delayed sending of mail

delayed sending of mail

[Kevin Brubeck Unhammer]

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Hi, 

someone on IRC asked about how to make a function that delays sending of
email, so as to have a chance to edit/cancel within 2 minutes or so. I
came up with

  (defun message-wait-send-and-exit (&optional arg)
    "Bury the buffer and wait a bit, then send message like
  `message-send-and-exit'."
    (interactive "P")
    (let ((timeout "2 minutes")
          (buf (current-buffer)))
      (message "Sending %s in %s" buf timeout)
      (bury-buffer)
      (run-at-time timeout
  		 nil
  		 (lambda (arg buf)
  		   (when (buffer-live-p buf)
  		     (with-current-buffer buf
  		       (let ((inhibit-quit nil)) ; avoid hang if e.g. server is slow/down
  		                                 ; though this makes C-g dangerous
  			 (message-send-and-exit arg)))))
  		 arg
  		 buf)))
  
but I know it's fraught with problems (missing headers cause
interactive questions to pop up out of nowhere, a C-g at the wrong
moment will cancel sending).

Has anyone attempted something like this before? I guess to avoid the
problem of interactive questions you'd have to write your own version of
`message-send' and do the `run-at-time' there. Perhaps `with-timeout'
could be used along with inhibit-quit to avoid stray C-g's while still
not hanging on server trouble? (Or is this a much bigger project than
that?)

-- 
Kevin Brubeck Unhammer

GPG: 0x766AC60C

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Re: delayed sending of mail

[Adam Sjøgren]

On Wed, 22 Aug 2012 15:06:26 +0200, Kevin wrote:

> someone on IRC asked about how to make a function that delays sending of
> email, so as to have a chance to edit/cancel within 2 minutes or so.

When I want delayed sending of an email/article, instead of using C-c
C-c to send it, I go C-c C-j (which is bound to gnus-delay-article).

Then I am prompted about how long to delay it, or when to send it. After
answering that, the email shows up in nndraft:delayed until the set
time, when it is sent.

In my .gnus I have these things to make it work:

    ; Activate delayed messages:
    (gnus-delay-initialize)

    ; Show X-Now-Playing and X-Gnus-Delayed header:
    (setq gnus-visible-headers (concat gnus-visible-headers "\\|^X-Now-Playing:\\|X-Gnus-Delayed:"))

    ; Remove date, so delayed messages (C-c C-j) don't get a date until
    ; sent <mailman.1180.1266014215.14305.info-gnus-english@gnu.org>:
    (setq message-draft-headers '(References From))

Only the first one is essential, I think. Oh, and the documentation of
gnus-delay-article says that delayed messages are sent after new news is
fetched, which means that these lines in my .gnus:

    ; Demon to fetch email every 5 minutes when Emacs has been idle for 5 minutes:
    (gnus-demon-add-handler 'gnus-demon-scan-news 5 5)
    (gnus-demon-init)

probably are essential as well. (And sending is potentially ~5 minutes
off.)

Maybe you can build upon gnus-delay-article if you want a fixed delay?


  Best regards,

    Adam

-- 
 "A cat has nine lives, but a bullfrog croaks                 Adam Sjøgren
  every day."                                            asjo@koldfront.dk

Re: delayed sending of mail

[Adam Sjøgren]

On Wed, 22 Aug 2012 23:00:21 +0200, Adam wrote:

> Maybe you can build upon gnus-delay-article if you want a fixed delay?

I should have offered a link to the manual as well, it has more detail:

 * http://gnus.org/manual/gnus_75.html


  Best regards,

    Adam

-- 
 "A cat has nine lives, but a bullfrog croaks                 Adam Sjøgren
  every day."                                            asjo@koldfront.dk

Re: delayed sending of mail

[Kevin Brubeck Unhammer]

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asjo@koldfront.dk (Adam Sjøgren) writes:

> On Wed, 22 Aug 2012 15:06:26 +0200, Kevin wrote:
>
>> someone on IRC asked about how to make a function that delays sending of
>> email, so as to have a chance to edit/cancel within 2 minutes or so.
>
> When I want delayed sending of an email/article, instead of using C-c
> C-c to send it, I go C-c C-j (which is bound to gnus-delay-article).
>
> Then I am prompted about how long to delay it, or when to send it. After
> answering that, the email shows up in nndraft:delayed until the set
> time, when it is sent.
>
> In my .gnus I have these things to make it work:
>
>     ; Activate delayed messages:
>     (gnus-delay-initialize)
>
>     ; Show X-Now-Playing and X-Gnus-Delayed header:
>     (setq gnus-visible-headers (concat gnus-visible-headers "\\|^X-Now-Playing:\\|X-Gnus-Delayed:"))
>
>     ; Remove date, so delayed messages (C-c C-j) don't get a date until
>     ; sent <mailman.1180.1266014215.14305.info-gnus-english@gnu.org>:
>     (setq message-draft-headers '(References From))
>
> Only the first one is essential, I think. Oh, and the documentation of
> gnus-delay-article says that delayed messages are sent after new news is
> fetched, which means that these lines in my .gnus:
>
>     ; Demon to fetch email every 5 minutes when Emacs has been idle for 5 minutes:
>     (gnus-demon-add-handler 'gnus-demon-scan-news 5 5)
>     (gnus-demon-init)
>
> probably are essential as well. (And sending is potentially ~5 minutes
> off.)
>
> Maybe you can build upon gnus-delay-article if you want a fixed delay?

