meson-internal 0.45.1 (new formula)

keg_only formula, to be used by all formulas that use meson/ninja as
build system.

Formula/meson-internal.rb

@@ -0,0 +1,46 @@
+class MesonInternal < Formula
+  include Language::Python::Virtualenv
+  desc "Fast and user friendly build system"
+  homepage "http://mesonbuild.com/"
+  url "https://github.com/mesonbuild/meson/releases/download/0.45.1/meson-0.45.1.tar.gz"
+  sha256 "4d0bb0dbb1bb556cb7a4092fdfea3d6e76606bd739a4bc97481c2d7bc6200afb"
+  head "https://github.com/mesonbuild/meson.git"
+
+  keg_only <<~EOS
+    this formula contains a heavily patched version of the meson build system and
+    is exclusively used internally by other formulae.
+    Users are advised to run `brew install meson` to install
+    the official meson build
+  EOS
+
+  depends_on "ninja"
+  depends_on "python"
+
+  # see https://github.com/mesonbuild/meson/pull/2577
+  patch do
+    url "https://raw.githubusercontent.com/Homebrew/formula-patches/a20d7df94112f93ea81f72ff3eacaa2d7e681053/meson-internal/meson-osx.patch?full_index=1"
+    sha256 "d8545f5ffbb4dcc58131f35a9a97188ecb522c6951574c616d0ad07495d68895"
+  end
+
+  def install
+    virtualenv_install_with_resources
+  end
+
+  test do
+    (testpath/"helloworld.c").write <<~EOS
+      main() {
+        puts("hi");
+        return 0;
+      }
+    EOS
+    (testpath/"meson.build").write <<~EOS
+      project('hello', 'c')
+      executable('hello', 'helloworld.c')
+    EOS
+
+    mkdir testpath/"build" do
+      system "#{bin}/meson", ".."
+      assert_predicate testpath/"build/build.ninja", :exist?
+    end
+  end
+end