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package org.bukkit.command.defaults;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.Validate;
import org.apache.commons.lang.math.NumberUtils;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.CommandSender;
import org.bukkit.command.ConsoleCommandSender;
import org.bukkit.help.HelpMap;
import org.bukkit.help.HelpTopic;
import org.bukkit.help.HelpTopicComparator;
import org.bukkit.help.IndexHelpTopic;
import org.bukkit.util.ChatPaginator;
import com.google.common.collect.ImmutableList;
public class HelpCommand extends VanillaCommand {
public HelpCommand() {
super("help");
this.description = "Shows the help menu";
this.usageMessage = "/help <pageNumber>\n/help <topic>\n/help <topic> <pageNumber>";
this.setPermission("bukkit.command.help");
}
@Override
public boolean execute(CommandSender sender, String currentAlias, String[] args) {
if (!testPermission(sender)) return true;
String command;
int pageNumber;
int pageHeight;
int pageWidth;
if (args.length == 0) {
command = "";
pageNumber = 1;
} else if (NumberUtils.isDigits(args[args.length - 1])) {
command = StringUtils.join(ArrayUtils.subarray(args, 0, args.length - 1), " ");
try {
pageNumber = NumberUtils.createInteger(args[args.length - 1]);
} catch (NumberFormatException exception) {
pageNumber = 1;
}
if (pageNumber <= 0) {
pageNumber = 1;
}
} else {
command = StringUtils.join(args, " ");
pageNumber = 1;
}
if (sender instanceof ConsoleCommandSender) {
pageHeight = ChatPaginator.UNBOUNDED_PAGE_HEIGHT;
pageWidth = ChatPaginator.UNBOUNDED_PAGE_WIDTH;
} else {
pageHeight = ChatPaginator.CLOSED_CHAT_PAGE_HEIGHT - 1;
pageWidth = ChatPaginator.GUARANTEED_NO_WRAP_CHAT_PAGE_WIDTH;
}
HelpMap helpMap = Bukkit.getServer().getHelpMap();
HelpTopic topic = helpMap.getHelpTopic(command);
if (topic == null) {
topic = helpMap.getHelpTopic("/" + command);
}
if (topic == null) {
topic = findPossibleMatches(command);
}
if (topic == null || !topic.canSee(sender)) {
sender.sendMessage(ChatColor.RED + "No help for " + command);
return true;
}
ChatPaginator.ChatPage page = ChatPaginator.paginate(topic.getFullText(sender), pageNumber, pageWidth, pageHeight);
StringBuilder header = new StringBuilder();
header.append(ChatColor.YELLOW);
header.append("--------- ");
header.append(ChatColor.WHITE);
header.append("Help: ");
header.append(topic.getName());
header.append(" ");
if (page.getTotalPages() > 1) {
header.append("(");
header.append(page.getPageNumber());
header.append("/");
header.append(page.getTotalPages());
header.append(") ");
}
header.append(ChatColor.YELLOW);
for (int i = header.length(); i < ChatPaginator.GUARANTEED_NO_WRAP_CHAT_PAGE_WIDTH; i++) {
header.append("-");
}
sender.sendMessage(header.toString());
sender.sendMessage(page.getLines());
return true;
}
@Override
public boolean matches(String input) {
return input.equalsIgnoreCase("help") || input.equalsIgnoreCase("?");
}
@Override
public List<String> tabComplete(CommandSender sender, String alias, String[] args) {
Validate.notNull(sender, "Sender cannot be null");
Validate.notNull(args, "Arguments cannot be null");
Validate.notNull(alias, "Alias cannot be null");
if (args.length == 1) {
List<String> matchedTopics = new ArrayList<String>();
String searchString = args[0];
for (HelpTopic topic : Bukkit.getServer().getHelpMap().getHelpTopics()) {
String trimmedTopic = topic.getName().startsWith("/") ? topic.getName().substring(1) : topic.getName();
if (trimmedTopic.startsWith(searchString)) {
matchedTopics.add(trimmedTopic);
}
}
return matchedTopics;
}
return ImmutableList.of();
}
protected HelpTopic findPossibleMatches(String searchString) {
int maxDistance = (searchString.length() / 5) + 3;
Set<HelpTopic> possibleMatches = new TreeSet<HelpTopic>(HelpTopicComparator.helpTopicComparatorInstance());
if (searchString.startsWith("/")) {
searchString = searchString.substring(1);
}
for (HelpTopic topic : Bukkit.getServer().getHelpMap().getHelpTopics()) {
String trimmedTopic = topic.getName().startsWith("/") ? topic.getName().substring(1) : topic.getName();
if (trimmedTopic.length() < searchString.length()) {
continue;
}
if (Character.toLowerCase(trimmedTopic.charAt(0)) != Character.toLowerCase(searchString.charAt(0))) {
continue;
}
if (damerauLevenshteinDistance(searchString, trimmedTopic.substring(0, searchString.length())) < maxDistance) {
possibleMatches.add(topic);
}
}
if (possibleMatches.size() > 0) {
return new IndexHelpTopic("Search", null, null, possibleMatches, "Search for: " + searchString);
} else {
return null;
}
}
/**
* Computes the Dameraur-Levenshtein Distance between two strings. Adapted
* from the algorithm at <a href="http://en.wikipedia.org/wiki/Damerau–Levenshtein_distance">Wikipedia: Damerau–Levenshtein distance</a>
*
* @param s1 The first string being compared.
* @param s2 The second string being compared.
* @return The number of substitutions, deletions, insertions, and
* transpositions required to get from s1 to s2.
*/
protected static int damerauLevenshteinDistance(String s1, String s2) {
if (s1 == null && s2 == null) {
return 0;
}
if (s1 != null && s2 == null) {
return s1.length();
}
if (s1 == null && s2 != null) {
return s2.length();
}
int s1Len = s1.length();
int s2Len = s2.length();
int[][] H = new int[s1Len + 2][s2Len + 2];
int INF = s1Len + s2Len;
H[0][0] = INF;
for (int i = 0; i <= s1Len; i++) {
H[i + 1][1] = i;
H[i + 1][0] = INF;
}
for (int j = 0; j <= s2Len; j++) {
H[1][j + 1] = j;
H[0][j + 1] = INF;
}
Map<Character, Integer> sd = new HashMap<Character, Integer>();
for (char Letter : (s1 + s2).toCharArray()) {
if (!sd.containsKey(Letter)) {
sd.put(Letter, 0);
}
}
for (int i = 1; i <= s1Len; i++) {
int DB = 0;
for (int j = 1; j <= s2Len; j++) {
int i1 = sd.get(s2.charAt(j - 1));
int j1 = DB;
if (s1.charAt(i - 1) == s2.charAt(j - 1)) {
H[i + 1][j + 1] = H[i][j];
DB = j;
} else {
H[i + 1][j + 1] = Math.min(H[i][j], Math.min(H[i + 1][j], H[i][j + 1])) + 1;
}
H[i + 1][j + 1] = Math.min(H[i + 1][j + 1], H[i1][j1] + (i - i1 - 1) + 1 + (j - j1 - 1));
}
sd.put(s1.charAt(i - 1), i);
}
return H[s1Len + 1][s2Len + 1];
}
}
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