;;; mu4e-actions.el -- part of mu4e, the mu mail user agent
;;
;; Copyright (C) 2011-2012 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:

;; Example actions for messages, attachments (see chapter 'Actions' in the
;; manual)

;;; Code:
(eval-when-compile (byte-compile-disable-warning 'cl-functions))
(require 'cl)
(require 'ido)

(require 'mu4e-message)
(require 'mu4e-meta)



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(defun mu4e-action-count-lines (msg)
  "Count the number of lines in the e-mail message.
Works for headers view and message-view."
  (message "Number of lines: %s"
    (shell-command-to-string
      (concat "wc -l < " (shell-quote-argument (mu4e-message-field msg :path))))))
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(defvar mu4e-msg2pdf (concat mu4e-builddir "/toys/msg2pdf/msg2pdf")
  "Path to the msg2pdf toy.")

(defun mu4e-action-view-as-pdf (msg)
  "Convert the message to pdf, then show it.
Works for the message view."
  (unless (file-executable-p mu4e-msg2pdf)
    (mu4e-error "msg2pdf not found; please set `mu4e-msg2pdf'"))
  (let* ((pdf
	  (shell-command-to-string
	    (concat mu4e-msg2pdf " "
	      (shell-quote-argument (mu4e-message-field msg :path))
	      " 2> /dev/null")))
	 (pdf (and pdf (> (length pdf) 5)
		(substring pdf 0 -1)))) ;; chop \n
    (unless (and pdf (file-exists-p pdf))
      (mu4e-warn "Failed to create PDF file"))
    (find-file pdf)))
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(defun mu4e-action-view-in-browser (msg)
  "View the body of the message in a web browser.
You can influence the browser to use with the variable
`browse-url-generic-program'."
  (let* ((html (mu4e-message-field msg :body-html))
	  (txt (mu4e-message-field msg :body-txt))
	  (tmpfile (format "%s%x.html" temporary-file-directory (random t))))
    (unless (or html txt)
      (mu4e-error "No body part for this message"))
    (with-temp-buffer
      ;; simplistic -- but note that it's only an example...
      (insert (or html (concat "<pre>" txt "</pre>")))
      (write-file tmpfile)
      (browse-url (concat "file://" tmpfile)))))
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  (defconst mu4e-text2speech-command "festival --tts"
    "Program that speaks out text it receives on standard-input.")

(defun mu4e-action-message-to-speech (msg)
  "Pronounce the message text using `mu4e-text2speech-command'."
  (unless (mu4e-message-field msg :body-txt)
    (mu4e-warn "No text body for this message"))
  (with-temp-buffer
    (insert (mu4e-message-field msg :body-txt))
    (shell-command-on-region (point-min) (point-max)
      mu4e-text2speech-command)))
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(defvar mu4e-captured-message nil
  "The last-captured message (the s-expression).")

(defun mu4e-action-capture-message (msg)
  "Remember MSG; we can create a an attachment based on this msg
with `mu4e-compose-attach-captured-message'."
  (setq mu4e-captured-message msg)
  (message "Message has been captured"))
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(defvar mu4e-org-contacts-file nil
  "File to store contact information for org-contacts.
Needed by `mu4e-action-add-org-contact'.")

(eval-when-compile ;; silence compiler warning about free variable
  (unless (require 'org-capture nil 'noerror)
    (defvar org-capture-templates nil)))

(defun mu4e-action-add-org-contact (msg)
  "Add an org-contact entry based on the From: address of the
current message (in headers or view). You need to set
`mu4e-org-contacts-file' to the full path to the file where you
store your org-contacts."
  (unless (require 'org-capture nil 'noerror)
    (mu4e-error "org-capture is not available."))
  (unless mu4e-org-contacts-file
    (mu4e-error "`mu4e-org-contacts-file' is not defined."))
  (let* ((sender (car-safe (mu4e-message-field msg :from)))
	  (name (car-safe sender)) (email (cdr-safe sender))
	  (blurb
	    (format
	      (concat
		"* %%?%s\n"
		":PROPERTIES:\n"
		":EMAIL: %s\n"
		":NICK:\n"
		":BIRTHDAY:\n"
		":END:\n\n")
	      (or name email "")
	      (or email "")))
	  (key "mu4e-add-org-contact-key")
	  (org-capture-templates
	    (append org-capture-templates
	      (list (list key "contacts" 'entry
		      (list 'file mu4e-org-contacts-file) blurb)))))
    (message "%S" org-capture-templates)
    (when (fboundp 'org-capture)
      (org-capture nil key))))
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(defun mu4e-action-git-apply-patch (msg)
  "Apply the git [patch] message."
  (let ((path (ido-read-directory-name "Target directory: "
                                       (car ido-work-directory-list)
                                       "~/" t)))
    (setf ido-work-directory-list
          (cons path (delete path ido-work-directory-list)))
    (shell-command
      (format "cd %s; git apply %s"
	path
	(mu4e-message-field msg :path)))))

