gz-cmake4: new formula for ionic (#2450)

Signed-off-by: Addisu Z. Taddese <[email protected]>
Co-authored-by: Steve Peters <[email protected]>

Formula/gz-cmake4.rb

@@ -0,0 +1,44 @@
+class GzCmake4 < Formula
+  desc "CMake helper functions for building robotic applications"
+  homepage "https://gazebosim.org"
+  url "https://github.com/gazebosim/gz-cmake.git", branch: "main"
+  version "3.999.999-0-20231006"
+  license "Apache-2.0"
+
+  head "https://github.com/gazebosim/gz-cmake.git", branch: "gz-cmake4"
+
+  depends_on "cmake"
+  depends_on "pkg-config"
+
+  def install
+    cmake_args = std_cmake_args
+    cmake_args << "-DBUILD_TESTING=OFF"
+
+    # Use build folder
+    mkdir "build" do
+      system "cmake", "..", *cmake_args
+      system "make", "install"
+    end
+  end
+
+  test do
+    (testpath/"CMakeLists.txt").write <<-EOS
+      cmake_minimum_required(VERSION 3.5.1 FATAL_ERROR)
+      project(gz-test VERSION 0.1.0)
+      find_package(gz-cmake4 REQUIRED)
+      gz_configure_project()
+      gz_configure_build(QUIT_IF_BUILD_ERRORS)
+    EOS
+    %w[doc include src test].each do |dir|
+      mkdir dir do
+        touch "CMakeLists.txt"
+      end
+    end
+    mkdir "build" do
+      system "cmake", ".."
+    end
+    # check for Xcode frameworks in bottle
+    cmd_not_grep_xcode = "! grep -rnI 'Applications[/]Xcode' #{prefix}"
+    system cmd_not_grep_xcode
+  end
+end