Visual navigation through mark rings in Emacs.
Two-way movement within the ring is supported.
(require 'back-button) (back-button-mode 1) ;; press the plus sign in the toolbar to create a mark ;; press the arrows in the toolbar to navigate marks ;; or use C-x C-Space as usual, then try C-x C-<right> ;; to reverse the operation
Back-button provides an alternative method for navigation by analogy with the "back" button in a web browser.
Every Emacs command which pushes the mark leaves behind an invisible record of the location of the point at that moment. Back-button moves the point back and forth over all the positions where some command pushed the mark.
This is essentially a replacement for pop-global-mark, and the default keybindings (when the minor mode is activated) override that command. The differences with pop-global-mark are:
Visual index showing how far you have traveled in the mark ring.
Easy way to move both forward and backward in the ring.
Pushes a mark on the first of a series of invocations, so you can always return to where you issued the command.
Skips duplicate positions, so that the interactive command always moves the point if possible.
Commands and keybindings are also included to give identical semantics for navigating the local (per-buffer) mark-ring. This consistency in navigation comes at the cost of pushing the mark twice, so experienced Emacs users may prefer to unbind these commands and/or set back-button-never-push-mark in customize.
When the visible-mark package is installed, marks will be made visible in the current buffer during navigation.
Keystrokes Action C-x C-<SPC> go back in
global-mark-ring, respects prefix arg C-x C-<left> go back in global-mark-ring C-x C-<right> go forward in global-mark-ring C-x <SPC> go back in (buffer-local) mark-ring, respects prefix arg C-x <left> go back in (buffer-local) mark-ring C-x <right> go forward in (buffer-local) mark-ring
When the smartrep package is installed, the C-x prefix need not be used for consecutive back-button commands.
This library depends upon other commands pushing the mark to provide useful waypoints for navigation. This is a common convention, but not universal.
The function back-button-push-mark-local-and-global may be useful to call from Lisp. It is a replacement for push-mark which unconditionally pushes onto the global mark ring, functionality which is not possible using vanilla push-mark.
Theoretically, back-button-push-mark-local-and-global could cause issues with Lisp code which depends on the convention that global-mark-ring not contain consecutive marks in the same buffer. However, no such issues have been observed.
GNU Emacs version 24.4-devel : yes, at the time of writing
GNU Emacs version 24.3 : yes
GNU Emacs version 23.3 : yes
GNU Emacs version 22.2 : yes, with some limitations
GNU Emacs version 21.x and lower : unknown
For GNU Emacs versions lower than 24.3, the cl-lib package is required.
Uses if present: nav-flash.el, smartrep.el, unicode-fonts.el, visible-mark.el
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