;;; html2text.el --- a simple html to plain text converter -*- coding: utf-8 -*- ;; Copyright (C) 2002-2015 Free Software Foundation, Inc. ;; Author: Joakim Hove ;; This file is part of GNU Emacs. ;; GNU Emacs 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. ;; GNU Emacs 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. If not, see . ;;; Commentary: ;; These functions provide a simple way to wash/clean html infected ;; mails. Definitely do not work in all cases, but some improvement ;; in readability is generally obtained. Formatting is only done in ;; the buffer, so the next time you enter the article it will be ;; "re-htmlized". ;; ;; The main function is `html2text'. ;;; Code: ;; ;; ;; (eval-when-compile (require 'cl)) (defvar html2text-format-single-element-list '(("hr" . html2text-clean-hr))) (defvar html2text-replace-list '(("´" . "`") ("&" . "&") ("'" . "'") ("¦" . "|") ("¢" . "c") ("ˆ" . "^") ("©" . "(C)") ("¤" . "(#)") ("°" . "degree") ("÷" . "/") ("€" . "e") ("½" . "1/2") (">" . ">") ("¿" . "?") ("«" . "<<") ("&ldquo" . "\"") ("‹" . "(") ("‘" . "`") ("<" . "<") ("—" . "--") (" " . " ") ("–" . "-") ("‰" . "%%") ("±" . "+-") ("£" . "£") (""" . "\"") ("»" . ">>") ("&rdquo" . "\"") ("®" . "(R)") ("›" . ")") ("’" . "'") ("§" . "§") ("¹" . "^1") ("²" . "^2") ("³" . "^3") ("˜" . "~")) "The map of entity to text. This is an alist were each element is a dotted pair consisting of an old string, and a replacement string. This replacement is done by the function `html2text-substitute' which basically performs a `replace-string' operation for every element in the list. This is completely verbatim - without any use of REGEXP.") (defvar html2text-remove-tag-list '("html" "body" "p" "img" "dir" "head" "div" "br" "font" "title" "meta") "A list of removable tags. This is a list of tags which should be removed, without any formatting. Note that tags in the list are presented *without* any \"<\" or \">\". All occurrences of a tag appearing in this list are removed, irrespective of whether it is a closing or opening tag, or if the tag has additional attributes. The deletion is done by the function `html2text-remove-tags'. For instance the text: \"Here comes something big .\" will be reduced to: \"Here comes something big.\" If this list contains the element \"font\".") (defvar html2text-format-tag-list '(("b" . html2text-clean-bold) ("strong" . html2text-clean-bold) ("u" . html2text-clean-underline) ("i" . html2text-clean-italic) ("em" . html2text-clean-italic) ("blockquote" . html2text-clean-blockquote) ("a" . html2text-clean-anchor) ("ul" . html2text-clean-ul) ("ol" . html2text-clean-ol) ("dl" . html2text-clean-dl) ("center" . html2text-clean-center)) "An alist of tags and processing functions. This is an alist where each dotted pair consists of a tag, and then the name of a function to be called when this tag is found. The function is called with the arguments p1, p2, p3 and p4. These are demonstrated below: \" This is bold text \" ^ ^ ^ ^ | | | | p1 p2 p3 p4 Then the called function will typically format the text somewhat and remove the tags.") (defvar html2text-remove-tag-list2 '("li" "dt" "dd" "meta") "Another list of removable tags. This is a list of tags which are removed similarly to the list `html2text-remove-tag-list' - but these tags are retained for the formatting, and then moved afterward.") ;; ;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; (defun html2text-replace-string (from-string to-string min max) "Replace FROM-STRING with TO-STRING in region from MIN to