(require 'browse-url)
(defgroup goto-address nil
"Click to browse URL or to send to e-mail address."
:group 'mouse
:group 'hypermedia)
(defcustom 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."
:type 'boolean
:group 'goto-address)
(defcustom goto-address-highlight-p t
"*If t, URL's and e-mail addresses in buffer are highlighted."
:type 'boolean
:group 'goto-address)
(defcustom goto-address-fontify-maximum-size 30000
"*Maximum size of file in which to fontify and/or highlight URL's."
:type 'integer
:group 'goto-address)
(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.")
(defcustom 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-mh-e' (MH-E)."
:type 'function
:group 'goto-address)
(defvar goto-address-highlight-keymap
(let ((m (make-sparse-keymap)))
(define-key m [mouse-2] 'goto-address-at-mouse)
m)
"keymap to hold goto-addr's mouse key defs under highlighted URLs.")
(defcustom goto-address-url-face 'bold
"*Face to use for URLs."
:type 'face
:group 'goto-address)
(defcustom goto-address-url-mouse-face 'highlight
"*Face to use for URLs when the mouse is on them."
:type 'face
:group 'goto-address)
(defcustom goto-address-mail-face 'italic
"*Face to use for e-mail addresses."
:type 'face
:group 'goto-address)
(defcustom goto-address-mail-mouse-face 'secondary-selection
"*Face to use for e-mail addresses when the mouse is on them."
:type 'face
:group 'goto-address)
(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)
(let* ((s (match-beginning 0))
(e (match-end 0))
(this-overlay (make-overlay s e)))
(and goto-address-fontify-p
(overlay-put this-overlay 'face goto-address-url-face))
(overlay-put this-overlay
'mouse-face goto-address-url-mouse-face)
(overlay-put this-overlay
'local-map goto-address-highlight-keymap)))
(goto-char (point-min))
(while (re-search-forward goto-address-mail-regexp nil t)
(let* ((s (match-beginning 0))
(e (match-end 0))
(this-overlay (make-overlay s e)))
(and goto-address-fontify-p
(overlay-put this-overlay 'face goto-address-mail-face))
(overlay-put this-overlay 'mouse-face
goto-address-mail-mouse-face)
(overlay-put this-overlay
'local-map goto-address-highlight-keymap)))))
(and (buffer-modified-p)
(not modified)
(set-buffer-modified-p nil)))))
(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")
(browse-url 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")
(browse-url 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) (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-mh-e (to)
(require 'mh-comp)
(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)))
(fset 'goto-address-send-using-mhe 'goto-address-send-using-mh-e)
(defun goto-address-send-using-mail (to)
(mail-other-window nil to)
(and (goto-char (point-min))
(end-of-line 2)))
(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 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 "\C-c\r" 'goto-address-at-point)
(if goto-address-highlight-p
(goto-address-fontify)))
(provide 'goto-addr)