dhcp: wrap main routine in class

scripts/dhcp

@@ -37,12 +37,35 @@ GLOBAL_OPTIONS = OptionParser.new do |opts|
 Available subcommands:
 add [options] NAME MACADDRESS: add dhcp lease
 remove [options] NAME:         remove dhcp static lease
+regenerate:                    regenerate dhcp configuration
 
 See 'dhcp COMMAND --help' for more information on a specific command.
 HELP
 end
 
-def add_command(registry, args)
+class Application
+  def run(args)
+    GLOBAL_OPTIONS.order!(args)
+    @registry = DhcpRegistry.new
+    case command = args.shift
+    when "add"
+      add_command
+    when "remove"
+      remove_command
+    when nil
+      puts(GLOBAL_OPTIONS.help())
+      exit(0)
+    when "regenerate" # fall through
+    else
+      die "unknown subcommand #{command}"
+    end
+
+    registry.save
+    registry.update_leases
+  end
+
+  private
+    def add_command(args)
       ipv4, ipv6 = nil, nil
       parser = OptionParser.new do |opts|
         opts.banner = "Usage: dhcp add [options] NAME MACADDRESS"
@@ -52,37 +75,25 @@ def add_command(registry, args)
         opts.on("-6", "--ipv6 ADDRESS", "set fixed ipv6 address") do |address|
           ipv6 = address
         end
-  end.order!
+      end.order!(args)
       if ARGV.size < 2
         $stderr.puts "no enough arguments"
         die(parser.help)
       end
       name, macaddress = args
-  registry.add_lease(name, macaddress, ipv4, ipv6)
+      @registry.add_lease(name, macaddress, ipv4, ipv6)
-end
+    end
 
-def remove_command(registry, args)
+    def remove_command(args)
       parser = OptionParser.new do |opts|
         opts.banner = "Usage: dhcp remove NAME"
-  end.order!
+      end.order!(args)
       if args.empty?
         $stderr.puts "no enough arguments"
         die(parser.help)
       end
-  registry.remove_lease(args.first)
+      @registry.remove_lease(args.first)
+    end
 end
 
-GLOBAL_OPTIONS.order!
+Application.new.run(ARGV)
-registry = DhcpRegistry.new
-case command = ARGV.shift
-when "add"
-  add_command(registry, ARGV)
-when "remove"
-  remove_command(registry, ARGV)
-when nil # just update
-else
-  die "unknown subcommand #{command}"
-end
-
-registry.save
-registry.update_leases