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;;; gnus-gravatar.el --- Gnus Gravatar support

;; Copyright (C) 2010 Free Software Foundation, Inc.

;; Author: Julien Danjou <julien@danjou.info>
;; Keywords: news

;; This file is 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:

;;; Code:

(require 'gravatar)
(require 'gnus-art)

(defgroup gnus-gravatar nil
  "Gnus Gravatar."
  :group 'gnus-visual)

(defcustom gnus-gravatar-size 32
  "How big should gravatars be displayed."
  :type 'integer
  :version "24.1"
  :group 'gnus-gravatar)

(defcustom gnus-gravatar-properties '(:ascent center :relief 1)
  "List of image properties applied to Gravatar images."
  :type 'list
  :version "24.1"
  :group 'gnus-gravatar)

(defcustom gnus-gravatar-too-ugly gnus-article-x-face-too-ugly
  "Regexp matching posters whose avatar shouldn't be shown automatically."
  :type '(choice regexp (const nil))
  :version "24.1"
  :group 'gnus-gravatar)

(defun gnus-gravatar-transform-address (header category &optional force)
  (gnus-with-article-headers
    (let ((addresses
           (mail-header-parse-addresses
            ;; mail-header-parse-addresses does not work (reliably) on
            ;; decoded headers.
            (or
             (ignore-errors
               (mail-encode-encoded-word-string
                (or (mail-fetch-field header) "")))
             (mail-fetch-field header))))
	  (gravatar-size gnus-gravatar-size)
	  name)
      (dolist (address addresses)
	(when (and (setq name (cdr address))
		   (string-match "\\`\\*+ " name)) ;; (X-)Faces exist.
	  (setcdr address (setq name (substring name (match-end 0)))))
	(when (or force
		  (not (and gnus-gravatar-too-ugly
			    (or (string-match gnus-gravatar-too-ugly
					      (car address))
				(and name
				     (string-match gnus-gravatar-too-ugly
						   name))))))
	  (ignore-errors
	    (gravatar-retrieve
	     (car address)
	     'gnus-gravatar-insert
	     (list header address category))))))))

(defun gnus-gravatar-insert (gravatar header address category)
  "Insert GRAVATAR for ADDRESS in HEADER in current article buffer.
Set image category to CATEGORY."
  (unless (eq gravatar 'error)
    (gnus-with-article-headers
      ;; The buffer can be gone at this time
      (when (buffer-live-p (current-buffer))
        (gnus-article-goto-header header)
        (mail-header-narrow-to-field)
        (let ((real-name (cdr address))
              (mail-address (car address)))
          (when (if real-name             ; have a realname, go for it!
                    (and (search-forward real-name nil t)
                         (search-backward real-name nil t))
                  (and (search-forward mail-address nil t)
                       (search-backward mail-address nil t)))
            (goto-char (1- (point)))
            ;; If we're on the " quoting the name, go backward
            (when (looking-at "[\"<]")
              (goto-char (1- (point))))
            ;; Do not do anything if there's already a gravatar. This can
            ;; happens if the buffer has been regenerated in the mean time, for
            ;; example we were fetching someaddress, and then we change to
            ;; another mail with the same someaddress.
            (unless (memq 'gnus-gravatar (text-properties-at (point)))
              (let ((inhibit-read-only t)
                    (point (point)))
                (unless (featurep 'xemacs)
                  (setq gravatar (append gravatar gnus-gravatar-properties)))
                (gnus-put-image gravatar nil category)
                (put-text-property point (point) 'gnus-gravatar address)
                (gnus-add-wash-type category)
                (gnus-add-image category gravatar)))))))))

;;;###autoload
(defun gnus-treat-from-gravatar (&optional force)
  "Display gravatar in the From header.
If gravatar is already displayed, remove it."
  (interactive (list t)) ;; When type `W D g'
  (gnus-with-article-buffer
    (if (memq 'from-gravatar gnus-article-wash-types)
	(gnus-delete-images 'from-gravatar)
      (gnus-gravatar-transform-address "from" 'from-gravatar force))))

;;;###autoload
(defun gnus-treat-mail-gravatar (&optional force)
  "Display gravatars in the Cc and To headers.
If gravatars are already displayed, remove them."
  (interactive (list t)) ;; When type `W D h'
    (gnus-with-article-buffer
      (if (memq 'mail-gravatar gnus-article-wash-types)
          (gnus-delete-images 'mail-gravatar)
	(gnus-gravatar-transform-address "cc" 'mail-gravatar force)
	(gnus-gravatar-transform-address "to" 'mail-gravatar force))))

(provide 'gnus-gravatar)

;;; gnus-gravatar.el ends here