Add config CLI command

middleman-cli/lib/middleman-cli.rb

@@ -31,3 +31,4 @@ require 'middleman-cli/extension'
 require 'middleman-cli/server'
 require 'middleman-cli/build'
 require 'middleman-cli/console'
+require 'middleman-cli/config'

middleman-cli/lib/middleman-cli/config.rb

@@ -0,0 +1,33 @@
+# CLI Module
+module Middleman::Cli
+  # The CLI Config class
+  class Config < Thor::Group
+    include Thor::Actions
+
+    check_unknown_options!
+
+    class_option :environment,
+                 aliases: '-e',
+                 default: ENV['MM_ENV'] || ENV['RACK_ENV'] || 'development',
+                 desc: 'The environment Middleman will run under'
+    def console
+      require 'json'
+      require 'middleman-core'
+
+      opts = {
+        environment: options['environment']
+      }
+
+      app = ::Middleman::Application.new do
+        config[:environment] = opts[:environment].to_sym if opts[:environment]
+      end
+
+      puts JSON.pretty_generate(app.config.to_h)
+
+      app.shutdown!
+    end
+
+    # Add to CLI
+    Base.register(self, 'config', 'config [options]', 'Output a Middleman configuration in JSON format')
+  end
+end

middleman-core/lib/middleman-core/extensions/asset_hash.rb

@@ -1,5 +1,6 @@
 require 'addressable/uri'
 require 'middleman-core/util'
+require 'middleman-core/rack'
 
 class Middleman::Extensions::AssetHash < ::Middleman::Extension
   option :exts, %w(.jpg .jpeg .png .gif .webp .js .css .otf .woff .woff2 .eot .ttf .svg), 'List of extensions that get asset hashes appended to them.'