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docs: explain how not exposing "the index" in the UI is a good thing

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Martin von Zweigbergk 2021-12-18 08:07:17 -08:00
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README.md
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@ -14,7 +14,8 @@ from Google.
Jujutsu is a Git-compatible
[DVCS](https://en.wikipedia.org/wiki/Distributed_version_control). It combines
features from Git (data model, speed), Mercurial (anonymous branching, simple
CLI free from "the index", [revsets](docs/revsets.md)), and Pijul/Darcs
CLI [free from "the index"](docs/git-comparison.md#the-index),
[revsets](docs/revsets.md)), and Pijul/Darcs
([first-class conflicts](docs/conflicts.md)), with features not found in either
of them ([working-copy-as-a-commit](docs/working-copy.md),
[undo functionality](docs/operation-log.md), automatic rebase).

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docs/git-comparison.md
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@ -2,6 +2,27 @@
TODO: Describe the differences compared to Git here
## The index
Git's ["index"](https://git-scm.com/book/en/v2/Git-Tools-Reset-Demystified) has
multiple roles. One role is as a cache of file system information. Jujutsu has
something similar. Unfortunately, Git exposes the index to the user, which makes
the CLI unnecessarily complicated (learning what the different flavors of
`git reset` do, especially when combined with commits and/or paths, usually
takes a while). Jujutsu, like Mercurial, doesn't make that mistake.
As a Git power-user, you may think that you need the power of the index to
commit only part of the working copy. However, Jujutsu provides commands for
more directly achieving most use cases you're used to using Git's index for. For
example, to create a commit from part of the changes in the working copy, you
might be used to using `git add -p; git commit`. With Jujutsu, you'd instead
use `jj split` to split the working copy commit into two commits. To add more
changes into the parent commit, which you might normally use
`git add -p; git commit --amend` for, you can instead use `jj squash -i` to
choose which changes to move into the parent commit.
## Command equivalence table
Note that all `jj` commands can be run on any commit (not just the working copy