;;; goto-addr.el --- click to browse URL or to send to e-mail address

;; Copyright (C) 1995, 2000, 2001, 2002, 2003, 2004,
;;   2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.

;; Author: Eric Ding <ericding@alum.mit.edu>
;; Maintainer: FSF
;; 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 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 <http://www.gnu.org/licenses/>.

;;; 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 [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)
;;
;; The mouse click method is bound to [mouse-2] on highlighted URLs or
;; e-mail addresses only; it functions normally everywhere else.  To bind
;; another mouse click to the function, add the following to your .emacs
;; (for example):
;;
;; (setq goto-address-highlight-keymap
;;   (let ((m (make-sparse-keymap)))
;;     (define-key m [S-mouse-2] 'goto-address-at-point)
;;     m))
;;

;; 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 the buffer is fontified after goto-address-fontify is run
;;   (say, using font-lock-fontify-buffer), then font-lock faces will
;;   override goto-address faces.

;;; Code:

(require 'thingatpt)
(autoload 'browse-url-url-at-point "browse-url")

;; XEmacs needs the following definitions.
(unless (fboundp 'overlays-in)
  (require 'overlay))
(unless (fboundp 'line-beginning-position)
  (defalias 'line-beginning-position 'point-at-bol))
(unless (fboundp 'line-end-position)
  (defalias 'line-end-position 'point-at-eol))
(unless (fboundp 'match-string-no-properties)
  (defalias 'match-string-no-properties 'match-string))

(defgroup goto-address nil
  "Click to browse URL or to send to e-mail address."
  :group 'mouse
  :group 'hypermedia)


;; I don't expect users to want fontify'ing without highlighting.
(defcustom goto-address-fontify-p t
  "*Non-nil means URLs 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
  "*Non-nil means URLs 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 URLs.
A value of t means there is no limit--fontify regardless of the size."
  :type '(choice (integer :tag "Maximum size") (const :tag "No limit" t))
  :group 'goto-address)

(defvar goto-address-mail-regexp
  ;; Actually pretty much any char could appear in the username part.  -stef
  "[-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
   "\\<\\("
   (mapconcat 'identity
              (delete "mailto:"
		      ;; Remove `data:', as it's not terribly useful to follow
		      ;; those.  Leaving them causes `use Data::Dumper;' to be
		      ;; fontified oddly in Perl files.
                      (delete "data:"
                              (copy-sequence thing-at-point-uri-schemes)))
              "\\|")
   "\\)"
   thing-at-point-url-path-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-highlight-keymap
  (let ((m (make-sparse-keymap)))
    (define-key m (if (featurep 'xemacs) (kbd "<button2>") (kbd "<mouse-2>"))
      'goto-address-at-point)
    (define-key m (kbd "C-c RET") 'goto-address-at-point)
    m)
  "Keymap to hold goto-addr's mouse key defs under highlighted URLs.")

(defcustom goto-address-url-face 'link
  "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-unfontify (start end)
  "Remove `goto-address' fontification from the given region."
  (dolist (overlay (overlays-in start end))
    (if (overlay-get overlay 'goto-address)
	(delete-overlay overlay))))

(defvar goto-address-prog-mode)