MAX." (goto-char min) (let ((delta (- (string-width to-string) (string-width from-string))) (change 0)) (while (search-forward from-string max t) (replace-match to-string) (setq change (+ change delta))) change)) ;; ;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; i.e. ;; (defun html2text-attr-value (list attribute) "Get value of ATTRIBUTE from LIST." (nth 1 (assoc attribute list))) (defun html2text-get-attr (p1 p2) (goto-char p1) (re-search-forward "\\s-+" p2 t) (let (attr-list) (while (re-search-forward "[-a-z0-9._]+" p2 t) (setq attr-list (cons (list (match-string 0) (when (looking-at "\\s-*=") (goto-char (match-end 0)) (skip-chars-forward "[:space:]") (when (or (looking-at "\"[^\"]*\"\\|'[^']*'") (looking-at "[-a-z0-9._:]+")) (goto-char (match-end 0)) (match-string 0)))) attr-list))) attr-list)) ;; ;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; (defun html2text-clean-list-items (p1 p2 list-type) (goto-char p1) (let ((item-nr 0) (items 0)) (while (search-forward "
  • " p2 t) (setq items (1+ items))) (goto-char p1) (while (< item-nr items) (setq item-nr (1+ item-nr)) (search-forward "
  • " (point-max) t) (cond ((string= list-type "ul") (insert " o ")) ((string= list-type "ol") (insert (format " %s: " item-nr))) (t (insert " x ")))))) (defun html2text-clean-dtdd (p1 p2) (goto-char p1) (let ((items 0) (item-nr 0)) (while (search-forward "
    " p2 t) (setq items (1+ items))) (goto-char p1) (while (< item-nr items) (setq item-nr (1+ item-nr)) (re-search-forward "
    \\([ ]*\\)" (point-max) t) (when (match-string 1) (delete-region (point) (- (point) (string-width (match-string 1))))) (let ((def-p1 (point)) (def-p2 0)) (re-search-forward "\\([ ]*\\)\\(
    \\|
    \\)" (point-max) t) (if (match-string 1) (progn (let* ((mw1 (string-width (match-string 1))) (mw2 (string-width (match-string 2))) (mw (+ mw1 mw2))) (goto-char (- (point) mw)) (delete-region (point) (+ (point) mw1)) (setq def-p2 (point)))) (setq def-p2 (- (point) (string-width (match-string 2))))) (put-text-property def-p1 def-p2 'face 'bold))))) (defun html2text-delete-tags (p1 p2 p3 p4) (delete-region p1 p2) (delete-region (- p3 (- p2 p1)) (- p4 (- p2 p1)))) (defun html2text-delete-single-tag (p1 p2) (delete-region p1 p2)) (defun html2text-clean-hr (p1 p2) (html2text-delete-single-tag p1 p2) (goto-char p1) (newline 1) (insert (make-string fill-column ?-))) (defun html2text-clean-ul (p1 p2 p3 p4) (html2text-delete-tags p1 p2 p3 p4) (html2text-clean-list-items p1 (- p3 (- p1 p2)) "ul")) (defun html2text-clean-ol (p1 p2 p3 p4) (html2text-delete-tags p1 p2 p3 p4) (html2text-clean-list-items p1 (- p3 (- p1 p2)) "ol")) (defun html2text-clean-dl (p1 p2 p3 p4) (html2text-delete-tags p1 p2 p3 p4) (html2text-clean-dtdd p1 (- p3 (- p1 p2)))) (defun html2text-clean-center (p1 p2 p3 p4) (html2text-delete-tags p1 p2 p3 p4) (center-region p1 (- p3 (- p2 p1)))) (defun html2text-clean-bold (p1 p2 p3 p4) (put-text-property p2 p3 'face 'bold) (html2text-delete-tags p1 p2 p3 p4)) (defun html2text-clean-title (p1 p2 p3 p4) (put-text-property p2 p3 'face 'bold) (html2text-delete-tags p1 p2 p3 p4)) (defun html2text-clean-underline (p1 p2 p3 p4) (put-text-property p2 p3 'face 'underline) (html2text-delete-tags p1 p2 p3 p4)) (defun html2text-clean-italic (p1 p2 p3 p4) (put-text-property p2 p3 'face 'italic) (html2text-delete-tags p1 p2 p3 p4)) (defun html2text-clean-font (p1 p2 p3 p4) (html2text-delete-tags p1 p2 p3 p4)) (defun html2text-clean-blockquote (p1 p2 p3 p4) (html2text-delete-tags p1 p2 p3 p4)) (defun html2text-clean-anchor (p1 p2 p3 p4) ;; If someone can explain how to make the URL clickable I will surely ;; improve upon this. ;; Maybe `goto-addr.el' can be used here. (let* ((attr-list (html2text-get-attr p1 p2)) (href (html2text-attr-value attr-list "href"))) (delete-region p1 p4) (when href (goto-char p1) (insert (if (string-match "\\`['\"].