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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import * as vscode from 'vscode';
import type { File, IdeContext } from '@google/gemini-cli-core';
export const MAX_FILES = 10;
const MAX_SELECTED_TEXT_LENGTH = 16384; // 16 KiB limit
/**
* Keeps track of the workspace state, including open files, cursor position, and selected text.
*/
export class OpenFilesManager {
private readonly onDidChangeEmitter = new vscode.EventEmitter<void>();
readonly onDidChange = this.onDidChangeEmitter.event;
private debounceTimer: NodeJS.Timeout | undefined;
private openFiles: File[] = [];
constructor(private readonly context: vscode.ExtensionContext) {
const editorWatcher = vscode.window.onDidChangeActiveTextEditor(
(editor) => {
if (editor && this.isFileUri(editor.document.uri)) {
this.addOrMoveToFront(editor);
this.fireWithDebounce();
}
},
);
const selectionWatcher = vscode.window.onDidChangeTextEditorSelection(
(event) => {
if (this.isFileUri(event.textEditor.document.uri)) {
this.updateActiveContext(event.textEditor);
this.fireWithDebounce();
}
},
);
const closeWatcher = vscode.workspace.onDidCloseTextDocument((document) => {
if (this.isFileUri(document.uri)) {
this.remove(document.uri);
this.fireWithDebounce();
}
});
const deleteWatcher = vscode.workspace.onDidDeleteFiles((event) => {
for (const uri of event.files) {
if (this.isFileUri(uri)) {
this.remove(uri);
}
}
this.fireWithDebounce();
});
const renameWatcher = vscode.workspace.onDidRenameFiles((event) => {
for (const { oldUri, newUri } of event.files) {
if (this.isFileUri(oldUri)) {
if (this.isFileUri(newUri)) {
this.rename(oldUri, newUri);
} else {
// The file was renamed to a non-file URI, so we should remove it.
this.remove(oldUri);
}
}
}
this.fireWithDebounce();
});
context.subscriptions.push(
editorWatcher,
selectionWatcher,
closeWatcher,
deleteWatcher,
renameWatcher,
);
// Just add current active file on start-up.
if (
vscode.window.activeTextEditor &&
this.isFileUri(vscode.window.activeTextEditor.document.uri)
) {
this.addOrMoveToFront(vscode.window.activeTextEditor);
}
}
private isFileUri(uri: vscode.Uri): boolean {
return uri.scheme === 'file';
}
private addOrMoveToFront(editor: vscode.TextEditor) {
// Deactivate previous active file
const currentActive = this.openFiles.find((f) => f.isActive);
if (currentActive) {
currentActive.isActive = false;
currentActive.cursor = undefined;
currentActive.selectedText = undefined;
}
// Remove if it exists
const index = this.openFiles.findIndex(
(f) => f.path === editor.document.uri.fsPath,
);
if (index !== -1) {
this.openFiles.splice(index, 1);
}
// Add to the front as active
this.openFiles.unshift({
path: editor.document.uri.fsPath,
timestamp: Date.now(),
isActive: true,
});
// Enforce max length
if (this.openFiles.length > MAX_FILES) {
this.openFiles.pop();
}
this.updateActiveContext(editor);
}
private remove(uri: vscode.Uri) {
const index = this.openFiles.findIndex((f) => f.path === uri.fsPath);
if (index !== -1) {
this.openFiles.splice(index, 1);
}
}
private rename(oldUri: vscode.Uri, newUri: vscode.Uri) {
const index = this.openFiles.findIndex((f) => f.path === oldUri.fsPath);
if (index !== -1) {
this.openFiles[index].path = newUri.fsPath;
}
}
private updateActiveContext(editor: vscode.TextEditor) {
const file = this.openFiles.find(
(f) => f.path === editor.document.uri.fsPath,
);
if (!file || !file.isActive) {
return;
}
file.cursor = editor.selection.active
? {
line: editor.selection.active.line + 1,
character: editor.selection.active.character,
}
: undefined;
let selectedText: string | undefined =
editor.document.getText(editor.selection) || undefined;
if (selectedText && selectedText.length > MAX_SELECTED_TEXT_LENGTH) {
selectedText =
selectedText.substring(0, MAX_SELECTED_TEXT_LENGTH) + '... [TRUNCATED]';
}
file.selectedText = selectedText;
}
private fireWithDebounce() {
if (this.debounceTimer) {
clearTimeout(this.debounceTimer);
}
this.debounceTimer = setTimeout(() => {
this.onDidChangeEmitter.fire();
}, 50); // 50ms
}
get state(): IdeContext {
return {
workspaceState: {
openFiles: [...this.openFiles],
},
};
}
}
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