feat: implement stable project IDs (Sprint 1) - fixes #6618

Sprint 1 implementation includes:
- Added projectId utility module with getProjectId, generateProjectId, and getWorkspaceStorageKey functions
- Modified Task.ts to use project ID instead of workspace path for task metadata storage
- Added "Generate Project ID" command to VSCode extension
- Added comprehensive tests for projectId utility functions

This is the foundation for stable project IDs that will preserve chat history when projects are moved or renamed.

packages/types/src/vscode.ts

@@ -53,6 +53,8 @@ export const commandIds = [
 	"focusInput",
 	"acceptInput",
 	"focusPanel",
+
+	"generateProjectId",
 ] as const
 
 export type CommandId = (typeof commandIds)[number]

src/activate/registerCommands.ts

@@ -16,6 +16,8 @@ import { CodeIndexManager } from "../services/code-index/manager"
 import { importSettingsWithFeedback } from "../core/config/importExport"
 import { MdmService } from "../services/mdm/MdmService"
 import { t } from "../i18n"
+import { generateProjectId } from "../utils/projectId"
+import { getWorkspacePath } from "../utils/path"
 
 /**
  * Helper to get the visible ClineProvider instance or log if not found.
@@ -218,6 +220,30 @@ const getCommandsMap = ({ context, outputChannel, provider }: RegisterCommandOpt
 
 		visibleProvider.postMessageToWebview({ type: "acceptInput" })
 	},
+	generateProjectId: async () => {
+		const workspacePath = getWorkspacePath()
+		if (!workspacePath) {
+			vscode.window.showErrorMessage(t("common:errors.no_workspace"))
+			return
+		}
+
+		try {
+			const projectId = await generateProjectId(workspacePath)
+			vscode.window.showInformationMessage(t("common:info.project_id_generated", { projectId }))
+
+			// Notify the provider to update any cached state
+			const visibleProvider = getVisibleProviderOrLog(outputChannel)
+			if (visibleProvider) {
+				await visibleProvider.postStateToWebview()
+			}
+		} catch (error) {
+			vscode.window.showErrorMessage(
+				t("common:errors.project_id_generation_failed", {
+					error: error instanceof Error ? error.message : String(error),
+				}),
+			)
+		}
+	},
 })
 
 export const openClineInNewTab = async ({ context, outputChannel }: Omit<RegisterCommandOptions, "provider">) => {

src/core/task/Task.ts

@@ -67,6 +67,7 @@ import { TerminalRegistry } from "../../integrations/terminal/TerminalRegistry"
 // utils
 import { calculateApiCostAnthropic } from "../../shared/cost"
 import { getWorkspacePath } from "../../utils/path"
+import { getWorkspaceStorageKey } from "../../utils/projectId"
 
 // prompts
 import { formatResponse } from "../prompts/responses"
@@ -575,12 +576,15 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 				globalStoragePath: this.globalStoragePath,
 			})
 
+			// Use project ID if available, otherwise fall back to workspace path
+			const workspaceStorageKey = await getWorkspaceStorageKey(this.cwd)
+
 			const { historyItem, tokenUsage } = await taskMetadata({
 				messages: this.clineMessages,
 				taskId: this.taskId,
 				taskNumber: this.taskNumber,
 				globalStoragePath: this.globalStoragePath,
-				workspace: this.cwd,
+				workspace: workspaceStorageKey,
 				mode: this._taskMode || defaultModeSlug, // Use the task's own mode, not the current provider mode
 			})
 

src/package.json

@@ -165,6 +165,11 @@
 				"title": "%command.importSettings.title%",
 				"category": "%configuration.title%"
 			},
+			{
+				"command": "roo-cline.generateProjectId",
+				"title": "%command.generateProjectId.title%",
+				"category": "%configuration.title%"
+			},
 			{
 				"command": "roo-cline.focusInput",
 				"title": "%command.focusInput.title%",

