gh 2.1.0 (new formula) - GitHub CLI.

Closes Homebrew/homebrew#28829.

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

Formula/gh.rb

@@ -0,0 +1,31 @@
+require "formula"
+
+class Gh < Formula
+  homepage "https://github.com/jingweno/gh"
+  url "https://github.com/jingweno/gh/archive/v2.1.0.tar.gz"
+  sha1 "0673343542fedd6780bdb1d5a773c45f35a9ab28"
+  head "https://github.com/jingweno/gh.git"
+
+  bottle do
+  end
+
+  depends_on "go" => :build
+
+  option "without-completions", "Disable bash/zsh completions"
+
+  def install
+    system "script/make", "--no-update"
+    bin.install "gh"
+
+    if build.with? "completions"
+      bash_completion.install "etc/gh.bash_completion.sh"
+      zsh_completion.install "etc/gh.zsh_completion" => "_gh"
+    end
+  end
+
+  test do
+    HOMEBREW_REPOSITORY.cd do
+      assert_equal 'bin/brew', `#{bin}/gh ls-files -- bin`.strip
+    end
+  end
+end