_spacemacs.d/local: import mu4e git20160515

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+;;; org-mu4e -- Support for links to mu4e messages/queries from within
+;;; org-mode, and for writing message in org-mode, sending them as
+;;; rich-text
+;;
+;; Copyright (C) 2012-2016 Dirk-Jan C. Binnema
+
+;; Author: Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+;; Maintainer: Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+;; Keywords: outlines, hypermedia, calendar, mail
+;; Version: 0.0
+
+;; 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 1the 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:
+
+;;; Code:
+
+
+;; The expect version here is org 8.x
+
+
+;; the 'noerror is just to make sure bytecompilations does not break...
+;; FIXME: find a better solution
+(require 'org nil 'noerror)
+(require 'org-exp nil 'noerror)
+
+(eval-when-compile (require 'cl))
+(require 'mu4e)
+
+(defgroup org-mu4e nil
+  "Settings for the org-mode related functionality in mu4e."
+  :group 'mu4e
+  :group 'org)
+
+(defvar org-mu4e-link-query-in-headers-mode nil
+  "If non-nil, `org-store-link' in `mu4e-headers-mode' links to the
+the current query; otherwise, it links to the message at point.")
+
+(defcustom org-mu4e-link-desc-func
+  (lambda (msg) (or (plist-get msg :subject) "No subject"))
+  "Function that takes a msg and returns a string for the
+description part of an org-mode link.
+
+Example usage:
+
+  (defun my-link-descr (msg)
+    (let ((subject (or (plist-get msg :subject)
+                       \"No subject\"))
+          (date (or (format-time-string mu4e-headers-date-format
+                    (mu4e-msg-field msg :date))
+                    \"No date\")))
+      (concat subject \" \" date)))
+
+  (setq org-mu4e-link-desc-func 'my-link-descr)"
+  :type 'function
+  :group 'org-mu4e)
+
+(defun org-mu4e-store-link ()
+  "Store a link to a mu4e query or message."
+  (when (member major-mode '(mu4e-headers-mode mu4e-view-mode))
+    (if (and (eq major-mode 'mu4e-headers-mode)
+	  org-mu4e-link-query-in-headers-mode)
+      ;; storing links to queries
+      (let* ((query (mu4e-last-query))
+	      desc link)
+	(org-store-link-props :type "mu4e" :query query)
+	(setq
+	  desc (concat "mu4e:query:" query)
+	  link desc)
+	(org-add-link-props :link link :description desc)
+	link)
+      ;; storing links to messages
+      (let* ((msg  (mu4e-message-at-point))
+             (msgid   (or (plist-get msg :message-id) "<none>"))
+             (from  (or (plist-get msg :from) '(("none" . "none"))))
+             (fromname (car (car from)))
+             (fromaddress (cdr (car from)))
+             (to  (or (plist-get msg :to) '(("none" . "none"))))
+             (toname (car (car to)))
+             (toaddress (cdr (car to)))
+             (fromto (if (mu4e-user-mail-address-p fromaddress)
+                         (format "to %s <%s>" toname toaddress)
+                       (format "from %s <%s>" fromname fromaddress)))
+             (date (plist-get msg :date))
+             (date-ts (format-time-string (org-time-stamp-format t) date))
+             (date-ts-ia (format-time-string (org-time-stamp-format t t) date))
+             (subject  (or (plist-get msg :subject) "<none>"))
+             link)
+        (org-store-link-props :type "mu4e" :link link
+                              :message-id msgid)
+        (setq link (concat "mu4e:msgid:" msgid))
+        (org-add-link-props :link link
+                            :to (format "%s <%s>" toname toaddress)
+                            :toname toname
+                            :toaddress toaddress
+                            :from (format "%s <%s>" fromname fromaddress)
+                            :fromname fromname
+                            :fromaddress fromaddress
+                            :fromto fromto
+                            :date date-ts-ia
+                            :date-timestamp date-ts
+                            :date-timestamp-inactive date-ts-ia
+                            :subject subject
+                            :description (funcall org-mu4e-link-desc-func msg))
+        link))))
+
+(org-add-link-type "mu4e" 'org-mu4e-open)
+(add-hook 'org-store-link-functions 'org-mu4e-store-link)
+
+(defun org-mu4e-open (path)
+  "Open the mu4e message (for paths starting with 'msgid:') or run
+the query (for paths starting with 'query:')."
