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tutorial: update with recent changes, plus some other editing

Browse source 
We have made some changes to CLI output that had not made it into the
tutorial. It's time to update it, especially with the new change id
rendering. Since I'm updating it now, and since it's a bit of work to
do so, I decided to use GitHub's Hello-World repo instead of jj's own
repo as our example.
This commit is contained in:
Martin von Zweigbergk 2023-02-12 14:37:50 -08:00 committed by Martin von Zweigbergk
parent 81af5f820b
commit 78d77661bc
1 changed files with 175 additions and 161 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

336
docs/tutorial.md
View file

@ -9,66 +9,51 @@ If you haven't already, make sure you
## Cloning a Git repo
Let's start by cloning the Jujutsu Git repo using `jj`:
Let's start by cloning GitHub's Hello-World repo using `jj`:
```shell script
# Note the "git" before "clone" (there is no support for cloning native jj
# repos yet)
$ jj git clone https://github.com/martinvonz/jj.git
Fetching into new repo in "<dir>/jj"
Working copy now at: 265ecf5cab2d (no description set)
Added 98 files, modified 0 files, removed 0 files
$ cd jj
$ jj git clone https://github.com/octocat/Hello-World
Fetching into new repo in "/tmp/tmp.O1DWMiaKd4/Hello-World"
Working copy now at: d7439b06fbef (no description set)
Added 1 files, modified 0 files, removed 0 files
$ cd Hello-World
```
Running `jj st` (short for`jj status`) now yields something like this:
```shell script
$ jj st
Parent commit: 723ebb380971 cleanup: restructure escaped newlines to make new rustc happy
Working copy : 265ecf5cab2d (no description set)
Parent commit: 7fd1a60b01f9 Merge pull request #6 from Spaceghost/patch-1
Working copy : d7439b06fbef (no description set)
The working copy is clean
```
We can see from the output above that our working copy has a commit ID
(`265ecf5cab2d` in the example).
Let's check out a particular commit, so we get more predictable output:
```shell script
$ jj co 080a9b37ff7e
Working copy now at: 608c179a60df
Added 7 files, modified 65 files, removed 21 files
$ jj st
Parent commit: 080a9b37ff7e cli: make `jj st` show parent commit before working copy commit
Working copy : 608c179a60df (no description set)
The working copy is clean
```
You might have noticed that even though we asked to check out some commit
(`080a9b37ff7e`), our working-copy commit ended up being another commit
(`608c179a60df`). That is because `jj co` (short for `jj checkout`) creates a
new commit on top of the commit you asked it to check out. The new commit is for
the working-copy changes.
We can see from the output above that our working copy is a real commit with a
commit ID (`7fd1a60b01f9` in the example). When you make a change in the working
copy, the working-copy commit gets automatically amended by the next `jj`
command.
## Creating our first change
Now let's say we want to edit the `README.md` file in the repo to say that Jujutsu
is ready for use. Let's start by describing the change (adding a commit message)
so we don't forget what we're working on:
Now let's say we want to edit the `README` file in the repo to say "Goodbye"
instead of "Hello". Let's start by describing the change (adding a
commit message) so we don't forget what we're working on:
```shell script
# This will bring up $EDITOR (or `pico` by default). Enter something like
# "Jujutsu is ready!" in the editor and then close it.
# "Say goodbye" in the editor and then close it.
$ jj describe
Working copy now at: b2985d68096d Jujutsu is ready!
Working copy now at: e427edcfd0ba Say goodbye
```
Now make the change in the README:
```shell script
# Adjust as necessary for compatibility with your flavor of `sed`
$ sed -i 's/not ready/ready/' README.md
$ sed -i 's/Hello/Goodbye/' README
$ jj st
Parent commit: 080a9b37ff7e cli: make `jj st` show parent commit before working copy commit
Working copy : 5f80190c44b9 Jujutsu is ready!
