2010-04-09 12:14:05 -04:00
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;;; org-mime.el --- org html export for text/html MIME emails
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;; Copyright (C) 2010 Eric Schulte
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;; Author: Eric Schulte
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;; Keywords: mime, mail, email, html
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;; Homepage: http://orgmode.org/worg/org-contrib/org-mime.php
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;; Version: 0.01
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;;; License:
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3, or (at your option)
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;; any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;; WYSWYG, html mime composition using org-mode
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;;
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;; For mail composed using the orgstruct-mode minor mode, this
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;; provides a function for converting all or part of your mail buffer
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;; to embedded html as exported by org-mode. Call `org-mime-htmlize'
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;; in a message buffer to convert either the active region or the
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;; entire buffer to html.
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;;
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;; Similarly the `org-mime-org-buffer-htmlize' function can be called
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;; from within an org-mode buffer to convert the buffer to html, and
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;; package the results into an email handling with appropriate MIME
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;; encoding.
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;;
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;; you might want to bind this to a key with something like the
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;; following message-mode binding
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;;
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;; (add-hook 'message-mode-hook
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;; (lambda ()
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;; (local-set-key "\C-c\M-o" 'org-mime-htmlize)))
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;;
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;; and the following org-mode binding
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;;
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;; (add-hook 'org-mode-hook
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;; (lambda ()
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;; (local-set-key "\C-c\M-o" 'org-mime-org-buffer-htmlize)))
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;;; Code:
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(defcustom org-mime-default-header
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2010-04-10 13:04:25 -04:00
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"#+OPTIONS: latex:t\n"
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2010-04-09 12:14:05 -04:00
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"Default header to control html export options, and ensure
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first line isn't assumed to be a title line."
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:group 'org-mime
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:type 'string)
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(defcustom org-mime-library 'mml
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"Library to use for marking up MIME elements."
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:group 'org-mime
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:type '(choice 'mml 'semi 'vm))
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(defcustom org-mime-preserve-breaks t
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"Used as temporary value of `org-export-preserve-breaks' during
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mime encoding."
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:group 'org-mime
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:type 'boolean)
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(defcustom org-mime-fixedwith-wrap
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"<pre style=\"font-family: courier, monospace;\">\n%s</pre>\n"
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"Format string used to wrap a fixedwidth HTML email."
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:group 'org-mime
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:type 'string)
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(defcustom org-mime-html-hook nil
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"Hook to run over the html buffer before attachment to email.
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This could be used for example to post-process html elements."
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:group 'org-mime
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:type 'hook)
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;; example hook, for setting a dark background in <pre style="background-color: #EEE;"> elements
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(defun org-mime-change-element-style (element style)
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"Set new default htlm style for <ELEMENT> elements in exported html."
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(while (re-search-forward (format "<%s" element) nil t)
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(replace-match (format "<%s style=\"%s;\"" element style))))
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;; ;; example addition to `org-mime-html-hook' adding a dark background
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;; ;; color to <pre> elements
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;; (add-hook 'org-mime-html-hook
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;; (lambda ()
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;; (org-mime-change-element-style
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;; "pre" (format "color: %s; background-color: %s"
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;; "#E6E1DC" "#232323"))))
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(defun org-mime-file (ext path id)
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"Markup a file for attachment."
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(case org-mime-library
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('mml (format
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"<#part type=\"%s\" filename=\"%s\" id=\"<%s>\">\n<#/part>\n"
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ext path id))
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('semi (format
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"--[[application/octet-stream; type=%s\nContent-ID: %s; filename=\"%s\"][base64]]"
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ext id path))
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('vm "?")))
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(defun org-mime-multipart (plain html)
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"Markup a multipart/alternative with text/plain and text/html
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alternatives."
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(case org-mime-library
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('mml (format (concat "<#multipart type=alternative><#part type=text/plain>"
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"%s<#part type=text/html>%s<#/multipart>\n")
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plain html))
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('semi (format (concat "--<<alternative>>-{\n--[[text/plain;%s\n--]]\n"
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"--[[text/html;%s\n--]]\n--}-<<alternative>>\n")
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plain html))
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('vm "?")))
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(defun org-mime-replace-images (str current-file)
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"Replace images in html files with cid links."
