gundo.vim
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undo-tree
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Text Editor Data Structures: Rethinking Undo
vundo is a simpler implementation: it reuses Emacs's tree and just implements the visualisation part.
undo-tree is a reimplementation of Emacs's tree based undo, that supports a visualization.
* undo-tree LOC: 4700. https://gitlab.com/tsc25/undo-tree/-/blob/master/undo-tree.e...
* vundo LOC: 1350. https://github.com/casouri/vundo/blob/master/vundo.el
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How to undo the undo
That said, the situations seems murky still: the version in ELPA is newer (0.7.5), but it's still outdated, the home page advertises 0.8.2 as the latest version. And it moved to a different repository location. And looking at its history, it seems to never have included the version 0.7.5: https://gitlab.com/tsc25/undo-tree/-/commit/5da2a7aee98393d26a93c499dc79fcf793f161e1
- Undo-Tree.el
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Why is it so hard to see code from 5 minutes ago?
It’s easier to mentally map that the default behaviour undo/redo for Emacs (which is not unreasonable, just complex).
The source for undo-tree contains documentation which very effectively describes the way the library works with examples and comparisons with how Emacs does things by default: https://gitlab.com/tsc25/undo-tree/-/blob/master/undo-tree.e...
- undo-tree repository's new home (Gitlab)
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undo-tree git repository is not available anymore?
Looks like the repo is moved to https://gitlab.com/tsc25/undo-tree
gundo.vim
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Piece of mind for a reddit noob.
Using a plugin like undotree (or Gundo, or Mundo) to visualize the edit history is by far the most practical solution to OP's problem, and I'm shocked you're the only person to suggest it.
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Why is it so hard to see code from 5 minutes ago?
For those that use vim, gundo.vim visualizes the "undo-tree" and allows you to preview / jump to any revision: https://github.com/sjl/gundo.vim
What are some alternatives?
emacs-undo-fu
undotree - The undo history visualizer for VIM
vim-mundo - :christmas_tree: Vim undo tree visualizer
xray - An experimental next-generation Electron-based text editor
emacs-undo-fu-session
klonk - A text editor with an sort-of-unusual undo/redo algorithm
WBO - Online collaborative Whiteboard that is simple, free, easy to use and to deploy
StyleCopAnalyzers - An implementation of StyleCop rules using the .NET Compiler Platform
local-history - local-history for vscode