;;; org-mime.el --- org html export for text/html MIME emails
;; Copyright (C) 2010-2015 Eric Schulte
;; Author: Eric Schulte
;; Maintainer: Chen Bin (redguardtoo)
;; Keywords: mime, mail, email, html
;; Homepage: http://github.com/redguardtoo/org-mime
;; Version: 0.0.3
;; This file is not part of GNU Emacs.
;;; License:
;; This program 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, or (at your option)
;; any later version.
;;
;; This program 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 .
;;; Commentary:
;; WYSWYG, html mime composition using org-mode
;;
;; For mail composed using the orgstruct-mode minor mode, this
;; provides a function for converting all or part of your mail buffer
;; to embedded html as exported by org-mode. Call `org-mime-htmlize'
;; in a message buffer to convert either the active region or the
;; entire buffer to html.
;;
;; Similarly the `org-mime-org-buffer-htmlize' function can be called
;; from within an org-mode buffer to convert the buffer to html, and
;; package the results into an email handling with appropriate MIME
;; encoding.
;;
;; Quick start:
;; Write mail in message-mode, make sure the mail body follows org format.
;; Before sending mail, `M-x org-mime-htmlize'
;;
;; Setup (OPTIONAL):
;; you might want to bind this to a key with something like the
;; following message-mode binding
;;
;; (add-hook 'message-mode-hook
;; (lambda ()
;; (local-set-key (kbd "C-c M-o") 'org-mime-htmlize)))
;;
;; and the following org-mode binding
;;
;; (add-hook 'org-mode-hook
;; (lambda ()
;; (local-set-key (kbd "C-c M-o") 'org-mime-org-buffer-htmlize)))
;;; Code:
(eval-when-compile
(require 'cl))
(require 'org)
(defcustom org-mime-default-header
"#+OPTIONS: latex:t toc:nil H:3\n"
"Default header to control html export options, and ensure
first line isn't assumed to be a title line."
:group 'org-mime
:type 'string)
(defcustom org-mime-library 'mml
"Library to use for marking up MIME elements."
:group 'org-mime
:type '(choice 'mml 'semi 'vm))
(defcustom org-mime-preserve-breaks t
"Used as temporary value of `org-export-preserve-breaks' during
mime encoding."
:group 'org-mime
:type 'boolean)
(defcustom org-mime-fixedwith-wrap
"\n%s
\n"
"Format string used to wrap a fixedwidth HTML email."
:group 'org-mime
:type 'string)
(defvar org-mime-html-hook nil
"Hook to run over the html buffer before attachment to email.
This could be used for example to post-process html elements.")
(defvar org-mime-pre-html-hook nil
"Hook to run before html export.
Functions should take no arguments and will be run in a
buffer holding\nthe text to be exported.")
(defvar org-mime-send-buffer-hook nil
"Hook to run in the Org-mode file before export.")
(defun org-mime--export-string (s)
(if (fboundp 'org-export-string-as)
;; emacs24
(org-export-string-as s 'html t)
;; emacs 23
(org-export-string s "html")))
;; example hook, for setting a dark background in elements
(defun org-mime-change-element-style (element style)
"Set new default htlm style for elements in exported html."
(while (re-search-forward (format "<%s" element) nil t)
(replace-match (format "<%s style=\"%s\"" element style))))
(defun org-mime-change-class-style (class style)
"Set new default htlm style for objects with classs=CLASS in
exported html."
(while (re-search-forward (format "class=\"%s\"" class) nil t)
(replace-match (format "class=\"%s\" style=\"%s\"" class style))))
;; ;; example addition to `org-mime-html-hook' adding a dark background
;; ;; color to elements
;; (add-hook 'org-mime-html-hook
;; (lambda ()
;; (org-mime-change-element-style
;; "pre" (format "color: %s; background-color: %s;"
;; "#E6E1DC" "#232323"))
;; (org-mime-change-class-style
;; "verse" "border-left: 2px solid gray; padding-left: 4px;")))
(defun org-mime-file (ext path id)
"Markup a file for attachment."
(case org-mime-library
('mml (format (concat "<#part type=\"%s\" filename=\"%s\" "
"disposition=inline id=\"<%s>\">\n<#/part>\n")
ext path id))
('semi (concat
(format (concat "--[[%s\nContent-Disposition: "
"inline;\nContent-ID: <%s>][base64]]\n")
ext id)
(base64-encode-string
(with-temp-buffer
(set-buffer-multibyte nil)
(binary-insert-encoded-file path)
(buffer-string)))))
('vm "?")))
(defun org-mime-multipart (plain html &optional images)
"Markup a multipart/alternative with text/plain and text/html alternatives.
If the html portion of the message includes images wrap the html
and images in a multipart/related part."
