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Emacs has a powerful undo system. Unlike the standard undo/redo system in most software, it allows you to recover any past state of a buffer (whereas the standard undo/redo system can lose past states as soon as you redo). However, this power comes at a price: many people find Emacs' undo system confusing and difficult to use, spawning a number of packages that replace it with the less powerful but more intuitive undo/redo system. Both the loss of data with standard undo/redo, and the confusion of Emacs' undo, stem from trying to treat undo history as a linear sequence of changes. It's not. The undo-tree-mode provided by this package replaces Emacs' undo system with a system that treats undo history as what it is: a branching tree of changes. This simple idea allows the more intuitive behaviour of the standard undo/redo system to be combined with the power of never losing any history. It gets better. You don't have to imagine the undo tree, because undo-tree-mode includes an undo-tree visualizer which draws it for you, and lets you browse around the undo history. For more information, see the Commentary at the top of the undo-tree.el file. (Note that undo-tree-mode does not yet support undo-in-region, nor, for low-level reasons, does it restore marker adjustments. I plan to support both of these in a future version.)
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@comment $NetBSD: PLIST,v 1.1.1.1 2010/02/22 03:52:50 phonohawk Exp $
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${EMACS_LISPPREFIX}/undo-tree.el
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${EMACS_LISPPREFIX}/undo-tree.elc
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