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cangjie-practice.el
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cangjie-practice.el
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;;; cangjie-practice.el --- Cangjie practice session -*- lexical-binding: t -*-
;; Author: Kisaragi Hiu
;; Keywords: keywords
;; This file is not part of GNU Emacs
;; This file 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, 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.
;; For a full copy of the GNU General Public License
;; see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; A Cangjie typing practice mode.
;;; Code:
(require 'cangjie)
(require 'dash)
(require 's)
(defun cangjie-practice--trim (string)
"Trim STRING, treating IDEOGRAPHIC SPACE ( ) as a whitespace as well."
(string-trim string "[ \t\n\r ]+" "[ \t\n\r ]+"))
(defvar-local cangjie-practice--state nil)
(defmacro cangjie-practice--state (key)
"Access KEY in `cangjie-practice--state'."
`(map-elt cangjie-practice--state ,key))
(defun cangjie-practice--state-current-line ()
"Return current line as a string."
(elt (cangjie-practice--state :lines)
(cangjie-practice--state :line-index)))
(defun cangjie-practice--state-current-char ()
"Return current char as a string."
(condition-case _
(-some-> (cangjie-practice--state-current-line)
(elt (cangjie-practice--state :char-index))
string)
(args-out-of-range nil)))
(defun cangjie-practice--load-file (file)
"Load FILE."
(setf
(cangjie-practice--state :line-index) 0
(cangjie-practice--state :char-index) 0
(cangjie-practice--state :file-name) file
(cangjie-practice--state :lines)
(->> (f-read-text file)
s-trim
(s-split "\n"))))
(cl-defun cangjie-practice--increment-line (&optional (n 1))
"Increment `:line-index', skipping through empty lines.
Also resets `:char-index' to 0.
If N is non-nil, increment N lines at a time. A value of -1 can
be used for decrementing."
(cl-incf (cangjie-practice--state :line-index) n)
(setf (cangjie-practice--state :char-index) 0)
(while (s-matches? "^[ \t\n\r ]*$" (cangjie-practice--state-current-line))
(cl-incf (cangjie-practice--state :line-index) n)))
(cl-defun cangjie-practice--increment-char (&optional (n 1))
"Increment `:char-index', skipping through non-han characters.
If we finish a line, continue onto the next line.
If N is non-nil, increment N characters at a time. A value of -1
can be used for decrementing."
(cl-incf (cangjie-practice--state :char-index) n)
(cl-block nil
(while t
(cond
((not (cangjie-practice--state-current-char))
(cangjie-practice--increment-line))
((cangjie (cangjie-practice--state-current-char))
(cl-return))
(t
(cl-incf (cangjie-practice--state :char-index) n))))))
(defmacro cangjie-practice--widget (name &rest body)
"Set up widget content update for NAME and run BODY."
(declare (indent 1))
(let ((start-key (intern (concat ":" name "-start")))
(end-key (intern (concat ":" name "-end"))))
`(save-excursion
(-when-let* ((start (cangjie-practice--state ,start-key))
(end (cangjie-practice--state ,end-key)))
(goto-char start)
(delete-region start end))
(setf (cangjie-practice--state ,start-key) (point))
,@body
(setf (cangjie-practice--state ,end-key) (point))
(- (cangjie-practice--state ,end-key) (cangjie-practice--state ,start-key)))))
(defun cangjie-practice--widget-current-char ()
"Insert the current character and its Cangjie code."
(let ((character (cangjie-practice--state-current-char)))
(insert character "\n\n"
(cangjie character) "\n"
(cangjie--han-to-abc
(cangjie character))
"\n\n")))
(defun cangjie-practice--widget-current-line ()
"Insert the current line."
(cangjie-practice--widget "current-line"
(insert (cangjie-practice--trim (cangjie-practice--state-current-line))
"\n\n")
(cangjie-practice--widget-current-char)))
(defun cangjie-practice--widget-input-area ()
"."
(insert "練習區域\n\n"))
(cl-defun cangjie-practice--post-command ()
"Post-command hook."
(unless (eq this-command #'self-insert-command)
(cl-return-from cangjie-practice--post-command))
(let ((inserted-char (string last-command-event)))
(when (equal (cangjie-practice--state-current-char) inserted-char)
(cangjie-practice--increment-char)
(cangjie-practice--widget-current-line))))
(defun cangjie-practice--view-init ()
"."
(erase-buffer)
(setq cangjie-practice--state nil)
(insert "倉頡練習\n\n")
(insert-text-button
"[載入文本]"
'follow-link t
'action (lambda (&rest _)
(and (cangjie-practice--load-file (read-file-name "文本:"))
(cangjie-practice--view-loaded)))))
(defun cangjie-practice--view-loaded ()
"."
(erase-buffer)
(insert "倉頡練習:" (map-elt cangjie-practice--state :file-name) " ")
(insert-text-button
"[載入文本]"
'follow-link t
'action (lambda (&rest _)
(and (cangjie-practice--load-file
(read-file-name "文本:"))
(cangjie-practice--view-loaded))))
(insert "\n\n")
(forward-char (cangjie-practice--widget-current-line))
(cangjie-practice--widget-current-char)
(cangjie-practice--widget-input-area))
;;;###autoload
(defun cangjie-practice ()
"Start a Cangjie practice session."
(interactive)
(let ((buf (pop-to-buffer-same-window
(get-buffer-create "*Cangjie Practice*"))))
(with-current-buffer buf
(cangjie-practice--view-init)
(add-hook 'post-command-hook #'cangjie-practice--post-command nil t))))
(provide 'cangjie-practice)
;;; cangjie-practice.el ends here