How to change encoding temporarily?

How to change encoding temporarily?

[ssSslang]

Hi there!

I use Gnus with utf-8 encoding. Now I find the suck microsoft hotmail
webmail can't decode my mail correctly. So I must change to another
encoding(gbk) when sending mail to those who use hotmail mail box.

Everytime I just write in my buffer with:

(setq mm-coding-system-priorities '(iso-8859-1 gbk utf-8))

eval it, send mail, and then roll back. I thought of binding these two
functions to some keys. But I often forget to do these before sending
mail. Is it a hook related to mail address can be use for sending mail?

-- 
ssSslang

Re: How to change encoding temporarily?

[Reiner Steib]

On Fri, Nov 17 2006, ssSslang wrote:

> Is it a hook related to mail address can be use for sending mail?

,----[ M-x apropos-variable RET message.*send.*hook RET ]
| message-send-hook
|   Variable: Hook run before sending messages.
| message-send-mail-hook
|   Variable: Hook run before sending mail messages.
| message-send-news-hook
|   Variable: Hook run before sending news messages.
`----

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

Re: How to change encoding temporarily?

[ssSslang]

Reiner Steib <reinersteib+gmane@imap.cc> writes:

>> Is it a hook related to mail address can be use for sending mail?
>
> ,----[ M-x apropos-variable RET message.*send.*hook RET ]
> | message-send-hook
> |   Variable: Hook run before sending messages.
> | message-send-mail-hook
> |   Variable: Hook run before sending mail messages.
> | message-send-news-hook
> |   Variable: Hook run before sending news messages.
> `----

Thank you, Reiner. I saw these hooks, but they're not related to mail
address. Do you mean I should write a function to select the encoding
according to the From header, and then bind it to the hook?

-- 
ssSslang

Re: How to change encoding temporarily?

[Brep]

ssSslang <sssslang@163.com.removeme> writes:

> Thank you, Reiner. I saw these hooks, but they're not related to mail
> address. Do you mean I should write a function to select the encoding
> according to the From header, and then bind it to the hook?

Try this:

(add-hook 'message-send-hook 'change-charset)
(defun change-charset ()
  (when (message-mail-p)
    (if (string-match "hotmail" (mail-fetch-field "to"))
	(setq mm-coding-system-priorities
	      '(iso-8859-1 gbk utf-8))
      (setq mm-coding-system-priorities
	    '(iso-8859-1 utf-8)))))

Re: How to change encoding temporarily?

[Reiner Steib]

On Fri, Nov 17 2006, Brep wrote:

> ssSslang <sssslang@163.com.removeme> writes:
>
>> Thank you, Reiner. I saw these hooks, but they're not related to mail
>> address. Do you mean I should write a function to select the encoding
>> according to the From header, and then bind it to the hook?
>
> Try this:
>
> (add-hook 'message-send-hook 'change-charset)
> (defun change-charset ()
>   (when (message-mail-p)
>     (if (string-match "hotmail" (mail-fetch-field "to"))
> 	(setq mm-coding-system-priorities
> 	      '(iso-8859-1 gbk utf-8))
>       (setq mm-coding-system-priorities
> 	    '(iso-8859-1 utf-8)))))

I'd suggest something like this (barely tested):

--8<---------------cut here---------------start------------->8---
(setq sssslang-message-change-charset-regexp "@hotmail\\.com\\>")
(setq mm-coding-system-priorities '(iso-8859-1 utf-8)))))
(add-hook 'message-send-mail-hook 'sssslang-message-change-charset)
(defun sssslang-message-change-charset ()
  (save-restriction
    (message-narrow-to-headers)
    (when (or (string-match sssslang-message-change-charset-regexp
			    (or (message-fetch-field "to") ""))
	      (string-match sssslang-message-change-charset-regexp
			    (or (message-fetch-field "cc") ""))
	      (string-match sssslang-message-change-charset-regexp
			    (or (message-fetch-field "bcc") "")))
      (set (make-local-variable 'mm-coding-system-priorities)
	   '(iso-8859-1 gbk utf-8)))))
--8<---------------cut here---------------end--------------->8---

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

Re: How to change encoding temporarily?

