Implement message parsing and constructing

.gitignore

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+.dub
+docs.json
+__dummy.html
+*.o
+*.obj
+__test__*__
+ircd

dub.sdl

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+name "ircd"
+description "An Internet Relay Chat server in D"
+authors "Les De Ridder"
+copyright "Copyright © 2017, Les De Ridder"
+license "NCSA"
+dependency "vibe-d" version="~>0.7.30"
+versions "VibeDefaultMain"

dub.selections.json

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+{
+	"fileVersion": 1,
+	"versions": {
+		"diet-ng": "1.2.0",
+		"libasync": "0.7.9",
+		"libevent": "2.0.2+2.0.16",
+		"memutils": "0.4.9",
+		"openssl": "1.1.5+1.0.1g",
+		"vibe-d": "0.7.30"
+	}
+}

source/app.d

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+import vibe.d;
+
+import std.stdio;
+import std.functional;
+import std.array;
+import std.algorithm;
+import std.conv;
+
+shared static this()
+{
+	listenTCP(6667, toDelegate(&handleConnection), "127.0.0.1");
+}
+
+struct Message
+{
+	string prefix;
+	string command;
+	string[] parameters;
+	bool prefixedParameter;
+
+	static Message fromString(string line)
+	{
+		string prefix = null;
+		if(line.startsWith(':'))
+		{
+			line = line[1 .. $];
+			prefix = line[0 .. line.indexOf(' ')];
+			line = line[prefix.length + 1 .. $];
+		}
+
+		auto command = line[0 .. line.indexOf(' ')];
+		line = line[command.length + 1 .. $];
+		string[] params = [];
+		bool prefixedParam;
+		while(true)
+		{
+			if(line.startsWith(':'))
+			{
+				params ~= line[1 .. $];
+				prefixedParam = true;
+				break;
+			}
+			else if(line.canFind(' '))
+			{
+				auto param = line[0 .. line.indexOf(' ')];
+				line = line[param.length + 1 .. $];
+				params ~= param;
+			}
+			else
+			{
+				params ~= line;
+				break;
+			}
+		}
+
+		return Message(prefix, command, params, prefixedParam);
+	}
+
+	string toString()
+	{
+		auto message = "";
+		if(prefix != null)
+		{
+			message = ":" ~ prefix ~ " ";
+		}
+
+		message ~= command ~ " ";
+		if(parameters.length > 1)
+		{
+			message ~= parameters[0 .. $-1].join(' ') ~ " ";
+			if(parameters[$-1].canFind(' ') || prefixedParameter)
+			{
+				message ~= ":";
+			}
+		}
+		message ~= parameters[$-1];
+
+		return message;
+	}
+}
+
+void handleConnection(TCPConnection connection)
+{
+	writeln("connection opened");
+	while(connection.connected)
+	{
+		auto message = Message.fromString((cast(string)connection.readLine()).chomp);
+		writeln("C> " ~ message.toString);
+	}
+	writeln("connection closed");
+}
+
+