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Restructure git diff state management to allow viewing buffers with different diff bases (#21258)

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This is a pure refactor of our Git diff state management. Buffers are no
longer are associated with one single diff (the unstaged changes).
Instead, there is an explicit project API for retrieving a buffer's
unstaged changes, and the `Editor` view layer is responsible for
choosing what diff to associate with a buffer.

The reason for this change is that we'll soon want to add multiple "git
diff views" to Zed, one of which will show the *uncommitted* changes for
a buffer. But that view will need to co-exist with other views of the
same buffer, which may want to show the unstaged changes.

### Todo

* [x] Get git gutter and git hunks working with new structure
* [x] Update editor tests to use new APIs
* [x] Update buffer tests
* [x] Restructure remoting/collab protocol
* [x] Update assertions about staged text in
`random_project_collaboration_tests`
* [x] Move buffer tests for git diff management to a new spot, using the
new APIs

Release Notes:

- N/A

---------

Co-authored-by: Richard <richard@zed.dev>
Co-authored-by: Cole <cole@zed.dev>
Co-authored-by: Conrad <conrad@zed.dev>
This commit is contained in:
Max Brunsfeld 2024-12-04 15:02:33 -08:00 • committed by GitHub
parent 31796171de
commit a2115e7242
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GPG key ID: B5690EEEBB952194
29 changed files with 1832 additions and 1651 deletions
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48
crates/language/src/buffer_tests.rs
View file

@ -6,7 +6,6 @@ use crate::Buffer;
use clock::ReplicaId;
use collections::BTreeMap;
use futures::FutureExt as _;
use git::diff::assert_hunks;
use gpui::{AppContext, BorrowAppContext, Model};
use gpui::{Context, TestAppContext};
use indoc::indoc;
@ -2608,15 +2607,6 @@ fn test_branch_and_merge(cx: &mut TestAppContext) {
);
});
// The branch buffer maintains a diff with respect to its base buffer.
start_recalculating_diff(&branch, cx);
cx.run_until_parked();
assert_diff_hunks(
&branch,
cx,
&[(1..2, "", "1.5\n"), (3..4, "three\n", "THREE\n")],
);
// Edits to the base are applied to the branch.
base.update(cx, |buffer, cx| {
buffer.edit([(Point::new(0, 0)..Point::new(0, 0), "ZERO\n")], None, cx)
@ -2626,21 +2616,6 @@ fn test_branch_and_merge(cx: &mut TestAppContext) {
assert_eq!(buffer.text(), "ZERO\none\n1.5\ntwo\nTHREE\n");
});
// Until the git diff recalculation is complete, the git diff references
// the previous content of the base buffer, so that it stays in sync.
start_recalculating_diff(&branch, cx);
assert_diff_hunks(
&branch,
cx,
&[(2..3, "", "1.5\n"), (4..5, "three\n", "THREE\n")],
);
cx.run_until_parked();
assert_diff_hunks(
&branch,
cx,
&[(2..3, "", "1.5\n"), (4..5, "three\n", "THREE\n")],
);
// Edits to any replica of the base are applied to the branch.
base_replica.update(cx, |buffer, cx| {
buffer.edit([(Point::new(2, 0)..Point::new(2, 0), "2.5\n")], None, cx)
@ -2731,29 +2706,6 @@ fn test_undo_after_merge_into_base(cx: &mut TestAppContext) {
branch.read_with(cx, |branch, _| assert_eq!(branch.text(), "ABCdefgHIjk"));
}
fn start_recalculating_diff(buffer: &Model<Buffer>, cx: &mut TestAppContext) {
buffer
.update(cx, |buffer, cx| buffer.recalculate_diff(cx).unwrap())
.detach();
}
#[track_caller]
fn assert_diff_hunks(
buffer: &Model<Buffer>,
cx: &mut TestAppContext,
expected_hunks: &[(Range<u32>, &str, &str)],
) {
let (snapshot, diff_base) = buffer.read_with(cx, |buffer, _| {
(buffer.snapshot(), buffer.diff_base().unwrap().to_string())
});
assert_hunks(
snapshot.git_diff_hunks_intersecting_range(Anchor::MIN..Anchor::MAX),
&snapshot,
&diff_base,
expected_hunks,
);
}
#[gpui::test(iterations = 100)]
fn test_random_collaboration(cx: &mut AppContext, mut rng: StdRng) {
let min_peers = env::var("MIN_PEERS")