pugixml 1.6 (new formula)

Closes Homebrew/homebrew#42285.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/pugixml.rb

@@ -0,0 +1,61 @@
+class Pugixml < Formula
+  desc "Pugixml is a light-weight C++ XML processing library"
+  homepage "http://pugixml.org"
+  url "https://github.com/zeux/pugixml/releases/download/v1.6/pugixml-1.6.tar.gz"
+  sha256 "473705c496d45ee6a74f73622b175dfb5dde0de372c4dc61a5acb964516cd9de"
+
+  option "with-shared", "Build shared instead of static library"
+
+  depends_on "cmake" => :build
+
+  def install
+    shared = (build.with? "shared") ? "ON" : "OFF"
+
+    args = std_cmake_args
+    args << "-DBUILD_SHARED_LIBS=#{shared}"
+
+    cd "scripts" do
+      system "cmake", ".", *args
+      system "make", "install"
+    end
+
+    (lib/"pkgconfig/pugixml.pc").write pc_file
+  end
+
+  def pc_file; <<-EOS.undent
+    prefix=#{HOMEBREW_PREFIX}
+    exec_prefix=${prefix}
+    libdir=${exec_prefix}/lib
+    includedir=${exec_prefix}/include
+
+    Name: pugixml
+    Description: Pugixml is a light-weight C++ XML processing library
+    Version: 1.6
+    Libs: -L${libdir} -lpugixml
+    Cflags: -I${includedir}
+    EOS
+  end
+
+  test do
+    (testpath/"test.cpp").write <<-EOS.undent
+      #include <pugixml.hpp>
+      #include <cassert>
+      #include <cstring>
+
+      int main(int argc, char *argv[]) {
+        pugi::xml_document doc;
+        pugi::xml_parse_result result = doc.load_file("test.xml");
+
+        assert(result);
+        assert(strcmp(doc.child_value("root"), "Hello world!") == 0);
+      }
+    EOS
+
+    (testpath/"test.xml").write <<-EOS.undent
+      <root>Hello world!</root>
+    EOS
+
+    system ENV.cc, "test.cpp", "-L#{lib}", "-lpugixml", "-lstdc++", "-o", "test"
+    system "./test"
+  end
+end