..9d99227 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -7,7 +7,7 @@
+ ############################################################################
+ 
+ cmake_minimum_required(VERSION 3.1)
+-project(xproperty)
++project(xproperty CXX)
+ 
+ set(XPROPERTY_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/include)
+ 
+@@ -28,7 +28,8 @@ message(STATUS "xproperty v${${PROJECT_NAME}_VERSION}")
+ # Dependencies
+ # ============
+ 
+-find_package(xtl 0.5.3 REQUIRED)
++set(xtl_REQUIRED_VERSION 0.5.3)
++find_package(xtl ${xtl_REQUIRED_VERSION} REQUIRED)
+ message(STATUS "Found xtl: ${xtl_INCLUDE_DIRS}/xtl")
+ 
+ # Build
+diff --git a/xpropertyConfig.cmake.in b/xpropertyConfig.cmake.in
+index 192c04f..38b305a 100644
+--- a/xpropertyConfig.cmake.in
++++ b/xpropertyConfig.cmake.in
+@@ -15,7 +15,12 @@
+ 
+ @PACKAGE_INIT@
+ 
+-set(PN xproperty)
+-set_and_check(${PN}_INCLUDE_DIR "${PACKAGE_PREFIX_DIR}/@CMAKE_INSTALL_INCLUDEDIR@")
+-set(${PN}_LIBRARY "")
+-check_required_components(${PN})
++include(CMakeFindDependencyMacro)
++find_dependency(xtl @xtl_REQUIRED_VERSION@)
++
++if(NOT TARGET @PROJECT_NAME@)
++    include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")
++    get_target_property(@PROJECT_NAME@_INCLUDE_DIR @PROJECT_NAME@ INTERFACE_INCLUDE_DIRECTORIES)
++endif()
++
++set(@PROJECT_NAME@_LIBRARY "")

ports/xproperty/portfile.cmake

@@ -0,0 +1,30 @@
+# header-only library
+
+include(vcpkg_common_functions)
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO QuantStack/xproperty
+    REF 0.8.1
+    SHA512 70fcce3a3cc84be98d844aa59c14686945907db3c8fa1c9a916f0bab811ef96512464031e53f00d29cba7db750a0032f4b59d6ca524f52bc7cfe8de5cebad5e5
+    HEAD_REF master
+    PATCHES
+        fix-target.patch
+)
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    PREFER_NINJA
+    OPTIONS
+        -DBUILD_TESTS=OFF
+        -DDOWNLOAD_GTEST=OFF
+)
+
+vcpkg_install_cmake()
+
+vcpkg_fixup_cmake_targets(CONFIG_PATH lib/cmake/${PORT})
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug ${CURRENT_PACKAGES_DIR}/lib)
+
+# Handle copyright
+configure_file(${SOURCE_PATH}/LICENSE ${CURRENT_PACKAGES_DIR}/share/${PORT}/copyright COPYONLY)