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bug#21057: [PATCH] nnimap.el: add support for IMAP namespaces

From: Nikolaus Rath
Subject: bug#21057: [PATCH] nnimap.el: add support for IMAP namespaces
Date: Mon, 23 Jul 2018 19:00:06 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

On Jul 23 2018, Robert Pluim <address@hidden> wrote:
> Nikolaus Rath <address@hidden> writes:
> Nitpicks below.

Fixed, updated patch attached.

> Does this also work for secondary servers? I imagine it does.

Yes, it should.

>From 90b4930ec9004caaa39615edb1bd271bc14aeecb Mon Sep 17 00:00:00 2001
From: Nikolaus Rath <address@hidden>
Date: Mon, 23 Jul 2018 10:21:46 +0100
Subject: [PATCH] Make nnimap support IMAP namespaces

* lisp/gnus/nnimap.el (nnimap-use-namespaces): Introduce new
server variable.
(nnimap-group-to-imap, nnimap-get-groups): Transform IMAP group
names to Gnus group name by stripping / prefixing personal
namespace prefix.
(nnimap-open-connection-1): Ask server for namespaces and store them.

* lisp/gnus/nnimap.el (nnimap-request-group-scan)
(nnimap-request-create-group, nnimap-request-delete-group)
(nnimap-request-rename-group, nnimap-request-move-article)
(nnimap-request-accept-article, nnimap-request-list)
(nnimap-retrieve-group-data-early, nnimap-change-group)
(nnimap-split-incoming-mail): Use nnimap-group-to-imap.
(nnimap-group-to-imap): New function to map Gnus group names to
IMAP folder names.
 doc/misc/gnus.texi  |  6 ++++
 etc/NEWS            |  7 ++++
 lisp/gnus/nnimap.el | 93 +++++++++++++++++++++++++++++++++++++----------------
 3 files changed, 79 insertions(+), 27 deletions(-)

