feat: Expose the environment <-> project mapping to agents.

src/kernels/deepnote/environments/deepnoteExtensionSidecarWriter.node.ts

@@ -0,0 +1,357 @@
+import { inject, injectable } from 'inversify';
+import * as yaml from 'js-yaml';
+import { env, NotebookDocument, Uri, workspace } from 'vscode';
+
+import { IExtensionSyncActivationService } from '../../../platform/activation/types';
+import { IDisposableRegistry } from '../../../platform/common/types';
+import { logger } from '../../../platform/logging';
+import { IDeepnoteEnvironmentManager, IDeepnoteNotebookEnvironmentMapper } from '../types';
+
+const SIDECAR_FILENAME = 'deepnote.json';
+
+/**
+ * Returns the editor-specific settings folder name based on the current app.
+ * - VS Code → `.vscode`
+ * - Cursor  → `.cursor`
+ * - Antigravity → `.antigravity`
+ * - Unknown → `.vscode` (safe default)
+ */
+function getEditorSettingsFolder(): string {
+    const appName = env.appName.toLowerCase();
+    if (appName.includes('cursor')) {
+        return '.cursor';
+    }
+    if (appName.includes('antigravity')) {
+        return '.antigravity';
+    }
+    return '.vscode';
+}
+
+interface SidecarEntry {
+    environmentId: string;
+    venvPath: string;
+    pythonInterpreter: string;
+}
+
+interface SidecarFile {
+    mappings: Record<string, SidecarEntry>;
+}
+
+/**
+ * Writes a `deepnote.json` sidecar file in the editor settings
+ * folder (e.g. `.vscode/`, `.cursor/`, `.antigravity/`) so that external
+ * tools (e.g. the Deepnote CLI) can discover the selected venv path for
+ * each project without reading VS Code workspace state.
+ */
+@injectable()
+export class DeepnoteExtensionSidecarWriter implements IExtensionSyncActivationService {
+    /** Reverse map: notebookUri.fsPath → projectId (populated from sidecar + set calls). */
+    private readonly fsPathToProjectId = new Map<string, string>();
+    /** Serializes sidecar writes to avoid read-modify-write races. */
+    private writeQueue: Promise<void> = Promise.resolve();
+
+    constructor(
+        @inject(IDeepnoteNotebookEnvironmentMapper) private readonly mapper: IDeepnoteNotebookEnvironmentMapper,
+        @inject(IDeepnoteEnvironmentManager) private readonly environmentManager: IDeepnoteEnvironmentManager,
+        @inject(IDisposableRegistry) private readonly disposables: IDisposableRegistry
+    ) {}
+
+    public activate(): void {
+        this.disposables.push(
+            this.mapper.onDidSetEnvironment((e) => this.handleSetEnvironment(e)),
+            this.mapper.onDidRemoveEnvironment((e) => this.handleRemoveEnvironment(e)),
+            this.environmentManager.onDidChangeEnvironments(() => this.handleEnvironmentsChanged()),
+            workspace.onDidOpenNotebookDocument((doc) => this.handleNotebookOpened(doc))
+        );
+
+        // Sync existing mappings so the sidecar is up-to-date for existing users
+        // who already have workspace-state mappings but no sidecar file yet.
+        void this.syncExistingMappings();
+    }
+
+    private async handleEnvironmentsChanged(): Promise<void> {
+        try {
+            await this.enqueueWrite(async (sidecar) => {
+                if (Object.keys(sidecar.mappings).length === 0) {
+                    return false;
+                }
+
+                let changed = false;
+                for (const [projectId, entry] of Object.entries(sidecar.mappings)) {
+                    try {
+                        const environment = this.environmentManager.getEnvironment(entry.environmentId);
+                        if (!environment) {
+                            delete sidecar.mappings[projectId];
+                            changed = true;
+                        } else if (
+                            environment.venvPath.fsPath !== entry.venvPath ||
+                            environment.pythonInterpreter.uri.fsPath !== entry.pythonInterpreter
+                        ) {
+                            sidecar.mappings[projectId] = {
+                                environmentId: entry.environmentId,
+                                venvPath: environment.venvPath.fsPath,
+                                pythonInterpreter: environment.pythonInterpreter.uri.fsPath
+                            };
+                            changed = true;
+                        }
+                    } catch (entryError) {
+                        logger.warn(`[SidecarWriter] Failed to process mapping for project ${projectId}`, entryError);
+                    }
+                }
+
+                return changed;
+            });
+        } catch (error) {
+            logger.warn('[SidecarWriter] Failed to handle environments changed', error);
+        }
+    }
+
+    /**
+     * When a notebook is opened after activation, check if it already has
+     * a mapping and add it to the sidecar.
