asdf 0.16.0

asdf v0.16.0 has been released. It is a complete rewrite in Go. Because of the
change of language, the build and install process changes significantly. Overall
the formula is more straightforward now and more in line with the numerous other
Go tools distributed via Homebrew.

Formula/a/asdf.rb

@@ -1,8 +1,8 @@
 class Asdf < Formula
   desc "Extendable version manager with support for Ruby, Node.js, Erlang & more"
   homepage "https://asdf-vm.com/"
-  url "https://github.com/asdf-vm/asdf/archive/refs/tags/v0.15.0.tar.gz"
-  sha256 "d0cafe61d27b5e3fcb53658821bfbf744fd040a8ea28b0e22277e032b8e8f7fe"
+  url "https://github.com/asdf-vm/asdf/archive/refs/tags/v0.16.0.tar.gz"
+  sha256 "e2df22d3943911eec5b2d095d8a89a55cc7da912095d3f806619fd597201b124"
   license "MIT"
   head "https://github.com/asdf-vm/asdf.git", branch: "master"
 
@@ -16,38 +16,17 @@ class Asdf < Formula
     sha256 cellar: :any_skip_relocation, all: "a94dd362ce5c3a818f4fa56607eac3c616a3c1191e9f41480093bda2dc308af4"
   end
 
-  depends_on "autoconf"
-  depends_on "automake"
-  depends_on "coreutils"
-  depends_on "libtool"
-  depends_on "libyaml"
+  depends_on "go" => :build
+
   depends_on "openssl@3"
-  depends_on "readline"
-  depends_on "unixodbc"
 
   def install
-    bash_completion.install "completions/asdf.bash" => "asdf"
-    fish_completion.install "completions/asdf.fish"
-    zsh_completion.install "completions/_asdf"
-    libexec.install Dir["*"]
-
-    bin.write_exec_script libexec/"bin/asdf"
-  end
-
-  def caveats
-    <<~EOS
-      To use asdf, add the following line (or equivalent) to your shell profile
-      e.g. ~/.profile or ~/.zshrc:
-        . #{opt_libexec}/asdf.sh
-      e.g. ~/.config/fish/config.fish
-        source #{opt_libexec}/asdf.fish
-      Restart your terminal for the settings to take effect.
-    EOS
+    system("go", "build", *std_go_args(ldflags: "-s -X main.version=#{version}"), "./cmd/asdf")
+    generate_completions_from_executable(bin/"asdf", "completion")
   end
 
   test do
     assert_match version.to_s, shell_output("#{bin}/asdf version")
-    output = shell_output("#{bin}/asdf plugin-list 2>&1")
-    assert_match "No plugins installed", output
+    assert_match "No plugins installed", shell_output("#{bin}/asdf plugin list 2>&1")
   end
 end