Add --query option to the client so that it can determine if the server can be contacted

client.d

@@ -43,13 +43,14 @@ int main(string[] args)
 	bool clearCache;
 	bool symbolLocation;
 	bool doc;
+	bool query;
 
 	try
 	{
 		getopt(args, "cursorPos|c", &cursorPos, "I", &importPaths,
 			"port|p", &port, "help|h", &help, "shutdown", &shutdown,
 			"clearCache", &clearCache, "symbolLocation|l", &symbolLocation,
-			"doc|d", &doc);
+			"doc|d", &doc, "query|q", &query);
 	}
 	catch (Exception e)
 	{
@@ -64,6 +65,31 @@ int main(string[] args)
 		printHelp(args[0]);
 		return 0;
 	}
+	else if (query)
+	{
+		try
+		{
+			TcpSocket socket = createSocket(port);
+			scope (exit) { socket.shutdown(SocketShutdown.BOTH); socket.close(); }
+			request.kind = RequestKind.query;
+			if (sendRequest(socket, request))
+			{
+				AutocompleteResponse response = getResponse(socket);
+				if (response.completionType == "ack")
+				{
+					writeln("Server is running");
+					return 0;
+				}
+				else
+					throw new Exception("");
+			}
+		}
+		catch (Exception ex)
+		{
+			writeln("Server is not running");
+			return 1;
+		}
+	}
 	else if (shutdown || clearCache)
 	{
 		if (shutdown)
@@ -185,6 +211,10 @@ Options:
         Gets documentation comments associated with the symbol at the cursor
         location.
 
+    --query | -q
+        Query the server statis. Returns 0 if the server is running. Returns
+        1 if the server could not be contacted.
+
     -IPATH
         Instructs the server to add PATH to its list of paths searced for
         imported modules.

man1/dcd-client.1

@@ -1,4 +1,4 @@
-.TH dcd-client 1 "March 6 2014" "" https://github.com/Hackerpilot/DCD
+.TH dcd-client 1 "August 11 2014" "" https://github.com/Hackerpilot/DCD
 .SH NAME
 dcd-client \- autocompletion client for the D programming language
 .PD
@@ -10,6 +10,7 @@ dcd-client \- autocompletion client for the D programming language
 .OP "\-h, \-\-help"
 .OP "\-l, \-\-symbolLocation"
 .OP "\-d, \-\-doc"
+.OP "\-q, \-\-query"
 .OP "\-\-shutdown"
 .OP "\-\-clearCache"
 .RI [ filename ]
@@ -20,6 +21,12 @@ dcd-client \- autocompletion client for the D programming language
 editor scripts.
 .PD
 .SH OPTIONS
+.B \-c, \-\-cursorPos
+.I cursorPosition
+.RS
+Provides auto-completion at the given cursor position. The cursor
+position is measured in bytes from the beginning of the source code.
+.RE
 .B -p, \-\-port
 .I portNumber
 .RS
@@ -27,10 +34,6 @@ Choose the port number on which
 .B dcd-client
 listens.
 .RE
-.B -h, \-\-help
-.RS
-Prints a help message
-.RE
 .B \-I
 .I directory
 .RS
@@ -42,11 +45,22 @@ so that they will be included in responses to future
 .B dcd-client
 requests.
 .RE
-.B \-c, \-\-cursorPos
-.I cursorPosition
+.B -h, \-\-help
 .RS
-Provides auto-completion at the given cursor position. The cursor
-position is measured in bytes from the beginning of the source code.
+Prints a help message
+.RE
+.B -l, \-\-symbolLocation
+.RS
+Get the file name and position that the symbol at the cursor location was defined.
+.RE
+.B \-d, \-\-doc
+.RS
+Gets documentation comments associated with the symbol at the cursor location.
+.RE
+.B \-q, \-\-query
+.RS
+Query the server statis. Returns 0 if the server is running. Returns 1 if the
+server could not be contacted.
 .RE
 .B \-\-shutdown
 .RS

messages.d

@@ -124,6 +124,8 @@ enum RequestKind : ubyte
 	symbolLocation = 0b00010000,
 	/// Get the doc comments for the symbol
 	doc =            0b00100000,
+	/// Query server status
+	query =          0b01000000,
 }
 
 /**

server.d

@@ -155,6 +155,13 @@ int main(string[] args)
 			Log.info("Shutting down.");
 			break serverLoop;
 		}
+		else if (request.kind & RequestKind.query)
+		{
+			AutocompleteResponse response;
+			response.completionType = "ack";
+			ubyte[] responseBytes = msgpack.pack(response);
+			s.send(responseBytes);
+		}
 		if (request.kind & RequestKind.addImport)
 			ModuleCache.addImportPaths(request.importPaths);
 		if (request.kind & RequestKind.autocomplete)
@@ -191,8 +198,6 @@ int main(string[] args)
 				Log.error("Could not get symbol location", e.msg);
 			}
 		}
-		else
-			Log.error("Unknown request type");
 		Log.info("Request processed in ", requestWatch.peek().to!("msecs", float), " milliseconds");
 	}
 	return 0;