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;;; org-fc-type-text-input.el --- Text-input 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:
(require 'org-fc-diff)
(defun org-fc-text-input-content ()
"Return the first line of a cards (back) contents.
Returns a pair (pos . string). If the card has a 'Back' heading,
its content is used, otherwise, the main content is used. This
function is expected to be called with point on a heading."
(save-excursion
;; Go to main or "Back" heading
(if-let ((pos (org-fc-back-heading-position)))
(goto-char pos))
;; Skip metadata & drawers
(forward-line)
(while (or (looking-at-p org-scheduled-regexp)
(looking-at-p org-deadline-regexp))
(forward-line))
(while (looking-at org-drawer-regexp)
(if (re-search-forward ":END:" nil t)
(forward-line)
(error "No :END: found for drawer")))
(unless (looking-at-p org-heading-regexp)
(cons
(point)
(buffer-substring-no-properties (point) (point-at-eol))))))
(defun org-fc-type-text-input-init ()
"Mark headline as card of the text-input type."
(interactive)
(unless (org-fc-text-input-content)
(error "Card contains content"))
(org-fc--init-card "text-input")
(org-fc-review-data-update '("front")))
(defun org-fc-type-text-input-setup (_position)
"Prepare a text-input card for review."
(interactive)
;; Hide answer
(outline-hide-subtree)
(when (org-fc-has-back-heading-p)
(org-show-entry)
(org-fc-with-point-at-back-heading (org-show-set-visibility 'minimal)))
;; Prompt user, create diff overlay
(let* ((pos-content (org-fc-text-input-content))
(content (cdr pos-content))
(start (car pos-content))
(end (+ start (length content)))
(deemph (org-fc-deemphasize content))
(diff (org-fc-diff (read-string "Answer: ") (cdr deemph))))
;; 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
" (expected: "
(if (null (car deemph))
(cdr diff)
(org-fc-emphasize
(concat (car deemph) (cdr diff) (car deemph))))
")\n"))))
;; Reveal answer & diff
(save-excursion
(org-show-entry)
(org-show-children)
(org-fc-with-point-at-back-heading
(org-show-entry)
(org-show-children)
(org-fc-show-latex))))
(org-fc-register-type
'text-input
'org-fc-type-text-input-setup
nil
'org-fc-noop)
;;; Footer
(provide 'org-fc-type-text-input)
;;; org-fc-type-text-input.el ends here
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