cling 0.5 (new formula)

Closes #18124.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

Formula/cling.rb

@@ -0,0 +1,39 @@
+class Cling < Formula
+  desc "The cling C++ interpreter"
+  homepage "https://root.cern.ch/cling"
+  url "http://root.cern.ch/git/cling.git",
+      :tag => "v0.5",
+      :revision => "0f1d6d24d4417fc02b73589c8b1d813e92de1c3f"
+
+  depends_on "cmake" => :build
+
+  resource "clang" do
+    url "http://root.cern.ch/git/clang.git",
+        :tag => "cling-patches-r302975",
+        :revision => "1f8b137c7eb06ed8e321649ef7e3f3e7a96f361c"
+  end
+
+  resource "llvm" do
+    url "http://root.cern.ch/git/llvm.git",
+        :tag => "cling-patches-r302975",
+        :revision => "2a34248cb945d63ded5ee55128e68efd7e5b87c8"
+  end
+
+  def install
+    (buildpath/"src").install resource("llvm")
+    (buildpath/"src/tools/cling").install buildpath.children - [buildpath/"src"]
+    (buildpath/"src/tools/clang").install resource("clang")
+    mkdir "build" do
+      system "cmake", *std_cmake_args, "../src"
+      system "make", "install"
+    end
+    prefix.install_metafiles buildpath/"src/tools/cling"
+  end
+
+  test do
+    test = <<~EOS
+      '#include <stdio.h>' 'printf("Hello!")'
+    EOS
+    assert_equal "Hello!(int) 6", shell_output("#{bin}/cling #{test}").chomp
+  end
+end