Add Message#cmd_sym as a convenience method

lib/btc_wire_proto.rb

@@ -398,6 +398,11 @@ module BtcWireProto
     uint32 :payload_len
     uint32 :checksum, :onlyif => :has_checksum?
     
+    def cmd_sym
+      c = command.strip
+      c == "" ? nil : c.to_sym
+    end
+    
     protected
     
     # version and verack messages don't have a checksum. The rest do.
@@ -421,6 +426,10 @@ module BtcWireProto
 
     message_hdr :header
     
+    def cmd_sym
+      header ? header.cmd_sym : nil
+    end
+    
     choice :payload, :selection => :payload_choice do
       version         "version"
       addr_pre31402   "addr_pre31402"

spec/btc_wire_proto_spec.rb

@@ -235,6 +235,11 @@ describe ::BtcWireProto do
         m.payload.selection.should == "version"
       end
       
+      it "should have a :version command symbol" do
+        m = Message::new(:header => {:command => 'version'})
+        m.cmd_sym.should == :version      
+      end
+      
       it "should parse binary data correctly" do
         m = Message::read(binary(%w{
           F9 BE B4 D9 76 65 72 73 69 6F 6E 00 00 00 00 00 55 00 00
@@ -265,6 +270,11 @@ describe ::BtcWireProto do
         m = Message.new(:header => {:command => "verack"})
         m.payload.selection.should == "null"
       end
+      
+      it "should have a :verack command symbol" do
+        m = Message.new(:header => {:command => "verack"})
+        m.cmd_sym.should == :verack
+      end
 
       it "should parse the binary data correctly" do
         m = Message::read(binary(%w{