*['\"]\\'" href) (substring href 1 -1) href)) (put-text-property p1 (point) 'face 'bold)))) ;; ;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; (defun html2text-fix-paragraph (p1 p2) (goto-char p1) (let ((refill-start) (refill-stop)) (when (re-search-forward "
    $" p2 t) (goto-char p1) (when (re-search-forward ".+[^<][^b][^r][^>]$" p2 t) (beginning-of-line) (setq refill-start (point)) (goto-char p2) (re-search-backward ".+[^<][^b][^r][^>]$" refill-start t) (forward-line 1) (end-of-line) ;; refill-stop should ideally be adjusted to ;; accommodate the "
    " strings which are removed ;; between refill-start and refill-stop. Can simply ;; be returned from my-replace-string (setq refill-stop (+ (point) (html2text-replace-string "
    " "" refill-start (point)))) ;; (message "Point = %s refill-stop = %s" (point) refill-stop) ;; (sleep-for 4) (fill-region refill-start refill-stop)))) (html2text-replace-string "
    " "" p1 p2)) ;; ;; This one is interactive ... ;; (defun html2text-fix-paragraphs () "This _tries_ to fix up the paragraphs - this is done in quite a ad-hook fashion, quite close to pure guess-work. It does work in some cases though." (interactive) (goto-char (point-min)) (while (re-search-forward "^
    $" nil t) (delete-region (match-beginning 0) (match-end 0))) ;; Removing lonely
    on a single line, if they are left intact we ;; don't have any paragraphs at all. (goto-char (point-min)) (while (not (eobp)) (let ((p1 (point))) (forward-paragraph 1) ;;(message "Kaller fix med p1=%s p2=%s " p1 (1- (point))) (sleep-for 5) (html2text-fix-paragraph p1 (1- (point))) (goto-char p1) (when (not (eobp)) (forward-paragraph 1))))) ;; ;;
    ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; (defun html2text-remove-tags (tag-list) "Removes the tags listed in the list `html2text-remove-tag-list'. See the documentation for that variable." (interactive) (dolist (tag tag-list) (goto-char (point-min)) (while (re-search-forward (format "\\(]*>\\)" tag) (point-max) t) (delete-region (match-beginning 0) (match-end 0))))) (defun html2text-format-tags () "See the variable `html2text-format-tag-list' for documentation." (interactive) (dolist (tag-and-function html2text-format-tag-list) (let ((tag (car tag-and-function)) (function (cdr tag-and-function))) (goto-char (point-min)) (while (re-search-forward (format "\\(<%s\\( [^>]*\\)?>\\)" tag) (point-max) t) (let ((p1) (p2 (point)) (p3) (p4)) (search-backward "<" (point-min) t) (setq p1 (point)) (unless (search-forward (format "" tag) (point-max) t) (goto-char p2) (insert (format "" tag))) (setq p4 (point)) (search-backward "]*\\)?>\\)" tag) (point-max) t) (let ((p1) (p2 (point))) (search-backward "<" (point-min) t) (setq p1 (point)) (funcall function p1 p2)))))) ;; ;; Main function ;; ;;;###autoload (defun html2text () "Convert HTML to plain text in the current buffer." (interactive) (save-excursion (let ((case-fold-search t) (buffer-read-only)) (html2text-remove-tags html2text-remove-tag-list) (html2text-format-tags) (html2text-remove-tags html2text-remove-tag-list2) (html2text-substitute) (html2text-format-single-elements) (html2text-fix-paragraphs)))) ;; ;; ;; (provide 'html2text) ;;; html2text.el ends here