+ (lambda ()
+ (if (re-search-backward (concat "[^" thing-at-point-file-name-chars "]")
+ nil t)
+ (forward-char)
+ (goto-char (point-min)))))
+
+(defvar thing-at-point-url-path-regexp
+ "[^]\t\n \"'()<>[^`{}]*[^]\t\n \"'()<>[^`{}.,;]+"
+ "A regular expression probably matching the host and filename or e-mail part of a URL.")
+
+(defvar thing-at-point-short-url-regexp
+ (concat "[-A-Za-z0-9.]+" thing-at-point-url-path-regexp)
+ "A regular expression probably matching a URL without an access scheme.
+Hostname matching is stricter in this case than for
+``thing-at-point-url-regexp''.")
+
+(defvar thing-at-point-uri-schemes
+ ;; Officials from http://www.iana.org/assignments/uri-schemes
+ '("ftp://" "http://" "gopher://" "mailto:" "news:" "nntp:"
+ "telnet://" "wais://" "file:/" "prospero:" "z39.50s:" "z39.50r:"
+ "cid:" "mid:" "vemmi:" "service:" "imap:" "nfs:" "acap:" "rtsp:"
+ "tip:" "pop:" "data:" "dav:" "opaquelocktoken:" "sip:" "tel:" "fax:"
+ "modem:" "ldap:" "https://" "soap.beep:" "soap.beeps:" "urn:" "go:"
+ "afs:" "tn3270:" "mailserver:"
+ ;; Compatibility
+ "snews:")
+ "Uniform Resource Identifier (URI) Schemes")
+
+(defvar thing-at-point-url-regexp
+ (concat "\\<\\(" (mapconcat 'identity thing-at-point-uri-schemes "\\|") "\\)"
+ thing-at-point-url-path-regexp)
+ "A regular expression probably matching a complete URL.")
+
+(defvar thing-at-point-markedup-url-regexp
+ "<URL:[^>]+>"
+ "A regular expression matching a URL marked up per RFC1738.
+This may contain whitespace (including newlines) .")
+
+(put 'url 'bounds-of-thing-at-point 'thing-at-point-bounds-of-url-at-point)
+(defun thing-at-point-bounds-of-url-at-point ()
+ (let ((url "") short strip)
+ (if (or (setq strip (thing-at-point-looking-at
+ thing-at-point-markedup-url-regexp))
+ (thing-at-point-looking-at thing-at-point-url-regexp)
+ ;; Access scheme omitted?
+ (setq short (thing-at-point-looking-at
+ thing-at-point-short-url-regexp)))
+ (let ((beginning (match-beginning 0))
+ (end (match-end 0)))
+ (cond (strip
+ (setq beginning (+ beginning 5))
+ (setq end (- end 1))))
+ (cons beginning end)))))
+
+(put 'url 'thing-at-point 'thing-at-point-url-at-point)
+(defun thing-at-point-url-at-point ()
+ "Return the URL around or before point.
+
+Search backwards for the start of a URL ending at or after point. If
+no URL found, return nil. The access scheme will be prepended if
+absent: \"mailto:\" if the string contains \"@\", \"ftp://\" if it
+starts with \"ftp\" and not \"ftp:/\", or \"http://\" by default."
+
+ (let ((url "") short strip)
+ (if (or (setq strip (thing-at-point-looking-at
+ thing-at-point-markedup-url-regexp))
+ (thing-at-point-looking-at thing-at-point-url-regexp)
+ ;; Access scheme omitted?
+ (setq short (thing-at-point-looking-at
+ thing-at-point-short-url-regexp)))
+ (progn
+ (setq url (buffer-substring-no-properties (match-beginning 0)
+ (match-end 0)))
+ (and strip (setq url (substring url 5 -1))) ; Drop "<URL:" & ">"
+ ;; strip whitespace
+ (while (string-match "[ \t\n\r]+" url)
+ (setq url (replace-match "" t t url)))
+ (and short (setq url (concat (cond ((string-match "@" url)
+ "mailto:")
+ ;; e.g. ftp.swiss... or ftp-swiss...
+ ((string-match "^ftp" url)
+ "ftp://")
+ (t "http://"))
+ url)))
+ (if (string-equal "" url)
+ nil
+ url)))))
+
+;; The normal thingatpt mechanism doesn't work for complex regexps.
+;; This should work for almost any regexp wherever we are in the
+;; match. To do a perfect job for any arbitrary regexp would mean
+;; testing every position before point. Regexp searches won't find
+;; matches that straddle the start position so we search forwards once
+;; and then back repeatedly and then back up a char at a time.
+
+(defun thing-at-point-looking-at (regexp)
+ "Return non-nil if point is in or just after a match for REGEXP.
+Set the match data from the earliest such match ending at or after
+point."
+ (save-excursion
+ (let ((old-point (point)) match)
+ (and (looking-at regexp)
+ (>= (match-end 0) old-point)
+ (setq match (point)))
+ ;; Search back repeatedly from end of next match.
+ ;; This may fail if next match ends before this match does.
+ (re-search-forward regexp nil 'limit)
+ (while (and (re-search-backward regexp nil t)
+ (or (> (match-beginning 0) old-point)
+ (and (looking-at regexp) ; Extend match-end past search start
+ (>= (match-end 0) old-point)
+ (setq match (point))))))
+ (if (not match) nil
+ (goto-char match)
+ ;; Back up a char at a time in case search skipped
+ ;; intermediate match straddling search start pos.
+ (while (and (not (bobp))
+ (progn (backward-char 1) (looking-at regexp))
+ (>= (match-end 0) old-point)
+ (setq match (point))))
+ (goto-char match)
+ (looking-at regexp)))))
+
+(put 'url 'end-op
+ (function (lambda ()
+ (let ((bounds (thing-at-point-bounds-of-url-at-point)))
+ (if bounds
+ (goto-char (cdr bounds))
+ (error "No URL here"))))))