diff rust/hg-core/src/revlog/node.rs @ 46744:b1f2c2b336ec

rhg: `cat` command: print error messages for missing files

And exit with an error code if no file was matched.
This matches the behavior of Python-based hg.

Differential Revision: https://phab.mercurial-scm.org/D10142

--- a/rust/hg-core/src/revlog/node.rs	Mon Mar 08 19:07:29 2021 +0100
+++ b/rust/hg-core/src/revlog/node.rs	Wed Mar 03 16:40:03 2021 +0100
@@ -31,6 +31,9 @@
 /// see also `NODES_BYTES_LENGTH` about it being private.
 const NODE_NYBBLES_LENGTH: usize = 2 * NODE_BYTES_LENGTH;
 
+/// Default for UI presentation
+const SHORT_PREFIX_DEFAULT_NYBBLES_LENGTH: u8 = 12;
+
 /// Private alias for readability and to ease future change
 type NodeData = [u8; NODE_BYTES_LENGTH];
 
@@ -164,6 +167,13 @@
     pub fn as_bytes(&self) -> &[u8] {
         &self.data
     }
+
+    pub fn short(&self) -> NodePrefix {
+        NodePrefix {
+            nybbles_len: SHORT_PREFIX_DEFAULT_NYBBLES_LENGTH,
+            data: self.data,
+        }
+    }
 }
 
 /// The beginning of a binary revision SHA.