Use workspace folders as cwd for remote notebooks

package.json

@@ -1233,6 +1233,10 @@
       {
         "view": "runme.launcher",
         "contents": "Open a workspace/folder to display Runme files here"
+      },
+      {
+        "view": "runme.remoteNotebooks",
+        "contents": "Explore Cloud Notebooks"
       }
     ],
     "keybindings": [

src/extension/executors/utils.ts

@@ -1,5 +1,6 @@
 import path from 'node:path'
 import fs from 'node:fs/promises'
+import os from 'node:os'
 
 import {
   NotebookCellOutput,
@@ -10,13 +11,16 @@ import {
   NotebookCellData,
   Uri,
   NotebookDocument,
+  workspace,
+  WorkspaceFolder,
 } from 'vscode'
 
 import { DEFAULT_PROMPT_ENV, OutputType, RUNME_FRONTMATTER_PARSED } from '../../constants'
 import type { CellOutputPayload, Serializer, ShellType } from '../../types'
 import { NotebookCellOutputManager } from '../cell'
 import { getAnnotations, getWorkspaceFolder } from '../utils'
 import { CommandMode, CommandModeEnum } from '../grpc/runner/types'
+import { RunmeFsScheme } from '../provider/runmeFs'
 
 const HASH_PREFIX_REGEXP = /^\s*\#\s*/g
 const ENV_VAR_REGEXP = /(\$\w+)/g
@@ -240,7 +244,17 @@ export async function getCellCwd(
     // TODO: support windows here
     (notebook?.metadata as Serializer.Metadata | undefined)?.[RUNME_FRONTMATTER_PARSED]?.cwd,
     getAnnotations(cell.metadata as Serializer.Metadata | undefined).cwd,
-  ]
+  ].filter(Boolean)
+
+  if (notebook && 'uri' in notebook && notebook.uri.scheme === RunmeFsScheme) {
+    const folders: readonly WorkspaceFolder[] = workspace.workspaceFolders || []
+    if (folders.length > 0) {
+      candidates.push(...folders.map((f) => f.uri.fsPath))
+    } else {
+      const fallbackCwd = await fs.mkdtemp(path.join(os.tmpdir(), 'runme-fallback-cwd-'))
+      candidates.push(fallbackCwd)
+    }
+  }
 
   for (let candidate of candidates) {
     if (!candidate) {

src/extension/extension.ts

@@ -92,7 +92,7 @@ import { RunmeIdentity } from './grpc/parser/tcp/types'
 import * as features from './features'
 import AuthSessionChangeHandler from './authSessionChangeHandler'
 import { CloudNotebooks } from './provider/cloudNotebooks'
-import RunmeFS from './provider/runmeFs'
+import RunmeFS, { RunmeFsScheme } from './provider/runmeFs'
 
 export class RunmeExtension {
   protected serializer?: ISerializer
@@ -107,7 +107,7 @@ export class RunmeExtension {
       await ContextState.addKey(FeatureName.RemoteNotebooks, true)
       const runmeFs = new RunmeFS()
       context.subscriptions.push(
-        workspace.registerFileSystemProvider('runmefs', runmeFs, {
+        workspace.registerFileSystemProvider(RunmeFsScheme, runmeFs, {
           isReadonly: false,
         }),
         commands.registerCommand('runme.addRemoteNotebooks', (_) => {

src/extension/provider/runmeFs.ts

@@ -30,6 +30,8 @@ const excludedPaths = [
   '.runme_bootstrap_demo',
 ]
 
+export const RunmeFsScheme = 'runmefs'
+
 export function mergeUriPaths(uri: Uri, newPath: string): Uri {
   const isAbsolutePath = newPath.startsWith('/')
 
@@ -54,11 +56,11 @@ export default class RunmeFS implements FileSystemProvider {
   #pathTree: PathTree = {}
 
   get root() {
-    return Uri.parse('runmefs:///')
+    return Uri.parse(`${RunmeFsScheme}:///`)
   }
 
   static resolveUri(path: string) {
-    return Uri.parse(`runmefs:///${path}`)
+    return Uri.parse(`${RunmeFsScheme}:///${path}`)
   }
 
   async readFile(uri: Uri): Promise<Uint8Array> {