Parent commit: 7fd1a60b01f9 Merge pull request #6 from Spaceghost/patch-1
Working copy : 5d39e19dac36 Say goodbye
Working copy changes:
M README.md
M README
```
Note that you didn't have to tell Jujutsu to add the change like you would with
`git add`. You actually don't even need to tell it when you add new files or
@ -78,22 +63,16 @@ remove existing files. To untrack a path, add it to your `.gitignore` and run
To see the diff, run `jj diff`:
```shell script
$ jj diff --git # Feel free to skip the `--git` flag
diff --git a/README.md b/README.md
index aa9b9e31a8...c30897997c 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
## Disclaimer
This is not a Google product. It is an experimental version-control system
-(VCS). It is not ready for use. It was written by me, Martin von Zweigbergk
+(VCS). It is ready for use. It was written by me, Martin von Zweigbergk
(martinvonz@google.com). It is my personal hobby project. It does not indicate
any commitment or direction from Google.
diff --git a/README b/README
index 980a0d5f19...1ce3f81130 100644
--- a/README
+++ b/README
@@ -1,1 +1,1 @@
-Hello World!
+Goodbye World!
```
Jujutsu's diff format currently defaults to inline coloring of the diff (like
`git diff --color-words`), so we used `--git` above to make the diff visible in
`git diff --color-words`), so we used `--git` above to make the diff readable in
this tutorial.
As you may have noticed, the working-copy commit's ID changed both when we
@ -102,29 +81,33 @@ stayed the same. Each change to the working-copy commit amends the previous
version. So how do we tell Jujutsu that we are done amending the current change
and want to start working on a new one? That is what `jj new` is for. That will
create a new commit on top of your current working-copy commit. The new commit
is for the working-copy changes. That may remind you of what we said earlier
that `jj checkout` does; `jj checkout` is in fact practically a synonym for
`jj new` (you can specify a destination for `jj new` as well).
is for the working-copy changes. For familiarity for user coming from other
VCSs, there is also a `jj checkout/co` command, which is practically a synonym
for `jj new` (you can specify a destination for `jj new` as well).
So, let's say we're now done with this change, so we create a new change:
```shell script
$ jj new
Working copy now at: 192b456b024b (no description set)
Working copy now at: aef4df99ea11 (no description set)
$ jj st
Parent commit: fb563a4c6d26 Jujutsu is ready!
Working copy : 192b456b024b (no description set)
Parent commit: 5d39e19dac36 Say goodbye
Working copy : aef4df99ea11 (no description set)
The working copy is clean
```
If we later realize that we want to make further changes, we can make them
in the working copy and then run `jj squash`. That command squashes the changes
from a given commit into its parent commit. Like most commands, it acts on the
working-copy commit by default. Alternatively, we can use `jj edit <commit>` to
resume editing a commit in the working copy. Any further changes in the working
copy will then amend the commit. Whether you choose to checkout-and-squash or to
edit typically depends on how done you are with the change; if the change is
almost done, it makes sense to use `jj checkout` so you can easily review your
adjustments with `jj diff` before running `jj squash`.
working-copy commit by default. When run on the working-copy commit, it behaves
very similar to `git commit --amend`, and `jj amend` is in fact an alias for
`jj squash`.
Alternatively, we can use `jj edit <commit>` to resume editing a commit in the
working copy. Any further changes in the working copy will then amend the
commit. Whether you choose to checkout-and-squash or to edit typically depends
on how done you are with the change; if the change is almost done, it makes
sense to use `jj checkout` so you can easily review your adjustments with
`jj diff` before running `jj squash`.
