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-;;; guix-history.el --- History of buffer information
-
-;; Copyright © 2014 Alex Kost <alezost@gmail.com>
-
-;; This file is part of GNU Guix.
-
-;; GNU Guix 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 Guix 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 this program. If not, see <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-
-;; This file provides support for history of buffers similar to the
-;; history of a `help-mode' buffer.
-
-;;; Code:
-
-(require 'cl-macs)
-
-(defvar-local guix-history-stack-item nil
- "Current item of the history.
-A list of the form (FUNCTION [ARGS ...]).
-The item is used by calling (apply FUNCTION ARGS).")
-(put 'guix-history-stack-item 'permanent-local t)
-
-(defvar-local guix-history-back-stack nil
- "Stack (list) of visited items.
-Each element of the list has a form of `guix-history-stack-item'.")
-(put 'guix-history-back-stack 'permanent-local t)
-
-(defvar-local guix-history-forward-stack nil
- "Stack (list) of items visited with `guix-history-back'.
-Each element of the list has a form of `guix-history-stack-item'.")
-(put 'guix-history-forward-stack 'permanent-local t)
-
-(defvar guix-history-size 0
- "Maximum number of items saved in history.
-If 0, the history is disabled.")
-
-(defun guix-history-add (item)
- "Add ITEM to history."
- (and guix-history-stack-item
- (push guix-history-stack-item guix-history-back-stack))
- (setq guix-history-forward-stack nil
- guix-history-stack-item item)
- (when (>= (length guix-history-back-stack)
- guix-history-size)
- (setq guix-history-back-stack
- (cl-loop for elt in guix-history-back-stack
- for i from 1 to guix-history-size
- collect elt))))
-
-(defun guix-history-replace (item)
- "Replace current item in history with ITEM."
- (setq guix-history-stack-item item))
-
-(defun guix-history-goto (item)
- "Go to the ITEM of history.
-ITEM should have the form of `guix-history-stack-item'."
- (or (listp item)
- (error "Wrong value of history element"))
- (setq guix-history-stack-item item)
- (apply (car item) (cdr item)))
-
-(defun guix-history-back ()
- "Go back to the previous element of history in the current buffer."
- (interactive)
- (or guix-history-back-stack
- (user-error "No previous element in history"))
- (push guix-history-stack-item guix-history-forward-stack)
- (guix-history-goto (pop guix-history-back-stack)))
-
-(defun guix-history-forward ()
- "Go forward to the next element of history in the current buffer."
- (interactive)
- (or guix-history-forward-stack
- (user-error "No next element in history"))
- (push guix-history-stack-item guix-history-back-stack)
- (guix-history-goto (pop guix-history-forward-stack)))
-
-(provide 'guix-history)
-
-;;; guix-history.el ends here