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popweb-latex.el
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popweb-latex.el
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;;; popweb-latex.el --- Katex.js previewer plugin
;; Filename: popweb-latex.el
;; Description: Katex.js previewer plugin
;; Author: Andy Stewart <lazycat.manatee@gmail.com>
;; Maintainer: Andy Stewart <lazycat.manatee@gmail.com>
;; Copyright (C) 2021, Andy Stewart, all rights reserved.
;; Created: 2021-11-15 20:04:09
;; Version: 0.1
;; Last-Updated: Sat Nov 20 04:34:02 2021 (-0500)
;; By: Mingde (Matthew) Zeng
;; URL: https://www.github.org/manateelazycat/popweb-latex
;; Keywords:
;; Compatibility: GNU Emacs 29.0.50
;;
;; Features that might be required by this library:
;;
;;
;;
;;; This file is NOT part of GNU Emacs
;;; License
;;
;; 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, 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; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth
;; Floor, Boston, MA 02110-1301, USA.
;;; Commentary:
;;
;; Katex.js previewer plugin
;;
;;; Installation:
;;
;; Put popweb-latex.el to your load-path.
;; The load-path is usually ~/elisp/.
;; It's set in your ~/.emacs like this:
;; (add-to-list 'load-path (expand-file-name "~/elisp"))
;;
;; And the following to your ~/.emacs startup file.
;;
;; (require 'popweb-latex)
;;
;; No need more.
;;; Customize:
;;
;;
;;
;; All of the above can customize by:
;; M-x customize-group RET popweb-latex RET
;;
;;; Change log:
;;
;; 2021/11/15
;; * First released.
;;
;;; Acknowledgements:
;;
;;
;;
;;; TODO
;;
;;
;;
;;; Require
(require 'dash)
(require 'popweb)
(require 'math-at-point)
;;; Code:
(defvar popweb-latex-current-buffer nil
"The current buffer.")
(setq popweb-latex-index-path (concat (file-name-directory load-file-name) "index.html"))
(defun popweb-latex-preview (info)
(let* ((position (popweb-get-cursor-coordinate))
(x (car position))
(y (cdr position))
(x-offset (popweb-get-cursor-x-offset))
(y-offset (popweb-get-cursor-y-offset))
(width 0.1)
(height 0.1)
(show-window (nth 0 info))
(latex-string (nth 1 info)))
(popweb-call-async "pop_latex_window" "latex" x y x-offset y-offset width height popweb-latex-index-path show-window latex-string)))
(defun popweb-latex-show ()
(interactive)
(let* ((math-at-point (webkit-katex-render--math-at-point))
(pos (car math-at-point))
(latex-string (nth 1 math-at-point)))
(if latex-string
(if (not (eq latex-string webkit-katex-render--previous-math))
(progn
(popweb-start 'popweb-latex-preview (list t
(replace-regexp-in-string "\\\\" "\\\\" latex-string t t)))
(setq webkit-katex-render--previous-math latex-string)))
(popweb-start 'popweb-latex-preview (list nil "e^{i\\\\pi}+1=0"))))
(add-hook 'post-command-hook #'popweb-latex-update nil t))
(defun popweb-latex-update ()
(interactive)
(when (popweb-epc-live-p popweb-epc-process)
(let* ((math-at-point (webkit-katex-render--math-at-point))
(latex-string (nth 1 math-at-point))
(position (popweb-get-cursor-coordinate))
(x (car position))
(y (cdr position))
(x-offset (popweb-get-cursor-x-offset))
(y-offset (popweb-get-cursor-y-offset))
(width 0.1)
(height 0.1))
(if latex-string
(if (not (eq latex-string webkit-katex-render--previous-math))
(progn
(popweb-call-async "pop_latex_window" "latex"
x y x-offset y-offset width height popweb-latex-index-path
t
(--> latex-string
(replace-regexp-in-string "\\\\" "\\\\" it t t)
(replace-regexp-in-string "\n" "" it t t)))
(setq webkit-katex-render--previous-math latex-string)))
(popweb-latex-hide)))))
(defun popweb-latex-hide ()
(interactive)
(ignore-errors
(popweb-call-async "hide_web_window" "latex")))
(defun popweb-latex-hide-after-switch-buffer ()
(unless (equal (current-buffer) popweb-latex-current-buffer)
(popweb-latex-hide)))
(defun popweb-latex-hide-after-lose-focus ()
(if (frame-focus-state)
(popweb-latex-update)
(popweb-latex-hide)))
;;;###autoload
(define-minor-mode popweb-latex-mode
"Toggle popweb-latex-mode"
nil nil nil
(if popweb-latex-mode
(progn
(setq popweb-latex-current-buffer (current-buffer))
(popweb-latex-show)
(add-hook 'buffer-list-update-hook 'popweb-latex-hide-after-switch-buffer)
(add-function :after after-focus-change-function #'popweb-latex-hide-after-lose-focus))
(remove-hook 'buffer-list-update-hook 'popweb-latex-hide-after-switch-buffer)
(remove-hook 'post-command-hook #'popweb-latex-update t)
(remove-function after-focus-change-function #'popweb-latex-hide-after-lose-focus)
(popweb-latex-hide)))
(provide 'popweb-latex)
;;; popweb-latex.el ends here