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+Date: Tue, 17 Jan 2012 18:53:18 -0500\r
+From: Austin Clements <amdragon@MIT.EDU>\r
+To: Mark Walters <markwalters1009@gmail.com>\r
+Subject: Re: [PATCH v3] Make buttons for attachments allow viewing as well as\r
+ saving\r
+Message-ID: <20120117235318.GZ16740@mit.edu>\r
+References: <87lip5rj43.fsf@qmul.ac.uk>\r
+ <1326843886-18387-1-git-send-email-markwalters1009@gmail.com>\r
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+\r
+Quoth Mark Walters on Jan 17 at 11:44 pm:\r
+> Define a keymap for attachment buttons to allow multiple actions.\r
+> Define 3 possible actions:\r
+> save attachment: exactly as currently,\r
+> view attachment: uses mailcap entry,\r
+> view attachment with user chosen program\r
+> \r
+> Keymap on a button is: s for save, v for view and o for view with\r
+> other program. Default (i.e. enter or mouse button) is save but this\r
+> is configurable in notmuch customize.\r
+> \r
+> One implementation detail: the view attachment function forces all\r
+> attachments to be "displayed" using mailcap even if emacs could\r
+> display them itself. Thus, for example, text/html appears in a browser\r
+> and text/plain asks whether to save (on a standard debian setup)\r
+\r
+Oof, sorry. Two more tweaks that I really should have caught in the\r
+previous version. After that this gets my automatic +1.\r
+\r
+> ---\r
+> emacs/notmuch-show.el | 106 ++++++++++++++++++++++++++++++++++++++-----------\r
+> 1 files changed, 82 insertions(+), 24 deletions(-)\r
+> \r
+> diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el\r
+> index 03c1f6b..0aaaf79 100644\r
+> --- a/emacs/notmuch-show.el\r
+> +++ b/emacs/notmuch-show.el\r
+> @@ -281,10 +281,21 @@ message at DEPTH in the current thread."\r
+> (run-hooks 'notmuch-show-markup-headers-hook)))))\r
+> \r
+> (define-button-type 'notmuch-show-part-button-type\r
+> - 'action 'notmuch-show-part-button-action\r
+> + 'action 'notmuch-show-part-button-default\r
+> + 'keymap 'notmuch-show-part-button-map\r
+> 'follow-link t\r
+> 'face 'message-mml)\r
+> \r
+> +(defvar notmuch-show-part-button-map\r
+> + (let ((map (make-sparse-keymap)))\r
+> + (set-keymap-parent map button-map)\r
+> + (define-key map "s" 'notmuch-show-part-button-save)\r
+> + (define-key map "v" 'notmuch-show-part-button-view)\r
+> + (define-key map "o" 'notmuch-show-part-button-interactively-view)\r
+\r
+Indentation.\r
+\r
+> + map)\r
+> + "Submap for button commands")\r
+> +(fset 'notmuch-show-part-button-map notmuch-show-part-button-map)\r
+> +\r
+> (defun notmuch-show-insert-part-header (nth content-type declared-type &optional name comment)\r
+> (let ((button))\r
+> (setq button\r
+> @@ -299,29 +310,48 @@ message at DEPTH in the current thread."\r
+> " ]")\r
+> :type 'notmuch-show-part-button-type\r
+> :notmuch-part nth\r
+> - :notmuch-filename name))\r
+> + :notmuch-filename name\r
+> + :notmuch-content-type content-type))\r
+> (insert "\n")\r
+> ;; return button\r
+> button))\r
+> \r
+> ;; Functions handling particular MIME parts.\r
+> \r
+> -(defun notmuch-show-save-part (message-id nth &optional filename)\r
+> - (let ((process-crypto notmuch-show-process-crypto))\r
+> - (with-temp-buffer\r
+> - (setq notmuch-show-process-crypto process-crypto)\r
+> - ;; Always acquires the part via `notmuch part', even if it is\r
+> - ;; available in the JSON output.\r
+> - (insert (notmuch-show-get-bodypart-internal message-id nth))\r
+> - (let ((file (read-file-name\r
+> - "Filename to save as: "\r
+> - (or mailcap-download-directory "~/")\r
+> - nil nil\r
+> - filename)))\r
+> - ;; Don't re-compress .gz & al. Arguably we should make\r
+> - ;; `file-name-handler-alist' nil, but that would chop\r
+> - ;; ange-ftp, which is reasonable to use here.\r
+> - (mm-write-region (point-min) (point-max) file nil nil nil 'no-conversion t)))))\r
