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+;;; url-history.el --- Global history tracking for URL package
+;; Author: $Author: fx $
+;; Created: $Date: 2001/05/05 16:49:52 $
+;; Version: $Revision: 1.6 $
+;; Keywords: comm, data, processes, hypermedia
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Copyright (c) 1993 - 1996 by William M. Perry <wmperry@cs.indiana.edu>
+;;; Copyright (c) 1996 - 1999 Free Software Foundation, Inc.
+;;;
+;;; 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, Inc., 59 Temple Place - Suite 330,
+;;; Boston, MA 02111-1307, USA.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; This can get a recursive require.
+;;(require 'url)
+(eval-when-compile (require 'cl))
+(require 'url-parse)
+(autoload 'url-do-setup "url")
+
+(defgroup url-history nil
+  "History variables in the URL package"
+  :prefix "url-history"
+  :group 'url)
+
+(defcustom url-history-track nil
+  "*Controls whether to keep a list of all the URLS being visited.
+If non-nil, url will keep track of all the URLS visited.
+If eq to `t', then the list is saved to disk at the end of each emacs
+session."
+  :type 'boolean
+  :group 'url-history)
+
+(defcustom url-history-file nil
+  "*The global history file for the URL package.
+This file contains a list of all the URLs you have visited.  This file
+is parsed at startup and used to provide URL completion."
+  :type '(choice (const :tag "Default" :value nil) file)
+  :group 'url-history)
+
+(defcustom url-history-save-interval 3600
+  "*The number of seconds between automatic saves of the history list.
+Default is 1 hour.  Note that if you change this variable outside of
+the `customize' interface after `url-do-setup' has been run, you need
+to run the `url-history-setup-save-timer' function manually."
+  :set (function (lambda (var val)
+		   (set-default var val)
+		   (and (featurep 'url)
+			(fboundp 'url-history-setup-save-timer)
+                        (let ((def (symbol-function
+                                    'url-history-setup-save-timer)))
+                          (not (and (listp def) (eq 'autoload (car def)))))
+			(url-history-setup-save-timer))))
+  :type 'integer
+  :group 'url-history)
+
+(defvar url-history-timer nil)
+
+(defvar url-history-list nil
+  "List of urls visited this session.")
+
+(defvar url-history-changed-since-last-save nil
+  "Whether the history list has changed since the last save operation.")
+
+(defvar url-history-hash-table nil
+  "Hash table for global history completion.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;###autoload
+(defun url-history-setup-save-timer ()
+  "Reset the history list timer."
+  (interactive)
+  (cond
+   ((featurep 'itimer)
+    (ignore-errors (delete-itimer url-history-timer))
+    (setq url-history-timer nil)
+    (if url-history-save-interval
+	(setq url-history-timer
+	      (start-itimer "url-history-saver" 'url-history-save-history
+			    url-history-save-interval
+			    url-history-save-interval))))
+   ((fboundp 'run-at-time)
+    (ignore-errors (cancel-timer url-history-timer))
+    (setq url-history-timer nil)
+    (if url-history-save-interval
+	(setq url-history-timer
+	      (run-at-time url-history-save-interval
+			   url-history-save-interval
+			   'url-history-save-history))))
+   (t nil)))
+
+;;;###autoload
+(defun url-history-parse-history (&optional fname)
+  "Parse a history file stored in FNAME."
+  ;; Parse out the mosaic global history file for completions, etc.
+  (or fname (setq fname (expand-file-name url-history-file)))
+  (cond
+   ((not (file-exists-p fname))
+    (message "%s does not exist." fname))
+   ((not (file-readable-p fname))
+    (message "%s is unreadable." fname))
+   (t
+    (condition-case nil
+	(load fname nil t)
+      (error (message "Could not load %s" fname)))))
+  (if (not url-history-hash-table)
+      (setq url-history-hash-table (make-hash-table :size 31 :test 'equal))))
+
+(defun url-history-update-url (url time)
+  (setq url-history-changed-since-last-save t)
+  (puthash (if (vectorp url) (url-recreate-url url) url) time url-history-hash-table))
+
+;;;###autoload
+(defun url-history-save-history (&optional fname)
+  "Write the global history file into `url-history-file'.
+The type of data written is determined by what is in the file to begin
+with.  If the type of storage cannot be determined, then prompt the
+user for what type to save as."
+  (interactive)
+  (or fname (setq fname (expand-file-name url-history-file)))
+  (cond
+   ((not url-history-changed-since-last-save) nil)
+   ((not (file-writable-p fname))
+    (message "%s is unwritable." fname))
+   (t
+    (let ((make-backup-files nil)
+	  (version-control nil)
+	  (require-final-newline t))
+      (save-excursion
+	(set-buffer (get-buffer-create " *url-tmp*"))
+	(erase-buffer)
+	(let ((count 0))
+	  (maphash (function
+		       (lambda (key value)
+			 (while (string-match "[\r\n]+" key)
+			   (setq key (concat (substring key 0 (match-beginning 0))
+					     (substring key (match-end 0) nil))))
+			 (setq count (1+ count))
+			 (insert "(puthash \"" key "\""
+				 (if (not (stringp value)) " '" "")
+				 (prin1-to-string value)
+				 " url-history-hash-table)\n")))
+		      url-history-hash-table)
+	  (goto-char (point-min))
+	  (insert (format
+		   "(setq url-history-hash-table (make-hash-table :size %d :test 'equal))\n"
+		   (/ count 4)))
+	  (goto-char (point-max))
+	  (insert "\n")
+	  (write-file fname))
+	(kill-buffer (current-buffer))))))
+  (setq url-history-changed-since-last-save nil))
+
+(defun url-have-visited-url (url)
+  (url-do-setup)
+  (gethash url url-history-hash-table nil))
+
+(defun url-completion-function (string predicate function)
+  (url-do-setup)
+  (cond
+   ((eq function nil)
+    (let ((list nil))
+      (maphash (function (lambda (key val)
+			      (setq list (cons (cons key val)
+					       list))))
+		  url-history-hash-table)
+      (try-completion string (nreverse list) predicate)))
+   ((eq function t)
+    (let ((stub (concat "^" (regexp-quote string)))
+	  (retval nil))
+      (maphash
+       (function
+	(lambda (url time)
+	  (if (string-match stub url)
+	      (setq retval (cons url retval)))))
+       url-history-hash-table)
+      retval))
+   ((eq function 'lambda)
+    (and url-history-hash-table
+	 (gethash string url-history-hash-table)
+	 t))
+   (t
+    (error "url-completion-function very confused."))))
+
+(provide 'url-history)