af372053

Fix diff callback error on large diffs

a73x   2026-03-21 07:53

The diff print callback returned false to cap output at 5000 lines,
but libgit2 treats false as GIT_EUSER (-7) and aborts with an error.
Return true instead to let libgit2 finish normally while simply not
appending further content.

Fixes: 70bb42cf

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---

diff --git a/src/patch.rs b/src/patch.rs
index 2db90af..b5eb128 100644
--- a/src/patch.rs
+++ b/src/patch.rs
@@ -240,7 +240,7 @@ pub fn generate_diff(repo: &Repository, patch: &PatchState) -> Result<String, Er
    let mut lines = 0usize;
    git_diff.print(DiffFormat::Patch, |_delta, _hunk, line| {
        if lines >= 5000 {
            return false;
            return true; // stop appending but don't abort libgit2
        }
        let prefix = match line.origin() {
            '+' => "+",