Stefan Monnier <monnier@iro.umontreal.ca> wrote:
 > Sorry, can't find the patch, can someone resend it?

lisp/erc/erc-join.el | 48 ++++++++++++++++++++++++++++++++++--------------
 1 file changed, 34 insertions(+), 14 deletions(-)

diff --git a/lisp/erc/erc-join.el b/lisp/erc/erc-join.el
index 4c99898..aafd916 100644
--- a/lisp/erc/erc-join.el
+++ b/lisp/erc/erc-join.el
@@ -54,8 +54,12 @@
 (defcustom erc-autojoin-channels-alist nil
   "Alist of channels to autojoin on IRC networks.
 Every element in the alist has the form (SERVER . CHANNELS).
-SERVER is a regexp matching the server, and channels is the
-list of channels to join.
+SERVER is a regexp matching the server, and channels is the list
+of channels to join.  SERVER can also be a symbol, in which case
+it is matched against the value of `erc-network' instead of
+`erc-server-announced-name' or `erc-session-server' (this can be
+useful when connecting to an IRC proxy that relays several
+networks under the same server).

 If the channel(s) require channel keys for joining, the passwords
 are found via auth-source.  For instance, if you use ~/.authinfo
@@ -122,6 +126,14 @@ This is called from a timer set up by
`erc-autojoin-channels'."
       (erc-log "Delayed autojoin started (no ident success detected yet)")
       (erc-autojoin-channels server nick))))

+(defun erc-autojoin-server-match (candidate)
+  "Match the current network or server against CANDIDATE, a key
+from `erc-autojoin-channels-alist'."
+  (or (eq candidate erc-network)
+      (and (stringp candidate)
+          (string-match candidate (or erc-server-announced-name
+                                      erc-session-server)))))
+
 (defun erc-autojoin-after-ident (network nick)
   "Autojoin channels in `erc-autojoin-channels-alist'.
 This function is run from `erc-nickserv-identified-hook'."
@@ -136,7 +148,7 @@ This function is run from
`erc-nickserv-identified-hook'."
       ;; We may already be in these channels, e.g. because the
       ;; autojoin timer went off.
       (dolist (l erc-autojoin-channels-alist)
-       (when (string-match (car l) server)
+       (when (erc-autojoin-server-match (car l))
          (dolist (chan (cdr l))
            (unless (erc-member-ignore-case chan joined)
              (erc-server-join-channel server chan)))))))
@@ -154,7 +166,7 @@ This function is run from
`erc-nickserv-identified-hook'."
                              server nick (current-buffer))))
     ;; `erc-autojoin-timing' is `connect':
     (dolist (l erc-autojoin-channels-alist)
-      (when (string-match (car l) server)
+      (when (erc-autojoin-server-match (car l))
        (dolist (chan (cdr l))
          (erc-server-join-channel server chan)))))
   ;; Return nil to avoid stomping on any other hook funcs.
@@ -175,20 +187,30 @@ This function is run from
`erc-nickserv-identified-hook'."
                                 (concat " " password)
                               "")))))

+(defun erc-autojoin-current-server ()
+  "Compute the current server for lookup in `erc-autojoin-channels-alist'.
+Respects `erc-autojoin-domain-only'."
+  (let ((server (or erc-server-announced-name erc-session-server)))
+    (if (and erc-autojoin-domain-only
+            (string-match "[^.\n]+\\.\\([^.\n]+\\.[^.\n]+\\)$" server))
+       (match-string 1 server)
+      server)))
+
 (defun erc-autojoin-add (proc parsed)
   "Add the channel being joined to `erc-autojoin-channels-alist'."
   (let* ((chnl (erc-response.contents parsed))
         (nick (car (erc-parse-user (erc-response.sender parsed))))
         (server (with-current-buffer (process-buffer proc)
-                  (or erc-server-announced-name erc-session-server))))
+                  (erc-autojoin-current-server))))
     (when (erc-current-nick-p nick)
-      (when (and erc-autojoin-domain-only
-                (string-match "[^.\n]+\\.\\([^.\n]+\\.[^.\n]+\\)$" server))
-       (setq server (match-string 1 server)))
-      (let ((elem (assoc server erc-autojoin-channels-alist)))
+      (let ((elem (or (assoc erc-network erc-autojoin-channels-alist)
+                     (assoc server erc-autojoin-channels-alist))))
        (if elem
            (unless (member chnl (cdr elem))
              (setcdr elem (cons chnl (cdr elem))))
+         ;; This always keys on server, not network -- user can
+         ;; override by simply adding a network to
+         ;; `erc-autojoin-channels-alist'
          (setq erc-autojoin-channels-alist
                (cons (list server chnl)
                      erc-autojoin-channels-alist))))))
@@ -203,12 +225,10 @@ This function is run from
`erc-nickserv-identified-hook'."
   (let* ((chnl (car (erc-response.command-args parsed)))
         (nick (car (erc-parse-user (erc-response.sender parsed))))
         (server (with-current-buffer (process-buffer proc)
-                  (or erc-server-announced-name erc-session-server))))
+                  (erc-autojoin-current-server))))
     (when (erc-current-nick-p nick)
-      (when (and erc-autojoin-domain-only
-                (string-match "[^.\n]+\\.\\([^.\n]+\\.[^.\n]+\\)$" server))
-       (setq server (match-string 1 server)))
-      (let ((elem (assoc server erc-autojoin-channels-alist)))
+      (let ((elem (or (assoc erc-network erc-autojoin-channels-alist)
+                     (assoc server erc-autojoin-channels-alist))))
        (when elem
          (setcdr elem (delete chnl (cdr elem)))
          (unless (cdr elem)

 On Tue, Mar 10, 2015, 9:23 PM Kelvin White <kwhite@gnu.org> wrote:

Sorry, I thought it was attached.