add uni_algo (#1879)

* add uni_algo

* improve uni_algo

packages/u/uni_algo/xmake.lua

@@ -0,0 +1,36 @@
+package("uni_algo")
+
+    set_homepage("https://github.com/uni-algo/uni-algo/")
+    set_description("Unicode Algorithms Implementation for C/C++")
+    set_license("MIT")
+
+    add_urls("https://github.com/uni-algo/uni-algo/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/uni-algo/uni-algo.git")
+    add_versions("v0.7.1", "9ff1f03d6ffd81df7a2a21df353502db55d198a940da0aef0546b37ca934fdfb")
+
+    add_configs("header_only", {description = "Use header only version.", default = false, type = "boolean"})
+
+    add_deps("cmake")
+
+    on_install(function (package)
+        if package:config("header_only") then
+            os.cp("include", package:installdir())
+            package:add("defines", "UNI_ALGO_STATIC_DATA")
+        else
+            local configs = {"-DDOWNLOAD_UNICODE_TEST_FILES=OFF"}
+            table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:debug() and "Debug" or "Release"))
+            table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+            import("package.tools.cmake").install(package, configs)
+        end
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            #include "uni_algo/conv.h"
+
+            void test() {
+                std::string str8 = una::utf16to8(u"Te\xD800st");
+                assert(str8 == "Te\xEF\xBF\xBDst");
+            }
+        ]]}, {configs = {languages = "c++17"}}))
+    end)