Merge branch 'fast-repository-loading'

After some completely non-scientific benchmarking, these patches bring down the
loading time for a real-world repository from over 20 sec to about 17 sec on
debug build of butido and to 5 sec in release build and even to 2 sec after the
filesystem cache got a bit warm.

So I guess we can safely merge this now and be happy with it (and go back to the
more important issues).

1 files changed, 33 insertions, 0 deletions

diff --git a/src/repository/fs/element.rs b/src/repository/fs/element.rs
new file mode 100644
index 0000000..73b97f6
--- /dev/null
+++ b/src/repository/fs/element.rs
@@ -0,0 +1,33 @@
+//
+// Copyright (c) 2020-2021 science+computing ag and other contributors
+//
+// This program and the accompanying materials are made
+// available under the terms of the Eclipse Public License 2.0
+// which is available at https://www.eclipse.org/legal/epl-2.0/
+//
+// SPDX-License-Identifier: EPL-2.0
+//
+
+use std::collections::HashMap;
+
+use crate::repository::fs::path::PathComponent;
+
+/// One element in the tree inside FileSystemRepresentation
+///
+/// This is either a File, or a Directory that contains more (Files or Directories).
+#[derive(Debug)]
+pub enum Element {
+    File(String),
+    Dir(HashMap<PathComponent, Element>)
+}
+
+impl Element {
+    /// Helper fn to get the directory contents of the element, if the element is an Element::Dir
+    pub fn get_map_mut(&mut self) -> Option<&mut HashMap<PathComponent, Element>> {
+        match self {
+            Element::File(_) => None,
+            Element::Dir(ref mut hm) => Some(hm),
+        }
+    }
+}
+