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;;; org-fc-type-cloze.el --- Cloze deletion card type -*- lexical-binding: t; -*-
;; Copyright (C) 2020-2021 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: 0.1.0
;; 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:
;;
;;; Code:
(defcustom org-fc-type-cloze-type-property "FC_CLOZE_TYPE"
"Property used to store the card's subtype for cloze cards."
:type 'string
:group 'org-fc)
(defcustom org-fc-type-cloze-context 1
"Number of surrounding cards to show for 'context' type cards."
:type 'number
:group 'org-fc)
(defface org-fc-type-cloze-hole-face
'((t (:bold t)))
"Face for org-fc cloze card holes."
:group 'org-fc)
(defvar org-fc-type-cloze-types
'(deletion enumeration context single)
"List of valid cloze card subtypes.")
(defvar org-fc-type-cloze--text '()
"Text overlay.")
(defvar org-fc-type-cloze--hint '()
"Hint overlay.")
;;; Hole Parsing / Hiding
(defvar org-fc-type-cloze-hole-re
(rx
(seq
"{{"
(group-n 1 (* (or (seq "$" (+ (not (any "$"))) "$")
(not (any "}"))))) "}"
(? (seq "{" (group-n 2 (* (or (seq "$" (not (any "$")) "$")
(not (any "}"))))) "}"))
(? "@" (group-n 3 (+ digit)))
"}"))
"Regexp for a cloze holes.")
(defun org-fc-type-cloze-max-hole-id ()
"Get the max-hole property of the heading at point."
(if-let ((max-id (org-entry-get (point) org-fc-type-cloze-max-hole-property)))
(string-to-number max-id)
-1))
(defun org-fc-type-cloze--parse-holes (current-position end)
"Starting at point, collect all cloze holes before END.
CURRENT-POSITION is the id of the hole being reviewed. Returns a
pair (holes . current-index) where current-index is the index of
the hole for the current position."
(let (holes current-index)
(while (re-search-forward org-fc-type-cloze-hole-re end t)
(when (match-beginning 3)
(push (match-data) holes)
(if (= current-position (string-to-number (match-string 3)))
(setq current-index (1- (length holes))))))
(cons (reverse holes) current-index)))
(defun org-fc-type-cloze--hole-visible-p (type i current-index)
"Determine whether hole I of card TYPE should be visible based.
CURRENT-INDEX is the index of the current position in the list of all holes."
(cl-case type
('enumeration (< i current-index))
('deletion t)
('single nil)
('context (<= (abs (- i current-index)) org-fc-type-cloze-context))
(t (error "Org-fc: Unknown cloze card type %s" type))))
(defun org-fc-type-cloze--end ()
"End of contents of heading at point, excluding subheadings."
(save-excursion
;; If there is no next heading, we end up at `(point-max)`
(outline-next-heading)
(1- (point))))
(defun org-fc-type-cloze-hide-holes (position)
"Hide holes of a card of TYPE in relation to POSITION."
(org-fc-with-point-at-entry
(let* ((type (intern (org-entry-get (point) org-fc-type-cloze-type-property)))
(end (1+ (org-fc-type-cloze--end)))
(holes-index (org-fc-type-cloze--parse-holes position end))
(holes (car holes-index))
(current-index (cdr holes-index)))
(cl-loop
for i below (length holes)
for (hole-beg hole-end text-beg text-end hint-beg hint-end) in holes
do
(progn
;; Fake position if there is no hint
(unless hint-beg (setq hint-beg text-end))
(unless hint-end (setq hint-end text-end))
(cond
;; If the hole is the one currently being reviewed, hide all
;; the hole markup, hide the answer, format the hint as
;; "[...hint]" and set the font for the whole hole.
((= i current-index)
(org-fc-hide-region hole-beg text-beg "")
(remove-overlays text-beg text-end)
(setq org-fc-type-cloze--text
(org-fc-make-overlay text-beg text-end 'invisible t))
(org-fc-hide-region text-end hint-beg "")
(setq org-fc-type-cloze--hint
(org-fc-overlay-surround
(org-fc-make-overlay hint-beg hint-end)
"[..." "]" 'org-fc-type-cloze-hole-face))
(org-fc-hide-region hint-end hole-end "")
(org-fc-make-overlay
hole-beg hole-end
'face 'org-fc-type-cloze-hole-face))
;; If the text of another hole should be visible,
;; hide the hole markup and the hint
((org-fc-type-cloze--hole-visible-p type i current-index)
(org-fc-hide-region hole-beg text-beg)
(org-fc-hide-region text-end hole-end))
;; If the text of another hole should not be visible,
;; hide the whole hole
(t (org-fc-hide-region hole-beg hole-end "..."))))))))
;;; Setup / Flipping
(defun org-fc-type-cloze-init (type)
"Initialize the current heading for use as a cloze card of subtype TYPE.
Processes all holes in the card text."
(interactive (list
(intern
(completing-read "Cloze Type: " org-fc-type-cloze-types))))
(unless (member type org-fc-type-cloze-types)
(error "Invalid cloze card type: %s" type))
(org-fc--init-card "cloze")
(org-fc-type-cloze-update)
(org-set-property org-fc-type-cloze-type-property (format "%s" type)))
(defun org-fc-type-cloze-setup (position)
"Prepare POSITION of a cloze card for review."
(setq org-fc-type-cloze--text nil)
(setq org-fc-type-cloze--hint nil)
(outline-hide-subtree)
(org-show-entry)
(org-fc-type-cloze-hide-holes (string-to-number position)))
(defun org-fc-type-cloze-flip ()
"Flip a cloze card."
(org-show-children)
(overlay-put org-fc-type-cloze--text 'invisible nil)
(org-fc-show-latex)
;; Remove all overlays in the region of the hint to get rid of
;; latex overlays in the hint, then hide the region again.
(let* ((hint-start (overlay-start org-fc-type-cloze--hint))
(hint-end (overlay-end org-fc-type-cloze--hint)))
(remove-overlays hint-start hint-end)
(org-fc-hide-region hint-start hint-end)))
(defun org-fc-type-cloze-update ()
"Update the review data & deletions of the current heading."
(let* ((end (org-fc-type-cloze--end))
(hole-id (1+ (org-fc-type-cloze-max-hole-id)))
ids)
(save-excursion
(while (re-search-forward org-fc-type-cloze-hole-re end t)
(let ((id (match-string 3))
(hole-end (match-end 0)))
(unless id
(setq id hole-id)
(cl-incf hole-id 1)
(let ((id-str (number-to-string id)))
(cl-incf end (+ 1 (length id-str)))
(goto-char hole-end)
(backward-char)
(insert "@" id-str)))
(push (format "%s" id) ids))))
(org-set-property
org-fc-type-cloze-max-hole-property
(format "%s" (1- hole-id)))
(org-fc-review-data-update (reverse ids))))
(org-fc-register-type
'cloze
'org-fc-type-cloze-setup
'org-fc-type-cloze-flip
'org-fc-type-cloze-update)
;;; Footer
(provide 'org-fc-type-cloze)
;;; org-fc-type-cloze.el ends here
|
