Don't join erc channels doubly

* erc-join.el (erc-autojoin-channels): Don't join channels
more than once (if you have several nicks) (bug#20695).

1 files changed, 8 insertions, 2 deletions

diff --git a/lisp/erc/erc-join.el b/lisp/erc/erc-join.el
index 4c99898bc41..c1ce14ab016 100644
--- a/lisp/erc/erc-join.el
+++ b/lisp/erc/erc-join.el
@@ -156,7 +156,13 @@ This function is run from `erc-nickserv-identified-hook'."
     (dolist (l erc-autojoin-channels-alist)
       (when (string-match (car l) server)
         (dolist (chan (cdr l))
-          (erc-server-join-channel server chan)))))
+          (let ((buffer (erc-get-buffer chan)))
+            ;; Only auto-join the channels that we aren't already in
+            ;; using a different nick.
+            (when (or (not buffer)
+                      (not (with-current-buffer buffer
+                             (erc-server-process-alive))))
+              (erc-server-join-channel server chan)))))))
   ;; Return nil to avoid stomping on any other hook funcs.
   nil)
 
@@ -170,7 +176,7 @@ This function is run from `erc-nickserv-identified-hook'."
          (password (if (functionp secret)
                        (funcall secret)
                      secret)))
-    (erc-server-send (concat "join " channel
+    (erc-server-send (concat "JOIN " channel
                              (if password
                                  (concat " " password)
                                "")))))