+  (cond
+    ((string-match "^msgid:\\(.+\\)" path)
+      (mu4e-view-message-with-message-id (match-string 1 path)))
+    ((string-match "^query:\\(.+\\)" path)
+      (mu4e-headers-search (match-string 1 path) current-prefix-arg))
+    (t (mu4e-error "mu4e: unrecognized link type '%s'" path))))
+
+(defun org-mu4e-store-and-capture ()
+  "Store a link to the current message or query (depending on
+`org-mu4e-link-query-in-headers-mode', and capture it with
+org-mode)."
+  (interactive)
+  (org-mu4e-store-link)
+  (org-capture))
+
+
+
+;;; editing with org-mode ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; below, some functions for the org->html conversion
+;; based on / inspired by Eric Schulte's org-mime.el
+;; Homepage: http://orgmode.org/worg/org-contrib/org-mime.php
+;;
+;; EXPERIMENTAL
+(defun org~mu4e-mime-file (ext path id)
+  "Create a file for an attachment."
+  (format (concat "<#part type=\"%s\" filename=\"%s\" "
+	    "disposition=inline id=\"<%s>\">\n<#/part>\n")
+    ext path id))
+
+(defun org~mu4e-mime-multipart (plain html &optional images)
+  "Create 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."
+  (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"))
+
+(defun org~mu4e-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~mu4e-mime-file
+			  (concat "image/" ext) path id))
+           id)))
+      str)
+     html-images)))
+
+(defun org~mu4e-mime-convert-to-html ()
+  "Convert the current body to html."
+  (unless (fboundp 'org-export-string-as)
+    (mu4e-error "require function 'org-export-string-as not found."))
+  (unless (executable-find "dvipng")
+    (mu4e-error "Required program dvipng not found"))
+  (let* ((begin
+	     (save-excursion
+	       (goto-char (point-min))
+	       (search-forward mail-header-separator)))
+	    (end (point-max))
+	    (raw-body (buffer-substring begin end))
+	    (tmp-file (make-temp-name (expand-file-name "mail"
+					temporary-file-directory)))
+	    ;; because we probably don't want to skip part of our mail
+	    (org-export-skip-text-before-1st-heading nil)
+	    ;; 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 t)
+	    ;; dvipng for inline latex because MathJax doesn't work in mail
+	    (org-export-with-LaTeX-fragments 'dvipng)
+	    ;; to hold attachments for inline html images
+	    (html-and-images
+	      (org~mu4e-mime-replace-images
+                (org-export-string-as raw-body 'html t)
+		tmp-file))
+	    (html-images (cdr html-and-images))
+	    (html (car html-and-images)))
+      (delete-region begin end)
+      (save-excursion
+	(goto-char begin)
+	(newline)
+	(insert (org~mu4e-mime-multipart
+		  raw-body html (mapconcat 'identity html-images "\n"))))))
+
+;; next some functions to make the org/mu4e-compose-mode switch as smooth as
+;; possible.
+(defun org~mu4e-mime-decorate-headers ()
+  "Make the headers visually distinctive (org-mode)."
+  (save-excursion
+    (goto-char (point-min))
+    (let* ((eoh (when (search-forward mail-header-separator)
+		  (match-end 0)))
+	    (olay (make-overlay (point-min) eoh)))
+      (when olay
+	(overlay-put olay 'face 'font-lock-comment-face)))))
+
+(defun org~mu4e-mime-undecorate-headers ()
+  "Don't make the headers visually distinctive.
+\(well, mu4e-compose-mode will take care of that)."
