--- a/rust/hg-core/src/revlog/index.rs Thu Aug 03 15:01:34 2023 +0200
+++ b/rust/hg-core/src/revlog/index.rs Thu Aug 03 15:50:14 2023 +0200
@@ -512,6 +512,50 @@
}
}
+ /// Obtain the delta chain for a revision.
+ ///
+ /// `stop_rev` specifies a revision to stop at. If not specified, we
+ /// stop at the base of the chain.
+ ///
+ /// Returns a 2-tuple of (chain, stopped) where `chain` is a vec of
+ /// revs in ascending order and `stopped` is a bool indicating whether
+ /// `stoprev` was hit.
+ pub fn delta_chain(
+ &self,
+ rev: Revision,
+ stop_rev: Option<Revision>,
+ ) -> Result<(Vec<Revision>, bool), HgError> {
+ let mut current_rev = rev;
+ let mut entry = self.get_entry(rev).unwrap();
+ let mut chain = vec![];
+ while current_rev.0 != entry.base_revision_or_base_of_delta_chain().0
+ && stop_rev.map(|r| r != current_rev).unwrap_or(true)
+ {
+ chain.push(current_rev);
+ let new_rev = if self.uses_generaldelta() {
+ entry.base_revision_or_base_of_delta_chain()
+ } else {
+ UncheckedRevision(current_rev.0 - 1)
+ };
+ if new_rev.0 == NULL_REVISION.0 {
+ break;
+ }
+ current_rev = self.check_revision(new_rev).ok_or_else(|| {
+ HgError::corrupted(format!("Revision {new_rev} out of range"))
+ })?;
+ entry = self.get_entry(current_rev).unwrap()
+ }
+
+ let stopped = if stop_rev.map(|r| current_rev == r).unwrap_or(false) {
+ true
+ } else {
+ chain.push(current_rev);
+ false
+ };
+ chain.reverse();
+ Ok((chain, stopped))
+ }
+
pub fn find_snapshots(
&self,
start_rev: UncheckedRevision,