Improve performance via Triemap in workspace

packages/foam-vscode/package.json

@@ -720,6 +720,7 @@
     "lodash": "^4.17.21",
     "lru-cache": "^7.14.1",
     "markdown-it-regex": "^0.2.0",
+    "mnemonist": "^0.39.8",
     "path-browserify": "^1.0.1",
     "remark-frontmatter": "^2.0.0",
     "remark-parse": "^8.0.2",

packages/foam-vscode/src/core/model/workspace.ts

@@ -6,6 +6,7 @@ import { Emitter } from '../common/event';
 import { ResourceProvider } from './provider';
 import { IDisposable } from '../common/lifecycle';
 import { IDataStore } from '../services/datastore';
+import TrieMap from 'mnemonist/trie-map';
 
 export class FoamWorkspace implements IDisposable {
   private onDidAddEmitter = new Emitter<Resource>();
@@ -20,7 +21,7 @@ export class FoamWorkspace implements IDisposable {
   /**
    * Resources by path
    */
-  private _resources: Map<string, Resource> = new Map();
+  private _resources: TrieMap<string, Resource> = new TrieMap();
 
   /**
    * @param defaultExtension: The default extension for notes in this workspace (e.g. `.md`)
@@ -33,16 +34,19 @@ export class FoamWorkspace implements IDisposable {
 
   set(resource: Resource) {
     const old = this.find(resource.uri);
-    this._resources.set(normalize(resource.uri.path), resource);
+
+    // store resource
+    this._resources.set(this.getTrieIdentifier(resource.uri.path), resource);
+
     isSome(old)
       ? this.onDidUpdateEmitter.fire({ old: old, new: resource })
       : this.onDidAddEmitter.fire(resource);
     return this;
   }
 
   delete(uri: URI) {
-    const deleted = this._resources.get(normalize(uri.path));
-    this._resources.delete(normalize(uri.path));
+    const deleted = this._resources.get(this.getTrieIdentifier(uri));
+    this._resources.delete(this.getTrieIdentifier(uri));
 
     isSome(deleted) && this.onDidDeleteEmitter.fire(deleted);
     return deleted ?? null;
@@ -57,7 +61,11 @@ export class FoamWorkspace implements IDisposable {
   }
 
   public resources(): IterableIterator<Resource> {
-    return this._resources.values();
+    const resources: Array<Resource> = Array.from(
+      this._resources.values()
+    ).sort(Resource.sortByPath);
+
+    return resources.values();
   }
 
   public get(uri: URI): Resource {
@@ -70,17 +78,21 @@ export class FoamWorkspace implements IDisposable {
   }
 
   public listByIdentifier(identifier: string): Resource[] {
-    const needle = normalize('/' + identifier);
+    let needle = this.getTrieIdentifier(identifier);
+
     const mdNeedle =
-      getExtension(needle) !== this.defaultExtension
-        ? needle + this.defaultExtension
+      getExtension(normalize(identifier)) !== this.defaultExtension
+        ? this.getTrieIdentifier(identifier + this.defaultExtension)
         : undefined;
+
     const resources: Resource[] = [];
-    for (const key of this._resources.keys()) {
-      if (key.endsWith(mdNeedle) || key.endsWith(needle)) {
-        resources.push(this._resources.get(normalize(key)));
-      }
+
+    this._resources.find(needle).forEach(elm => resources.push(elm[1]));
+
+    if (mdNeedle) {
+      this._resources.find(mdNeedle).forEach(elm => resources.push(elm[1]));
     }
+
     return resources.sort(Resource.sortByPath);
   }
 
@@ -119,9 +131,32 @@ export class FoamWorkspace implements IDisposable {
     return identifier;
   }
 
+  /**
+   * Returns a note identifier in reversed order. Used to optimise the storage of notes in
+   * the workspace to optimise retrieval of notes.
+   *
+   * @param reference the URI path to reverse
+   */
+  private getTrieIdentifier(reference: URI | string): string {
+    let path: string;
+    if (reference instanceof URI) {
+      path = (reference as URI).path;
+    } else {
+      path = reference as string;
+    }
+
+    let reversedPath = normalize(path).split('/').reverse().join('/');
+
+    if (reversedPath.indexOf('/') < 0) {
+      reversedPath = reversedPath + '/';
+    }
+
+    return reversedPath;
+  }
+
   public find(reference: URI | string, baseUri?: URI): Resource | null {
     if (reference instanceof URI) {
-      return this._resources.get(normalize((reference as URI).path)) ?? null;
+      return this._resources.get(this.getTrieIdentifier(reference)) ?? null;
     }
     let resource: Resource | null = null;
     const [path, fragment] = (reference as string).split('#');
@@ -135,7 +170,7 @@ export class FoamWorkspace implements IDisposable {
           : isSome(baseUri)
           ? baseUri.resolve(candidate).path
           : null;
-        resource = this._resources.get(normalize(searchKey));
+        resource = this._resources.get(this.getTrieIdentifier(searchKey));
         if (resource) {
           break;
         }

packages/foam-vscode/src/features/navigation-provider.spec.ts

@@ -231,6 +231,10 @@ describe('Document navigation', () => {
         doc,
         new vscode.Position(0, 26)
       );
+
+      // Make sure the references are sorted by position, so we match the right expectation
+      refs.sort((a, b) => a.range.start.character - b.range.start.character);
+
       expect(refs.length).toEqual(2);
       expect(refs[0]).toEqual({
         uri: toVsCodeUri(fileB.uri),