[simpleini] Add package (#1971)

* [simpleini] Add package

* [simpleini] Add `convertutf` dependency

* [simpleini] Add `convert` config

* [simpleini] Tweaks

packages/s/simpleini/xmake.lua

@@ -0,0 +1,45 @@
+package("simpleini")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/brofield/simpleini")
+    set_description("Cross-platform C++ library providing a simple API to read and write INI-style configuration files.")
+    set_license("MIT")
+
+    set_urls("https://github.com/brofield/simpleini/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/brofield/simpleini.git")
+    add_versions("v4.19", "dc10df3fa363be2c57627d52cbb1b5ddd0689d474bf13908e822c1522df8377e")
+
+    add_configs("convert", {description = "Unicode converter to use.", type = "string", values = {"none", "generic", "icu", "win32"}})
+
+    on_load(function (package)
+        if package:config("convert") == nil then
+            if package:is_plat("windows") then
+                package:config_set("convert", "win32")
+            else
+                package:config_set("convert", "generic")
+            end
+        end
+        if package:config("convert") == "none" then
+            package:add("define", "SI_NO_CONVERSION")
+        elseif package:config("convert") == "generic" then
+            package:add("define", "SI_CONVERT_GENERIC")
+            package:add("deps", "convertutf")
+        elseif package:config("convert") == "icu" then
+            package:add("define", "SI_CONVERT_ICU")
+            package:add("deps", "icu4c")
+        elseif package:config("convert") == "win32" then
+            package:add("define", "SI_CONVERT_WIN32")
+        end
+    end)
+
+    on_install(function (package)
+        os.cp("SimpleIni.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            void test() {
+                CSimpleIniA ini;
+                ini.SetUnicode();
+            }
+        ]]}, {configs = {languages = "c++11"}, includes = "SimpleIni.h"}))
+    end)