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docs: add a table of git/jj command equivalences

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Martin von Zweigbergk 2021-08-29 23:25:53 -07:00
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# Comparison with Git
TODO: Describe the differences compared to Git here
## Command equivalence table
Note that all `jj` commands can be run on any commit (not just the working copy
commit), but that's left out of the table to keep it simple. For example,
`jj squash -r <revision>` will move the diff from that revision into its parent.
<table>
<thead>
<tr>
<th>Use case</th>
<th>Jujutsu command</th>
<th>Git command</th>
</tr>
</thead>
<tbody>
<tr>
<td>Create a new repo</td>
<td><code>jj init --git</code> (without <code>--git</code>, you get a
native Jujutsu repo, which is slow and whose format will change)</td>
<td><code>git init</code></td>
</tr>
<tr>
<td>Clone an existing repo</td>
<td><code>jj git clone &lt;source&gt; &lt;destination&gt;</code> (there is no support
for cloning non-Git repos yet)</td>
<td><code>git clone &lt;source&gt; &lt;destination&gt;</code></td>
</tr>
<tr>
<td>Show summary of current work and repo status</td>
<td><code>jj st</code></td>
<td><code>git st</code></td>
</tr>
<tr>
<td>Show diff of the current change</td>
<td><code>jj diff</code></td>
<td><code>git diff HEAD</code></td>
</tr>
<tr>
<td>Show diff of another change</td>
<td><code>jj diff -r &lt;revision&gt;</code></td>
<td><code>git diff &lt;revision&gt;^ &lt;revision&gt;</code></td>
</tr>
<tr>
<td>Add a file to the current change</td>
<td><code>touch filename</code></td>
<td><code>touch filename; git add filename</code></td>
</tr>
<tr>
<td>Remove a file from the current change</td>
<td><code>rm filename</code></td>
<td><code>git rm filename</code></td>
</tr>
<tr>
<td>Modify a file in the current change</td>
<td><code>echo stuff >> filename</code></td>
<td><code>echo stuff >> filename; git add filename</code></td>
</tr>
<tr>
<td>Finish work on the current change and start a new change</td>
<td><code>jj close</code></td>
<td><code>git commit -a</code></td>
</tr>
<tr>
<td>See log of commits</td>
<td><code>jj log</code></td>
<td><code>git log --oneline --graph --decorate</code></td>
</tr>
<tr>
<td>Abandon the current change and start a new change</td>
<td><code>jj prune</code></td>
<td><code>git reset --hard</code> (cannot be undone)</td>
</tr>
<tr>
<td>Make the current change empty</td>
<td><code>jj restore</code></td>
<td><code>git reset --hard</code> (same as abandoning a change since Git
has no concept of a "change")</td>
</tr>
<tr>
<td>Edit description (commit message) of the current change</td>
<td><code>jj describe</code></td>
<td>Not supported</td>
</tr>
<tr>
<td>Edit description (commit message) of the previous change</td>
<td><code>jj describe :@</code></td>
<td><code>git commit --amend</code> (first make sure that nothing is
staged)</td>
</tr>
<tr>
<td>Temporarily put away the current change</td>
<td>Not needed</td>
<td><code>git stash</code></td>
</tr>
<tr>
<td>Start working on a new change based on the &lt;main&gt; branch</td>
<td><code>jj co main</code></td>
<td><code>git checkout -b topic main</code> (may need to stash or commit
first)</td>
</tr>
<tr>
<td>Move branch A onto branch B</td>
<td>Not supported yet (can be emulated with
<code>jj rebase -s</code>)</td>
<td><code>git rebase B A</code>
(may need to rebase other descendant branches separately)</td>
</tr>
<tr>
<td>Move change A and its descendants onto change B</td>
<td><code>jj rebase -s A -d B</code></td>
<td><code>git rebase --onto B A^ &lt;some descendant branch&gt;</code>
(may need to rebase other descendant branches separately)</td>
</tr>
<tr>
<td>Reorder changes from A-B-C-D to A-C-B-D</td>
<td><code>jj rebase -r C -d A; rebase -s B -d C</code> (pass change ids,
not commit ids, to not have to look up commit id of rewritten C)</td>
<td><code>git rebase -i A</code></td>
</tr>
<tr>
<td>Move the diff in the current change into the parent change</td>
<td><code>jj squash</code></td>
<td><code>git commit --amend -a</code></td>
</tr>
<tr>
<td>Interactively move part of the diff in the current change into the
parent change</td>
<td><code>jj squash -i</code></td>
<td><code>git add -p; git commit --amend</code></td>
</tr>
<tr>
<td>Interactively split a change in two</td>
<td><code>jj split -r &lt;revision&gt;</code></td>
<td>Not supported (can be emulated with the "edit" action in
<code>git rebase -i</code>)</td>
</tr>
<tr>
<td>Interactively edit the diff in a given change</td>
<td><code>jj edit -r &lt;revision&gt;</code></td>
<td>Not supported (can be emulated with the "edit" action in
<code>git rebase -i</code>)</td>
</tr>
<tr>
<td>Resolve conflicts and continue interrupted operation</td>
<td><code>echo resolved > filename; jj squash</code> (operations don't
get interrupted, so no need to continue)</td>
<td><code>echo resolved > filename; git add filename; git
rebase/merge/cherry-pick --continue</code></td>
</tr>
<tr>
<td>See log of operations performed on the repo</td>
<td><code>jj op log</code></td>
<td>Not supported</td>
</tr>
<tr>
<td>Undo an earlier operation</td>
<td><code>jj op undo -o &lt;operation id&gt;</code></td>
<td>Not supported</td>
</tr>
</tbody>
</table>

8
src/commands.rs
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@ -1213,6 +1213,14 @@ See `jj concepts branches` for information about branches.",
);
let git_command = SubCommand::with_name("git")
.about("Commands for working with the underlying Git repo")
.long_about(
"Commands for working with the underlying Git repo.
For a comparison with Git, including \
a table of commands, see
https://github.com/martinvonz/jj/blob/main/docs/git-comparison.md.\
",
)
.setting(clap::AppSettings::SubcommandRequiredElseHelp)
.subcommand(
SubCommand::with_name("fetch")