interface99: add package (#4546)

* interface99: add package

* interface99: test against older version

* interface99: improve test

* interface99: use c11 flag

* interface99: test latest version

packages/i/interface99/xmake.lua

@@ -0,0 +1,46 @@
+package("interface99")
+    set_kind("library", { headeronly = true })
+    set_homepage("https://github.com/Hirrolot/interface99")
+    set_description("Full-featured interfaces for C99")
+    set_license("MIT")
+
+    add_urls("https://github.com/Hirrolot/interface99/archive/refs/tags/v$(version).tar.gz",
+        "https://github.com/Hirrolot/interface99.git")
+
+    add_versions("1.0.0", "578c7e60fde4ea1c7fd3515e444c6a2e62a9095dac979516c0046a8ed008e3b2")
+    add_versions("1.0.1", "ddc7cd979cf9c964a4313a5e6bdc87bd8df669142f29c8edb71d2f2f7822d9aa")
+
+    add_deps("metalang99")
+
+    on_install(function(package)
+        os.cp("*.h", package:installdir("include"))
+    end)
+
+    on_test(function(package)
+        assert(package:check_csnippets({test = [[
+            #include <assert.h>
+            #define Shape_IFACE                      \
+                vfunc( int, perim, const VSelf)      \
+                vfunc(void, scale, VSelf, int factor)
+            interface(Shape);
+            typedef struct {
+                int a, b;
+            } Rectangle;
+            int Rectangle_perim(const VSelf) {
+                VSELF(const Rectangle);
+                return (self->a + self->b) * 2;
+            }
+            void Rectangle_scale(VSelf, int factor) {
+                VSELF(Rectangle);
+                self->a *= factor;
+                self->b *= factor;
+            }
+            impl(Shape, Rectangle);
+            void test() {
+                Shape shape = DYN_LIT(Rectangle, Shape, {5, 7});
+                assert(VCALL(shape, perim) == 24);
+                VCALL(shape, scale, 5);
+                assert(VCALL(shape, perim) == 120);
+            }
+        ]]}, { configs = { languages = "c11" }, includes = "interface99.h" }))
+    end)