# HG changeset patch
# User Simon Sapin <simon.sapin@octobus.net>
# Date 2021-03-02 22:18:23
# Node ID df247f58ecee02205bd0b3e5b8d3c31cdb83df03
# Parent  78e6700ab009172adc3f92285ec019a41a230514

rhg: Fall back to Python for unsupported revset syntax

rhg only supports a small subset of the syntax.
On parse error, this gives Python a chance instead of aborting immediately.

Differential Revision: https://phab.mercurial-scm.org/D10097

diff --git a/rust/hg-core/src/revset.rs b/rust/hg-core/src/revset.rs
--- a/rust/hg-core/src/revset.rs
+++ b/rust/hg-core/src/revset.rs
@@ -2,6 +2,7 @@
 //!
 //! <https://www.mercurial-scm.org/repo/hg/help/revsets>
 
+use crate::errors::HgError;
 use crate::repo::Repo;
 use crate::revlog::changelog::Changelog;
 use crate::revlog::revlog::{Revlog, RevlogError};
@@ -28,7 +29,10 @@ pub fn resolve_single(
 
     // TODO: support for the rest of the language here.
 
-    Err(RevlogError::InvalidRevision)
+    Err(
+        HgError::unsupported(format!("cannot parse revset '{}'", input))
+            .into(),
+    )
 }
 
 /// Resolve the small subset of the language suitable for revlogs other than