From patchwork Mon Jan 27 15:49:28 2020
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Subject: D7789: rust-revlog: a trait for the revlog index
From: phabricator <phabricator@mercurial-scm.org>
X-Patchwork-Id: 44682
Message-Id: <0525d16bbe0b65279e60409248a74178@localhost.localdomain>
To: Phabricator <phabricator@mercurial-scm.org>
Cc: mercurial-devel@mercurial-scm.org
Date: Mon, 27 Jan 2020 15:49:28 +0000

gracinet updated this revision to Diff 19629.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST UPDATE
  https://phab.mercurial-scm.org/D7789?vs=19038&id=19629

BRANCH
  default

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7789/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7789

AFFECTED FILES
  rust/hg-core/src/revlog.rs

CHANGE DETAILS




To: gracinet, #hg-reviewers, martinvonz
Cc: martinvonz, durin42, kevincox, mercurial-devel

diff --git a/rust/hg-core/src/revlog.rs b/rust/hg-core/src/revlog.rs
--- a/rust/hg-core/src/revlog.rs
+++ b/rust/hg-core/src/revlog.rs
@@ -40,3 +40,17 @@
     ParentOutOfRange(Revision),
     WorkingDirectoryUnsupported,
 }
+
+/// The Mercurial Revlog Index
+///
+/// This is currently limited to the minimal interface that is needed for
+/// the [`nodemap`](nodemap/index.html) module
+pub trait RevlogIndex {
+    /// Total number of Revisions referenced in this index
+    fn len(&self) -> usize;
+
+    /// Return a reference to the Node or `None` if rev is out of bounds
+    ///
+    /// `NULL_REVISION` is not considered to be out of bounds.
+    fn node(&self, rev: Revision) -> Option<&Node>;
+}