support rdbg -n --attach

* Attach with `-n` option doesn't stop the debuggee process.
* Introduce `parse_option` method for an extensible greeting message.
* Show the debuggee information at connecting.

Author: ko1

lib/debug/client.rb

@@ -121,7 +121,10 @@ def initialize argv
       @width = IO.console_size[1]
       @width = 80 if @width == 0
 
-      send "version: #{VERSION} width: #{@width} cookie: #{CONFIG[:cookie]}"
+      send "version: #{VERSION} " +
+           "width: #{@width} " +
+           "cookie: #{CONFIG[:cookie] || '-'} " +
+           "nonstop: #{CONFIG[:nonstop] ? 'true' : 'false'}"
     end
 
     def deactivate

lib/debug/server.rb

@@ -107,6 +107,24 @@ def check_cookie c
       end
     end
 
+    def parse_option params
+      case params.strip
+      when /width:\s+(\d+)/
+        @width = $1.to_i
+        parse_option $~.post_match
+      when /cookie:\s+(\S+)/
+        check_cookie $1 if $1 != '-'
+        parse_option $~.post_match
+      when /nonstop: (true|false)/
+        @need_pause_at_first = false if $1 == 'true'
+        parse_option $~.post_match
+      when /(.+):(.+)/
+        raise GreetingError, "Unkown option: #{params}"
+      else
+        # OK
+      end
+    end
+
     def greeting
       case g = @sock.gets
       when /^info cookie:\s+(.*)$/
@@ -117,16 +135,18 @@ def greeting
         @sock.close
         raise GreetingError, "HEAD request"
 
-      when /^version:\s+(.+)\s+width: (\d+) cookie:\s+(.*)$/
-        v, w, c = $1, $2, $3
+      when /^version:\s+(\S+)\s+(.+)$/
+        v, params = $1, $2
+
         # TODO: protocol version
         if v != VERSION
           raise GreetingError, "Incompatible version (server:#{VERSION} and client:#{$1})"
         end
+        parse_option(params)
 
-        check_cookie c
-
-        @width = w.to_i
+        puts "DEBUGGER (client): Connected. PID:#{Process.pid}, $0:#{$0}"
+        puts "DEBUGGER (client): Type `Ctrl-C` to enter the debug console." unless @need_pause_at_first
+        puts
 
       when /^Content-Length: (\d+)/
         require_relative 'server_dap'
@@ -136,6 +156,7 @@ def greeting
         @repl = false
         @need_pause_at_first = false
         dap_setup @sock.read($1.to_i)
+
       when /^GET \/.* HTTP\/1.1/
         require_relative 'server_cdp'