diff --git a/doc/misc/gnus.texi b/doc/misc/gnus.texi
index 6793ed..cd97cf 100644
--- a/doc/misc/gnus.texi
+++ b/doc/misc/gnus.texi
@@ -14320,6 +14320,12 @@ Customizing the IMAP Connection
 If address@hidden, record all @acronym{IMAP} commands in the
 @samp{"*imap log*"} buffer.
address@hidden nnimap-use-namespaces
+If address@hidden, omit the IMAP namespace prefix in nnimap group
+names. If your IMAP mailboxes are called something like @samp{INBOX}
+and @samp{INBOX.Lists.emacs}, but you'd like the nnimap group names to
+be @samp{INBOX} and @samp{Lists.emacs}, you should enable this option.
 @end table
diff --git a/etc/NEWS b/etc/NEWS
index fc2a5..04b4a 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -46,6 +46,13 @@ option --enable-check-lisp-object-type is therefore no 
longer as
 useful and so is no longer enabled by default in developer builds,
 to reduce differences between developer and production builds.
+** Gnus
+*** The nnimap backend now has support for IMAP namespaces.
+This feature can be enabled by setting the new 'nnimap-use-namespaces'
+server variable to non-nil.
 * Startup Changes in Emacs 27.1
diff --git a/lisp/gnus/nnimap.el b/lisp/gnus/nnimap.el
index 3b397..1736f8 100644
--- a/lisp/gnus/nnimap.el
+++ b/lisp/gnus/nnimap.el
@@ -55,6 +55,13 @@ nnimap-server-port
 If nnimap-stream is `ssl', this will default to `imaps'.  If not,
 it will default to `imap'.")
+(defvoo nnimap-use-namespaces nil
+  "Whether to use IMAP namespaces.
+If in Gnus your folder names in all start with (e.g.) `INBOX',
+you probably want to set this to t. The effects of this are
+purely cosmetic, but changing this variable will affect the
+names of your nnimap groups. ")
 (defvoo nnimap-stream 'undecided
   "How nnimap talks to the IMAP server.
 The value should be either `undecided', `ssl' or `tls',
@@ -110,6 +117,8 @@ nnimap-connection-alist
 (defvoo nnimap-current-infos nil)
+(defvoo nnimap-namespace nil)
 (defun nnimap-decode-gnus-group (group)
   (decode-coding-string group 'utf-8))
@@ -166,6 +175,19 @@ nnimap-quirks
 (defvar nnimap-inhibit-logging nil)
+(defun nnimap-group-to-imap (group)
+  "Convert Gnus group name to IMAP mailbox name."
+  (let* ((inbox (if nnimap-namespace
+                    (substring nnimap-namespace 0 -1) nil)))
+    (utf7-encode
+     (cond ((or (not inbox)
+                (string-equal group inbox))
+            group)
+           ((string-prefix-p "#" group)
+            (substring group 1))
+           (t
+            (concat nnimap-namespace group))) t)))
 (defun nnimap-buffer ()
   (nnimap-find-process-buffer nntp-server-buffer))
@@ -442,7 +464,8 @@ nnimap-open-connection-1
             (props (cdr stream-list))
             (greeting (plist-get props :greeting))
             (capabilities (plist-get props :capabilities))
-            (stream-type (plist-get props :type)))
+            (stream-type (plist-get props :type))
+             (server (nnoo-current-server 'nnimap)))
        (when (and stream (not (memq (process-status stream) '(open run))))
          (setq stream nil))
@@ -475,9 +498,7 @@ nnimap-open-connection-1
                                ;; the virtual server name and the address
-                                (list
-                                  (nnoo-current-server 'nnimap)
-                                 nnimap-address))
+                                (list server nnimap-address))
                  (setq nnimap-object nil)
@@ -496,8 +517,17 @@ nnimap-open-connection-1
                      (dolist (response (cddr (nnimap-command "CAPABILITY")))
                        (when (string= "CAPABILITY" (upcase (car response)))
                          (setf (nnimap-capabilities nnimap-object)
-                               (mapcar #'upcase (cdr response))))))
-                 ;; If the login failed, then forget the credentials
+                               (mapcar #'upcase (cdr response)))))
+                      (when (and nnimap-use-namespaces
+                                 (nnimap-capability "NAMESPACE"))
+                        (erase-buffer)
+                        (nnimap-wait-for-response (nnimap-send-command 
+                        (let ((response (nnimap-last-response-string)))
+                          (when (string-match
+                                 response)
+                            (setq nnimap-namespace (match-string 1 
+                  ;; If the login failed, then forget the credentials
                  ;; that are now possibly cached.
                  (dolist (host (list (nnoo-current-server 'nnimap)
@@ -837,7 +867,7 @@ nnimap-request-group-scan
       (with-current-buffer (nnimap-buffer)
        (let ((group-sequence
-              (nnimap-send-command "SELECT %S" (utf7-encode group t)))
+              (nnimap-send-command "SELECT %S" (nnimap-group-to-imap group)))
               (nnimap-send-command "UID FETCH 1:* FLAGS")))
          (setf (nnimap-group nnimap-object) group)
@@ -870,13 +900,13 @@ nnimap-request-create-group
   (setq group (nnimap-decode-gnus-group group))
   (when (nnimap-change-group nil server)
     (with-current-buffer (nnimap-buffer)
-      (car (nnimap-command "CREATE %S" (utf7-encode group t))))))
+      (car (nnimap-command "CREATE %S" (nnimap-group-to-imap group))))))
 (deffoo nnimap-request-delete-group (group &optional _force server)
   (setq group (nnimap-decode-gnus-group group))
   (when (nnimap-change-group nil server)
     (with-current-buffer (nnimap-buffer)
-      (car (nnimap-command "DELETE %S" (utf7-encode group t))))))
+      (car (nnimap-command "DELETE %S" (nnimap-group-to-imap group))))))
 (deffoo nnimap-request-rename-group (group new-name &optional server)
   (setq group (nnimap-decode-gnus-group group))
@@ -884,7 +914,7 @@ nnimap-request-rename-group
     (with-current-buffer (nnimap-buffer)
       (car (nnimap-command "RENAME %S %S"
