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;;; org-fc-type-vocab.el --- Card type for learning vocabulary -*- lexical-binding: t; -*-
;; Copyright (C) 2020 Leon Rische
;; Author: Leon Rische <emacs@leonrische.me>
;; Url: https://www.leonrische.me/pages/org_flashcards.html
;; Package-requires: ((emacs "26.3") (org "9.3"))
;; Version: 0.0.1
;; This program 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.
;; This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Cards of this type should have the (foreign language) word as their
;; heading with a definition on the back.
;;
;; During review, the user is prompted for the definition of the word
;; or asked to type in the word based on its definitions.
;;
;;; Code:
(require 'org-fc-diff)
(require 'org-fc-audio)
(defcustom org-fc-type-vocab-slow-speed 0.7
"Speed to use for slow playback."
:type 'number
:group 'org-fc)
(defcustom org-fc-type-vocab-audio-property "FC_VOCAB_AUDIO"
"Property with path to audio file."
:type 'string
:group 'org-fc)
(defun org-fc-type-vocab-init ()
"Mark headline as card of the vocab type."
(interactive)
(org-fc--init-card "vocab")
(org-fc-review-data-update '("front" "back")))
(defun org-fc-type-vocab-setup (position)
"Prepare POSITION of a vocab card for review."
(pcase position
("front"
(org-fc-audio-play org-fc-type-vocab-audio-property)
(org-fc-type-normal-setup position))
("back"
(org-fc-type-vocab-typing-setup)
(org-fc-audio-play org-fc-type-vocab-audio-property)
'rate)
(_ (error "Invalid vocab position %s" position))))
(defun org-fc-type-vocab-flip ()
"Flip a vocab card."
(org-fc-type-normal-flip))
(defun org-fc-type-vocab-play ()
"Play vocab audio file at normal speed."
(interactive)
(org-fc-audio-play org-fc-type-vocab-audio-property))
(defun org-fc-type-vocab-play-slow ()
"Play vocab audio file at slow speed."
(interactive)
(org-fc-audio-play org-fc-type-vocab-audio-property org-fc-type-vocab-slow-speed))
(defun org-fc-vocab-content ()
"Heading position & text as a (pos . string) pair."
(save-excursion
(org-fc-goto-entry-heading)
(let ((case-fold-search nil))
(if (looking-at org-complex-heading-regexp)
(cons
(match-beginning 4)
(buffer-substring-no-properties (match-beginning 4) (match-end 4)))))))
(defun org-fc-type-vocab-typing-setup ()
"Prepare a text-input vocab card for review."
(interactive)
(org-show-subtree)
(let* ((pos-content (org-fc-vocab-content))
(content (cdr pos-content))
(start (car pos-content))
(end (+ start (length content)))
(ov (org-fc-hide-region start end "..."))
(deemph (org-fc-deemphasize content))
(diff (org-fc-diff (read-string "Answer: ") (cdr deemph))))
(delete-overlay ov)
;; Overlay for user input
(when (car deemph)
(setq start (1+ start))
(setq end (1- end)))
(org-fc-hide-region start end (car diff))
;; Overlay for expected answer, using the newline after the answer
(if (cdr diff)
(org-fc-hide-region
end (1+ end)
(concat
"\n! "
(if (null (car deemph))
(cdr diff)
(org-fc-emphasize
(concat (car deemph) (cdr diff) (car deemph))))
"")))))
(org-fc-register-type
'vocab
'org-fc-type-vocab-setup
'org-fc-type-vocab-flip
'org-fc-noop)
;;; Footer
(provide 'org-fc-type-vocab)
;;; org-fc-type-vocab.el ends here
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