libxml++@4 4.0.0 (new formula)

Formula/libxml++@4.rb

@@ -0,0 +1,45 @@
+class LibxmlxxAT4 < Formula
+  desc "C++ wrapper for libxml"
+  homepage "https://libxmlplusplus.sourceforge.io/"
+  url "https://download.gnome.org/sources/libxml++/4.0/libxml++-4.0.0.tar.xz"
+  sha256 "4f26b5fdb9ebd91e440d60343ac82400f88287facedc7e81b95f23d002f8049f"
+  license "LGPL-2.1-or-later"
+
+  livecheck do
+    url :stable
+  end
+
+  depends_on "meson" => :build
+  depends_on "ninja" => :build
+  depends_on "pkg-config" => [:build, :test]
+  depends_on "glibmm"
+
+  uses_from_macos "libxml2"
+
+  def install
+    ENV.cxx11
+    mkdir "build" do
+      system "meson", *std_meson_args, ".."
+      system "ninja"
+      system "ninja", "install"
+    end
+  end
+
+  test do
+    (testpath/"test.cpp").write <<~EOS
+      #include <libxml++/libxml++.h>
+
+      int main(int argc, char *argv[])
+      {
+         xmlpp::Document document;
+         document.set_internal_subset("homebrew", "", "https://www.brew.sh/xml/test.dtd");
+         xmlpp::Element *rootnode = document.create_root_node("homebrew");
+         return 0;
+      }
+    EOS
+    command = "#{Formula["pkg-config"].opt_bin}/pkg-config --cflags --libs libxml++-4.0"
+    flags = shell_output(command).strip.split
+    system ENV.cxx, "-std=c++17", "test.cpp", "-o", "test", *flags
+    system "./test"
+  end
+end