im3d: add package (#2432)

packages/i/im3d/xmake.lua

@@ -0,0 +1,33 @@
+package("im3d")
+    set_homepage("https://github.com/john-chapman/im3d")
+    set_description("File Dialog for Dear ImGui")
+    set_license("MIT")
+
+    add_urls("https://github.com/john-chapman/im3d.git")
+
+    add_versions("2023.06.09", "d03941725fd0bd08c78c46e3e5b0265526e9d060")
+
+    on_install(function (package)
+        io.writefile("xmake.lua", [[
+            add_rules("mode.debug", "mode.release")
+            target("im3d")
+                set_kind("$(kind)")
+                set_languages("c++11")
+                add_files("im3d.cpp")
+                add_headerfiles("im3d.h", "im3d_config.h", "im3d_math.h")
+                if is_plat("windows") and is_kind("shared") then
+                    add_rules("utils.symbols.export_all", {export_classes = true})
+                end
+        ]])
+        import("package.tools.xmake").install(package)
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            #include <im3d.h>
+            void test() {
+                Im3d::PushDrawState();
+                Im3d::SetSize(2.0f);
+            }
+        ]]}, {configs = {languages = "c++11"}}))
+    end)