(case org-mime-library
('mml (concat "<#multipart type=alternative><#part type=text/plain>"
plain
(when images "<#multipart type=related>")
"<#part type=text/html>"
html
images
(when images "<#/multipart>\n")
"<#/multipart>\n"))
('semi (concat
"--" "<>-{\n"
"--" "[[text/plain]]\n" plain
(when images (concat "--" "<>-{\n"))
"--" "[[text/html]]\n" html
images
(when images (concat "--" "}-<>\n"))
"--" "}-<>\n"))
('vm "?")))
(defun org-mime-replace-images (str current-file)
"Replace images in html files with cid links."
(let (html-images)
(cons
(replace-regexp-in-string ;; replace images in html
"src=\"\\([^\"]+\\)\""
(lambda (text)
(format
"src=\"cid:%s\""
(let* ((url (and (string-match "src=\"\\([^\"]+\\)\"" text)
(match-string 1 text)))
(path (expand-file-name
url (file-name-directory current-file)))
(ext (file-name-extension path))
(id (replace-regexp-in-string "[\/\\\\]" "_" path)))
(add-to-list 'html-images
(org-mime-file (concat "image/" ext) path id))
id)))
str)
html-images)))
(defun org-mime-htmlize (arg)
"Export a portion of an email body composed using `mml-mode' to
html using `org-mode'. If called with an active region only
export that region, otherwise export the entire body."
(interactive "P")
(let* ((region-p (org-region-active-p))
(html-start (or (and region-p (region-beginning))
(save-excursion
(goto-char (point-min))
(search-forward mail-header-separator)
(+ (point) 1))))
(html-end (or (and region-p (region-end))
;; TODO: should catch signature...
(point-max)))
(body (concat org-mime-default-header
(buffer-substring html-start html-end)))
(tmp-file (make-temp-name (expand-file-name
"mail" temporary-file-directory)))
;; because we probably don't want to export a huge style file
(org-export-htmlize-output-type 'inline-css)
;; makes the replies with ">"s look nicer
(org-export-preserve-breaks org-mime-preserve-breaks)
;; dvipng for inline latex because MathJax doesn't work in mail
(org-html-with-latex 'dvipng)
;; to hold attachments for inline html images
(html-and-images
(org-mime-replace-images
(org-mime--export-string body) tmp-file))
(html-images (unless arg (cdr html-and-images)))
(html (org-mime-apply-html-hook
(if arg
(format org-mime-fixedwith-wrap body)
(car html-and-images)))))
(delete-region html-start html-end)
(save-excursion
(goto-char html-start)
(insert (org-mime-multipart
body html (mapconcat 'identity html-images "\n"))))))
(defun org-mime-apply-html-hook (html)
(if org-mime-html-hook
(with-temp-buffer
(insert html)
(goto-char (point-min))
(run-hooks 'org-mime-html-hook)
(buffer-string))
html))
(defmacro org-mime-try (&rest body)
`(condition-case nil ,@body (error nil)))
(defun org-mime-send-buffer ()
(run-hooks 'org-mime-send-buffer-hook)
(let* ((region-p (org-region-active-p))
(subject (org-export-grab-title-from-buffer))
(file (buffer-file-name (current-buffer)))
(body-start (or (and region-p (region-beginning))
(save-excursion (goto-char (point-min)))))
(body-end (or (and region-p (region-end)) (point-max)))
(temp-body-file (make-temp-file "org-mime-export"))
(body (buffer-substring body-start body-end)))
(org-mime-compose body file nil subject)))
(defun org-mime-compose (body file &optional to subject headers)
(let* ((fmt 'html))
(unless (featurep 'message)
(require 'message))
(message-mail to subject headers nil)
(message-goto-body)
(flet ((bhook (body fmt)
(let ((hook 'org-mime-pre-html-hook))
(if (> (eval `(length ,hook)) 0)
(with-temp-buffer
(insert body)
(goto-char (point-min))
(eval `(run-hooks ',hook))
(buffer-string))
body))))
(let* ((org-link-file-path-type 'absolute)
;; we probably don't want to export a huge style file
(org-export-htmlize-output-type 'inline-css)
(html-and-images
(org-mime-replace-images
(org-mime--export-string (bhook body 'html)) file))
(images (cdr html-and-images))
(html (org-mime-apply-html-hook (car html-and-images))))
(insert (org-mime-multipart (org-babel-trim body) html)
(mapconcat 'identity images "\n"))))))
(defun org-mime-org-buffer-htmlize ()
"Create an email buffer containing the current org-mode file
exported to html and encoded in both html and in org formats as
mime alternatives."
(interactive)
(org-mime-send-buffer))
(provide 'org-mime)
;;; org-mime.el ends here