m_spanningtree Rewrite /map

2 files changed, 129 insertions, 109 deletions

diff --git a/src/modules/m_spanningtree/commands.h b/src/modules/m_spanningtree/commands.h
index 97322ed99..0c1ea8e49 100644
--- a/src/modules/m_spanningtree/commands.h
+++ b/src/modules/m_spanningtree/commands.h
@@ -42,14 +42,6 @@ class CommandRSQuit : public Command
 
 class CommandMap : public Command
 {
-	/** Show MAP output to a user (recursive)
-	 */
-	void ShowMap(TreeServer* Current, User* user, int depth, int &line, char* names, int &maxnamew, char* stats);
-
-	/** Returns oper-specific MAP information
-	 */
-	std::string MapOperInfo(TreeServer* Current);
-
  public:
 	CommandMap(Module* Creator);
 	CmdResult Handle(const std::vector<std::string>& parameters, User* user);
diff --git a/src/modules/m_spanningtree/override_map.cpp b/src/modules/m_spanningtree/override_map.cpp
index a9b68eb9b..216fd4d66 100644
--- a/src/modules/m_spanningtree/override_map.cpp
+++ b/src/modules/m_spanningtree/override_map.cpp
@@ -1,6 +1,7 @@
 /*
  * InspIRCd -- Internet Relay Chat Daemon
  *
+ *   Copyright (C) 2014 Adam <Adam@anope.org>
  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
  *   Copyright (C) 2007-2008 Craig Edwards <craigedwards@brainbox.cc>
  *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
@@ -32,75 +33,136 @@ CommandMap::CommandMap(Module* Creator)
 	Penalty = 2;
 }
 
-std::string CommandMap::MapOperInfo(TreeServer* Current)
+static inline bool IsHidden(User* user, TreeServer* server)
 {
-	time_t secs_up = ServerInstance->Time() - Current->age;
-	return " [Up: " + ModuleSpanningTree::TimeToStr(secs_up) + (Current->rtt == 0 ? "]" : " Lag: " + ConvToStr(Current->rtt) + "ms]");
+	if (!user->IsOper())
+	{
+		if (server->Hidden)
+			return true;
+		if (Utils->HideULines && server->IsULine())
+			return true;
+	}
+
+	return false;
 }
 
-void CommandMap::ShowMap(TreeServer* Current, User* user, int depth, int &line, char* names, int &maxnamew, char* stats)
+// Calculate the map depth the servers go, and the longest server name
+static void GetDepthAndLen(TreeServer* current, unsigned int depth, unsigned int& max_depth, unsigned int& max_len)
 {
-	ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "ShowMap depth %d on line %d", depth, line);
-	float percent;
+	if (depth > max_depth)
+		max_depth = depth;
+	if (current->GetName().length() > max_len)
+		max_len = current->GetName().length();
 
-	if (ServerInstance->Users->clientlist->size() == 0)
+	const TreeServer::ChildServers& servers = current->GetChildren();
+	for (TreeServer::ChildServers::const_iterator i = servers.begin(); i != servers.end(); ++i)
+	{
+		TreeServer* child = *i;
+		GetDepthAndLen(child, depth + 1, max_depth, max_len);
+	}
+}
+
+static std::vector<std::string> GetMap(User* user, TreeServer* current, unsigned int max_len, unsigned int depth)
+{
+	float percent = 0;
+
+	if (!ServerInstance->Users->clientlist->empty())
 	{
 		// If there are no users, WHO THE HELL DID THE /MAP?!?!?!
-		percent = 0;
+		percent = current->UserCount * 100.0 / ServerInstance->Users->clientlist->size();
 	}
-	else
+
+	std::string buffer = current->GetName();
+	if (user->IsOper())
 	{
-		percent = Current->UserCount * 100.0 / ServerInstance->Users->clientlist->size();
+		buffer += " (" + current->GetID() + ")";
 	}
 
-	const std::string operdata = user->IsOper() ? MapOperInfo(Current) : "";
+	// Pad with spaces until its at max len, max_len must always be >= my names length
+	buffer.append(max_len - current->GetName().length(), ' ');
 
