gdm 1.0 (new formula)

Closes Homebrew/homebrew#46897.

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

Formula/gdm.rb

@@ -0,0 +1,35 @@
+require "language/go"
+
+class Gdm < Formula
+  desc "Go Dependency Manager (gdm)"
+  homepage "https://github.com/sparrc/gdm"
+  url "https://github.com/sparrc/gdm/archive/v1.0.tar.gz"
+  sha256 "e0dbec8deed27af3ff4cb16782bc38a4fd8eeb0db8e024b3083a00d36f877cab"
+
+  depends_on "go"
+
+  go_resource "golang.org/x/tools" do
+    url "https://go.googlesource.com/tools.git",
+    :revision => "b48dc8da98ae78c3d11f220e7d327304c84e623a"
+  end
+
+  def install
+    ENV["GOPATH"] = buildpath
+    mkdir_p buildpath/"src/github.com/sparrc"
+    ln_sf buildpath, buildpath/"src/github.com/sparrc/gdm"
+
+    Language::Go.stage_deps resources, buildpath/"src"
+
+    cd "src/github.com/sparrc/gdm" do
+      system "go", "build", "-o", bin/"gdm",
+             "-ldflags", "-X main.Version=#{version}"
+    end
+  end
+
+  test do
+    ENV["GOPATH"] = testpath
+    assert_match "#{version}", shell_output("#{bin}/gdm version")
+    assert_match "#{testpath}", shell_output("gdm save")
+    system "gdm", "restore"
+  end
+end