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Re: [Orgmode] using orgmode to send html mail?
From: |
David Maus |
Subject: |
Re: [Orgmode] using orgmode to send html mail? |
Date: |
Thu, 25 Mar 2010 22:17:36 +0100 |
User-agent: |
Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (Gojō) APEL/10.7 Emacs/24.0.50 (i486-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) |
Okay, took a look on the specs and attached is a memo on how an
implementation of org to MIME could be done. The MIME delimiters of
SEMI and mml are quite similar so there's already a generic function
that creates representation of a MIME message for both.
I've published this memo on Worg, too, occupying some space in
http://orgmode.org/worg/org-devel.php
The tasks at hand would be: find the functions that attach a file in
mime-edit-mode and mml-mode and look who they can be utilized.
Best
-- David
--
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Author: David Maus <address@hidden>
Date: 2010-03-25 21:56:50 CET
Table of Contents
=================
1 Representing a MIME internet message
2 MIME delimiters of SEMI and mml
3 Generic function
4 Open questions
4.1 How to handle charset information?
4.2 How to attach files?
5 Quotes from the specs
5.1 MIME multipart: Notion of structured, related body parts
5.2 MIME multipart: order of entities inside a multipart
1 Representing a MIME internet message
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
A MIME internet message consists of one or more MIME entities. Each
MIME entity is of a distinct type and subtype, has a body and
optional MIME headers related to it's content.
A MIME entity is represented as a list:
(TYPE SUBTYPE BODY CONT-HEAD)
TYPE: Symbol of MIME media type (e.g. text, video, audio).
SUBTYPE: Symbol of MIME media subtype (e.g. plain, html).
BODY: String with entity body -or- list of other MIME entities.
CONT-HEAD: List of cons with content related MIME header
fields. The name of the header field without the
prefix "Content-" is car, the value cdr.
Example:
'(text html "<h1>Headline</h1>" ((disposition . inline)))
For messages of type multipart the body consists of a list of one
or more MIME entities.
'(multipart alternative
'((text plain "* Headline")
(text html "<h1>headline</h1>")))
2 MIME delimiters of SEMI and mml
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The MIME delimiters are defined in an association list with a
symbol of the library's name as key and delimiter format strings as
values. For each library there are three formatstrings.
(SYMBOL DELIM-SINGLE DELIM-SINGLE-CONT DELIM-MULTI)
DELIM-SINGLE: Denoting a single MIME entity.
Strings are passed in this order:
1. type
2. subtype
3. content header
4. body
DELIM-SINGLE-CONT: Format of content header strings.
Strings are passed in this order:
1. header field name
2. header field value
DELIM-MULTI: Enclosing parts of a multipart entity.
Strings are passed in this order:
1. subtype
2. body
3. subtype
(setq org-mail-htmlize-mime-delimiter-alist
'((semi "\n- -[%s/%s%s]\n%s" "\ncontent-%s: %s" "\n- -<<%s>>-{\n%s\n-
-}-<<%s>>")
(mml "\n<#part type=\"%s/%s\"%s>\n%s" " %s=\"%s\"" "\n<#multipart
type=\"%s\">\n%s\n<#/multipart>")))
3 Generic function
~~~~~~~~~~~~~~~~~~~
This generic function returns a string representation with MIME
delimiters depending on the variable =org-mail-htmlize-mime-lib=.
(setq org-mail-htmlize-mime-lib 'semi)
(defun org-mail-htmlize-mime-entity (type subtype body
&optional cont-head)
"Return string representation of MIME entity.
TYPE is the type of entity body.
SUBTYPE is the subtype of body.
BODY is the body of the entity. Either a string with the body
content or a list with one ore more MIME entities.
Optional argument CONT-HEAD is a list of cons with content
specific headers, name in car and value in cdr."
(let ((delimlst (assoc org-mail-htmlize-mime-lib
org-mail-htmlize-mime-delimiter-alist)))
(if (eq type 'multipart)
(format (nth 3 delimlst) subtype
(mapconcat '(lambda (b)
(apply 'org-mail-htmlize-mime-entity
(car b) (cadr b) (cddr b)))
body "")
subtype)
(format (nth 1 delimlst)
type subtype
(mapconcat '(lambda (h)
(format (nth 2 delimlst) (car h) (cdr h)))
cont-head "")
body))))
4 Open questions
~~~~~~~~~~~~~~~~~
4.1 How to handle charset information?
=======================================
4.2 How to attach files?
=========================
The generic function expects BODY either be a string or a list.
Attaching binary file (image, etc.) requires to encode it so the
message will pass the message system. So we /might/ use kind of a
encoder (e.g. base64) on our own.
Or, what seems a cleaner solution: Use attachment function of the
respective MIME mode. To achive this: Introduce third possibility
for BODY: A cons with the filename in car and symbol of the
function in cdr.
