I think this could be simplified a lot and many of the known issues
addressed if this were narrowed to *only* resuming from drafts.
message-mode draft files aren't MIME messages (or, at least, they're
never multipart, and message-mode has its own special annotations over
basic RFC 822), so rather than treating the draft as a MIME message
and trying to transform it back into a message-mode-compatible draft
(which, in full generality, would be somewhere between hard and
impossible), what about just dumping the raw contents of the draft
file into a buffer and pointing message-mode at it?  If the draft file
is available, you could even open it directly (this wouldn't work for
remote usage, but remote drafts introduce many other problems, too).

2011/7/16 Antoine Beaupr? <anarcat at koumbit.org>:
> Add a new function to allow editing a new message starting from an
> existing one, roughly the equivalent of Mutt's resend-message
> functionality.
>
> Hooks into the search and show views through the "e" keybinding.
>
> "draft" tag is removed after the email is sent and the target thread
> is marked as deleted.
>
> Known issues:
>
> ?1. only the first MIME part of the email is used
> ?2. running this on a thread with more than one message has not been
> ?tested
> ?3. encoding is broken when files are reloaded, because we don't parse
> ?MIME back
> ?4. draft files are left around when mails are written, even if they
> ?are not postponed
>
> Todo:
>
> ?1. use the proper gnus hooks to resume emails:
> ?https://www.gnu.org/software/emacs/manual/html_node/message/Message-Actions.html#index-message_002dpostpone_002dactions-334
>
> ?2. write tests
>
> Signed-off-by: Antoine Beaupr? <anarcat at koumbit.org>
> ---
> ?emacs/notmuch-mua.el ?| ? 50 
> +++++++++++++++++++++++++++++++++++++++++++++++++
> ?emacs/notmuch-show.el | ? ?6 +++++
> ?emacs/notmuch.el ? ? ?| ? ?7 ++++++
> ?3 files changed, 63 insertions(+), 0 deletions(-)
>
> diff --git a/emacs/notmuch-mua.el b/emacs/notmuch-mua.el
> index 274c5da..11d014d 100644
> --- a/emacs/notmuch-mua.el
> +++ b/emacs/notmuch-mua.el
> @@ -201,6 +201,56 @@ the From: address first."
> ? ? ? ? ? (list (cons 'from (notmuch-mua-prompt-for-sender))))))
> ? ? (notmuch-mua-mail nil nil other-headers)))
>
> +(defun notmuch-mua-delete-postponed (query-string)
> + ?"Delete postponed mail after sending."
> + ?(notmuch-tag query-string "+deleted")
> + ?(notmuch-tag query-string "-draft")
> +)
> +
> +(defun notmuch-mua-edit-mail (query-string)
> + ?"Create a new mail composition window based on the current mail."
> + ?(interactive)
> + ?(let (headers
> + ? ? ? body
> + ? ? ? (args '("show" "--format=raw")))
> + ? ?(if notmuch-show-process-crypto
> + ? ? ? (setq args (append args '("--decrypt"))))
> + ? ?(setq args (append args (list query-string)))
> + ? ?;; This make assumptions about the output of `notmuch show', but
> + ? ?;; really only that the headers come first followed by a blank
> + ? ?;; line and then the body.
> + ? ?(with-temp-buffer
> + ? ? ?(apply 'call-process (append (list notmuch-command nil (list t t) nil) 
> args))
> + ? ? ?(goto-char (point-min))
> + ? ? ?(if (re-search-forward "^$" nil t)
> + ? ? ? ? (save-excursion
> + ? ? ? ? ? (save-restriction
> + ? ? ? ? ? ? (narrow-to-region (point-min) (point))
> + ? ? ? ? ? ? (goto-char (point-min))
> + ? ? ? ? ? ? (setq headers (mail-header-extract))))
> + ? ? ? ? )
> + ? ? ?(forward-line 1)
> + ? ? ?(setq body (buffer-substring (point) (point-max)))
> + ? ? ?)