Thanks, Adam and Reiner, I should've guessed it was solved already :)


I prefer a shorter demon timeout for this purpose, but I don't need the
full news scan, so I used

    (gnus-demon-add-handler 'gnus-delay-send-queue 1 nil) ; call every other minute regardless of idleness
    (gnus-demon-init)

And for the actual sending, in case anyone's interested:

    (defvar message-delayed-send-default-minutes 2
      "Default delay in minutes before delayed-sending with `message-delayed-send-and-exit'")

    (defun message-delayed-send-and-exit ()
      "Use `gnus-delay-article' to send after
    `message-delayed-send-default-minutes' minutes."
      (interactive)
      (message "Sending in %s minutes" message-delayed-send-default-minutes)
      (gnus-delay-article (format "%sm" message-delayed-send-default-minutes)))

    (define-key message-mode-map (kbd "C-c C-c") 'message-delayed-send-and-exit)

And in case I exit gnus before it's sent, I added:

    (defun gnus-delay-send-queue-hurry ()
      "As `gnus-delay-send-queue, but also send anything that is to
    be sent within `message-delayed-send-default-minutes minutes."
      (interactive)
      (save-excursion
        (let* ((group (format "nndraft:%s" gnus-delay-group))
    	   (message-send-hook (copy-sequence message-send-hook))
    	   articles
    	   article deadline)
          (when (gnus-group-entry group)
    	(gnus-activate-group group)
    	(add-hook 'message-send-hook
    		  (lambda () (message-remove-header gnus-delay-header)))
    	(setq articles (nndraft-articles))
    	(while (setq article (pop articles))
    	  (gnus-request-head article group)
    	  (set-buffer nntp-server-buffer)
    	  (goto-char (point-min))
    	  (if (re-search-forward
    	       (concat "^" (regexp-quote gnus-delay-header) ":\\s-+")
    	       nil t)
    	      (progn
    		(setq deadline (nnheader-header-value))
    		(setq deadline (apply 'encode-time
    				      (parse-time-string deadline)))
    		;; The difference:
		(setq deadline (time-subtract
				deadline
				(seconds-to-time
				 (* 60 message-delayed-send-default-minutes))))
    		(setq deadline (time-since deadline))
    		(when (and (>= (nth 0 deadline) 0)
    			   (>= (nth 1 deadline) 0))
    		  (message "Sending delayed article %d" article)
    		  (gnus-draft-send article group)
    		  (message "Sending delayed article %d...done" article)))
    	    (message "Delay header missing for article %d" article)))))))
    
    (add-hook 'gnus-exit-gnus-hook 'gnus-delay-send-queue-hurry)


(I guess another possibility would be to first go through nndraft and
alter the header, then call `gnus-delay-send-queue', but most of that
function consists of finding delayed articles anyway …)

-- 
Kevin Brubeck Unhammer

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Re: delayed sending of mail

[Adam Sjøgren]

On Thu, 23 Aug 2012 11:04:08 +0200, Kevin wrote:

> I prefer a shorter demon timeout for this purpose, but I don't need the
> full news scan, so I used

>     (gnus-demon-add-handler 'gnus-delay-send-queue 1 nil) ; call every other minute regardless of idleness
>     (gnus-demon-init)

Ah, cool, I will steal that - thanks for sharing (this and the rest)!


  Best regards,

    Adam

-- 
 "A cat has nine lives, but a bullfrog croaks                 Adam Sjøgren
  every day."                                            asjo@koldfront.dk

Re: delayed sending of mail

[Reiner Steib]

On Wed, Aug 22 2012, Kevin Brubeck Unhammer wrote:

> someone on IRC asked about how to make a function that delays sending of
> email, so as to have a chance to edit/cancel within 2 minutes or so.

See (info "(gnus)Delayed Articles")

Bye, Reiner.
-- 
       ,,,
      (o o)
---ooO-(_)-Ooo---  |  PGP key available  |  http://rsteib.home.pages.de/