diff rust/hg-core/src/dirstate.rs @ 47106:52906934b775

dirstate-tree: Add has_dir and has_tracked_dir

A node without a `DirstateMap` entry represents a directory.

Only some values of `EntryState` represent tracked files.
A directory is considered "tracked" if it contains any descendant file that
is tracked. To avoid a sub-tree traversal in `has_tracked_dir` we add a
counter for this. A boolean flag would become insufficent when we implement
remove_file and drop_file.

`add_file_node` is more general than needed here, in anticipation of adding
the `add_file` and `remove_file` methods.

Differential Revision: https://phab.mercurial-scm.org/D10490

--- a/rust/hg-core/src/dirstate.rs	Mon Apr 12 18:42:51 2021 +0200
+++ b/rust/hg-core/src/dirstate.rs	Mon Apr 12 19:46:24 2021 +0200
@@ -66,6 +66,16 @@
     Unknown,
 }
 
+impl EntryState {
+    pub fn is_tracked(self) -> bool {
+        use EntryState::*;
+        match self {
+            Normal | Added | Merged => true,
+            Removed | Unknown => false,
+        }
+    }
+}
+
 impl TryFrom<u8> for EntryState {
     type Error = HgError;