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