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|
;;; mu4e-message.el -- part of mu4e, the mu mail user agent
;;
;; Copyright (C) 2012-2016 Dirk-Jan C. Binnema
;; Author: Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
;; Maintainer: Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
;; This file is not part of GNU Emacs.
;;
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Functions to get data from mu4e-message plist structure
;;; Code:
(eval-when-compile (byte-compile-disable-warning 'cl-functions))
(require 'mu4e-vars)
(require 'mu4e-utils)
(require 'cl)
(require 'html2text)
(defcustom mu4e-html2text-command
(if (fboundp 'shr-insert-document) 'mu4e-shr2text 'html2text)
"Either a shell command or a function that converts from html to plain text.
If it is a shell-command, the command reads html from standard
input and outputs plain text on standard output. If you use the
htmltext program, it's recommended you use \"html2text -utf8
-width 72\". Alternatives are the python-based html2markdown, w3m
and on MacOS you may want to use textutil.
It can also be a function, which takes the current buffer in html
as input, and transforms it into html (like the `html2text'
function).
In both cases, the output is expected to be in UTF-8 encoding.
Newer emacs has the shr renderer, and when its available,
conversion defaults `mu4e-shr2text'; otherwise, the default is
emacs' built-in `html2text' function."
:type '(choice string function)
:group 'mu4e-view)
(defcustom mu4e-view-prefer-html nil
"Whether to base the body display on the html-version.
If the e-mail message has no html-version the plain-text version
is always used."
:type 'boolean
:group 'mu4e-view)
(defcustom mu4e-view-html-plaintext-ratio-heuristic 5
"Ratio between the length of the html and the plain text part
below which mu4e will consider the plain text part to be 'This
messages requires html' text bodies."
:type 'integer
:group 'mu4e-view)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defsubst mu4e-message-field-raw (msg field)
"Retrieve FIELD from message plist MSG.
FIELD is one of :from, :to, :cc, :bcc, :subject, :data,
:message-id, :path, :maildir, :priority, :attachments,
:references, :in-reply-to, :body-txt, :body-html
Returns `nil' if the field does not exist.
A message plist looks something like:
\(:docid 32461
:from ((\"Nikola Tesla\" . \"niko@example.com\"))
:to ((\"Thomas Edison\" . \"tom@example.com\"))
:cc ((\"Rupert The Monkey\" . \"rupert@example.com\"))
:subject \"RE: what about the 50K?\"
:date (20369 17624 0)
:size 4337
:message-id \"6BDC23465F79238C8233AB82D81EE81AF0114E4E74@123213.mail.example.com\"
:path \"/home/tom/Maildir/INBOX/cur/133443243973_1.10027.atlas:2,S\"
:maildir \"/INBOX\"
:priority normal
:flags (seen)
:attachments
((:index 2 :name \"photo.jpg\" :mime-type \"image/jpeg\" :size 147331)
(:index 3 :name \"book.pdf\" :mime-type \"application/pdf\" :size 192220))
:references (\"6BDC23465F79238C8384574032D81EE81AF0114E4E74@123213.mail.example.com\"
\"6BDC23465F79238203498230942D81EE81AF0114E4E74@123213.mail.example.com\")
:in-reply-to \"6BDC23465F79238203498230942D81EE81AF0114E4E74@123213.mail.example.com\"
:body-txt \"Hi Tom, ...\"
\)).
Some notes on the format:
- The address fields are lists of pairs (NAME . EMAIL), where NAME can be nil.
- The date is in format emacs uses in `current-time'
- Attachments are a list of elements with fields :index (the number of
the MIME-part), :name (the file name, if any), :mime-type (the
MIME-type, if any) and :size (the size in bytes, if any).
- Messages in the Headers view come from the database and do not have
:attachments, :body-txt or :body-html fields. Message in the
Message view use the actual message file, and do include these fields."
;; after all this documentation, the spectacular implementation
(if msg
(plist-get msg field)
(mu4e-error "message must be non-nil")))
(defsubst mu4e-message-field (msg field)
"Retrieve FIELD from message plist MSG.
Like `mu4e-message-field-nil', but will sanitize `nil' values:
- all string field except body-txt/body-html: nil -> \"\"
- numeric fields + dates : nil -> 0
- all others : return the value
Thus, function will return nil for empty lists, non-existing body-txt or body-html."
(let ((val (mu4e-message-field-raw msg field)))
(cond
(val
val) ;; non-nil -> just return it
((member field '(:subject :message-id :path :maildir :in-reply-to))
"") ;; string fields except body-txt, body-html: nil -> ""
((member field '(:body-html :body-txt))
val)
((member field '(:docid :size))
0) ;; numeric type: nil -> 0
(t
val)))) ;; otherwise, just return nil
(defsubst mu4e-message-has-field (msg field)
"Return t if MSG contains FIELD, nil otherwise."
(plist-member msg field))
(defsubst mu4e-message-at-point (&optional noerror)
"Get the message s-expression for the message at point in either
the headers buffer or the view buffer, or nil if there is no such
message. If optional NOERROR is non-nil, do not raise an error when
there is no message at point."
