all new list command

src/org/mcteam/ancientgates/commands/CommandList.java

@@ -3,8 +3,10 @@ package org.mcteam.ancientgates.commands;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
 
+import org.bukkit.ChatColor;
 import org.mcteam.ancientgates.Conf;
 import org.mcteam.ancientgates.Gate;
 import org.mcteam.ancientgates.util.TextUtil;
@@ -16,21 +18,33 @@ public class CommandList extends BaseCommand
 		aliases.add("list");
 		aliases.add("ls");
 		
+		optionalParameters.add("page");
 		hasGateParam = false;
 		
 		helpDescription = "Display a list of the gates";
 	}
 	
 	
-	public void perform() 
+	protected String intToTitleString(int i)
+	{
+		if ( i < 26 )
+			return Conf.colorMember + "" + (char)(i+65) + ":";
+		else if ( i == 26 )
+			return Conf.colorMember + "0 - 9:";
+		else
+			return Conf.colorMember + "!@#$:";
+	}
+	
+	
+	
+	// pages start at 1
+	// will return null if requested page not availible
+	protected List<String> message(int page)
 	{
 		Collection<Gate> gates = Gate.getAll();
 		
 		if (gates.size() == 0)
-		{
-			sendMessage("There are no gates yet.");
-			return;
-		} 
+			return null;
 		
 		/* sort all gates by there first character
 		 * put gates in corresponding Lists
@@ -57,35 +71,141 @@ public class CommandList extends BaseCommand
 			else // everything else
 				first = 27;
 			
-			ids.get(first).add(Conf.colorAlly + id);
+			ids.get(first).add(id);
 		}
 		
-		// sort all lists
-		for (List<String> list : ids)
-			Collections.sort(list);
-
 		
-		sendMessage("There are currently " + gates.size() + " gates on this server: ");
+		/* calculating which gates will be displayed on which page.
+		 * this is a little bit fuzzy. but hopefully it will look
+		 * great. (tell me if there is a better way!)
+		 */
 		
-		for (int i=0; i<ids.size(); i++)
+		// list<string>: a list from ids
+		// Integer: the number of lines neccessary for displaying the corresponding list
+		HashMap<List<String>, Integer> lines = new HashMap<List<String>, Integer>(27);
+		
+		for (List<String> currentIds : ids)
 		{
-			List<String> currentIds = ids.get(i);
-			
 			if (currentIds.size() == 0)
 				continue;
 			
-			String head;
-			if ( i < 26 )
-				head = "" + (char)(i+65) + ":";
-			else if ( i == 26 )
-				head = "0 - 9:";
-			else
-				head = "!@#$:";
-			
-			sendMessage(Conf.colorMember + head);
-			sendMessage(TextUtil.implode(currentIds, Conf.colorSystem+", "));
+			int characters = TextUtil.implode(currentIds, ", ").length();
+			lines.put(currentIds, characters / 52 + 2);
 		}
 		
+		
+		int currentPage = 1;
+		int currentStartingCharList = 0;
+		boolean finishedCurrentIds = true;
+		
+		List<String> pageMessages = new ArrayList<String>();
+		
+		while (currentStartingCharList < ids.size())
+		{
+			int linesLeftOnCurrentPage = 9;
+			
+			while (linesLeftOnCurrentPage > 1 && currentStartingCharList < ids.size())
+			{
+				List<String> currentIds = ids.get(currentStartingCharList);
+				
+				if (currentIds.size() > 0)
+				{
+					// add header line
+					if (currentPage == page)
+						pageMessages.add(intToTitleString(currentStartingCharList));
+					
+					//sort
+					Collections.sort(currentIds);
+				
+					// add ids
+					if (lines.get(currentIds) <= linesLeftOnCurrentPage) // all ids fit on current page
+					{
+						linesLeftOnCurrentPage -= lines.get(currentIds);
+						
+						
+						if (currentPage == page)
+							pageMessages.add(TextUtil.implode(currentIds, ", "));
+						if (currentPage == page && finishedCurrentIds == false)
+							pageMessages.set(pageMessages.size() -2, pageMessages.get(pageMessages.size() -2) + " (more on previous page)");
+						
+						finishedCurrentIds = true;
+					}
+					else // NOT all ids fit on current page
+					{
+						int charsAvailible = (linesLeftOnCurrentPage - 1) * 52;
+						int idsPos = 0;
+						
+						while (true)
+						{
+							charsAvailible -= currentIds.get(idsPos).length() + 2;
+							
+							if (charsAvailible <= 0)
+								break;
+							
+							idsPos++;
+						}
+						
+						List<String> idsToPutOnCurrentPage = currentIds.subList(0, idsPos);
+						currentIds.remove(idsToPutOnCurrentPage);
+						
+						String stringToPutOnCurrentPage = TextUtil.implode(idsToPutOnCurrentPage, ", ");
+						
+						if (currentPage == page)
+						{
+							pageMessages.add(stringToPutOnCurrentPage);
+							pageMessages.set(pageMessages.size() -2, pageMessages.get(pageMessages.size() -2) + " (more on next page)");
+						}
+						
+						lines.put(currentIds, TextUtil.implode(currentIds, ", ").length() / 52 + 2);
+						linesLeftOnCurrentPage -= stringToPutOnCurrentPage.length() / 52 + 2;
+						
+						finishedCurrentIds = false;
+					}
+				}
+				
+				if (finishedCurrentIds)
+					currentStartingCharList++;
+			}
+			
+			currentPage++;
+		}
+		
+		if (pageMessages.isEmpty())
+			return null;
+		else
+		{
+			// not nice! TODO: find a better way to send this message!
+			sendMessage(ChatColor.LIGHT_PURPLE + "This is page " + ChatColor.WHITE + page + ChatColor.LIGHT_PURPLE + "/" + ChatColor.WHITE + --currentPage + ChatColor.LIGHT_PURPLE + ". There are " + gates.size() + " gates on this server: ");
+			return pageMessages;
+		}
+	}
+	
+	
+	public void perform() 
+	{
+		Collection<Gate> gates = Gate.getAll();
+		
+		if (gates.size() == 0)
+			sendMessage("There are no gates yet.");
+		else
+		{
+			int page = 1;
+			
+			try
+			{
+				page = new Integer(parameters.get(0));
+			} 
+			catch (Exception e)
+			{
+			}
+			
+			List<String> messages = message(page);
+			
+			if (messages == null)
+				sendMessage("The requested page is not availible");
+			else
+				sendMessage(messages);
+		}
 	}
 }