Added /clean command to clear a user's additions from a channel

Any user with playlistdelete permission can now use the /clean
command to wipe out a user's additions to the playlist.  This
can be helpful for taking down abusive items en masse without
resetting the entire playlist.

The code should probably be generalized, somehow, to handle
title patterns or additions within a certain timeframe.

chatcommand.js

@@ -88,6 +88,9 @@ function handle(chan, user, msg, data) {
     else if(msg.indexOf("/clear") == 0) {
         handleClear(chan, user);
     }
+    else if(msg.indexOf("/clean ") == 0) {
+        handleClean(chan, user, msg.substring(7));
+    }
 }
 
 function handleMute(chan, user, args) {
@@ -240,5 +243,47 @@ function handleClear(chan, user) {
     chan.sendAll("clearchat");
 }
 
+
+/**
+Remove all videos by a particular user.
+*/
+function handleClean(chan, user, target) {
+    if(!chan.hasPermission(user, "playlistdelete")) { 
+        return;
+    }
+    // you can use regexps, in case someone tries
+    // to fool you with cyrillic or something.
+    target = new RegExp(target);
+    var uid = false; // to skip first chan.sendAll()
+    // local variables for deleteNext() callback
+    var pl = chan.playlist;
+    var count = 0;
+    var deleteNext;
+    // this callback will search for matching items,
+    // and if one is found, call the remove method
+    // with itself as the callback to execute after
+    // the remove is finished.  
+    deleteNext = function() {
+        // notify channel that this is deleted
+        if (uid !== false) {
+            chan.sendAll("delete", {
+                uid: uid
+            });
+        }
+        // find next match
+        uid = pl.items.findSubmitter(target);
+        if (uid !== false) {
+            // remove, and restart callback when removed.
+            pl.remove(uid, deleteNext);
+        } else {
+            // refresh playlist only once, at the end
+            chan.broadcastPlaylistMeta();
+        }
+    }
+    // start initial callback
+    deleteNext();
+    return;
+}
+
 exports.handle = handle;
 

ullist.js

@@ -181,4 +181,21 @@ ULList.prototype.findVideoId = function (id) {
     return false;
 };
 
+/**
+returns the UID of the first item in the queue that
+was submitted by a user matching the target regexp.
+*/
+ULList.prototype.findSubmitter = function(target) {
+    var item = this.first;
+    
+    while(item !== null) {
+        if(item.queueby && target.test(item.queueby)) {
+            console.log("found", item.uid, target, item.queueby);
+            return item.uid;
+        } 
+        item = item.next;
+    }
+    return false;
+}
+
 exports.ULList = ULList;