## The log command and "revsets"
@ -132,20 +115,21 @@ You're probably familiar with `git log`. Jujutsu has very similar functionality
in its `jj log` command:
```shell script
$ jj log
@ f39aeb1a0200 martinvonz@google.com 2021-05-23 23:10:27.000 -07:00 192b456b024b
| (empty) (no description set)
o f63e76f175b9 martinvonz@google.com 2021-05-23 22:13:45.000 -07:00 fb563a4c6d26
| Jujutsu is ready!
o 6a91b4ba16c7 martinvonz@google.com 2021-05-23 22:08:37.000 -07:00 main 080a9b37ff7e
~ cli: make `jj st` show parent commit before working copy commit
@ mpqrykypylvy martinvonz@google.com 2023-02-12 15:00:22.000 -08:00 aef4df99ea11
│ (empty) (no description set)
o kntqzsqtnspv martinvonz@google.com 2023-02-12 14:56:59.000 -08:00 5d39e19dac36
│ Say goodbye
o orrkosyozysx octocat@nowhere.com 2012-03-06 15:06:50.000 -08:00 master 7fd1a60b01f9
│ (empty) Merge pull request #6 from Spaceghost/patch-1
~
```
The `@` indicates the working-copy commit. The first hash on a line is the
"change ID", which is an ID that follows the commit as it's rewritten (similar
to Gerrit's Change-Id). The second hash is the commit ID, which changes when you
rewrite the commit. You can give either hash to commands that take revisions as
arguments. We will generally prefer change IDs because they stay the same when
the commit is rewritten.
The `@` indicates the working-copy commit. The first ID on a line
(e.g. "mpqrykypylvy" above) is the "change ID", which is an ID that follows the
commit as it's rewritten (similar to Gerrit's Change-Id). The second ID is the
commit ID, which changes when you rewrite the commit. You can give either ID
to commands that take revisions as arguments. We will generally prefer change
IDs because they stay the same when the commit is rewritten.
By default, `jj log` lists your local commits, with some remote commits added
for context. The `~` indicates that the commit has parents that are not
@ -158,16 +142,21 @@ expressions with `|` for union, `&` for intersection and `~` for difference. For
example:
```shell script
$ jj log -r '@ | root | branches()'
@ f39aeb1a0200 martinvonz@google.com 2021-05-23 23:10:27.000 -07:00 192b456b024b
: (empty) (no description set)
o 6a91b4ba16c7 martinvonz@google.com 2021-05-23 22:08:37.000 -07:00 main 080a9b37ff7e
: cli: make `jj st` show parent commit before working copy commit
o 000000000000 1970-01-01 00:00:00.000 +00:00 000000000000
(empty) (no description set)
@ mpqrykypylvy martinvonz@google.com 2023-02-12 15:00:22.000 -08:00 aef4df99ea11
╷ (empty) (no description set)
╷ o kowxouwzwxmv octocat@nowhere.com 2014-06-10 15:22:26.000 -07:00 test b3cbd5bbd7e8
╭─╯ Create CONTRIBUTING.md
│ o tpstlustrvsn support+octocat@github.com 2018-05-10 12:55:19.000 -05:00 octocat-patch-1 b1b3f9723831
├─╯ sentence case
o orrkosyozysx octocat@nowhere.com 2012-03-06 15:06:50.000 -08:00 master 7fd1a60b01f9
╷ (empty) Merge pull request #6 from Spaceghost/patch-1
o zzzzzzzzzzzz 1970-01-01 00:00:00.000 +00:00 000000000000
(empty) (no description set)
```
The `000000000000` commit is a virtual commit that's called the "root commit".
It's the root commit of every repo. The `root` symbol in the revset matches it.
The `000000000000` commit (change ID `zzzzzzzzzzzz`) is a virtual commit that's
called the "root commit". It's the root commit of every repo. The `root` symbol
in the revset matches it.
There are also operators for getting the parents (`foo-`), children (`foo+`),
ancestors (`:foo`), descendants (`foo:`), DAG range (`foo:bar`, like
@ -180,43 +169,53 @@ input set if they're ancestors of other revisions in the set.