(defun mu4e-action-git-apply-mbox (msg)
  "Apply and commit the git [patch] message."
  (let ((path (ido-read-directory-name "Target directory: "
                                       (car ido-work-directory-list)
                                       "~/" t)))
    (setf ido-work-directory-list
          (cons path (delete path ido-work-directory-list)))
    (shell-command
      (format "cd %s; git am %s"
	path
	(mu4e-message-field msg :path)))))

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(defvar mu4e-action-tags-header "X-Keywords"
  "Header where tags are stored. Used by `mu4e-action-retag-message'.
   Make sure it is one of the headers mu recognizes for storing
   tags: X-Keywords, X-Label, Keywords. Also note that changing
   this setting on already tagged messages can lead to messages
   with multiple tags headers.")

(defun mu4e~contains-line-matching (regexp path)
  "Determine whether the file at path contains a line matching
   the given regexp."
  (with-temp-buffer
    (insert-file-contents path)
    (save-excursion
      (goto-char (point-min))
      (if (re-search-forward regexp nil t)
	t
	nil))))

(defun mu4e~replace-first-line-matching (regexp to-string path)
  "Replace the first line in the file at path that matches regexp
   with the string replace."
  (with-temp-file path
    (insert-file-contents path)
    (save-excursion
      (goto-char (point-min))
      (if (re-search-forward regexp nil t)
	(replace-match to-string nil nil)))))

(defun mu4e-action-retag-message (msg &optional retag-arg)
  "Change tags of a message. Example: +tag \"+long tag\" -oldtag
   adds 'tag' and 'long tag', and removes oldtag."
  (let* ((retag (or retag-arg (read-string "Tags: ")))
	  (path (mu4e-message-field msg :path))
	  (maildir (mu4e-message-field msg :maildir))
	  (oldtags (mu4e-message-field msg :tags))
	  (header  mu4e-action-tags-header)
	  (sep     (cond ((string= header "Keywords") " ")
		     ((string= header "X-Label") " ")
		     ((string= header "X-Keywords") ", ")
		     (t ", ")))
	  (taglist (if oldtags (copy-sequence oldtags) '()))
	  tagstr)
    (dolist (tag (split-string-and-unquote retag) taglist)
      (cond
	((string-match "^\\+\\(.+\\)" tag)
	  (setq taglist (push (match-string 1 tag) taglist)))
	((string-match "^\\-\\(.+\\)" tag)
	  (setq taglist (delete (match-string 1 tag) taglist)))
	(t
	  (setq taglist (push tag taglist)))))

    (setq taglist (sort (delete-dups taglist) 'string<))
    (setq tagstr (mapconcat 'identity taglist sep))

    (setq tagstr (replace-regexp-in-string "[\\&]" "\\\\\\&" tagstr))
    (setq tagstr (replace-regexp-in-string "[/]"   "\\&" tagstr))

    (if (not (mu4e~contains-line-matching (concat header ":.*") path))
      ;; Add tags header just before the content
      (mu4e~replace-first-line-matching
	"^$" (concat header ": " tagstr "\n") path)

      ;; replaces keywords, restricted to the header
      (mu4e~replace-first-line-matching
	(concat header ":.*")
	(concat header ": " tagstr)
       path))

    (mu4e-message (concat "tagging: " (mapconcat 'identity taglist ", ")))
    (mu4e-refresh-message path maildir)))

(defun mu4e-action-show-thread (msg)
  "Show all messages that are in the same thread as the message
at point."
  (let ((msgid (mu4e-message-field msg :message-id)))
    (when msgid
      (let ((mu4e-headers-show-threads t)
	     (mu4e-headers-include-related t))
        (mu4e-headers-search
         (format "msgid:%s" msgid))))))
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(provide 'mu4e-actions)
