176 lines
6 KiB
EmacsLisp
176 lines
6 KiB
EmacsLisp
;;; erc-tex.el --- LaTeX mathematical expressions rendering for ERC
|
|
|
|
;; Copyright (C) 2009 David Vazquez
|
|
|
|
;; Last-modified: <2009-09-14 02:11:53 david>
|
|
|
|
;; Authors: David Vazquez <davazp@es.gnu.org>
|
|
;; Created: 12 Sep 2009
|
|
;; Keywords: comm, tex
|
|
|
|
;; 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 file 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 GNU Emacs; see the file COPYING. If not, write to
|
|
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
;; Boston, MA 02110-1301, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
;; erc-tex is a tiny ERC module which render LaTeX mathematical expressions
|
|
;; in your ERC chats. You will need both latex and dvipng in order to use this
|
|
;; module.
|
|
;;
|
|
;; Once erc-tex is avalaible for your Emacs, you can use `erc-tex-mode' to
|
|
;; toggle the module. This will render the text between $...$ as a LaTeX
|
|
;; expression. Indeed, you can use `erc-tex-image-edit', bound to `RET' on TeX
|
|
;; formulas to edit the TeX code in the prompt and resend the image.
|
|
|
|
;;; TODO:
|
|
;; - Highlight the formulas according to ERC faces as erc-track.
|
|
|
|
;;; Code:
|
|
|
|
(eval-when-compile (require 'cl-lib))
|
|
(require 'erc)
|
|
|
|
|
|
(defvar erc-tex-latex-program "latex"
|
|
"Program name for invoking LaTeX.")
|
|
|
|
(defvar erc-tex-dvipng-program "dvipng"
|
|
"Program name for invoking dvipng.")
|
|
|
|
(defvar erc-tex-image-size 1.2
|
|
"Ratio of magnification.")
|
|
|
|
|
|
;; Error condition signaled when it cannot render a LaTeX expression.
|
|
(put 'erc-tex-bad-expression-error
|
|
'error-conditions '(error erc-tex-bad-expression-error))
|
|
|
|
|
|
(defsubst erc-tex-run-latex (&rest arguments)
|
|
"Launch LaTeX program with some arguments."
|
|
(unless (zerop (apply #'call-process erc-tex-latex-program nil nil nil arguments))
|
|
(signal 'erc-tex-bad-expression-error nil)))
|
|
|
|
(defsubst erc-tex-run-dvipng (&rest arguments)
|
|
"Launch dvipng program with some arguments."
|
|
(unless (zerop (apply #'call-process erc-tex-dvipng-program nil nil nil arguments))
|
|
(signal 'erc-tex-bad-expression-error nil)))
|
|
|
|
;; Call to latex and dvipng in order to build a PNG image from the LaTeX
|
|
;; expression MATH-STRING. Return the image descriptor if it was sucessful,
|
|
;; NIL otherwise.
|
|
(defun erc-tex-make-image (math-expression fg bg)
|
|
(condition-case nil
|
|
(let* ((prefix (concat temporary-file-directory (make-temp-name "erc-tex-")))
|
|
(tex-file (concat prefix ".tex"))
|
|
(dvi-file (concat prefix ".dvi"))
|
|
(png-file (concat prefix ".png")))
|
|
|
|
(with-temp-file tex-file
|
|
(insert "\\documentclass{article}\n"
|
|
"\\pagestyle{empty}\n"
|
|
"\\usepackage{amsmath, amssymb, amsthm}\n"
|
|
"\\begin{document}\n"
|
|
"\\par\n"
|
|
"$" math-expression "$"
|
|
"\\end{document}\n"))
|
|
|
|
(erc-tex-run-latex (concat "-output-directory=" temporary-file-directory) tex-file)
|
|
|
|
(cl-flet ((colorize (color)
|
|
;; Return a string which stand for COLOR in the format that
|
|
;; dvipng understands.
|
|
(let ((max (car (color-values "#ffffff"))))
|
|
(cl-destructuring-bind (r g b)
|
|
(color-values color)
|
|
(format "rgb %.02f %.02f %.02f"
|
|
(/ (float r) max)
|
|
(/ (float g) max)
|
|
(/ (float b) max))))))
|
|
|
|
(erc-tex-run-dvipng "-x" (number-to-string (floor (* 1000 erc-tex-image-size)))
|
|
"-T" "tight"
|
|
"-fg" (colorize fg)
|
|
"-bg" (colorize bg)
|
|
"-o" png-file
|
|
dvi-file))
|
|
(delete-file tex-file)
|
|
(delete-file dvi-file)
|
|
(create-image png-file 'png nil :margin '(0 . 5) :ascent 'center))
|
|
|
|
((erc-tex-bad-expression-error)
|
|
;; We do not delete auxiliary files if any error ocurred.
|
|
)))
|
|
|
|
|
|
|
|
(defvar erc-tex-image-keymap
|
|
(let ((keymap (make-sparse-keymap)))
|
|
(define-key keymap (kbd "RET") 'erc-tex-image-edit)
|
|
keymap))
|
|
|
|
(defun erc-tex-image-edit ()
|
|
(interactive)
|
|
(let* ((start (point))
|
|
(i start)
|
|
(prop (get-char-property i 'display)))
|
|
(while (eq prop (get-char-property i 'display))
|
|
(setq i (1+ i)))
|
|
(goto-char (point-max))
|
|
(insert (buffer-substring-no-properties start i))))
|
|
|
|
(defun erc-tex-render (&optional fg bg)
|
|
(let ((fg (or fg (face-foreground 'default)))
|
|
(bg (or bg (face-background 'default))))
|
|
(goto-char (point-min))
|
|
(while (re-search-forward "\\$[^$]*\\$" nil t)
|
|
(let* ((match (match-string-no-properties 0))
|
|
(descp (erc-tex-make-image match fg bg)))
|
|
(when descp
|
|
(let (start end)
|
|
(delete-region (match-beginning 0) (match-end 0))
|
|
(setq start (point))
|
|
(insert-image descp match)
|
|
(setq end (point))
|
|
(put-text-property start end 'keymap erc-tex-image-keymap)))))))
|
|
|
|
|
|
;;; Minor mode
|
|
|
|
(defun erc-tex-render-insert ()
|
|
(erc-tex-render))
|
|
|
|
(defun erc-tex-render-send ()
|
|
(erc-tex-render
|
|
(face-foreground 'erc-input-face)
|
|
(face-background 'erc-input-face)))
|
|
|
|
(define-erc-module tex latex
|
|
"Display LaTeX mathematical expressions as images in ERC."
|
|
((add-hook 'erc-insert-modify-hook 'erc-tex-render-insert t)
|
|
(add-hook 'erc-send-modify-hook 'erc-tex-render-send t))
|
|
((remove-hook 'erc-insert-modify-hook 'erc-tex-render-insert)
|
|
(remove-hook 'erc-send-modify-hook 'erc-tex-render-send)))
|
|
|
|
|
|
(provide 'erc-tex)
|
|
|
|
;; Local variables:
|
|
;; fill-column: 78
|
|
;; indent-tabs-mode: nil
|
|
;; time-stamp-pattern: "10/^;; Last-modified: <%%>$"
|
|
;; End:
|
|
|
|
;;; erc-tex.el ends here
|