;;; emacspeak-enriched.el --- Audio Formatting for Emacs' WYSIWYG RichText  mode  -*- lexical-binding: t; -*-
;;; $Id$
;;; $Author: tv.raman.tv $ 
;;; Description: Emacspeak module to speak voiceify rich text
;;; Keywords:emacspeak, audio interface to emacs rich text
;;{{{  LCD Archive entry: 

;;; LCD Archive Entry:
;;; emacspeak| T. V. Raman |tv.raman.tv@gmail.com
;;; A speech interface to Emacs |
;;; $Date: 2007-08-25 18:28:19 -0700 (Sat, 25 Aug 2007) $ |
;;;  $Revision: 4532 $ | 
;;; Location undetermined
;;;

;;}}}
;;{{{  Copyright:
;;;Copyright (C) 1995 -- 2018, T. V. Raman 
;;; Copyright (c) 1995 by T. V. Raman  
;;; All Rights Reserved. 
;;;
;;; This file is not part of GNU Emacs, but the same permissions apply.
;;;
;;; 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 2, 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; see the file COPYING.  If not, write to
;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

;;}}}

;;{{{  Introduction
;;; Commentary:
;;; emacspeak extensions to voiceify rich  text.
;;; Code:
;;}}}
;;{{{ required modules
(cl-declaim  (optimize  (safety 0) (speed 3)))
(require 'emacspeak-preamble)

;;}}}
;;{{{ voiceify-faces 
(defvar emacspeak-enriched-font-faces-to-voiceify
  (list 'bold 'italic   'bold-italic 'underlined)
  "List of font faces we voiceify")

(defun emacspeak-enriched-voiceify-faces (start end)
  "Map base fonts to voices.
Useful in voiceifying rich text."
  (interactive "r")
  (cl-declare (special emacspeak-enriched-font-faces-to-voiceify))
  (set (make-local-variable 'voice-lock-mode) t)
  (with-silent-modifications
    (save-excursion
      (goto-char start)
      (let ((face nil)
            (orig start)
            (pos nil)
            (justification-type nil))
        (unless (get-text-property (point) 'justification)
          (goto-char
           (or
            (next-single-property-change (point) 'justification
                                         (current-buffer) end)
            end)))
        (while (and  (not (eobp))
                     (< start end))
          (setq justification-type (get-text-property (point) 'justification))
          (save-excursion
            (beginning-of-line)
            (setq pos (point)))
          (goto-char
           (or
            (next-single-property-change (point) 'justification
                                         (current-buffer) end)
            end))
          (when justification-type
            (put-text-property pos (point)
                               'auditory-icon
                               justification-type))
          (setq start (point)))
        (goto-char orig)
        (while (and  (not (eobp))
                     (< start end))
          (setq face (get-text-property (point) 'face))
          (goto-char
           (or
            (next-single-property-change (point) 'face
                                         (current-buffer) end)
            end))
          (when (listp face)
            (setq face 
                  (cl-loop for f in emacspeak-enriched-font-faces-to-voiceify
                           thereis (cl-find f face))))
          (when face 
            (put-text-property start  (point)
                               'personality
                               (voice-setup-get-voice-for-face face))
            (setq face nil))
          (setq start (point))))))
  (message "voicified faces"))

;;}}}
;;{{{ advice enriched to automatically map faces to voices

(defadvice enriched-decode (after emacspeak pre act comp)
  "Map faces to voices. "
  (let ((start (ad-get-arg 0))
        (end (ad-get-arg 1)))
    (emacspeak-enriched-voiceify-faces start end)
    ad-return-value))

(defadvice enriched-mode (after emacspeak pre act comp)
  "Map faces to voices. "
  (emacspeak-enriched-voiceify-faces (point-min) (point-max))
  ad-return-value)

;;}}}
;;{{{ hooks
(add-hook 'enriched-mode-hook
           #'(lambda ()
             (or emacspeak-audio-indentation
                 (emacspeak-toggle-audio-indentation))))
;;}}}
(provide  'emacspeak-enriched)
;;{{{  emacs local variables 

;;; local variables:
;;; folded-file: t
;;; end: 

;;}}}
