[PATCH] 'LIST NEWSGROUPS grp' with -n cmd-line switch

use "LIST NEWSGROUPS grp" when using "-n"-cmdline switch if newsrc holds
just a small number of groups (currently a hardcoded limit of 25).
this gives a noticeable speedup on servers with lots of groups but might
slow down things on servers with heavy load and just a few groups...

--- mail.c
+++ mail.c
@@ -41,7 +41,11 @@
 #ifndef TCURSES_H
 #	include "tcurses.h"
 #endif /* !TCURSES_H */
-
+#ifdef NNTP_ABLE
+#	ifndef TNNTP_H
+#		include "tnntp.h"
+#	endif /* !TNNTP_H */
+#endif  /* NNTP_ABLE */
 /*
  * local prototypes
  */
@@ -249,6 +253,7 @@
 {
 #ifdef NNTP_ABLE
 	FILE *result;
+	static t_bool no_more_wildmat = FALSE;
 
 	if (read_news_via_nntp && !read_saved_news) {
 		if (read_local_newsgroups_file) {
@@ -267,15 +272,56 @@
 					unlink(local_newsgroups_file);
 			}
 		}
-#	if 0 /* TODO: */
-		if (list_newsgroups_wildmat_supported && newsrc_active
-		    && !list_active && num_active < some_useful_limit) {
-			for_each_group(i) {
-				snprintf(buff, sizeof(buff), "LIST NEWSGROUPS %s", active[i].name);
-				nntp_command(buff, OK_LIST, NULL, 0);
+#	if 1
+		/*
+		 * TODO: test me, find a usefull limit,
+		 *       optimize more than n groups to a wildmat?
+		 */
+		if (((nntp_caps.type == CAPABILITIES && nntp_caps.list_newsgroups) | nntp_caps.type != CAPABILITIES) && newsrc_active && !list_active && !no_more_wildmat && num_active < 25) {
+			int resp, i;
+			char buff[NNTP_STRLEN];
+			char line[NNTP_STRLEN];
+			char file[PATH_LEN];
+			char serverdir[PATH_LEN];
+			char *ptr;
+
+			if (nntp_tcp_port != IPPORT_NNTP)
+				snprintf(file, sizeof(file), "%s:%d", nntp_server, nntp_tcp_port);
+			else
+				STRCPY(file, quote_space_to_dash(nntp_server));
+
+			joinpath(serverdir, sizeof(serverdir), rcdir, file);
+			joinpath(file, sizeof(file), serverdir, NEWSGROUPS_FILE".tmp");
+
+			if ((result = fopen(file, "w")) != NULL) {
+				for_each_group(i) {
+					snprintf(buff, sizeof(buff), "LIST NEWSGROUPS %s", active[i].name);
+					put_server(buff);
+					resp = get_respcode(line, sizeof(line));
+					if (resp != OK_GROUPS) {
+						no_more_wildmat = TRUE;
+						break;
+					}
+					while ((ptr = tin_fgets(FAKE_NNTP_FP, FALSE)) != NULL) {
+#		ifdef DEBUG
+						if (debug & DEBUG_NNTP)
+							debug_print_file("NNTP", "<<< %s", ptr);
+#		endif /* DEBUG */
+						fprintf(result, "%s\n", ptr);
+					}
+				}
+				fclose(result);
+				result = fopen(file, "r");
+				unlink(file); /* unlink on close */
 			}
+			if (no_more_wildmat) {
+				fclose(result);
+				unlink(file);
+				return (nntp_command("LIST NEWSGROUPS", OK_GROUPS, NULL, 0));
+			} else
+				return result;
 		} else
-#	endif /* 0 */
+#	endif /* 1 */
 		return (nntp_command("LIST NEWSGROUPS", OK_GROUPS, NULL, 0));
 	} else
 #endif /* NNTP_ABLE */