create: add --go-mod option

Library/Homebrew/dev-cmd/create.rb

@@ -23,6 +23,8 @@ module Homebrew
              description: "Create a basic template for an Autotools-style build."
       switch "--cmake",
              description: "Create a basic template for a CMake-style build."
+      switch "--go-mod",
+             description: "Create a basic template for a Go-Modules-style build."
       switch "--meson",
              description: "Create a basic template for a Meson-style build."
       switch "--no-fetch",
@@ -40,7 +42,7 @@ module Homebrew
       switch :force
       switch :verbose
       switch :debug
-      conflicts "--autotools", "--cmake", "--meson"
+      conflicts "--autotools", "--cmake", "--go-mod", "--meson"
     end
   end
 
@@ -73,6 +75,8 @@ module Homebrew
       :autotools
     elsif args.meson?
       :meson
+    elsif args.go_mod?
+      :go_mod
     end
 
     if fc.name.nil? || fc.name.strip.empty?

Library/Homebrew/formula_creator.rb

@@ -99,6 +99,8 @@ module Homebrew
 
         <% if  mode == :cmake %>
           depends_on "cmake" => :build
+        <% elsif  mode == :go_mod %>
+          depends_on "go" => :build
         <% elsif  mode == :meson %>
           depends_on "meson" => :build
           depends_on "ninja" => :build
@@ -116,6 +118,8 @@ module Homebrew
                                   "--disable-dependency-tracking",
                                   "--disable-silent-rules",
                                   "--prefix=\#{prefix}"
+        <% elsif  mode == :go_mod %>
+            system "go", "build", "-o", "\#{bin}/\#{name}"
         <% elsif  mode == :meson %>
             mkdir "build" do
               system "meson", "--prefix=\#{prefix}", ".."
@@ -130,7 +134,7 @@ module Homebrew
                                   "--prefix=\#{prefix}"
             # system "cmake", ".", *std_cmake_args
         <% end  %>
-        <% if  mode != :meson %>
+        <% if  mode != :meson and mode != :go_mod %>
             system "make", "install" # if this fails, try separate make/make install steps
         <% end  %>
           end