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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import * as vscode from 'vscode';
export const MAX_FILES = 10;
export const MAX_FILE_AGE_MINUTES = 5;
interface RecentFile {
uri: vscode.Uri;
timestamp: number;
}
/**
* Keeps track of the 10 most recently-opened files
* opened less than 5 min ago. If a file is closed or deleted,
* it will be removed. If the max length is reached, older files will get removed first.
*/
export class RecentFilesManager {
private readonly files: RecentFile[] = [];
private readonly onDidChangeEmitter = new vscode.EventEmitter<void>();
readonly onDidChange = this.onDidChangeEmitter.event;
private debounceTimer: NodeJS.Timeout | undefined;
constructor(private readonly context: vscode.ExtensionContext) {
const editorWatcher = vscode.window.onDidChangeActiveTextEditor(
(editor) => {
if (editor) {
this.add(editor.document.uri);
}
},
);
const deleteWatcher = vscode.workspace.onDidDeleteFiles((event) => {
for (const uri of event.files) {
this.remove(uri);
}
});
const closeWatcher = vscode.workspace.onDidCloseTextDocument((document) => {
this.remove(document.uri);
});
const renameWatcher = vscode.workspace.onDidRenameFiles((event) => {
for (const { oldUri, newUri } of event.files) {
this.remove(oldUri, false);
this.add(newUri);
}
});
const selectionWatcher = vscode.window.onDidChangeTextEditorSelection(
() => {
this.fireWithDebounce();
},
);
context.subscriptions.push(
editorWatcher,
deleteWatcher,
closeWatcher,
renameWatcher,
selectionWatcher,
);
}
private fireWithDebounce() {
if (this.debounceTimer) {
clearTimeout(this.debounceTimer);
}
this.debounceTimer = setTimeout(() => {
this.onDidChangeEmitter.fire();
}, 50); // 50ms
}
private remove(uri: vscode.Uri, fireEvent = true) {
const index = this.files.findIndex(
(file) => file.uri.fsPath === uri.fsPath,
);
if (index !== -1) {
this.files.splice(index, 1);
if (fireEvent) {
this.fireWithDebounce();
}
}
}
add(uri: vscode.Uri) {
if (uri.scheme !== 'file') {
return;
}
this.remove(uri, false);
this.files.unshift({ uri, timestamp: Date.now() });
if (this.files.length > MAX_FILES) {
this.files.pop();
}
this.fireWithDebounce();
}
get recentFiles(): Array<{ filePath: string; timestamp: number }> {
const now = Date.now();
const maxAgeInMs = MAX_FILE_AGE_MINUTES * 60 * 1000;
return this.files
.filter((file) => now - file.timestamp < maxAgeInMs)
.map((file) => ({
filePath: file.uri.fsPath,
timestamp: file.timestamp,
}));
}
}
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