emacs: A prefix argument to `notmuch-show' should invert the matching message behaviour.

[notmuch] / emacs / notmuch-show.el

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 533cfa96dd8b89be115d84e85c889753dcd9b96a..284e9cd1e8fad1471dc4860fb1131d2473851313 100644 (file)
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -126,6 +126,11 @@ indentation."
                 (const :tag "View interactively"
                        notmuch-show-interactively-view-part)))
 
+(defcustom notmuch-show-only-matching-messages nil
+  "Only matching messages are shown by default."
+  :type 'boolean
+  :group 'notmuch-show)
+
 (defvar notmuch-show-thread-id nil)
 (make-variable-buffer-local 'notmuch-show-thread-id)
 (put 'notmuch-show-thread-id 'permanent-local t)
@@ -952,7 +957,7 @@ current buffer, if possible."
   (message (if notmuch-show-process-crypto
               "Processing cryptographic MIME parts."
             "Not processing cryptographic MIME parts."))
-  (notmuch-show-refresh-view))
+  (notmuch-show-refresh-view t))
 
 (defun notmuch-show-toggle-elide-non-matching ()
   "Toggle the display of non-matching messages."
@@ -961,7 +966,7 @@ current buffer, if possible."
   (message (if notmuch-show-elide-non-matching-messages
               "Showing matching messages only."
             "Showing all messages."))
-  (notmuch-show-refresh-view))
+  (notmuch-show-refresh-view t))
 
 (defun notmuch-show-toggle-thread-indentation ()
   "Toggle the indentation of threads."
@@ -970,7 +975,7 @@ current buffer, if possible."
   (message (if notmuch-show-indent-content
               "Content is indented."
             "Content is not indented."))
-  (notmuch-show-refresh-view))
+  (notmuch-show-refresh-view t))
 
 (defun notmuch-show-insert-tree (tree depth)
   "Insert the message tree TREE at depth DEPTH in the current thread."
@@ -1032,6 +1037,12 @@ function is used."
     ;; Set the default value for `notmuch-show-process-crypto' in this
     ;; buffer.
     (setq notmuch-show-process-crypto notmuch-crypto-process-mime)
+    ;; Set the default value for
+    ;; `notmuch-show-elide-non-matching-messages' in this buffer. If
+    ;; there is a prefix argument, invert the default.
+    (setq notmuch-show-elide-non-matching-messages notmuch-show-only-matching-messages)
+    (if current-prefix-arg
+       (setq notmuch-show-elide-non-matching-messages (not notmuch-show-elide-non-matching-messages)))
 
     (setq notmuch-show-thread-id thread-id
          notmuch-show-parent-buffer parent-buffer
@@ -1074,14 +1085,54 @@ function is used."
 
     (notmuch-show-mark-read)))
 
-(defun notmuch-show-refresh-view ()
+(defun notmuch-show-capture-state ()
+  "Capture the state of the current buffer.
+
+This includes:
+ - the list of open messages,
+ - the current message."
+  (list (notmuch-show-get-message-id) (notmuch-show-get-message-ids-for-open-messages)))
+
+(defun notmuch-show-apply-state (state)
+  "Apply STATE to the current buffer.
+
+This includes:
+ - opening the messages previously opened,
+ - closing all other messages,
+ - moving to the correct current message."
+  (let ((current (car state))
+       (open (cadr state)))
+
+    ;; Open those that were open.
+    (goto-char (point-min))
+    (loop do (notmuch-show-message-visible (notmuch-show-get-message-properties)
+                                          (member (notmuch-show-get-message-id) open))
+         until (not (notmuch-show-goto-message-next)))
+
+    ;; Go to the previously open message.
+    (goto-char (point-min))
+    (unless (loop if (string= current (notmuch-show-get-message-id))
+                 return t
+                 until (not (notmuch-show-goto-message-next)))
+      (goto-char (point-min))
+      (message "Previously current message not found."))
+    (notmuch-show-message-adjust)))
+
+(defun notmuch-show-refresh-view (&optional retain-state)
   "Refresh the current view.
 
-Refreshes the current view, observing changes in cryptographic preferences."
+Refreshes the current view, observing changes in display
+preferences. If RETAIN-STATE is non-nil then the state of the
+buffer is stored and re-applied after the refresh."
   (interactive)
-  (let ((inhibit-read-only t))
-    (erase-buffer))
-  (notmuch-show-worker))
+  (let ((inhibit-read-only t)
+       state)
+    (if retain-state
+       (setq state (notmuch-show-capture-state)))
+    (erase-buffer)
+    (notmuch-show-worker)
+    (if state
+       (notmuch-show-apply-state state))))
 
 (defvar notmuch-show-stash-map
   (let ((map (make-sparse-keymap)))
@@ -1664,7 +1715,7 @@ added."
   (interactive "P")
   (let ((parent-buffer notmuch-show-parent-buffer))
     (notmuch-kill-this-buffer)
-    (when parent-buffer
+    (when (buffer-live-p parent-buffer)
       (switch-to-buffer parent-buffer)
       (notmuch-search-next-thread)
       (if show-next