commands/init: add --output flag [GH-1364]

CHANGELOG.md

@@ -18,6 +18,8 @@ IMPROVEMENTS:
 
   - core: Support resumable downloads [GH-57]
   - core: owner/group of shared folders can be specified by integers. [GH-2390]
+  - commands/init: Add `--output` option for specifing output path, or
+    "-" for stdin. [GH-1364]
   - commands/provision: Add `--no-parallel` option to disable provider
     parallelization if the provider supports it. [GH-2404]
   - commands/ssh: SSH compression is enabled by default. [GH-2456]

plugins/commands/init/command.rb

@@ -10,29 +10,42 @@ module VagrantPlugins
       end
 
       def execute
+        options = { output: "Vagrantfile" }
+
         opts = OptionParser.new do |o|
           o.banner = "Usage: vagrant init [box-name] [box-url]"
+
+          o.on("--output FILENAME", String,
+               "Output path for the box. '-' for stdout.") do |output|
+            options[:output] = output
+          end
         end
 
         # Parse the options
         argv = parse_options(opts)
         return if !argv
 
-        save_path = @env.cwd.join("Vagrantfile")
-        raise Vagrant::Errors::VagrantfileExistsError if save_path.exist?
+        save_path = nil
+        if options[:output] != "-"
+          save_path = Pathname.new(options[:output]).expand_path(@env.cwd)
+          raise Vagrant::Errors::VagrantfileExistsError if save_path.exist?
+        end
 
         template_path = ::Vagrant.source_root.join("templates/commands/init/Vagrantfile")
         contents = Vagrant::Util::TemplateRenderer.render(template_path,
                                                           :box_name => argv[0] || "base",
                                                           :box_url => argv[1])
 
-        # Write out the contents
-        save_path.open("w+") do |f|
-          f.write(contents)
-        end
+        if save_path
+          # Write out the contents
+          save_path.open("w+") do |f|
+            f.write(contents)
+          end
 
-        @env.ui.info(I18n.t("vagrant.commands.init.success"),
-                     :prefix => false)
+          @env.ui.info(I18n.t("vagrant.commands.init.success"), prefix: false)
+        else
+          @env.ui.info(contents, prefix: false)
+        end
 
         # Success, exit status 0
         0