mage 1.8.0 (new formula)

Closes #37042.

Signed-off-by: FX Coudert <fxcoudert@gmail.com>

Formula/mage.rb

@@ -0,0 +1,25 @@
+class Mage < Formula
+  desc "Make/rake-like build tool using Go"
+  homepage "https://magefile.org"
+  url "https://github.com/magefile/mage.git",
+      :tag      => "v1.8.0",
+      :revision => "aedfce64c122eef47009b7f80c9771044753215d"
+  sha256 "e8fdfa30f68c8a90fcadd4e82f49c9136011accabff55e073ea26f5ee4280cf0"
+
+  depends_on "go"
+
+  def install
+    ENV["GOPATH"] = buildpath
+    (buildpath/"src/github.com/magefile/mage").install buildpath.children
+    cd "src/github.com/magefile/mage" do
+      system "go", "run", "bootstrap.go"
+      bin.install buildpath/"bin/mage"
+      prefix.install_metafiles
+    end
+  end
+
+  test do
+    assert_match "magefile.go created", shell_output("#{bin}/mage -init 2>&1")
+    assert_predicate testpath/"magefile.go", :exist?
+  end
+end