branch details with gix: 2.6x faster!

Cargo.toml

@@ -36,8 +36,7 @@ resolver = "2"
 [workspace.dependencies]
 bstr = "1.10.0"
 # Add the `tracing` or `tracing-detail` features to see more of gitoxide in the logs. Useful to see which programs it invokes.
-gix = { git = "https://github.com/Byron/gitoxide", rev = "d51f330e9d364c6f7b068116b59bf5c0160e47af", default-features = false, features = [
-] }
+gix = { git = "https://github.com/Byron/gitoxide", rev = "242fedc973c56b6c1b6f150af99dda972a67f547", default-features = false, features = [] }
 git2 = { version = "0.18.3", features = [
     "vendored-openssl",
     "vendored-libgit2",
@@ -52,6 +51,8 @@ fslock = "0.2.1"
 parking_lot = "0.12.3"
 futures = "0.3.30"
 toml = "0.8.13"
+tracing = "0.1.40"
+tracing-subscriber = "0.3.17"
 
 gitbutler-id = { path = "crates/gitbutler-id" }
 gitbutler-git = { path = "crates/gitbutler-git" }

crates/gitbutler-branch-actions/Cargo.toml

@@ -6,10 +6,10 @@ authors = ["GitButler <[email protected]>"]
 publish = false
 
 [dependencies]
-tracing = "0.1.40"
+tracing.workspace = true
 anyhow = "1.0.86"
 git2.workspace = true
-gix.workspace = true
+gix = { workspace = true, features = ["blob-diff"] }
 tokio.workspace = true
 gitbutler-oplog.workspace = true
 gitbutler-repo.workspace = true
@@ -43,7 +43,7 @@ reqwest = { version = "0.12.4", features = ["json"] }
 once_cell = "1.19"
 pretty_assertions = "1.4"
 gitbutler-testsupport.workspace = true
-gix = { workspace = true, features = ["max-performance-safe"] }
+gix = { workspace = true, features = ["max-performance"] }
 gitbutler-git = { workspace = true, features = ["test-askpass-path"] }
 glob = "0.3.1"
 serial_test = "3.1.1"

crates/gitbutler-branch-actions/benches/branches.rs

@@ -1,5 +1,5 @@
 use criterion::{black_box, criterion_group, criterion_main, Criterion, Throughput};
-use gitbutler_branch_actions::list_branches;
+use gitbutler_branch_actions::{get_branch_listing_details, list_branches};
 use gitbutler_command_context::CommandContext;
 use gitbutler_project::Project;
 
@@ -50,5 +50,74 @@ pub fn benchmark_list_branches(c: &mut Criterion) {
     }
 }
 
-criterion_group!(benches, benchmark_list_branches);
+pub fn benchmark_branch_details(c: &mut Criterion) {
+    for (bench_name, (repo_name, branch_name, files_to_diff, script_name)) in [
+        (
+            "branch-details [many branches no change]",
+            ("many-local", "virtual", 0, "branch-benches.sh"),
+        ),
+        (
+            "branch-details [tiny no change]",
+            (
+                "one-vbranch-on-integration-two-remotes",
+                "main",
+                0,
+                "for-listing.sh",
+            ),
+        ),
+        (
+            "branch-details [big repo no change]",
+            (
+                "big-repo-clone",
+                "no-change",
+                0,
+                "branch-details-benches.sh",
+            ),
+        ),
+        (
+            "branch-details [every-file-changed]",
+            (
+                "big-repo-clone-one-commit-ahead",
+                "change-with-new-content",
+                10_000,
+                "branch-details-benches.sh",
+            ),
+        ),
+    ] {
+        let mut group = c.benchmark_group(bench_name);
+        let project = fixture_project(repo_name, script_name);
+        if files_to_diff != 0 {
+            group.throughput(Throughput::Elements(files_to_diff));
+        }
+        group.bench_function("list details of known branch", |b| {
+            b.iter(|| {
+                let ctx = CommandContext::open(&project).unwrap();
+                let details =
+                    get_branch_listing_details(black_box(&ctx), Some(branch_name)).unwrap();
+                assert_eq!(details.len(), 1, "{script_name}:{repo_name}:{branch_name}");
+                assert_eq!(
+                    details[0].number_of_files, files_to_diff as usize,
+                    "currently it creates a new vbranch for changes in local-commits, something we leverage here"
+                );
+            })
+        });
+    }
+
+    let mut group = c.benchmark_group("branch-details [revwalk]");
+    let project = fixture_project("revwalk-repo", "branch-details-benches.sh");
+    group.throughput(Throughput::Elements(100 + 15 + 50));
+    group.bench_function("count commits/collect authors", |b| {
+        b.iter(|| {
+            let ctx = CommandContext::open(&project).unwrap();
+            let details = get_branch_listing_details(
+                black_box(&ctx),
+                ["feature", "main", "non-virtual-feature"],
+            )
+            .unwrap();
+            assert_eq!(details.len(), 3);
+        })
+    });
+}
+
+criterion_group!(benches, benchmark_list_branches, benchmark_branch_details);
 criterion_main!(benches);

crates/gitbutler-branch-actions/src/base.rs

@@ -314,11 +314,12 @@ fn _print_tree(repo: &git2::Repository, tree: &git2::Tree) -> Result<()> {
     Ok(())
 }
 
-// try to update the target branch
-// this means that we need to:
-// determine if what the target branch is now pointing to is mergeable with our current working directory
-// merge the target branch into our current working directory
-// update the target sha
+/// try to update the target branch
+/// this means that we need to:
+/// - determine if what the target branch is now pointing to is mergeable with our current working directory,
+/// - merge the target branch into our current working directory
+/// - update the target sha
+/// - return all conflicting references that were unapplied to avoid the conflict
 pub(crate) fn update_base_branch(
     ctx: &CommandContext,
     perm: &mut WorktreeWritePermission,