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;;; goto-addr.el --- click to browse URL or to send to e-mail address
;; Copyright (C) 1995 Free Software Foundation, Inc.
;; Author: Eric Ding <ericding@mit.edu>
;; Maintainer: Eric Ding <ericding@mit.edu>
;; Created: 15 Aug 1995
;; Keywords: mh-e, www, mouse, mail
;; 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 2, 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; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; This package allows you to click or hit a key sequence while on a
;; URL or e-mail address, and either load the URL into a browser of
;; your choice using the browse-url package, or if it's an e-mail
;; address, to send an e-mail to that address. By default, we bind to
;; the [S-mouse-2] and the [C-c return] key sequences.
;; INSTALLATION
;;
;; To use goto-address in a particular mode (for example, while
;; reading mail in mh-e), add something like this in your .emacs file:
;;
;; (add-hook 'mh-show-mode-hook 'goto-address)
;;
;; By default, goto-address now sends using `mail' instead of `mh-send'.
;; To use mh-e to send mail, add the following to your .emacs file:
;;
;; (setq goto-address-mail-method 'goto-address-send-using-mhe)
;;
;; To rebind, for example, the mouse click method to [mouse-2] in
;; mh-show-mode, add the following (instead of the first add-hook example
;; above) to your .emacs file:
;;
;; (defun my-goto-address ()
;; (goto-address)
;; (local-unset-key [S-mouse-2])
;; (local-set-key [mouse-2] 'goto-address-at-mouse))
;;
;; (add-hook 'mh-show-mode-hook 'my-goto-address)
;;
;; [mouse-2] is not the default mouse binding because I use goto-address in
;; some editable buffers, where [mouse-2] means mouse-yank-at-click, as well
;; as in some modes where [mouse-2] is bound to other useful functions.
;; BUG REPORTS
;;
;; Please send bug reports to me at ericding@mit.edu.
;; Known bugs/features:
;; * goto-address-mail-regexp only catches foo@bar.org style addressing,
;; not stuff like X.400 addresses, etc.
;; * regexp also catches Message-Id line, since it is in the format of
;; an Internet e-mail address (like Compuserve addresses)
;; * If show buffer is fontified after goto-address-fontify is run
;; (say, using font-lock-fontify-buffer), then font-lock face will
;; override goto-address faces.
;;; Code:
(require 'browse-url)
;;; I don't expect users to want fontify'ing without highlighting.
(defvar goto-address-fontify-p t
"*If t, URL's and e-mail addresses in buffer are fontified.
But only if `goto-address-highlight-p' is also non-nil.")
(defvar goto-address-highlight-p t
"*If t, URL's and e-mail addresses in buffer are highlighted.")
(defvar goto-address-fontify-maximum-size 30000
"*Maximum size of file in which to fontify and/or highlight URL's.")
(defvar goto-address-mail-regexp
"[-a-zA-Z0-9._]+@\\([-a-zA-z0-9_]+\\.\\)+[a-zA-Z0-9]+"
"A regular expression probably matching an e-mail address.")
(defvar goto-address-url-regexp
(concat "\\b\\(s?https?\\|ftp\\|file\\|gopher\\|news\\|"
"telnet\\|wais\\):\\(//[-a-zA-Z0-9_.]+:"
"[0-9]*\\)?[-a-zA-Z0-9_=?#$@~`%&*+|\\/.,]*"
"[-a-zA-Z0-9_=#$@~`%&*+|\\/]")
"A regular expression probably matching a URL.")
(defvar goto-address-mail-method
'goto-address-send-using-mail
"*Function to compose mail.
Two pre-made functions are `goto-address-send-using-mail' (sendmail);
and `goto-address-send-using-mhe' (MH-E).")
(defun goto-address-fontify ()
"Fontify the URL's and e-mail addresses in the current buffer.
This function implements `goto-address-highlight-p'
and `goto-address-fontify-p'."
