D7658: rust-index: expose a method to retrieve the C index

[marmoute (Pierre-Yves David)]

marmoute created this revision.
Herald added subscribers: mercurial-devel, mjpieters, kevincox, durin42.
Herald added a reviewer: hg-reviewers.

REVISION SUMMARY
  The code for `shortesthexnodeidprefix` need to access the actual C index. For
  now we grant its wish and expose a method to do so. Once we have the nodemap in
  Rust, we will be able to implement the same feature from rust and we will be
  able to drop this method.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D7658

AFFECTED FILES
  rust/hg-cpython/src/revlog.rs
  tests/test-rust-revlog.py

CHANGE DETAILS

diff --git a/tests/test-rust-revlog.py b/tests/test-rust-revlog.py
--- a/tests/test-rust-revlog.py
+++ b/tests/test-rust-revlog.py
@@ -25,6 +25,13 @@
         rustidx = revlog.MixedIndex(idx)
         self.assertEqual(rustidx.headrevs(), idx.headrevs())
 
+    def test_get_cindex(self):
+        # drop me once we no longer need the method for shortest node
+        idx = self.parseindex()
+        rustidx = revlog.MixedIndex(idx)
+        cidx = rustidx.get_cindex()
+        self.assertTrue(idx is cidx)
+
     def test_len(self):
         idx = self.parseindex()
         rustidx = revlog.MixedIndex(idx)
diff --git a/rust/hg-cpython/src/revlog.rs b/rust/hg-cpython/src/revlog.rs
--- a/rust/hg-cpython/src/revlog.rs
+++ b/rust/hg-cpython/src/revlog.rs
@@ -29,6 +29,17 @@
             cindex::Index::new(py, cindex)?))
     }
 
+    /// Compatibility layer used for Python consumers needing access to the C index
+    ///
+    /// Only use case so far is `scmutil.shortesthexnodeidprefix`,
+    /// that may need to build a custom `nodetree`, based on a specified revset.
+    /// With a Rust implementation of the nodemap, we will be able to get rid of
+    /// this, by exposing our own standalone nodemap class,
+    /// ready to accept `MixedIndex`.
+    def get_cindex(&self) -> PyResult<PyObject> {
+        Ok(self.cindex(py).borrow().inner().clone_ref(py))
+    }
+
 
     // Reforwarded C index API
 



To: marmoute, #hg-reviewers
Cc: durin42, kevincox, mjpieters, mercurial-devel