[Zhang Wei]

Reiner Steib <reinersteib+gmane@imap.cc> writes:

> I'd suggest something like this (barely tested):
>
> --8<---------------cut here---------------start------------->8---
> (setq sssslang-message-change-charset-regexp "@hotmail\\.com\\>")
> (setq mm-coding-system-priorities '(iso-8859-1 utf-8)))))
> (add-hook 'message-send-mail-hook 'sssslang-message-change-charset)
> (defun sssslang-message-change-charset ()
>   (save-restriction
>     (message-narrow-to-headers)
>     (when (or (string-match sssslang-message-change-charset-regexp
> 			    (or (message-fetch-field "to") ""))
> 	      (string-match sssslang-message-change-charset-regexp
> 			    (or (message-fetch-field "cc") ""))
> 	      (string-match sssslang-message-change-charset-regexp
> 			    (or (message-fetch-field "bcc") "")))
>       (set (make-local-variable 'mm-coding-system-priorities)
> 	   '(iso-8859-1 gbk utf-8)))))
> --8<---------------cut here---------------end--------------->8---

Good argument, but there's two subtle details should be point out,

first, we couldn't do this:

(set (make-local-variable 'mm-coding-system-priorities)
     '(iso-8859-1 gbk utf-8))

It's a good idea to make a variable buffer local before change
it's value, but perhaps gnus makes a new buffer for the encoded
message, so if we don't change the global value of
`mm-coding-system-priorities', it won't take effect.

second, if we send mail through a SMTP server, be careful with
the message-send-mail-function, set it like this:

(setq message-send-mail-function 'message-smtpmail-send-it)

not,

(setq message-send-mail-function 'smtpmail-send-it)

otherwise the `message-send-mail-hook' won't run.

so something like this should cope with the problem:
 
--8<---------------cut here---------------start------------->8---
(setq sssslang-message-change-charset-regexp "@hotmail\\.com\\>")
(setq mm-coding-system-priorities '(iso-8859-1 utf-8))
(add-hook 'message-send-mail-hook 'sssslang-message-change-charset)
(defun sssslang-message-change-charset ()
  (save-restriction
    (message-narrow-to-headers)
    (if (or (string-match sssslang-message-change-charset-regexp
			    (or (message-fetch-field "to") ""))
	      (string-match sssslang-message-change-charset-regexp
			    (or (message-fetch-field "cc") ""))
	      (string-match sssslang-message-change-charset-regexp
			    (or (message-fetch-field "bcc") "")))
	(setq mm-coding-system-priorities
	      '(iso-8859-1 gbk utf-8))
      (setq mm-coding-system-priorities
	    '(iso-8859-1 utf-8)))))
--8<---------------cut here---------------end--------------->8---


-- 
荣华我已知庄梦
忠愤人将谓杞忧

Re: How to change encoding temporarily?

[ssSslang]

Thank you!

Zhang Wei <id.brep@gmail.com> writes:

> Good argument, but there's two subtle details should be point out,
> first, we couldn't do this:
>
> (set (make-local-variable 'mm-coding-system-priorities)
>      '(iso-8859-1 gbk utf-8))
>
> It's a good idea to make a variable buffer local before change
> it's value, but perhaps gnus makes a new buffer for the encoded
> message, so if we don't change the global value of
> `mm-coding-system-priorities', it won't take effect.

I did a test. Zhang Wei is right. The local variable is not work.

> second, if we send mail through a SMTP server, be careful with
> the message-send-mail-function, set it like this:
>
> (setq message-send-mail-function 'message-smtpmail-send-it)
>
> not,
>
> (setq message-send-mail-function 'smtpmail-send-it)
>
> otherwise the `message-send-mail-hook' won't run.

I use msmtp to send message, so it needn't to be changed. Thank you all
the same.

> so something like this should cope with the problem:
>
> --8<---------------cut here---------------start------------->8---
> (setq sssslang-message-change-charset-regexp "@hotmail\\.com\\>")
> (setq mm-coding-system-priorities '(iso-8859-1 utf-8))
> (add-hook 'message-send-mail-hook 'sssslang-message-change-charset)
> (defun sssslang-message-change-charset ()
>   (save-restriction
>     (message-narrow-to-headers)
>     (if (or (string-match sssslang-message-change-charset-regexp
> 			    (or (message-fetch-field "to") ""))
> 	      (string-match sssslang-message-change-charset-regexp
> 			    (or (message-fetch-field "cc") ""))
> 	      (string-match sssslang-message-change-charset-regexp
> 			    (or (message-fetch-field "bcc") "")))
> 	(setq mm-coding-system-priorities
> 	      '(iso-8859-1 gbk utf-8))
>       (setq mm-coding-system-priorities
> 	    '(iso-8859-1 utf-8)))))
> --8<---------------cut here---------------end--------------->8---

The truth is that when I first try this code, the GCCed mail's head
displays the gbk encoding, but, there's always a but, :) my hotmail mail
box also get a utf8 encoded mail. Then I go through the message.el to
find the reason(unfortunately, I know little about elisp), I saw the
follow two lines:

  (message-fix-before-sending)
  (run-hooks 'message-send-hook)

I remembered someone said Gnus holding text as utf8 and then convert to
another encoding before sending. So I look over the
(message-fix-before-sending) and guess this is the convert code. So I
exchanged the two lines and add the sssslang-message-change-charset to
the message-send-hook(because I cannot find the message-send-mail-hook).
It then works. I know this is a dirty way, so please let me know the
better solutions.

-- 
ssSslang