(save-excursion
(let ((inhibit-read-only t)
(inhibit-point-motion-hooks t)
(modified (buffer-modified-p)))
(goto-char (point-min))
(if (< (- (point-max) (point)) goto-address-fontify-maximum-size)
(progn
(while (re-search-forward goto-address-url-regexp nil t)
(progn
(goto-char (match-end 0))
(and goto-address-fontify-p
(put-text-property (match-beginning 0) (match-end 0)
'face 'bold))
(put-text-property (match-beginning 0) (match-end 0)
'mouse-face 'highlight)))
(goto-char (point-min))
(while (re-search-forward goto-address-mail-regexp nil t)
(progn
(goto-char (match-end 0))
(and goto-address-fontify-p
(put-text-property (match-beginning 0) (match-end 0)
'face 'italic))
(put-text-property (match-beginning 0) (match-end 0)
'mouse-face 'secondary-selection)))))
(and (buffer-modified-p)
(not modified)
(set-buffer-modified-p nil)))))
;;; code to find and goto addresses; much of this has been blatantly
;;; snarfed from browse-url.el
(defun goto-address-at-mouse (event)
"Send to the e-mail address or load the URL clicked with the mouse.
Send mail to address at position of mouse click. See documentation for
`goto-address-find-address-at-point'. If no address is found
there, then load the URL at or before the position of the mouse click."
(interactive "e")
(save-excursion
(let ((posn (event-start event)))
(set-buffer (window-buffer (posn-window posn)))
(goto-char (posn-point posn))
(let ((address
(save-excursion (goto-address-find-address-at-point))))
(if (string-equal address "")
(let ((url (browse-url-url-at-point)))
(if (string-equal url "")
(error "No e-mail address or URL found")
(funcall browse-url-browser-function url)))
(funcall goto-address-mail-method address))))))
(defun goto-address-at-point ()
"Send to the e-mail address or load the URL at point.
Send mail to address at point. See documentation for
`goto-address-find-address-at-point'. If no address is found
there, then load the URL at or before point."
(interactive)
(save-excursion
(let ((address (save-excursion (goto-address-find-address-at-point))))
(if (string-equal address "")
(let ((url (browse-url-url-at-point)))
(if (string-equal url "")
(error "No e-mail address or URL found")
(funcall browse-url-browser-function url)))
(funcall goto-address-mail-method address)))))
(defun goto-address-find-address-at-point ()
"Find e-mail address around or before point.
Then search backwards to beginning of line for the start of an e-mail
address. If no e-mail address found, return the empty string."
(let ((bol (save-excursion (beginning-of-line) (point))))
(re-search-backward "[^-_A-z0-9.@]" bol 'lim)
(if (or (looking-at goto-address-mail-regexp) ; already at start
(let ((eol (save-excursion (end-of-line) (point))))
(and (re-search-forward goto-address-mail-regexp eol 'lim)
(goto-char (match-beginning 0)))))
(buffer-substring (match-beginning 0) (match-end 0))
"")))
(defun goto-address-send-using-mhe (to)
(mh-find-path)
(let ((cc (mh-read-address "Cc: "))
(subject (read-string "Subject: "))
(config (current-window-configuration)))
(delete-other-windows)
(mh-send-sub to cc subject config)))
(defun goto-address-send-using-mail (to)
(mail-other-window nil to)
(and (goto-char (point-min))
(end-of-line 2)))
;;;###autoload
(defun goto-address ()
"Sets up goto-address functionality in the current buffer.
Allows user to use mouse/keyboard command to click to go to a URL
or to send e-mail.
By default, goto-address binds to S-mouse-2 and C-c RET.
Also fontifies the buffer appropriately (see `goto-address-fontify-p' and
`goto-address-highlight-p' for more information)."
(interactive)
(local-set-key [S-mouse-2] 'goto-address-at-mouse)
(local-set-key "\C-c\r" 'goto-address-at-point)
(if goto-address-highlight-p
(goto-address-fontify)))
(provide 'goto-addr)
;;; goto-addr.el ends here.
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