> +
> + ? ?(let ((message-signature nil))
> + ? ? ?(notmuch-mua-mail (mail-header 'to headers)
> + ? ? ? ? ? ? ? ? ? ? ? (mail-header 'subject headers)
> + ? ? ? ? ? ? ? ? ? ? ? (message-headers-to-generate headers t '(to subject))
> + ? ? ? ? ? ? ? ? ? ? ? t nil nil (notmuch-mua-delete-postponed query-string))
> + ? ?)
> +
> + ? ?;; insert the message body - but put it in front of the signature
> + ? ?;; if one is present
> + ? ?(goto-char (point-max))
> + ? ?(if (re-search-backward message-signature-separator nil t)
> + ? ? ? ? (forward-line -1)
> + ? ? ?(goto-char (point-max)))
> + ? ?(insert body))
> + ?(set-buffer-modified-p nil)
> +
> + ?(message-goto-body))
> +
> ?(defun notmuch-mua-new-forward-message (&optional prompt-for-sender)
> ? "Invoke the notmuch message forwarding window.
>
> diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
> index c83b992..1efde1c 100644
> --- a/emacs/notmuch-show.el
> +++ b/emacs/notmuch-show.el
> @@ -865,6 +865,7 @@ function is used. "
> ? ? ? ?(define-key map "m" 'notmuch-mua-new-mail)
> ? ? ? ?(define-key map "f" 'notmuch-show-forward-message)
> ? ? ? ?(define-key map "r" 'notmuch-show-reply)
> + ? ? ? (define-key map "e" 'notmuch-show-edit)
> ? ? ? ?(define-key map "|" 'notmuch-show-pipe-message)
> ? ? ? ?(define-key map "w" 'notmuch-show-save-attachments)
> ? ? ? ?(define-key map "V" 'notmuch-show-view-raw-message)
> @@ -1165,6 +1166,11 @@ any effects from previous calls to
> ? (interactive "P")
> ? (notmuch-mua-new-reply (notmuch-show-get-message-id) prompt-for-sender))
>
> +(defun notmuch-show-edit ()
> + ?"Edit the current message as new."
> + ?(interactive)
> + ?(notmuch-mua-edit-mail (notmuch-show-get-message-id)))
> +
> ?(defun notmuch-show-forward-message (&optional prompt-for-sender)
> ? "Forward the current message."
> ? (interactive "P")
> diff --git a/emacs/notmuch.el b/emacs/notmuch.el
> index f6fb07b..b522715 100644
> --- a/emacs/notmuch.el
> +++ b/emacs/notmuch.el
> @@ -204,6 +204,7 @@ For a mouse binding, return nil."
> ? ? (define-key map "p" 'notmuch-search-previous-thread)
> ? ? (define-key map "n" 'notmuch-search-next-thread)
> ? ? (define-key map "r" 'notmuch-search-reply-to-thread)
> + ? ?(define-key map "e" 'notmuch-search-edit)
> ? ? (define-key map "m" 'notmuch-mua-new-mail)
> ? ? (define-key map "s" 'notmuch-search)
> ? ? (define-key map "o" 'notmuch-search-toggle-order)
> @@ -449,6 +450,12 @@ Complete list of currently available key bindings:
> ? (let ((message-id (notmuch-search-find-thread-id)))
> ? ? (notmuch-mua-new-reply message-id prompt-for-sender)))
>
> +(defun notmuch-search-edit ()
> + ?"Edit the current message as new."
> + ?(interactive)
> + ?(let ((message-id (notmuch-search-find-thread-id)))
> + ? ?(notmuch-mua-edit-mail message-id)))
> +
> ?(defun notmuch-call-notmuch-process (&rest args)
> ? "Synchronously invoke \"notmuch\" with the given list of arguments.
>
> --
> 1.7.5.4
>
> _______________________________________________
> notmuch mailing list
> notmuch at notmuchmail.org
> http://notmuchmail.org/mailman/listinfo/notmuch
>

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