(let ((msg (or (get-text-property (point) 'msg) mu4e~view-msg)))
(if msg
msg
(unless noerror (mu4e-warn "No message at point")))))
(defsubst mu4e-message-field-at-point (field)
"Get the field FIELD from the message at point.
This is equivalent to:
(mu4e-message-field (mu4e-message-at-point) FIELD)."
(mu4e-message-field (mu4e-message-at-point) field))
(defun mu4e-message-body-text (msg)
"Get the body in text form for this message.
This is either :body-txt, or if not available, :body-html converted
to text, using `mu4e-html2text-command' is non-nil, it will use
that. Normally, thiss function prefers the text part, but this can
be changed by setting `mu4e-view-prefer-html'."
(let* ((txt (mu4e-message-field msg :body-txt))
(html (mu4e-message-field msg :body-html))
(body
(cond
;; does it look like some text? ie., if the text part is more than
;; mu4e-view-html-plaintext-ratio-heuristic times shorter than the
;; html part, it should't be used
;; This is an heuristic to guard against 'This messages requires
;; html' text bodies.
((and (> (* mu4e-view-html-plaintext-ratio-heuristic
(length txt)) (length html))
;; use html if it's prefered, unless there is no html
(or (not mu4e-view-prefer-html) (not html)))
txt)
;; otherwise, it there some html?
(html
(with-temp-buffer
(insert html)
(cond
((stringp mu4e-html2text-command)
(let* ((tmp-file (mu4e-make-temp-file "html")))
(write-region (point-min) (point-max) tmp-file)
(erase-buffer)
(call-process-shell-command mu4e-html2text-command tmp-file t t)
(delete-file tmp-file)))
((functionp mu4e-html2text-command)
(funcall mu4e-html2text-command))
(t (mu4e-error "Invalid `mu4e-html2text-command'")))
(buffer-string))
)
(t ;; otherwise, an empty body
""))))
;; and finally, remove some crap from the remaining string; it seems
;; esp. outlook lies about its encoding (ie., it says 'iso-8859-1' but
;; really it's 'windows-1252'), thus giving us these funky chars. here, we
;; either remove them, or replace with 'what-was-meant' (heuristically)
(with-temp-buffer
(insert body)
(goto-char (point-min))
(while (re-search-forward "[
’]" nil t)
(replace-match
(cond
((string= (match-string 0) "’") "'")
(t ""))))
(buffer-string))))
(defun mu4e-message-contact-field-matches (msg cfield rx)
"Checks whether any of the of the contacts in field
CFIELD (either :to, :from, :cc or :bcc, or a list of those) of
msg MSG matches (with their name or e-mail address) regular
expressions RX. If there is a match, return non-nil; otherwise
return nil. RX can also be a list of regular expressions, in
which case any of those are tried for a match."
(if (and cfield (listp cfield))
(or (mu4e-message-contact-field-matches msg (car cfield) rx)
(mu4e-message-contact-field-matches msg (cdr cfield) rx))
(when cfield
(if (listp rx)
;; if rx is a list, try each one of them for a match
(find-if
(lambda (a-rx) (mu4e-message-contact-field-matches msg cfield a-rx))
rx)
;; not a list, check the rx
(find-if
(lambda (ct)
(let ((name (car ct)) (email (cdr ct)))
(or
(and name (string-match rx name))
(and email (string-match rx email)))))
(mu4e-message-field msg cfield))))))
(defun mu4e-message-contact-field-matches-me (msg cfield)
"Checks whether any of the of the contacts in field
CFIELD (either :to, :from, :cc or :bcc) of msg MSG matches *me*,
that is, any of the e-mail address in
`mu4e-user-mail-address-list'. Returns the contact cell that
matched, or nil."
(find-if
(lambda (cc-cell)
(member-if
(lambda (addr)
(string= (downcase addr) (downcase (cdr cc-cell))))
mu4e-user-mail-address-list))
(mu4e-message-field msg cfield)))
(defsubst mu4e-message-part-field (msgpart field)
"Get some field in a message part; a part would look something like:
(:index 2 :name \"photo.jpg\" :mime-type \"image/jpeg\" :size 147331)."
(plist-get msgpart field))
;; backward compatibility ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defalias 'mu4e-msg-field 'mu4e-message-field)
(defalias 'mu4e-body-text 'mu4e-message-body-text) ;; backward compatibility
(defun mu4e-field-at-point (field)
"Get FIELD (a symbol, see `mu4e-header-info') for the message at
point in eiter the headers buffer or the view buffer."
(plist-get (mu4e-message-at-point) field))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun mu4e-shr2text ()
"Html to text using the shr engine; this can be used in
`mu4e-html2text-command' in a new enough emacs. Based on code by
Titus von der Malsburg."
(interactive)
(let ((dom (libxml-parse-html-region (point-min) (point-max)))
;; When HTML emails contain references to remote images,
;; retrieving these images leaks information. For example,
;; the sender can see when I openend the email and from which
;; computer (IP address). For this reason, it is preferrable
;; to not retrieve images.
;; See this discussion on mu-discuss:
;; https://groups.google.com/forum/#!topic/mu-discuss/gr1cwNNZnXo
(shr-inhibit-images t))
(erase-buffer)
(shr-insert-document dom)
(goto-char (point-min))))
(provide 'mu4e-message)
|