(defun goto-address-fontify ()
  "Fontify the URLs and e-mail addresses in the current buffer.
This function implements `goto-address-highlight-p'
and `goto-address-fontify-p'."
  ;; Clean up from any previous go.
  (goto-address-unfontify (point-min) (point-max))
  (save-excursion
    (let ((inhibit-point-motion-hooks t))
      (goto-char (point-min))
      (when (or (eq t goto-address-fontify-maximum-size)
		(< (- (point-max) (point)) goto-address-fontify-maximum-size))
	(while (re-search-forward goto-address-url-regexp nil t)
	  (let* ((s (match-beginning 0))
		 (e (match-end 0))
		 this-overlay)
	    (when (or (not goto-address-prog-mode)
		      ;; This tests for both comment and string
		      ;; syntax.
		      (nth 8 (syntax-ppss)))
	      (setq this-overlay (make-overlay s e))
	      (and goto-address-fontify-p
		   (overlay-put this-overlay 'face goto-address-url-face))
	      (overlay-put this-overlay 'evaporate t)
	      (overlay-put this-overlay
			   'mouse-face goto-address-url-mouse-face)
	      (overlay-put this-overlay 'follow-link t)
	      (overlay-put this-overlay
			   'help-echo "mouse-2, C-c RET: follow URL")
	      (overlay-put this-overlay
			   'keymap goto-address-highlight-keymap)
	      (overlay-put this-overlay 'goto-address t))))
	(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)
	    (when (or (not goto-address-prog-mode)
		      ;; This tests for both comment and string
		      ;; syntax.
		      (nth 8 (syntax-ppss)))
	      (setq this-overlay (make-overlay s e))
	      (and goto-address-fontify-p
		   (overlay-put this-overlay 'face goto-address-mail-face))
	      (overlay-put this-overlay 'evaporate t)
	      (overlay-put this-overlay 'mouse-face
			   goto-address-mail-mouse-face)
	      (overlay-put this-overlay 'follow-link t)
	      (overlay-put this-overlay
			   'help-echo "mouse-2, C-c RET: mail this address")
	      (overlay-put this-overlay
			   'keymap goto-address-highlight-keymap)
	      (overlay-put this-overlay 'goto-address t))))))))

(defun goto-address-fontify-region (start end)
  "Fontify URLs and e-mail addresses in the given region."
  (save-excursion
    (save-restriction
      (let ((beg-line (progn (goto-char start) (line-beginning-position)))
	    (end-line (progn (goto-char end) (line-end-position))))
	(narrow-to-region beg-line end-line)
	(goto-address-fontify)))))

;; code to find and goto addresses; much of this has been blatantly
;; snarfed from browse-url.el

;;;###autoload
(define-obsolete-function-alias
  'goto-address-at-mouse 'goto-address-at-point "22.1")

;;;###autoload
(defun goto-address-at-point (&optional event)
  "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 (list last-input-event))
  (save-excursion
    (if event (posn-set-point (event-end event)))
    (let ((address (save-excursion (goto-address-find-address-at-point))))
      (if (and address
	       (save-excursion
		 (goto-char (previous-single-char-property-change
			     (point) 'goto-address nil
			     (line-beginning-position)))
		 (not (looking-at goto-address-url-regexp))))
	  (compose-mail address)
	(let ((url (browse-url-url-at-point)))
	  (if url
	      (browse-url url)
	    (error "No e-mail address or URL found")))))))

(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 nil."
  (re-search-backward "[^-_A-z0-9.@]" (line-beginning-position) 'lim)
  (if (or (looking-at goto-address-mail-regexp)	; already at start
	  (and (re-search-forward goto-address-mail-regexp
				  (line-end-position) 'lim)
	       (goto-char (match-beginning 0))))
      (match-string-no-properties 0)))

;;;###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 `goto-address-at-point' to mouse-2 and C-c RET
only on URLs and e-mail addresses.

Also fontifies the buffer appropriately (see `goto-address-fontify-p' and
`goto-address-highlight-p' for more information)."
  (interactive)
  (if goto-address-highlight-p
      (goto-address-fontify)))
;;;###autoload(put 'goto-address 'safe-local-eval-function t)

;;;###autoload
(define-minor-mode goto-address-mode
  "Minor mode to buttonize URLs and e-mail addresses in the current buffer."
  nil
  ""
  nil
  (if goto-address-mode
      (jit-lock-register #'goto-address-fontify-region)
    (jit-lock-unregister #'goto-address-fontify-region)
    (save-restriction
      (widen)
      (goto-address-unfontify (point-min) (point-max)))))

;;;###autoload
(define-minor-mode goto-address-prog-mode
  "Turn on `goto-address-mode', but only in comments and strings."
  nil
  ""
  nil
  (if goto-address-prog-mode
      (jit-lock-register #'goto-address-fontify-region)
    (jit-lock-unregister #'goto-address-fontify-region)
    (save-restriction
      (widen)
      (goto-address-unfontify (point-min) (point-max)))))

(provide 'goto-addr)

;; arch-tag: ca47c505-5661-425d-a471-62bc6e75cf0a
;;; goto-addr.el ends here
