+(defvar elopher-url-regex "\\(https?\\|gopher\\)://\\([a-zA-Z0-9.\-]+\\)\\(?3::[0-9]+\\)?\\(?4:/[^ \r\n\t(),]*\\)")
+
+(defun elopher-buttonify-urls (string)
+ "Turn substrings which look like urls in STRING into clickable buttons."
+ (with-temp-buffer
+ (insert string)
+ (goto-char (point-min))
+ (while (re-search-forward elopher-url-regex nil t)
+ (let ((url (match-string 0))
+ (protocol (downcase (match-string 1))))
+ (if (string= protocol "gopher")
+ (let* ((host (match-string 2))
+ (port 70)
+ (type-and-selector (match-string 4))
+ (type (if (> (length type-and-selector) 1)
+ (elt type-and-selector 1)
+ ?1))
+ (selector (if (> (length type-and-selector) 1)
+ (substring type-and-selector 2)
+ ""))
+ (address (elopher-make-address selector host port))
+ (getter (car (alist-get type elopher-type-map))))
+ (make-text-button (match-beginning 0)
+ (match-end 0)
+ 'elopher-node (elopher-make-node elopher-current-node
+ address
+ getter)
+ 'action #'elopher-click-link
+ 'follow-link t
+ 'help-echo (format "mouse-1, RET: open %s on %s port %s"
+ selector host port)))
+ (make-text-button (match-beginning 0)
+ (match-end 0)
+ 'elopher-url url
+ 'action #'elopher-click-url
+ 'follow-link t
+ 'help-echo (format "mouse-1, RET: open url %s" url)))))
+ (buffer-string)))
+
+(defun elopher-process-text (string)
+ (let* ((chopped-str (replace-regexp-in-string "\r\n\.\r\n$" "\r\n" string))
+ (cleaned-str (replace-regexp-in-string "\r" "" chopped-str)))
+ (elopher-buttonify-urls cleaned-str)))