Now let's see how Jujutsu deals with merge conflicts. We'll start by making some
commits:
```shell script
# Start creating a chain of commits off of the grandparent of the working copy
$ jj new @-- -m A; echo a > file1
Working copy now at: 9164f1d6a011 A
# Start creating a chain of commits off of the `master` branch
$ jj new master -m A; echo a > file1
Working copy now at: 00a2aeed556a A
Added 0 files, modified 1 files, removed 0 files
$ jj new -m B1; echo b1 > file1
Working copy now at: 5be91b2b5b69 B1
Working copy now at: 967d9f9fd288 B1
$ jj new -m B2; echo b2 > file1
Working copy now at: fd571967346e B2
Working copy now at: 8ebeaffa332b B2
$ jj new -m C; echo c > file2
Working copy now at: 4ae1e0587eef C
Working copy now at: 62a3c6d315cd C
$ jj log
@ 8e6178b84ffb martinvonz@google.com 2021-05-26 12:39:35.000 -07:00 1769bdaa8d6d
| C
o 5548374c0794 martinvonz@google.com 2021-05-26 12:39:30.000 -07:00 de5690380f40
| B2
o ce619d39bd96 martinvonz@google.com 2021-05-26 12:39:20.000 -07:00 47e336632333
| B1
o cf49e6bec410 martinvonz@google.com 2021-05-26 12:39:12.000 -07:00 661432c51c08
~ A
@ qzvqqupxlkot martinvonz@google.com 2023-02-12 15:07:41.946 -08:00 2370ddf3fa39
│ C
o puqltuttrvzp martinvonz@google.com 2023-02-12 15:07:33.000 -08:00 daa6ffd5a09a
│ B2
o ovknlmrokpkl martinvonz@google.com 2023-02-12 15:07:24.000 -08:00 7d7c6e6bd0b4
│ B1
o nuvyytnqlquo martinvonz@google.com 2023-02-12 15:07:05.000 -08:00 5dda2f097aa9
│ A
│ o kntqzsqtnspv martinvonz@google.com 2023-02-12 14:56:59.000 -08:00 5d39e19dac36
├─╯ Say goodbye
o orrkosyozysx octocat@nowhere.com 2012-03-06 15:06:50.000 -08:00 master 7fd1a60b01f9
│ (empty) Merge pull request #6 from Spaceghost/patch-1
~
```
We now have a few commits, where A, B1, and B2 modify the same file, while C
modifies a different file. Let's now rebase B2 directly onto A:
```shell script
$ jj rebase -s 5548374c0794 -d cf49e6bec410
$ jj rebase -s puqltuttrvzp -d nuvyytnqlquo
Rebased 2 commits
Working copy now at: 9195b6d2e8dc C
Working copy now at: 1978b53430cd C
Added 0 files, modified 1 files, removed 0 files
$ jj log
@ 8e6178b84ffb martinvonz@google.com 2021-05-26 12:39:35.000 -07:00 66274d5a7d2d conflict
| C
o 5548374c0794 martinvonz@google.com 2021-05-26 12:39:30.000 -07:00 0c305a9e6b27 conflict
| B2
| o ce619d39bd96 martinvonz@google.com 2021-05-26 12:39:20.000 -07:00 47e336632333
|/ B1
o cf49e6bec410 martinvonz@google.com 2021-05-26 12:39:12.000 -07:00 661432c51c08
~ A
@ qzvqqupxlkot martinvonz@google.com 2023-02-12 15:08:33.000 -08:00 1978b53430cd conflict
│ C
o puqltuttrvzp martinvonz@google.com 2023-02-12 15:08:33.000 -08:00 f7fb5943ee41 conflict
│ B2
│ o ovknlmrokpkl martinvonz@google.com 2023-02-12 15:07:24.000 -08:00 7d7c6e6bd0b4
├─╯ B1
o nuvyytnqlquo martinvonz@google.com 2023-02-12 15:07:05.000 -08:00 5dda2f097aa9
│ A
│ o kntqzsqtnspv martinvonz@google.com 2023-02-12 14:56:59.000 -08:00 5d39e19dac36