-	char* myname = names + 100 * line;
-	char* mystat = stats + 50 * line;
-	memset(myname, ' ', depth);
-	int w = depth;
+	char buf[16];
+	snprintf(buf, sizeof(buf), "%5d [%5.2f%%]", current->UserCount, percent);
+	buffer += buf;
 
 	if (user->IsOper())
 	{
-		w += snprintf(myname + depth, 99 - depth, "%s (%s)", Current->GetName().c_str(), Current->GetID().c_str());
-	}
-	else
-	{
-		w += snprintf(myname + depth, 99 - depth, "%s", Current->GetName().c_str());
+		time_t secs_up = ServerInstance->Time() - current->age;
+		buffer += " [Up: " + ModuleSpanningTree::TimeToStr(secs_up) + (current->rtt == 0 ? "]" : " Lag: " + ConvToStr(current->rtt) + "ms]");
 	}
-	memset(myname + w, ' ', 100 - w);
-	if (w > maxnamew)
-		maxnamew = w;
-	snprintf(mystat, 49, "%5d [%5.2f%%]%s", Current->UserCount, percent, operdata.c_str());
-
-	line++;
 
-	if (user->IsOper() || !Utils->FlatLinks)
-		depth = depth + 2;
+	std::vector<std::string> map;
+	map.push_back(buffer);
 
-	const TreeServer::ChildServers& servers = Current->GetChildren();
+	const TreeServer::ChildServers& servers = current->GetChildren();
 	for (TreeServer::ChildServers::const_iterator i = servers.begin(); i != servers.end(); ++i)
 	{
 		TreeServer* child = *i;
-		if (!user->IsOper()) {
-			if (child->Hidden)
-				continue;
-			if ((Utils->HideULines) && (child->IsULine()))
-				continue;
+
+		if (IsHidden(user, child))
+			continue;
+
+		bool last = true;
+		for (TreeServer::ChildServers::const_iterator j = i + 1; last && j != servers.end(); ++j)
+			if (!IsHidden(user, *j))
+				last = false;
+
+		unsigned int next_len;
+
+		if (user->IsOper() || !Utils->FlatLinks)
+		{
+			// This child is indented by us, so remove the depth from the max length to align the users properly
+			next_len = max_len - 2;
+		}
+		else
+		{
+			// This user can not see depth, so max_len remains constant
+			next_len = max_len;
+		}
+
+		// Build the map for this child
+		std::vector<std::string> child_map = GetMap(user, child, next_len, depth + 1);
+
+		for (std::vector<std::string>::const_iterator j = child_map.begin(); j != child_map.end(); ++j)
+		{
+			const char* prefix;
+
+			if (user->IsOper() || !Utils->FlatLinks)
+			{
+				// If this server is not the root child
+				if (j != child_map.begin())
+				{
+					// If this child is not my last child, then add |
+					// to be able to "link" the next server in my list to me, and to indent this childs servers
+					if (!last)
+						prefix = "| ";
+					// Otherwise this is my last child, so just use a space as theres nothing else linked to me below this
+					else
+						prefix = "  ";
+				}
+				// If we get here, this server must be the root child
+				else
+				{
+					// If this is the last child, it gets a `-
+					if (last)
+						prefix = "`-";
+					// Otherwise this isn't the last child, so it gets |-
+					else
+						prefix = "|-";
+				}
+			}
+			else
+				// User can't see depth, so use no prefix
+				prefix = "";
+
+			// Add line to the map
+			map.push_back(prefix + *j);
 		}
-		ShowMap(child, user, depth, line, names, maxnamew, stats);
 	}
-}
 
+	return map;
+}
 
-// Ok, prepare to be confused.
-// After much mulling over how to approach this, it struck me that
-// the 'usual' way of doing a /MAP isnt the best way. Instead of
-// keeping track of a ton of ascii characters, and line by line
-// under recursion working out where to place them using multiplications
-// and divisons, we instead render the map onto a backplane of characters
-// (a character matrix), then draw the branches as a series of "L" shapes
-// from the nodes. This is not only friendlier on CPU it uses less stack.
 CmdResult CommandMap::Handle(const std::vector<std::string>& parameters, User* user)
 {
 	if (parameters.size() > 0)
@@ -117,71 +179,37 @@ CmdResult CommandMap::Handle(const std::vector<std::string>& parameters, User* u
 			return CMD_SUCCESS;
 	}
 