+> +(defmacro notmuch-with-temp-part-buffer (message-id nth &rest body)\r
+> + (declare (indent 2))\r
+> + (let ((process-crypto (make-symbol "process-crypto")))\r
+> + `(let ((,process-crypto notmuch-show-process-crypto))\r
+> + (with-temp-buffer\r
+> + (setq notmuch-show-process-crypto ,process-crypto)\r
+> + ;; Always acquires the part via `notmuch part', even if it is\r
+> + ;; available in the JSON output.\r
+> + (insert (notmuch-show-get-bodypart-internal ,message-id ,nth))\r
+> + ,@body))))\r
+> +\r
+> +(defun notmuch-show-save-part (message-id nth &optional filename content-type)\r
+> + (notmuch-with-temp-part-buffer message-id nth\r
+> + (let ((file (read-file-name\r
+> + "Filename to save as: "\r
+> + (or mailcap-download-directory "~/")\r
+> + nil nil\r
+> + filename)))\r
+> + ;; Don't re-compress .gz & al. Arguably we should make\r
+> + ;; `file-name-handler-alist' nil, but that would chop\r
+> + ;; ange-ftp, which is reasonable to use here.\r
+> + (mm-write-region (point-min) (point-max) file nil nil nil 'no-conversion t))))\r
+> +\r
+> +(defun notmuch-show-view-part (message-id nth &optional filename content-type )\r
+> + (notmuch-with-temp-part-buffer message-id nth\r
+> + ;; set mm-inlined-types to nil to force an external viewer\r
+> + (let ((handle (mm-make-handle (current-buffer) (list content-type)))\r
+> + (mm-inlined-types nil))\r
+> + (mm-display-part handle t))))\r
+> +\r
+> +(defun notmuch-show-interactively-view-part (message-id nth &optional filename content-type)\r
+> + (notmuch-with-temp-part-buffer message-id nth\r
+> + (let ((handle (mm-make-handle (current-buffer) (list content-type))))\r
+> + (mm-interactively-view-part handle))))\r
+> \r
+> (defun notmuch-show-mm-display-part-inline (msg part nth content-type)\r
+> "Use the mm-decode/mm-view functions to display a part in the\r
+> @@ -1502,12 +1532,40 @@ buffer."\r
+> \r
+> ;; Commands typically bound to buttons.\r
+> \r
+> -(defun notmuch-show-part-button-action (button)\r
+> - (let ((nth (button-get button :notmuch-part)))\r
+> - (if nth\r
+> - (notmuch-show-save-part (notmuch-show-get-message-id) nth\r
+> - (button-get button :notmuch-filename))\r
+> - (message "Not a valid part (is it a fake part?)."))))\r
+> +(defcustom notmuch-show-part-button-default-action 'notmuch-show-save-part\r
+> + "Default part header button action (on ENTER or mouse click)."\r
+> + :group 'notmuch\r
+> + :type '(choice (const :tag "Save part"\r
+> + notmuch-show-save-part)\r
+> + (const :tag "View part"\r
+> + notmuch-show-view-part)\r
+> + (const :tag "View interactively"\r
+> + notmuch-show-interactively-view-part)))\r
+\r
+defcustoms customarily appear at the top of the file (see the rest of\r
+the defcustoms in notmuch-show.el)\r
+\r
+> +\r
+> +(defun notmuch-show-part-button-default (&optional button)\r
+> + (interactive)\r
+> + (notmuch-show-part-button-internal button notmuch-show-part-button-default-action))\r
+> +\r
+> +(defun notmuch-show-part-button-save (&optional button)\r
+> + (interactive)\r
+> + (notmuch-show-part-button-internal button #'notmuch-show-save-part))\r
+> +\r
+> +(defun notmuch-show-part-button-view (&optional button)\r
+> + (interactive)\r
+> + (notmuch-show-part-button-internal button #'notmuch-show-view-part))\r
+> +\r
+> +(defun notmuch-show-part-button-interactively-view (&optional button)\r
+> + (interactive)\r
+> + (notmuch-show-part-button-internal button #'notmuch-show-interactively-view-part))\r
+> +\r
+> +(defun notmuch-show-part-button-internal (button handler)\r
+> + (let ((button (or button (button-at (point)))))\r
+> + (if button\r
+> + (let ((nth (button-get button :notmuch-part)))\r
+> + (if nth\r
+> + (funcall handler (notmuch-show-get-message-id) nth\r
+> + (button-get button :notmuch-filename)\r
+> + (button-get button :notmuch-content-type)))))))\r
+> \r
+> ;;\r
+> \r