[PATCH v2] emacs: Don't override mm-show-part in notmuch-show-view-part

[Mark Walters]

LGTM +1

This does not rely on the followup Austin mentioned in id:20130526063627.GQ5999 at mit.edu is
so I think this should go in as is as it fixes the
flet thing without changing the behaviour.

Best wishes

Mark

On Sun, 26 May 2013, Austin Clements <amdragon at MIT.EDU> wrote:
> Previously, notmuch-show-view-part overrode the function binding of
> mm-show-part to redirect it to notmuch-show-save-part to get notmuch's
> default file name handling in case mm-display-part decided to fall
> back to saving the part.  In addition to being messy, this depended on
> the now-deprecated dynamic binding behavior of flet.
>
> This patch removes the mm-show-part override in favor of passing the
> file name in to mm-show-part the way it expects, so we get its default
> file name handling.  It's not clear why we didn't do this before;
> mm-show-part has supported default file names since at least Emacs
> 23.1.
> ---
> This version overrides the default save directory to make it
> consistent with `notmuch-show-save-part'.
>
>  emacs/notmuch-show.el |   23 +++++++++--------------
>  1 file changed, 9 insertions(+), 14 deletions(-)
>
> diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
> index 423dd58..d773396 100644
> --- a/emacs/notmuch-show.el
> +++ b/emacs/notmuch-show.el
> @@ -528,20 +528,15 @@ message at DEPTH in the current thread."
>  
>  (defun notmuch-show-view-part (message-id nth &optional filename content-type )
>    (notmuch-with-temp-part-buffer message-id nth
> -    ;; set mm-inlined-types to nil to force an external viewer
> -    (let ((handle (mm-make-handle (current-buffer) (list content-type)))
> -	  (mm-inlined-types nil))
> -      ;; We override mm-save-part as notmuch-show-save-part is better
> -      ;; since it offers the filename. We need to lexically bind
> -      ;; everything we need for notmuch-show-save-part to prevent
> -      ;; potential dynamic shadowing.
> -      (lexical-let ((message-id message-id)
> -		    (nth nth)
> -		    (filename filename)
> -		    (content-type content-type))
> -	(flet ((mm-save-part (&rest args) (notmuch-show-save-part
> -					   message-id nth filename content-type)))
> -	  (mm-display-part handle))))))
> +    (let* ((disposition (if filename `(attachment (filename . ,filename))))
> +	   (handle (mm-make-handle (current-buffer) (list content-type)
> +				   nil nil disposition))
> +	   ;; Set the default save directory to be consistent with
> +	   ;; `notmuch-show-save-part'.
> +	   (mm-default-directory (or mailcap-download-directory "~/"))
> +	   ;; set mm-inlined-types to nil to force an external viewer
> +	   (mm-inlined-types nil))
> +      (mm-display-part handle))))
>  
>  (defun notmuch-show-interactively-view-part (message-id nth &optional filename content-type)
>    (notmuch-with-temp-part-buffer message-id nth
> -- 
> 1.7.10.4