relay: add info "relay_client_count" with optional status name as argument

Use in evaluated strings (for example in /eval or triggers):
- "${info:relay_client_count}": total number of relay clients (any status)

With a specific status:
- "${info:relay_client_count,connecting}"
- "${info:relay_client_count,waiting_auth}"
- "${info:relay_client_count,connected}"
- "${info:relay_client_count,auth_failed}"
- "${info:relay_client_count,disconnected}"

src/plugins/relay/relay-client.c

@@ -137,6 +137,27 @@ relay_client_search_by_id (int id)
     return NULL;
 }
 
+/*
+ * Searches for a client status.
+ *
+ * Returns index of status in enum t_relay_status, -1 if status is not found.
+ */
+
+int
+relay_client_status_search (const char *name)
+{
+    int i;
+
+    for (i = 0; i < RELAY_NUM_STATUS; i++)
+    {
+        if (strcmp (relay_client_status_name[i], name) == 0)
+            return i;
+    }
+
+    /* status not found */
+    return -1;
+}
+
 /*
  * Sends a signal with the status of client ("relay_client_xxx").
  */

src/plugins/relay/relay-client.h

@@ -113,6 +113,7 @@ extern int relay_client_count;
 extern int relay_client_valid (struct t_relay_client *client);
 extern struct t_relay_client *relay_client_search_by_number (int number);
 extern struct t_relay_client *relay_client_search_by_id (int id);
+extern int relay_client_status_search (const char *name);
 extern void relay_client_set_desc (struct t_relay_client *client);
 extern int relay_client_recv_cb (void *arg_client, int fd);
 extern int relay_client_send (struct t_relay_client *client, const char *data,

src/plugins/relay/relay-info.c

@@ -27,6 +27,45 @@
 #include "relay-client.h"
 
 
+/*
+ * Returns relay info.
+ */
+
+const char *
+relay_info_get_info_cb (void *data, const char *info_name,
+                        const char *arguments)
+{
+    static char str_count[32];
+    int count, status;
+    struct t_relay_client *ptr_client;
+
+    /* make C compiler happy */
+    (void) data;
+
+    if (weechat_strcasecmp (info_name, "relay_client_count") == 0)
+    {
+        str_count[0] = '\0';
+        count = relay_client_count;
+        if (arguments && arguments[0])
+        {
+            status = relay_client_status_search (arguments);
+            if (status < 0)
+                return NULL;
+            count = 0;
+            for (ptr_client = relay_clients; ptr_client;
+                 ptr_client = ptr_client->next_client)
+            {
+                if ((int)ptr_client->status == status)
+                    count++;
+            }
+        }
+        snprintf (str_count, sizeof (str_count), "%d", count);
+        return str_count;
+    }
+
+    return NULL;
+}
+
 /*
  * Returns infolist with relay info.
  */
@@ -90,6 +129,15 @@ relay_info_get_infolist_cb (void *data, const char *infolist_name,
 void
 relay_info_init ()
 {
+    /* info hooks */
+    weechat_hook_info ("relay_client_count",
+                       N_("number of clients for relay"),
+                       /* TRANSLATORS: please do not translate the status names, they must be used in English */
+                       N_("status name (optional): connecting, waiting_auth, "
+                          "connected, auth_failed, disconnected"),
+                       &relay_info_get_info_cb, NULL);
+
+    /* infolist hooks */
     weechat_hook_infolist ("relay", N_("list of relay clients"),
                            N_("relay pointer (optional)"),
                            NULL,