+  (save-excursion
+    (goto-char (point-min))
+    (let* ((eoh (when (search-forward mail-header-separator)
+		  (match-end 0))))
+      (remove-overlays (point-min) eoh))))
+
+(defvar org-mu4e-convert-to-html nil
+  "Whether to do automatic org-mode => html conversion when sending messages.")
+
+(defun org~mu4e-mime-convert-to-html-maybe ()
+  "Convert to html if `org-mu4e-convert-to-html' is non-nil.
+This function is called when sending a message (from
+`message-send-hook') and, if non-nil, will send the message as
+the rich-text version of the what is assumed to be an org-mode
+body."
+  (when org-mu4e-convert-to-html
+    (mu4e-message "Converting to html")
+    (org~mu4e-mime-convert-to-html)))
+ 
+(defun org~mu4e-mime-switch-headers-or-body ()
+  "Switch the buffer to either mu4e-compose-mode (when in headers)
+or org-mode (when in the body)."
+  (interactive)
+  (let* ((sepapoint
+	   (save-excursion
+	     (goto-char (point-min))
+	     (search-forward-regexp mail-header-separator nil t))))
+    ;; only do stuff when the sepapoint exist; note that after sending the
+    ;; message, this function maybe called on a message with the sepapoint
+    ;; stripped. This is why we don't use `message-point-in-header'.
+    (when sepapoint
+      (cond
+	;; we're in the body, but in mu4e-compose-mode?
+	;; if so, switch to org-mode
+	((and (> (point) sepapoint) (eq major-mode 'mu4e-compose-mode))
+	  (org-mode)
+	  (add-hook 'before-save-hook
+	    (lambda ()
+	      (mu4e-error "Switch to mu4e-compose-mode (M-m) before saving."))
+	    nil t)
+	  (org~mu4e-mime-decorate-headers)
+	  (local-set-key (kbd "M-m")
+	    (lambda (keyseq)
+	      (interactive "kEnter mu4e-compose-mode key sequence: ")
+	      (let ((func (lookup-key mu4e-compose-mode-map keyseq)))
+		(if func (funcall func) (insert keyseq))))))
+	;; we're in the headers, but in org-mode?
+	;; if so, switch to mu4e-compose-mode
+	((and (<= (point) sepapoint) (eq major-mode 'org-mode))
+      	  (org~mu4e-mime-undecorate-headers)
+	  (mu4e-compose-mode)
+	  (add-hook 'message-send-hook 'org~mu4e-mime-convert-to-html-maybe nil t)))
+      ;; and add the hook
+      (add-hook 'post-command-hook 'org~mu4e-mime-switch-headers-or-body t t))))
+
+
+(defun org-mu4e-compose-org-mode ()
+  "Pseudo-Minor mode for mu4e-compose-mode, to edit the message
+body using org-mode."
+  (interactive)
+  (unless (member major-mode '(org-mode mu4e-compose-mode))
+    (mu4e-error "Need org-mode or mu4e-compose-mode"))
+  ;; we can check if we're already in org-mu4e-compose-mode by checking if the
+  ;; post-command-hook is set; hackish...but a buffer-local variable does not
+  ;; seem to survive buffer switching
+  (if (not (member 'org~mu4e-mime-switch-headers-or-body post-command-hook))
+    (progn
+      (org~mu4e-mime-switch-headers-or-body)
+      (mu4e-message
+	(concat
+	  "org-mu4e-compose-org-mode enabled; "
+	  "press M-m before issuing message-mode commands")))
+    (progn ;; otherwise, remove crap
+      (remove-hook 'post-command-hook 'org~mu4e-mime-switch-headers-or-body t)
+      (org~mu4e-mime-undecorate-headers) ;; shut off org-mode stuff
+      (mu4e-compose-mode)
+      (message "org-mu4e-compose-org-mode disabled"))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(provide 'org-mu4e)
+
+;;; org-mu4e.el ends here