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191 lines
6.8 KiB
EmacsLisp
191 lines
6.8 KiB
EmacsLisp
;;; url-history.el --- Global history tracking for URL package
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;; Copyright (C) 1996, 1997, 1998, 1999, 2004,
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;; 2005, 2006, 2007 Free Software Foundation, Inc.
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;; Keywords: comm, data, processes, hypermedia
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;; This file is part of GNU Emacs.
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;;
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;;
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;;; Code:
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;; This can get a recursive require.
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;;(require 'url)
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(eval-when-compile (require 'cl))
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(require 'url-parse)
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(autoload 'url-do-setup "url")
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(defgroup url-history nil
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"History variables in the URL package."
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:prefix "url-history"
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:group 'url)
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(defcustom url-history-track nil
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"*Controls whether to keep a list of all the URLs being visited.
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If non-nil, the URL package will keep track of all the URLs visited.
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If set to t, then the list is saved to disk at the end of each Emacs
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session."
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:set #'(lambda (var val)
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(set-default var val)
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(and (bound-and-true-p url-setup-done)
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(url-history-setup-save-timer)))
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:type '(choice (const :tag "off" nil)
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(const :tag "on" t)
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(const :tag "within session" 'session))
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:group 'url-history)
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(defcustom url-history-file nil
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"*The global history file for the URL package.
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This file contains a list of all the URLs you have visited. This file
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is parsed at startup and used to provide URL completion."
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:type '(choice (const :tag "Default" :value nil) file)
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:group 'url-history)
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(defcustom url-history-save-interval 3600
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"*The number of seconds between automatic saves of the history list.
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Default is 1 hour. Note that if you change this variable outside of
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the `customize' interface after `url-do-setup' has been run, you need
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to run the `url-history-setup-save-timer' function manually."
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:set #'(lambda (var val)
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(set-default var val)
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(if (bound-and-true-p url-setup-done)
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(url-history-setup-save-timer)))
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:type 'integer
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:group 'url-history)
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(defvar url-history-timer nil)
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(defvar url-history-changed-since-last-save nil
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"Whether the history list has changed since the last save operation.")
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(defvar url-history-hash-table (make-hash-table :size 31 :test 'equal)
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"Hash table for global history completion.")
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defun url-history-setup-save-timer ()
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"Reset the history list timer."
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(interactive)
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(ignore-errors
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(cancel-timer url-history-timer))
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(setq url-history-timer nil)
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(if (and (eq url-history-track t) url-history-save-interval)
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(setq url-history-timer (run-at-time url-history-save-interval
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url-history-save-interval
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'url-history-save-history))))
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(defun url-history-parse-history (&optional fname)
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"Parse a history file stored in FNAME."
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;; Parse out the mosaic global history file for completions, etc.
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(or fname (setq fname (expand-file-name url-history-file)))
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(cond
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((not (file-exists-p fname))
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;; It's completely normal for this file not to exist, so don't complain.
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;; (message "%s does not exist." fname)
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)
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((not (file-readable-p fname))
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(message "%s is unreadable." fname))
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(t
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(condition-case nil
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(load fname nil t)
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(error (message "Could not load %s" fname))))))
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(defun url-history-update-url (url time)
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(setq url-history-changed-since-last-save t)
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(puthash (if (vectorp url) (url-recreate-url url) url) time
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url-history-hash-table))
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(defun url-history-save-history (&optional fname)
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"Write the global history file into `url-history-file'.
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The type of data written is determined by what is in the file to begin
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with. If the type of storage cannot be determined, then prompt the
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user for what type to save as."
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(interactive)
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(or fname (setq fname (expand-file-name url-history-file)))
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(unless (file-directory-p (file-name-directory fname))
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(ignore-errors (make-directory (file-name-directory fname))))
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(cond
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((not url-history-changed-since-last-save) nil)
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((not (file-writable-p fname))
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(message "%s is unwritable." fname))
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(t
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(let ((make-backup-files nil)
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(version-control nil)
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(require-final-newline t))
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(with-current-buffer (get-buffer-create " *url-tmp*")
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(erase-buffer)
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(let ((count 0))
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(maphash (lambda (key value)
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(while (string-match "[\r\n]+" key)
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(setq key (concat (substring key 0 (match-beginning 0))
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(substring key (match-end 0) nil))))
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(setq count (1+ count))
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(insert "(puthash \"" key "\""
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(if (not (stringp value)) " '" "")
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(prin1-to-string value)
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" url-history-hash-table)\n"))
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url-history-hash-table)
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;; We used to add this in the file, but it just makes the code
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;; more complex with no benefit. Worse: it makes it harder to
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;; preserve preexisting history when loading the history file.
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;; (goto-char (point-min))
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;; (insert (format
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;; "(setq url-history-hash-table (make-hash-table :size %d :test 'equal))\n"
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;; (/ count 4)))
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;; (goto-char (point-max))
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(insert "\n")
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(write-file fname))
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(kill-buffer (current-buffer))))))
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(setq url-history-changed-since-last-save nil))
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(defun url-have-visited-url (url)
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(url-do-setup)
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(gethash url url-history-hash-table nil))
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(defun url-completion-function (string predicate function)
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;; Completion function to complete urls from the history.
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;; This is obsolete since we can now pass the hash-table directly as a
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;; completion table.
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(url-do-setup)
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(cond
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((eq function nil)
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(let ((list nil))
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(maphash (lambda (key val) (push key list))
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url-history-hash-table)
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;; Not sure why we bother reversing the list. --Stef
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(try-completion string (nreverse list) predicate)))
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((eq function t)
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(let ((stub (concat "\\`" (regexp-quote string)))
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(retval nil))
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(maphash
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(lambda (url time)
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(if (string-match stub url) (push url retval)))
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url-history-hash-table)
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retval))
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((eq function 'lambda)
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(and (gethash string url-history-hash-table) t))
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(t
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(error "url-completion-function very confused"))))
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(provide 'url-history)
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;; arch-tag: fbbbaf63-db36-4e88-bc9f-2939aa93afb2
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;;; url-history.el ends here
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