Add "irc_is_nick" for function info_get to check if a string is a valid IRC nick name (patch #7133)

src/plugins/irc/irc-info.c

@@ -79,6 +79,12 @@ irc_info_get_info_cb (void *data, const char *info_name,
             return str_true;
         return NULL;
     }
+    else if (weechat_strcasecmp (info_name, "irc_is_nick") == 0)
+    {
+        if (irc_nick_is_nick (arguments))
+            return str_true;
+        return NULL;
+    }
     else if (weechat_strcasecmp (info_name, "irc_nick") == 0)
     {
         ptr_server = irc_server_search (arguments);
@@ -396,9 +402,12 @@ void
 irc_info_init ()
 {
     /* info hooks */
-    weechat_hook_info ("irc_is_channel", N_("1 if string is an IRC channel"),
+    weechat_hook_info ("irc_is_channel", N_("1 if string is a valid IRC channel name"),
                        N_("channel name"),
                        &irc_info_get_info_cb, NULL);
+    weechat_hook_info ("irc_is_nick", N_("1 if string is a valid IRC nick name"),
+                       N_("nickname"),
+                       &irc_info_get_info_cb, NULL);
     weechat_hook_info ("irc_nick", N_("get current nick on a server"),
                        N_("server name"),
                        &irc_info_get_info_cb, NULL);

src/plugins/irc/irc-nick.c

@@ -56,6 +56,35 @@ irc_nick_valid (struct t_irc_channel *channel, struct t_irc_nick *nick)
     return 0;
 }
 
+/*
+ * irc_nick_is_nick: check if string is a valid nick string (RFC 1459)
+ *                   return 1 if string valid nick
+ *                          0 if not a valid nick
+ */
+
+int
+irc_nick_is_nick (const char *string)
+{
+    const char *ptr;
+    
+    if (!string || !string[0])
+        return 0;
+    
+    /* first char must not be a number or hyphen */
+    ptr = string;
+    if (strchr ("0123456789-", *ptr))
+        return 0;
+    
+    while (ptr && ptr[0])
+    {
+        if (!strchr (IRC_NICK_VALID_CHARS, *ptr))
+            return 0;
+        ptr++;
+    }
+    
+    return 1;
+}
+
 /*
  * irc_nick_find_color: find a color for a nick (according to nick letters)
  */

src/plugins/irc/irc-nick.h

@@ -21,6 +21,8 @@
 #define __WEECHAT_IRC_NICK_H 1
 
 #define IRC_NICK_DEFAULT_PREFIXES_LIST "@%+~&!-"
+#define IRC_NICK_VALID_CHARS           "abcdefghijklmnopqrstuvwxyzABCDEFGHI" \
+    "JKLMNOPQRSTUVWXYZ0123456789-[]\\`_^{|}"
 
 #define IRC_NICK_CHANOWNER  1
 #define IRC_NICK_CHANADMIN  2
@@ -61,6 +63,7 @@ struct t_irc_nick
 
 extern int irc_nick_valid (struct t_irc_channel *channel,
                            struct t_irc_nick *nick);
+extern int irc_nick_is_nick (const char *string);
 extern const char *irc_nick_find_color (const char *nickname);
 extern void irc_nick_get_gui_infos (struct t_irc_nick *nick,
                                     char *prefix, int *prefix_color,