[PATCH v2 8/9] emacs: Define a common shared keymap for all of notmuch

diff --git a/0c/c8e87941114d12809e3cfaf12fe6b402ff091c b/0c/c8e87941114d12809e3cfaf12fe6b402ff091c
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+++ b/0c/c8e87941114d12809e3cfaf12fe6b402ff091c
@@ -0,0 +1,145 @@
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+From: Austin Clements <amdragon@MIT.EDU>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH v2 8/9] emacs: Define a common shared keymap for all of\r
+ notmuch\r
+Date: Tue,  3 Sep 2013 17:45:24 -0400\r
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+\r
+This defines a single, currently empty keymap that all other notmuch\r
+mode maps inherit from.\r
+---\r
+ emacs/notmuch-hello.el |   10 ++++++++--\r
+ emacs/notmuch-lib.el   |    5 +++++\r
+ emacs/notmuch-show.el  |    1 +\r
+ emacs/notmuch.el       |    1 +\r
+ 4 files changed, 15 insertions(+), 2 deletions(-)\r
+\r
+diff --git a/emacs/notmuch-hello.el b/emacs/notmuch-hello.el\r
+index 6a7b884..46baf55 100644\r
+--- a/emacs/notmuch-hello.el\r
++++ b/emacs/notmuch-hello.el\r
+@@ -515,8 +515,14 @@ Such a list can be computed with `notmuch-hello-query-counts'."\r
+ \r
+ \r
+ (defvar notmuch-hello-mode-map\r
+-  (let ((map (make-sparse-keymap)))\r
+-    (set-keymap-parent map widget-keymap)\r
++  (let ((map (if (fboundp 'make-composed-keymap)\r
++               ;; Inherit both widget-keymap and notmuch-common-keymap\r
++               (make-composed-keymap widget-keymap)\r
++             ;; Before Emacs 24, keymaps didn't support multiple\r
++             ;; inheritance,, so just copy the widget keymap since\r
++             ;; it's unlikely to change.\r
++             (copy-keymap widget-keymap))))\r
++    (set-keymap-parent map notmuch-common-keymap)\r
+     (define-key map "v" (lambda () "Display the notmuch version" (interactive)\r
+                         (message "notmuch version %s" (notmuch-version))))\r
+     (define-key map "?" 'notmuch-help)\r
+diff --git a/emacs/notmuch-lib.el b/emacs/notmuch-lib.el\r
+index 782badb..2bf1d2f 100644\r
+--- a/emacs/notmuch-lib.el\r
++++ b/emacs/notmuch-lib.el\r
+@@ -128,6 +128,11 @@ For example, if you wanted to remove an \"inbox\" tag and add an\r
+   :group 'notmuch-search\r
+   :group 'notmuch-show)\r
+ \r
++(defvar notmuch-common-keymap\r
++  (let ((map (make-sparse-keymap)))\r
++    map)\r
++  "Keymap shared by all notmuch modes.")\r
++\r
+ ;; By default clicking on a button does not select the window\r
+ ;; containing the button (as opposed to clicking on a widget which\r
+ ;; does). This means that the button action is then executed in the\r
+diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el\r
+index 380df66..9f67340 100644\r
+--- a/emacs/notmuch-show.el\r
++++ b/emacs/notmuch-show.el\r
+@@ -1264,6 +1264,7 @@ reset based on the original query."\r
+ \r
+ (defvar notmuch-show-mode-map\r
+       (let ((map (make-sparse-keymap)))\r
++      (set-keymap-parent map notmuch-common-keymap)\r
+       (define-key map "?" 'notmuch-help)\r
+       (define-key map "q" 'notmuch-kill-this-buffer)\r
+       (define-key map (kbd "<C-tab>") 'widget-backward)\r
+diff --git a/emacs/notmuch.el b/emacs/notmuch.el\r
+index 0304096..e098bd7 100644\r
+--- a/emacs/notmuch.el\r
++++ b/emacs/notmuch.el\r
+@@ -198,6 +198,7 @@ first line of documentation for the bound function."\r
+ \r
+ (defvar notmuch-search-mode-map\r
+   (let ((map (make-sparse-keymap)))\r
++    (set-keymap-parent map notmuch-common-keymap)\r
+     (define-key map "?" 'notmuch-help)\r
+     (define-key map "q" 'notmuch-kill-this-buffer)\r
+     (define-key map "x" 'notmuch-kill-this-buffer)\r
+-- \r
+1.7.10.4\r
+\r