+     */
+    private async handleNotebookOpened(doc: NotebookDocument): Promise<void> {
+        if (doc.notebookType !== 'deepnote') {
+            return;
+        }
+
+        try {
+            const notebookUri = doc.uri.with({ query: '', fragment: '' });
+            const projectId = doc.metadata?.deepnoteProjectId as string | undefined;
+            if (!projectId) {
+                return;
+            }
+
+            const environmentId = this.mapper.getEnvironmentForNotebook(notebookUri);
+            if (!environmentId) {
+                return;
+            }
+
+            const environment = this.environmentManager.getEnvironment(environmentId);
+            if (!environment) {
+                return;
+            }
+
+            this.fsPathToProjectId.set(notebookUri.fsPath, projectId);
+
+            await this.enqueueWrite(async (sidecar) => {
+                const existing = sidecar.mappings[projectId];
+                if (
+                    existing?.environmentId === environmentId &&
+                    existing?.venvPath === environment.venvPath.fsPath &&
+                    existing?.pythonInterpreter === environment.pythonInterpreter.uri.fsPath
+                ) {
+                    return false;
+                }
+                sidecar.mappings[projectId] = {
+                    environmentId,
+                    venvPath: environment.venvPath.fsPath,
+                    pythonInterpreter: environment.pythonInterpreter.uri.fsPath
+                };
+                return true;
+            });
+        } catch (error) {
+            logger.warn('[SidecarWriter] Failed to handle notebook opened', error);
+        }
+    }
+
+    private async handleRemoveEnvironment({ notebookUri }: { notebookUri: Uri }): Promise<void> {
+        try {
+            const projectId = this.fsPathToProjectId.get(notebookUri.fsPath) ?? this.resolveProjectId(notebookUri);
+            if (!projectId) {
+                return;
+            }
+
+            this.fsPathToProjectId.delete(notebookUri.fsPath);
+
+            await this.enqueueWrite(async (sidecar) => {
+                if (!(projectId in sidecar.mappings)) {
+                    return false;
+                }
+                delete sidecar.mappings[projectId];
+                return true;
+            });
+        } catch (error) {
+            logger.warn('[SidecarWriter] Failed to handle remove environment', error);
+        }
+    }
+
+    private async handleSetEnvironment({
+        notebookUri,
+        environmentId
+    }: {
+        notebookUri: Uri;
+        environmentId: string;
+    }): Promise<void> {
+        try {
+            const projectId = this.resolveProjectId(notebookUri);
+            if (!projectId) {
+                return;
+            }
+
+            const environment = this.environmentManager.getEnvironment(environmentId);
+            if (!environment) {
+                return;
+            }
+
+            this.fsPathToProjectId.set(notebookUri.fsPath, projectId);
+
+            await this.enqueueWrite(async (sidecar) => {
+                sidecar.mappings[projectId] = {
+                    environmentId,
+                    venvPath: environment.venvPath.fsPath,
+                    pythonInterpreter: environment.pythonInterpreter.uri.fsPath
+                };
+                return true;
+            });
+        } catch (error) {
+            logger.warn('[SidecarWriter] Failed to handle set environment', error);
+        }
+    }
+
+    /**
+     * On activation, iterate all persisted mapper entries (not just open
+     * notebooks) and write their mappings to the sidecar. For each entry
+     * we read the `.deepnote` file to extract the project ID.
+     */
+    private async syncExistingMappings(): Promise<void> {
+        try {
+            await this.environmentManager.waitForInitialization();
+
+            const allMappings = this.mapper.getAllMappings();
+            if (allMappings.size === 0) {
+                return;
+            }
+
+            // Collect all project IDs outside the write queue to avoid holding the lock during I/O.