-	// These arrays represent a virtual screen which we will
-	// "scratch" draw to, as the console device of an irc
-	// client does not provide for a proper terminal.
-	int totusers = ServerInstance->Users->clientlist->size();
-	int totservers = Utils->serverlist.size();
-	int maxnamew = 0;
-	int line = 0;
-	char* names = new char[totservers * 100];
-	char* stats = new char[totservers * 50];
-
-	// The only recursive bit is called here.
-	ShowMap(Utils->TreeRoot,user,0,line,names,maxnamew,stats);
-
-	// Process each line one by one.
-	for (int l = 1; l < line; l++)
-	{
-		char* myname = names + 100 * l;
-		// scan across the line looking for the start of the
-		// servername (the recursive part of the algorithm has placed
-		// the servers at indented positions depending on what they
-		// are related to)
-		int first_nonspace = 0;
-
-		while (myname[first_nonspace] == ' ')
-		{
-			first_nonspace++;
-		}
-
-		first_nonspace--;
-
-		// Draw the `- (corner) section: this may be overwritten by
-		// another L shape passing along the same vertical pane, becoming
-		// a |- (branch) section instead.
+	// Max depth and max server name length
+	unsigned int max_depth = 0;
+	unsigned int max_len = 0;
+	GetDepthAndLen(Utils->TreeRoot, 0, max_depth, max_len);
 
-		myname[first_nonspace] = '-';
-		myname[first_nonspace-1] = '`';
-		int l2 = l - 1;
-
-		// Draw upwards until we hit the parent server, causing possibly
-		// other corners (`-) to become branches (|-)
-		while ((names[l2 * 100 + first_nonspace-1] == ' ') || (names[l2 * 100 + first_nonspace-1] == '`'))
-		{
-			names[l2 * 100 + first_nonspace-1] = '|';
-			l2--;
-		}
+	unsigned int max;
+	if (user->IsOper() || !Utils->FlatLinks)
+	{
+		// Each level of the map is indented by 2 characters, making the max possible line (max_depth * 2) + max_len
+		max = (max_depth * 2) + max_len;
 	}
-
-	float avg_users = totusers * 1.0 / line;
-
-	for (int t = 0; t < line; t++)
+	else
 	{
-		// terminate the string at maxnamew characters
-		names[100 * t + maxnamew] = '\0';
-		user->SendText(":%s %03d %s :%s %s", ServerInstance->Config->ServerName.c_str(),
-			RPL_MAP, user->nick.c_str(), names + 100 * t, stats + 50 * t);
+		// This user can't see any depth
+		max = max_len;
 	}
-	user->SendText(":%s %03d %s :%d server%s and %d user%s, average %.2f users per server",
+
+	std::vector<std::string> map = GetMap(user, Utils->TreeRoot, max, 0);
+	for (std::vector<std::string>::const_iterator i = map.begin(); i != map.end(); ++i)
+		user->SendText(":%s %03d %s :%s", ServerInstance->Config->ServerName.c_str(),
+			RPL_MAP, user->nick.c_str(), i->c_str());
+
+	size_t totusers = ServerInstance->Users->clientlist->size();
+	float avg_users = (float) totusers / Utils->serverlist.size();
+
+	user->SendText(":%s %03d %s :%u server%s and %u user%s, average %.2f users per server",
 		ServerInstance->Config->ServerName.c_str(), RPL_MAPUSERS, user->nick.c_str(),
-		line, (line > 1 ? "s" : ""), totusers, (totusers > 1 ? "s" : ""), avg_users);
+		(unsigned int)Utils->serverlist.size(), (Utils->serverlist.size() > 1 ? "s" : ""), (unsigned int)totusers, (totusers > 1 ? "s" : ""), avg_users);
 	user->SendText(":%s %03d %s :End of /MAP", ServerInstance->Config->ServerName.c_str(),
 		RPL_ENDMAP, user->nick.c_str());
 
-	delete[] names;
-	delete[] stats;
-
 	return CMD_SUCCESS;
 }