add pocketpy (#1871)

* add pocketpy

* improve pocketpy

packages/p/pocketpy/xmake.lua

@@ -0,0 +1,27 @@
+package("pocketpy")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/blueloveTH/pocketpy")
+    set_description("C++17 header-only Python interpreter for game engines.")
+    set_license("MIT")
+
+    add_urls("https://github.com/blueloveTH/pocketpy/releases/download/$(version)/pocketpy.h")
+
+    add_versions("v0.9.0", "0da63afb3ea4ebb8b686bfe33b4c7556c0a927cd98ccf3c7a3fb4aa216fbf30b")
+
+    on_install("windows|x64", "linux", "macosx", "android", function (package)
+        os.cp("../pocketpy.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            void test() {
+                VM* vm = pkpy_new_vm(true);
+                pkpy_vm_exec(vm, "print('Hello world!')");
+                pkpy_vm_exec(vm, "a = [1, 2, 3]");
+                char* result = pkpy_vm_eval(vm, "sum(a)");
+                printf("%s", result);
+                pkpy_delete(result);
+                pkpy_delete(vm);
+            }
+        ]]}, {configs = {languages = "c++17"}, includes = {"pocketpy.h"}}))
+    end)