Add robotstxt (#779)

packages/r/robotstxt/xmake.lua

@@ -0,0 +1,37 @@
+package("robotstxt")
+
+    set_homepage("https://github.com/google/robotstxt")
+    set_description("The repository contains Google's robots.txt parser and matcher as a C++ librar.")
+    set_license("Apache-2.0")
+
+    add_urls("https://github.com/google/robotstxt.git")
+    add_versions("2021.11.24", "02bc6cdfa32db50d42563180c42aeb47042b4f0c")
+
+    add_deps("abseil")
+
+    on_install("macosx", "linux", "windows", function (package)
+        io.writefile("xmake.lua", [[
+            add_rules("mode.debug", "mode.release")
+            add_requires("abseil")
+            target("librobotstxt")
+                set_kind("$(kind)")
+                add_files("robots.cc")
+                add_packages("abseil")
+                add_headerfiles("robots.h")
+                set_languages("c99", "c++17")
+                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, {buildir = "xmake_build"})
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            void test() {
+                googlebot::RobotsMatcher matcher;
+                std::vector<std::string> user_agents(1, "Chrome");
+                bool allowed = matcher.AllowedByRobots("robots_content", &user_agents, "url");
+            }
+        ]]}, {configs = {languages = "c++17"}, includes = "robots.h"}))
+    end)