exe/hrw in hrw-0.3.6 vs exe/hrw in hrw-0.3.7

@@ -1,20 +1,25 @@
 #!/usr/bin/env ruby
+require 'json'
 require 'ostruct'
 require 'optparse'
 
 require 'hrw'
 
 ARGV << '--help' if ARGV.empty?
 
-options = OpenStruct.new
+options = OpenStruct.new(json: false)
 OptionParser.new do |opt|
   opt.banner = "usage: #{__FILE__} [OPTIONS]"
 
   opt.on('-u', '--url [URL]', 'remote api url') do |url|
     options.url = url
   end
+
+  opt.on('--json', 'output as json') do
+    options.json = true
+  end
 end.parse!
 
 if options.url.nil?
   if ENV.key?(Hrw::ENV)
     options.url = ENV[Hrw::ENV]
@@ -35,10 +40,15 @@
 api = Hrw::API.new(options.url)
 hash = api.submit(specs, scanner.package_manager)
 result = api.retrieve(hash)
 
 formatter = Hrw::Formatter.new
-if formatter.pretty_print(result)
-  exit(1)
+if options.json
+  deps = formatter.filter(result)
+  puts JSON.pretty_generate(deps)
+
+  ret = deps.empty? ? 0 : 1
 else
-  exit(0)
+  ret = formatter.pretty_print(result) ? 1 : 0
 end
+
+exit(ret)