(FILENAME . FUNCTION)
'(image jpeg ("/path/to/image" . org-mail-htmlize-add-attachment))
The function =org-mail-htmlize-add-attachment= is called with file
name as argument and calls the appropriate function depending on
=org-mail-htmlize-mime-lib= and returns a string
- with the encoded body
-or-
- the complete MIME entity
Side effect: The user might be prompted for attachment settings
(e.g. encoding). But, on the other hand: We delegate the job of
creating the attachment to the library that is responsible for
mime.
5 Quotes from the specs
~~~~~~~~~~~~~~~~~~~~~~~~
5.1 MIME multipart: Notion of structured, related body parts
=============================================================
- [RFC2046, 5.1.1]
ORG-BLOCKQUOTE-START
NOTE: Conspicuously missing from the "multipart" type is a notion of
structured, related body parts. It is recommended that those wishing
to provide more structured or integrated multipart messaging
facilities should define subtypes of multipart that are syntactically
identical but define relationships between the various parts. For
example, subtypes of multipart could be defined that include a
distinguished part which in turn is used to specify the relationships
between the other parts, probably referring to them by their
Content-ID field. Old implementations will not recognize the new
subtype if this approach is used, but will treat it as
multipart/mixed and will thus be able to show the user the parts that
are recognized.
ORG-BLOCKQUOTE-END
[RFC2046, 5.1.1]: http://tools.ietf.org/html/rfc2046.html#section-5.1.1
5.2 MIME multipart: order of entities inside a multipart
=========================================================
- [RFC2046, 5.1.3]
ORG-BLOCKQUOTE-START
5.1.3. Mixed Subtype
The "mixed" subtype of "multipart" is intended for use when the body
parts are independent and need to be bundled in a particular order.
Any "multipart" subtypes that an implementation does not recognize
must be treated as being of subtype "mixed".
ORG-BLOCKQUOTE-END
- [RFC2046, 5.1.4]
ORG-BLOCKQUOTE-START
5.1.4. Alternative Subtype
The "multipart/alternative" type is syntactically identical to
"multipart/mixed", but the semantics are different. In particular,
each of the body parts is an "alternative" version of the same
information.
Systems should recognize that the content of the various parts are
interchangeable. Systems should choose the "best" type based on the
local environment and references, in some cases even through user
interaction. As with "multipart/mixed", the order of body parts is
significant. In this case, the alternatives appear in an order of
increasing faithfulness to the original content. In general, the
best choice is the LAST part of a type supported by the recipient
system's local environment.
ORG-BLOCKQUOTE-END
ORG-BLOCKQUOTE-START
In general, user agents that compose "multipart/alternative" entities
must place the body parts in increasing order of preference, that is,
with the preferred format last. For fancy text, the sending user
agent should put the plainest format first and the richest format
last. Receiving user agents should pick and display the last format
they are capable of displaying. In the case where one of the
alternatives is itself of type "multipart" and contains unrecognized
sub-parts, the user agent may choose either to show that alternative,
an earlier alternative, or both.
ORG-BLOCKQUOTE-END
[RFC2046, 5.1.3]: http://tools.ietf.org/html/rfc2046.html#section-5.1.3
[RFC2046, 5.1.4]: http://tools.ietf.org/html/rfc2046.html#section-5.1.4
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- [Orgmode] using orgmode to send html mail?, Matt Price, 2010/03/21
- [Orgmode] Re: using orgmode to send html mail?, Matt Price, 2010/03/22
- Re: [Orgmode] using orgmode to send html mail?, David Maus, 2010/03/22
- Re: [Orgmode] using orgmode to send html mail?, Eric Schulte, 2010/03/23
- Re: [Orgmode] using orgmode to send html mail?, Xiao-Yong Jin, 2010/03/23
- Re: [Orgmode] using orgmode to send html mail?, Eric Schulte, 2010/03/24
- Re: [Orgmode] using orgmode to send html mail?, Dan Davison, 2010/03/24
- Re: [Orgmode] using orgmode to send html mail?, Eric Schulte, 2010/03/24
- Re: [Orgmode] using orgmode to send html mail?, David Maus, 2010/03/24
- Re: [Orgmode] using orgmode to send html mail?, Eric Schulte, 2010/03/24
- Re: [Orgmode] using orgmode to send html mail?,
David Maus <=
- Re: [Orgmode] using orgmode to send html mail?, Eric Schulte, 2010/03/26
- Re: [Orgmode] using orgmode to send html mail?, David Maus, 2010/03/26
- Re: [Orgmode] using orgmode to send html mail?, Eric Schulte, 2010/03/26
- Re: [Orgmode] [CONTRIB?] using orgmode to send html mail?, Eric Schulte, 2010/03/31
- Re: [Orgmode] [CONTRIB?] using orgmode to send html mail?, Dan Davison, 2010/03/31
- Re: [Orgmode] [CONTRIB?] using orgmode to send html mail?, Eric Schulte, 2010/03/31
- Re: [Orgmode] [CONTRIB?] using orgmode to send html mail?, Dan Davison, 2010/03/31
- Re: [Orgmode] using orgmode to send html mail?, David Maus, 2010/03/31
- Re: [Orgmode] using orgmode to send html mail?, Eric Schulte, 2010/03/31