├─╯ Say goodbye
o orrkosyozysx octocat@nowhere.com 2012-03-06 15:06:50.000 -08:00 master 7fd1a60b01f9
│ (empty) Merge pull request #6 from Spaceghost/patch-1
~
```
There are several things worth noting here. First, the `jj rebase` command said
@ -231,15 +230,15 @@ Now let's resolve the conflict in B2. We'll do that by creating a new commit on
top of B2. Once we've resolved the conflict, we'll squash the conflict
resolution into the conflicted B2. That might look like this:
```shell script
$ jj new 5548374c0794 # Replace the hash by what you have for B2
Working copy now at: 619f58d8a988 (no description set)
Added 0 files, modified 1 files, removed 0 files
$ jj new puqltuttrvzp # Replace the ID by what you have for B2
Working copy now at: c7068d1c23fd (no description set)
Added 0 files, modified 0 files, removed 1 files
$ jj st
Parent commit: 5548374c0794 B2
Working copy : 619f58d8a988 (no description set)
Parent commit: f7fb5943ee41 B2
Working copy : c7068d1c23fd (no description set)
The working copy is clean
There are unresolved conflicts at these paths:
file1
file1 2-sided conflict
$ cat file1
<<<<<<<
%%%%%%%
@ -251,25 +250,30 @@ b2
$ echo resolved > file1
$ jj squash
Rebased 1 descendant commits
Working copy now at: e659edc4a9fc (no description set)
Working copy now at: e3c279cc2043 (no description set)
$ jj log
@ 461f38324592 martinvonz@google.com 2021-05-26 12:53:08.000 -07:00 e659edc4a9fc
| (empty) (no description set)
| o 8e6178b84ffb martinvonz@google.com 2021-05-26 12:39:35.000 -07:00 69dbcf76642a
|/ C
o 5548374c0794 martinvonz@google.com 2021-05-26 12:39:30.000 -07:00 576d647acf36
| B2
| o ce619d39bd96 martinvonz@google.com 2021-05-26 12:39:20.000 -07:00 47e336632333
|/ B1
o cf49e6bec410 martinvonz@google.com 2021-05-26 12:39:12.000 -07:00 661432c51c08
~ A
@ ntxxqymrlvxu martinvonz@google.com 2023-02-12 19:34:09.000 -08:00 e3c279cc2043
│ (empty) (no description set)
│ o qzvqqupxlkot martinvonz@google.com 2023-02-12 19:34:09.000 -08:00 b9da9d28b26b
├─╯ C
o puqltuttrvzp martinvonz@google.com 2023-02-12 19:34:09.000 -08:00 2c7a658e2586
│ B2
│ o ovknlmrokpkl martinvonz@google.com 2023-02-12 15:07:24.000 -08:00 7d7c6e6bd0b4
├─╯ B1
o nuvyytnqlquo martinvonz@google.com 2023-02-12 15:07:05.000 -08:00 5dda2f097aa9
│ A
│ o kntqzsqtnspv martinvonz@google.com 2023-02-12 14:56:59.000 -08:00 5d39e19dac36
├─╯ Say goodbye
o orrkosyozysx octocat@nowhere.com 2012-03-06 15:06:50.000 -08:00 master 7fd1a60b01f9
│ (empty) Merge pull request #6 from Spaceghost/patch-1
~
```
Note that commit C automatically got rebased on top of the resolved B2, and that
C is also resolved (since it modified only a different file).
By the way, if we want to get rid of B1 now, we can run `jj abandon
47e336632333`. That will hide the commit from the log output and will rebase any
ovknlmrokpkl`. That will hide the commit from the log output and will rebase any
descendants to its parent.
