Bugfix: If aborted due to disconnection, the import pointer would be off by one

causing the next article to not be imported the next time newslink ran.
Use XOVER to get article headers (if supported on server). This reduces the
likelihood of requesting a bad article number which some servers now consider
worthy of disconnection!

exec/newslink.js

@@ -263,13 +263,22 @@ var imported=0;
 var twitlist_fname = system.ctrl_dir + "twitlist.cfg";
 var use_twitlist = file_exists(twitlist_fname);
 
+function article_listed(list, article)
+{
+	var i;
+
+	for(i in list)
+		if(list[i]==article)
+			return(list.splice(i,1));
+
+	return(false);
+}
+
 printf("Scanning %lu message bases...\r\n",area.length);
 for(i in area) {
 	
-	if(!socket.is_connected) {
-		print("Disconnected");
+	if(!socket.is_connected)
 		break;
-	}
 
 	if(js.terminated || file_exists(stop_semaphore))
 		break;
@@ -491,6 +500,18 @@ for(i in area) {
 		ptr++;
 	}
 
+	delete article_list;
+	if(ptr<=last_msg) {
+		writeln(format("XOVER %u-%u", ptr, last_msg));
+		if(parseInt(readln())==224) {
+			printf("Getting headers for articles %u through %u\r\n", ptr, last_msg);
+			article_list = new Array();
+			while((rsp=readln())!='.' && rsp)
+				article_list.push(parseInt(rsp));
+			printf("%u new articles\r\n", article_list.length);
+		}
+	}
+
 	for(;socket.is_connected 
 		&& ptr<=last_msg 
 		&& !js.terminated
@@ -498,11 +519,15 @@ for(i in area) {
 		;ptr++) {
 		if(this.console!=undefined)
 			console.line_counter = 0;
+
+		if(article_list && !article_listed(article_list,ptr))
+			continue;
+
+		printf("Retrieving article: %u\r\n", ptr);
 		writeln(format("ARTICLE %lu",ptr));
 		rsp = readln();
 		if(rsp==null || rsp[0]!='2') {
-			if(debug)
-				printf("!ARTICLE %lu ERROR: %s\r\n",ptr,rsp);
+			printf("!ARTICLE %lu ERROR: %s\r\n",ptr,rsp);
 			continue;
 		}
 		body="";
@@ -762,6 +787,7 @@ for(i in area) {
 			printf("!IMPORT %lu ERROR: %s\r\n", ptr, msgbase.last_error);
 	}
 
+	ptr--;	/* point to last requested article number */
 	if(ptr > last_msg)
 		ptr = last_msg;
 	import_ptr = ptr;
@@ -781,8 +807,12 @@ for(i in area) {
 //		load("binarydecoder.js",sub);
 }
 
-writeln("quit");
-readln();
+if(!socket.is_connected)
+	print("!DISCONNECTED BY SERVER");
+else {
+	writeln("quit");
+	readln();
+}
 
 delete socket;