+            const entries: Array<{
+                fsPath: string;
+                projectId: string;
+                environmentId: string;
+                venvPath: string;
+                pythonInterpreter: string;
+            }> = [];
+            for (const [fsPath, environmentId] of allMappings) {
+                try {
+                    const environment = this.environmentManager.getEnvironment(environmentId);
+                    if (!environment) {
+                        continue;
+                    }
+
+                    const projectId = await this.readProjectIdFromFile(Uri.file(fsPath));
+                    if (!projectId) {
+                        continue;
+                    }
+
+                    this.fsPathToProjectId.set(fsPath, projectId);
+                    entries.push({
+                        fsPath,
+                        projectId,
+                        environmentId,
+                        venvPath: environment.venvPath.fsPath,
+                        pythonInterpreter: environment.pythonInterpreter.uri.fsPath
+                    });
+                } catch (entryError) {
+                    logger.warn(`[SidecarWriter] Failed to process mapping for ${fsPath}`, entryError);
+                }
+            }
+
+            if (entries.length === 0) {
+                return;
+            }
+
+            await this.enqueueWrite(async (sidecar) => {
+                for (const entry of entries) {
+                    sidecar.mappings[entry.projectId] = {
+                        environmentId: entry.environmentId,
+                        venvPath: entry.venvPath,
+                        pythonInterpreter: entry.pythonInterpreter
+                    };
+                }
+                return true;
+            });
+        } catch (error) {
+            logger.warn('[SidecarWriter] Failed to sync existing mappings', error);
+        }
+    }
+
+    // ── Helpers ──────────────────────────────────────────────────────────
+
+    /**
+     * Serializes all sidecar mutations through a queue so that concurrent
+     * read-modify-write cycles don't clobber each other. The `mutate` callback
+     * receives the current sidecar contents and returns `true` if it modified
+     * the object (i.e. should be written back).
+     */
+    private enqueueWrite(mutate: (sidecar: SidecarFile) => Promise<boolean>): Promise<void> {
+        const op = this.writeQueue.then(async () => {
+            const sidecar = await this.readSidecar();
+            const changed = await mutate(sidecar);
+            if (changed) {
+                await this.writeSidecar(sidecar);
+            }
+        });
+        // eslint-disable-next-line @typescript-eslint/no-empty-function -- keep queue chain alive after rejection
+        this.writeQueue = op.catch(() => {});
+        return op;
+    }
+
+    private getSidecarUri(): Uri | undefined {
+        const folder = workspace.workspaceFolders?.[0];
+        if (!folder) {
+            return undefined;
+        }
+        return Uri.joinPath(folder.uri, getEditorSettingsFolder(), SIDECAR_FILENAME);
+    }
+
+    private async readProjectIdFromFile(fileUri: Uri): Promise<string | undefined> {
+        try {
+            const raw = await workspace.fs.readFile(fileUri);
+            const parsed = yaml.load(Buffer.from(raw).toString('utf-8')) as { project?: { id?: string } } | undefined;
+            return parsed?.project?.id;
+        } catch {
+            return undefined;
+        }
+    }
+
+    private async readSidecar(): Promise<SidecarFile> {
+        const uri = this.getSidecarUri();
+        if (!uri) {
+            return { mappings: {} };
+        }
+
+        try {
+            const raw = await workspace.fs.readFile(uri);
+            const parsed = JSON.parse(Buffer.from(raw).toString('utf-8')) as SidecarFile;
+            if (parsed?.mappings && typeof parsed.mappings === 'object') {
+                return parsed;
+            }
+        } catch {
+            // File doesn't exist or is invalid — start fresh.
+        }
+
+        return { mappings: {} };
+    }
+
+    private resolveProjectId(notebookUri: Uri): string | undefined {
+        const doc = workspace.notebookDocuments.find(
+            (d) =>
+                d.notebookType === 'deepnote' && d.uri.with({ query: '', fragment: '' }).fsPath === notebookUri.fsPath
+        );
+        return doc?.metadata?.deepnoteProjectId as string | undefined;
+    }
+
+    private async writeSidecar(sidecar: SidecarFile): Promise<void> {
+        const uri = this.getSidecarUri();
+        if (!uri) {
+            return;
+        }
+
+        // Ensure the editor settings folder exists (e.g. .vscode/).
+        const folderUri = Uri.joinPath(uri, '..');
+        await workspace.fs.createDirectory(folderUri);
+
+        const content = JSON.stringify(sidecar, undefined, 2) + '\n';
+        await workspace.fs.writeFile(uri, Buffer.from(content, 'utf-8'));
+    }
+}