This will be needed to test functionality for showing shortest
unique prefix for commit and change ids. As a bonus, this also
allows us to test log output with change ids.
As another bonus, this will prevent occasional CI failures like
https://github.com/martinvonz/jj/actions/runs/3817554687/jobs/6493881468.
"jj log -p --summary" now shows summary and color-words diff, like
"hg log -p --stat".
Handling of "-p" is tricky. I first considered "-p" would turn on the default
diff output, but I found it would be confusing if "jj log -p --git" showed
both color-words and git diffs. So the default format is inserted only if
no --git nor --color-words is explicitly specified.
I can't see any reason the user would want to specify revisions
matching the empty string, so let's disallow it. I created a custom
type for revision arguments instead of repeating `value_parser =
NonEmptyStringValueParser::new()`.
Let's acknowledge everyone's contributions by replacing "Google LLC"
in the copyright header by "The Jujutsu Authors". If I understand
correctly, it won't have any legal effect, but maybe it still helps
reduce concerns from contributors (though I haven't heard any
concerns).
Google employees can read about Google's policy at
go/releasing/contributions#copyright.
In the current implementation, tree is diffed twice if both PATH and -p
are specified. If this adds significant cost, we'll need to reimplement
it without using a revset abstraction (or maybe adjust revset/graph API.)
It can be confusing that some commits (typically the working copy)
don't have a description. Let's show a placeholder text in such cases.
I chose the format to match the "(no email configured)" message we
already have.
This adds a `--reversed` flag to `jj log` to show commits with later
commits further down. It works both with and without the graph.
Since the graph-drawing code is already independent of the
relationship between commits, it doesn't need any updating.
`log -s/--summary` and `log --git` without `-p` don't do anything. I
also don't think it's very useful to pass these flags in an alias,
where you would then sometimes also pass `-p` to see the diff summary
in the output. We already have the `diff.format` config for that use
case. So let's make both of these flags imply `-p`.
I implemented it by making the `diff_format` variable an
`Option<DiffFormat>`, which is set iff we should show a patch. That
way we have the condition in one place, and the places we use it
cannot forget to check it.
"log -p | less" is the option I often use with hg/git to find interesting
bits from the changelog, and I think it's also valid with jj. Unlike
"hg log -p --stat", "jj log -p --summary" does not show both diff summary
and patch to reflect the internal structure. This behavoir is arguable and
may be changed later.
The logic of show_patch() is extracted from cmd_show().