## The operation log
@ -279,17 +283,17 @@ the "operation log". Use the `jj op` (short for `jj operation`) family of
commands to interact with it. To list the operations, use `jj op log`:
```shell script
$ jj op log
@ 5bd384507342 martinvonz@<hostname> 2021-05-26 12:53:08.339 -07:00 - 2021-05-26 12:53:08.350 -07:00
| squash commit 41f0d2289b568bfcdcf35f73d4f70f3ab6696398
| args: jj squash
o 2fd266a8a2e0 martinvonz@<hostname> 2021-05-26 12:53:08.335 -07:00 - 2021-05-26 12:53:08.338 -07:00
| commit working copy
o 1e6dd15305a3 martinvonz@<hostname> 2021-05-26 12:52:39.374 -07:00 - 2021-05-26 12:52:39.382 -07:00
| check out commit 0c305a9e6b274bc09b2bca85635299dcfdc6811c
| args: jj co 0c305a9e6b27
o 401652a2f61e martinvonz@<hostname> 2021-05-26 12:44:51.872 -07:00 - 2021-05-26 12:44:51.882 -07:00
| rebase commit de5690380f40f3f7fc6b7d66d43a4f68ee606228 and descendants
| args: jj rebase -s de5690380f40 -d 661432c51c08
@ d3b77addea49 martinvonz@vonz.svl.corp.google.com 2023-02-12 19:34:09.549 -08:00 - 2023-02-12 19:34:09.552 -08:00
│ squash commit 63874fe6c4fba405ffc38b0dd926f03b715cf7ef
│ args: jj squash
o 6fc1873c1180 martinvonz@vonz.svl.corp.google.com 2023-02-12 19:34:09.548 -08:00 - 2023-02-12 19:34:09.549 -08:00
│ snapshot working copy
o ed91f7bcc1fb martinvonz@vonz.svl.corp.google.com 2023-02-12 19:32:46.007 -08:00 - 2023-02-12 19:32:46.008 -08:00
│ new empty commit
│ args: jj new puqltuttrvzp
o 367400773f87 martinvonz@vonz.svl.corp.google.com 2023-02-12 15:08:33.917 -08:00 - 2023-02-12 15:08:33.920 -08:00
│ rebase commit daa6ffd5a09a8a7d09a65796194e69b7ed0a566d and descendants
│ args: jj rebase -s puqltuttrvzp -d nuvyytnqlquo
[many more lines]
```
@ -297,18 +301,23 @@ The most useful command is `jj undo` (alias for `jj op undo`), which will undo
an operation. By default, it will undo the most recent operation. Let's try it:
```shell script
$ jj undo
Working copy now at: 41f0d2289b56
Working copy now at: 63874fe6c4fb (no description set)
$ jj log
@ b1e3a4afde5e martinvonz@google.com 2021-05-26 12:52:39.000 -07:00 41f0d2289b56
| (no description set)
| o 8e6178b84ffb martinvonz@google.com 2021-05-26 12:39:35.000 -07:00 66274d5a7d2d conflict
|/ C
o 5548374c0794 martinvonz@google.com 2021-05-26 12:39:30.000 -07:00 0c305a9e6b27 conflict
| B2
| o ce619d39bd96 martinvonz@google.com 2021-05-26 12:39:20.000 -07:00 47e336632333
|/ B1
o cf49e6bec410 martinvonz@google.com 2021-05-26 12:39:12.000 -07:00 661432c51c08
~ A
@ zxoosnnpvvpn martinvonz@google.com 2023-02-12 19:34:09.000 -08:00 63874fe6c4fb
│ (no description set)
│ o qzvqqupxlkot martinvonz@google.com 2023-02-12 15:08:33.000 -08:00 1978b53430cd conflict
├─╯ C
o puqltuttrvzp martinvonz@google.com 2023-02-12 15:08:33.000 -08:00 f7fb5943ee41 conflict
│ B2
│ o ovknlmrokpkl martinvonz@google.com 2023-02-12 15:07:24.000 -08:00 7d7c6e6bd0b4
├─╯ B1
o nuvyytnqlquo martinvonz@google.com 2023-02-12 15:07:05.000 -08:00 5dda2f097aa9
│ A
│ o kntqzsqtnspv martinvonz@google.com 2023-02-12 14:56:59.000 -08:00 5d39e19dac36
├─╯ Say goodbye
o orrkosyozysx octocat@nowhere.com 2012-03-06 15:06:50.000 -08:00 master 7fd1a60b01f9
│ (empty) Merge pull request #6 from Spaceghost/patch-1
~
```
As you can perhaps see, that undid the `jj squash` invocation we used for
squashing the conflict resolution into commit B2 earlier. Notice that it also
@ -316,7 +325,7 @@ updated the working copy.