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(let (html-images)
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(cons
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(replace-regexp-in-string ;; replace images in html
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"src=\"\\([^\"]+\\)\""
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(lambda (text)
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(format
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"src=\"cid:%s\""
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(let* ((url (and (string-match "src=\"\\([^\"]+\\)\"" text)
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(match-string 1 text)))
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(path (expand-file-name
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url (file-name-directory current-file)))
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(ext (file-name-extension path))
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(id (replace-regexp-in-string "[\/\\\\]" "_" path)))
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(add-to-list 'html-images
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(org-mime-file (concat "image/" ext) path id))
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id)))
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str)
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html-images)))
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(defun org-mime-htmlize (arg)
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"Export a portion of an email body composed using `mml-mode' to
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html using `org-mode'. If called with an active region only
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export that region, otherwise export the entire body."
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(interactive "P")
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(let* ((region-p (org-region-active-p))
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(html-start (or (and region-p (region-beginning))
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(save-excursion
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(goto-char (point-min))
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(search-forward mail-header-separator)
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(+ (point) 1))))
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(html-end (or (and region-p (region-end))
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;; TODO: should catch signature...
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(point-max)))
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(raw-body (buffer-substring html-start html-end))
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(tmp-file (make-temp-name (expand-file-name "mail" "/tmp/")))
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(body (org-mime-org-export "org" raw-body tmp-file))
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;; because we probably don't want to skip part of our mail
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(org-export-skip-text-before-1st-heading nil)
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;; because we probably don't want to export a huge style file
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(org-export-htmlize-output-type 'inline-css)
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;; makes the replies with ">"s look nicer
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(org-export-preserve-breaks org-mime-preserve-breaks)
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;; to hold attachments for inline html images
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(html-and-images
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(org-mime-replace-images
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(org-mime-org-export "html" raw-body tmp-file)
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tmp-file))
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(html-images (unless arg (cdr html-and-images)))
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(html (org-mime-apply-html-hook
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(if arg
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(format org-mime-fixedwith-wrap body)
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(car html-and-images)))))
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(delete-region html-start html-end)
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(save-excursion
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(goto-char html-start)
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(insert (org-mime-multipart body html)
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(mapconcat 'identity html-images "\n")))))
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(defun org-mime-org-export (fmt body tmp-file)
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"Org-Export BODY to format FMT with the file name set to
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TMP-FILE during export."
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(save-excursion
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(with-temp-buffer
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(insert org-mime-default-header)
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(insert body)
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(write-file tmp-file)
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(substring
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(eval ;; convert to fmt -- mimicing `org-run-like-in-org-mode'
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(list 'let org-local-vars
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(list (intern (concat "org-export-as-" fmt))
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nil nil nil ''string t)))
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(if (string= fmt "org") (length org-mime-default-header) 0)))))
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(defun org-mime-apply-html-hook (html)
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(when org-mime-html-hook
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(with-temp-buffer
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(insert html)
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(goto-char (point-min))
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(run-hooks 'org-mime-html-hook)
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(buffer-string))))
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(defun org-mime-org-buffer-htmlize ()
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"Export the current org-mode buffer to HTML using
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`org-export-as-html' and package the results into an email
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handling with appropriate MIME encoding."
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(interactive)
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(require 'reporter)
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(let* ((region-p (org-region-active-p))
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(current-file (buffer-file-name (current-buffer)))
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(html-start (or (and region-p (region-beginning))
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(save-excursion
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(goto-char (point-min)))))
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(html-end (or (and region-p (region-end))
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(point-max)))
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(body (org-export-as-org nil nil nil 'string t))
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(org-link-file-path-type 'absolute)
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;; because we probably don't want to export a huge style file
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(org-export-htmlize-output-type 'inline-css)
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;; to hold attachments for inline html images
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(html-and-images (org-mime-replace-images
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(org-export-as-html nil nil nil 'string t)
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current-file))
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(html-images (cdr html-and-images))
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(html (org-mime-apply-html-hook (car html-and-images))))
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;; dump the exported html into a fresh message buffer
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(reporter-compose-outgoing)
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(goto-char (point-max))
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(insert (org-mime-multipart body html)
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(mapconcat 'identity html-images "\n"))))
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(provide 'org-mime)
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