-                          (utf7-encode group t) (utf7-encode new-name t))))))
+                          (nnimap-group-to-imap group) (nnimap-group-to-imap 
 (defun nnimap-unselect-group ()
   ;; Make sure we don't have this group open read/write by asking
@@ -944,7 +974,7 @@ nnimap-request-move-article
                                "UID COPY %d %S"))
                     (result (nnimap-command
                              command article
-                             (utf7-encode internal-move-group t))))
+                              (nnimap-group-to-imap internal-move-group))))
                 (when (and (car result) (not can-move))
                   (nnimap-delete-article article))
                 (cons internal-move-group
@@ -1011,7 +1041,7 @@ nnimap-process-expiry-targets
                     "UID MOVE %s %S"
                   "UID COPY %s %S")
                 (nnimap-article-ranges (gnus-compress-sequence articles))
-                (utf7-encode (gnus-group-real-name nnmail-expiry-target) t))
+                (nnimap-group-to-imap (gnus-group-real-name 
                (set (if can-move 'deleted-articles 'articles-to-delete) 
@@ -1136,7 +1166,7 @@ nnimap-request-update-group-status
                      (unsubscribe "UNSUBSCRIBE")))))
       (when command
        (with-current-buffer (nnimap-buffer)
-         (nnimap-command "%s %S" (cadr command) (utf7-encode group t)))))))
+         (nnimap-command "%s %S" (cadr command) (nnimap-group-to-imap 
 (deffoo nnimap-request-set-mark (group actions &optional server)
   (setq group (nnimap-decode-gnus-group group))
@@ -1191,7 +1221,7 @@ nnimap-request-accept-article
          (setq sequence (nnimap-send-command
-                         "APPEND %S {%d}" (utf7-encode group t)
+                         "APPEND %S {%d}" (nnimap-group-to-imap group)
                          (length message)))
          (unless nnimap-streaming
            (nnimap-wait-for-connection "^[+]"))
@@ -1271,8 +1301,12 @@ nnimap-add-cr
 (defun nnimap-get-groups ()
-  (let ((sequence (nnimap-send-command "LIST \"\" \"*\""))
-       groups)
+  (let* ((sequence (nnimap-send-command "LIST \"\" \"*\""))
+         (prefix nnimap-namespace)
+         (prefix-len (if prefix (length prefix) nil))
+         (inbox (if prefix
+                    (substring prefix 0 -1) nil))
+         groups)
     (nnimap-wait-for-response sequence)
     (subst-char-in-region (point-min) (point-max)
                          ?\\ ?% t)
@@ -1289,11 +1323,16 @@ nnimap-get-groups
                           (skip-chars-backward " \r\"")
        (unless (member '%NoSelect flags)
-         (push (utf7-decode (if (stringp group)
-                                group
-                              (format "%s" group))
-                             t)
-               groups))))
+          (let* ((group (utf7-decode (if (stringp group) group
+                                       (format "%s" group)) t))
+                 (group (cond ((or (not prefix)
+                                   (equal inbox group))
+                               group)
+                              ((string-prefix-p prefix group)
+                               (substring group prefix-len))
+                              (t
+                               (concat "#" group)))))
+            (push group groups)))))
     (nreverse groups)))
 (defun nnimap-get-responses (sequences)
@@ -1319,7 +1358,7 @@ nnimap-request-list
            (dolist (group groups)
              (setf (nnimap-examined nnimap-object) group)
              (push (list (nnimap-send-command "EXAMINE %S"
-                                              (utf7-encode group t))
+                                              (nnimap-group-to-imap group))
            (nnimap-wait-for-response (caar sequences))
@@ -1391,7 +1430,7 @@ nnimap-retrieve-group-data-early
               (list (nnimap-send-command "EXAMINE %S (%s (%s %s))"
-                                         (utf7-encode group t)
+                                         (nnimap-group-to-imap group)
                                          (nnimap-quirk "QRESYNC")
                                          uidvalidity modseq)
@@ -1413,7 +1452,7 @@ nnimap-retrieve-group-data-early
                (cl-incf (nnimap-initial-resync nnimap-object))
                (setq start 1))
              (push (list (nnimap-send-command "%s %S" command
-                                              (utf7-encode group t))
+                                              (nnimap-group-to-imap group))
                          (nnimap-send-command "UID FETCH %d:* FLAGS" start)
                          start group command)
@@ -1847,7 +1886,7 @@ nnimap-change-group
                                       (if read-only
-                                      (utf7-encode group t))))
+                                      (nnimap-group-to-imap group))))
           (when (car result)
             (setf (nnimap-group nnimap-object) group
                   (nnimap-select-result nnimap-object) result)
@@ -2105,7 +2144,7 @@ nnimap-split-incoming-mail
            (dolist (spec specs)
              (when (and (not (member (car spec) groups))
                         (not (eq (car spec) 'junk)))
-               (nnimap-command "CREATE %S" (utf7-encode (car spec) t))))
+               (nnimap-command "CREATE %S" (nnimap-group-to-imap (car spec)))))
            ;; Then copy over all the messages.
            (dolist (spec specs)
@@ -2121,7 +2160,7 @@ nnimap-split-incoming-mail
                                     "UID MOVE %s %S"
                                   "UID COPY %s %S")
                                 (nnimap-article-ranges ranges)
-                                (utf7-encode group t))
+                               (nnimap-group-to-imap group))
            ;; Wait for the last COPY response...

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