qtpromise: add package (#2856)

* qtpromise: add package

* fix copy

packages/q/qtpromise/xmake.lua

@@ -0,0 +1,37 @@
+package("qtpromise")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://qtpromise.netlify.com")
+    set_description("Promises/A+ implementation for Qt/C++")
+    set_license("MIT")
+
+    add_urls("https://github.com/simonbrunel/qtpromise/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/simonbrunel/qtpromise.git")
+
+    add_versions("v0.7.0", "dda94ad274f667c6f78f1aa0fcd4fc76190d290703c6c3183c2a8413177abc3f")
+
+    add_deps("qt6core")
+
+    on_install("windows|x64", "linux|x86_64", "macosx|x86_64", "mingw|x86_64", function (package)
+        io.replace("include/QtPromise", "../src/qtpromise/", "", {plain = true})
+        os.cp("include", package:installdir())
+        os.cp("src/qtpromise/*.h", package:installdir("include"))
+        os.cp("src/qtpromise/*.inl", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        local cxflags
+        if package:is_plat("windows") then
+            cxflags = {"/Zc:__cplusplus", "/permissive-"}
+        else
+            cxflags = "-fPIC"
+        end
+        assert(package:check_cxxsnippets({test = [[
+            #include <QtPromise>
+            QtPromise::QPromise<QByteArray> test() {
+                return {[&](
+                    const QtPromise::QPromiseResolve<QByteArray>& resolve,
+                    const QtPromise::QPromiseReject<QByteArray>& reject){}};
+            }
+        ]]}, {configs = {languages = "c++17", cxflags = cxflags}}))
+    end)
+