You can also view the repo the way it looked after some earlier operation. For
example, if you want to see `jj log` output right after the `jj rebase` operation,
try `jj log --at-op=401652a2f61e` but use the hash from your own `jj op log`.
try `jj log --at-op=367400773f87` but use the hash from your own `jj op log`.
## Moving content changes between commits
@ -332,20 +341,23 @@ diff-editor = "vimdiff"
We'll need some more complex content to test these commands, so let's create a
few more commits:
```shell script
$ jj new origin/main -m abc; printf 'a\nb\nc\n' > file
Working copy now at: 61b0efa09dbe abc
$ jj new master -m abc; printf 'a\nb\nc\n' > file
Working copy now at: f94e49cf2547 abc
Added 0 files, modified 0 files, removed 1 files
$ jj new -m ABC; printf 'A\nB\nc\n' > file
Working copy now at: 9d97c5018b23 ABC
Working copy now at: 6f30cd1fb351 ABC
$ jj new -m ABCD; printf 'A\nB\nC\nD\n' > file
Working copy now at: c5a985bc3f41 ABCD
$ jj log
@ 874f2d307594 martinvonz@google.com 2021-05-26 14:36:38.000 -07:00 687009839bae
| ABCD
o 2bbc0c1eb382 martinvonz@google.com 2021-05-26 14:36:26.000 -07:00 ad9b1ce3b5d0
| ABC
o 3680117711f5 martinvonz@google.com 2021-05-26 14:36:05.000 -07:00 a355fb177b21
~ abc
Working copy now at: a67491542e10 ABCD
$ jj log -r master:@
@ mrxqplykzpkw martinvonz@google.com 2023-02-12 19:38:21.000 -08:00 b98c607bf87f
│ ABCD
o kwtuwqnmqyqp martinvonz@google.com 2023-02-12 19:38:12.000 -08:00 30aecc0871ea
│ ABC
o ztqrpvnwqqnq martinvonz@google.com 2023-02-12 19:38:03.000 -08:00 510022615871
│ abc
o orrkosyozysx octocat@nowhere.com 2012-03-06 15:06:50.000 -08:00 master 7fd1a60b01f9
│ (empty) Merge pull request #6 from Spaceghost/patch-1
~
```
We "forgot" to capitalize "c" in the second commit when we capitalized the other
@ -357,7 +369,8 @@ into its parent. `jj squash -i` moves only part of the changes into its parent.
Now try that:
```shell script
$ jj squash -i
Working copy now at: 4b4c714b36aa ABCD
Using default editor 'meld'; you can change this by setting ui.diff-editor
Working copy now at: 52a6c7fda1e3 ABCD
```
That will bring up Meld with a diff of the changes in the "ABCD" commit. Modify
the right side of the diff to have the desired end state in "ABC" by removing
@ -381,9 +394,10 @@ command is `jj diffedit`, which lets you edit the contents of a commit without
checking it out.
```shell script
$ jj diffedit -r @-
Created 2423c134ea70 ABC
Using default editor 'meld'; you can change this by setting ui.diff-editor
Created 70985eaa924f ABC
Rebased 1 descendant commits
Working copy now at: d31c52e8ca41 ABCD
Working copy now at: 1c72cd50525d ABCD
Added 0 files, modified 1 files, removed 0 files
```
When Meld starts, edit the right side by e.g. adding something to the first