src/package.nls.json

@@ -25,6 +25,7 @@
 	"command.terminal.fixCommand.title": "Fix This Command",
 	"command.terminal.explainCommand.title": "Explain This Command",
 	"command.acceptInput.title": "Accept Input/Suggestion",
+	"command.generateProjectId.title": "Generate Project ID",
 	"configuration.title": "Roo Code",
 	"commands.allowedCommands.description": "Commands that can be auto-executed when 'Always approve execute operations' is enabled",
 	"commands.deniedCommands.description": "Command prefixes that will be automatically denied without asking for approval. In case of conflicts with allowed commands, the longest prefix match takes precedence. Add * to deny all commands.",

src/utils/__tests__/projectId.test.ts

@@ -0,0 +1,112 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest"
+import * as fs from "fs/promises"
+import * as path from "path"
+import { getProjectId, generateProjectId, getWorkspaceStorageKey } from "../projectId"
+import { fileExistsAtPath } from "../fs"
+
+vi.mock("fs/promises")
+vi.mock("path")
+vi.mock("../fs")
+
+describe("projectId", () => {
+	const mockWorkspaceRoot = "/test/workspace"
+	const mockProjectIdPath = "/test/workspace/.rooprojectid"
+	const mockProjectId = "123e4567-e89b-12d3-a456-426614174000"
+
+	beforeEach(() => {
+		vi.clearAllMocks()
+		vi.mocked(path.join).mockImplementation((...args) => args.join("/"))
+	})
+
+	afterEach(() => {
+		vi.restoreAllMocks()
+	})
+
+	describe("getProjectId", () => {
+		it("should return existing project ID from file", async () => {
+			vi.mocked(fileExistsAtPath).mockResolvedValue(true)
+			vi.mocked(fs.readFile).mockResolvedValue(mockProjectId)
+
+			const result = await getProjectId(mockWorkspaceRoot)
+
+			expect(result).toBe(mockProjectId)
+			expect(fileExistsAtPath).toHaveBeenCalledWith(mockProjectIdPath)
+			expect(fs.readFile).toHaveBeenCalledWith(mockProjectIdPath, "utf8")
+		})
+
+		it("should return null if file does not exist", async () => {
+			vi.mocked(fileExistsAtPath).mockResolvedValue(false)
+
+			const result = await getProjectId(mockWorkspaceRoot)
+
+			expect(result).toBeNull()
+			expect(fs.readFile).not.toHaveBeenCalled()
+		})
+
+		it("should return null if file is empty", async () => {
+			vi.mocked(fileExistsAtPath).mockResolvedValue(true)
+			vi.mocked(fs.readFile).mockResolvedValue("")
+
+			const result = await getProjectId(mockWorkspaceRoot)
+
+			expect(result).toBeNull()
+		})
+
+		it("should trim whitespace from project ID", async () => {
+			vi.mocked(fileExistsAtPath).mockResolvedValue(true)
+			vi.mocked(fs.readFile).mockResolvedValue(`  ${mockProjectId}  \n`)
+
+			const result = await getProjectId(mockWorkspaceRoot)
+
+			expect(result).toBe(mockProjectId)
+		})
+
+		it("should return null on read error", async () => {
+			vi.mocked(fileExistsAtPath).mockResolvedValue(true)
+			vi.mocked(fs.readFile).mockRejectedValue(new Error("Read error"))
+			const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {})
+
+			const result = await getProjectId(mockWorkspaceRoot)
+
+			expect(result).toBeNull()
+			expect(consoleErrorSpy).toHaveBeenCalledWith("Failed to read project ID: Error: Read error")
+			consoleErrorSpy.mockRestore()
+		})
+	})
+
+	describe("generateProjectId", () => {
+		it("should generate and save a new project ID", async () => {
+			vi.mocked(fs.writeFile).mockResolvedValue()
+
+			const result = await generateProjectId(mockWorkspaceRoot)
+
+			expect(result).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i)
+			expect(fs.writeFile).toHaveBeenCalledWith(mockProjectIdPath, result, "utf8")
+		})
+
+		it("should throw error if write fails", async () => {
+			vi.mocked(fs.writeFile).mockRejectedValue(new Error("Write failed"))
+
+			await expect(generateProjectId(mockWorkspaceRoot)).rejects.toThrow("Write failed")
+		})
+	})
+
+	describe("getWorkspaceStorageKey", () => {
+		it("should return project ID if it exists", async () => {
+			vi.mocked(fileExistsAtPath).mockResolvedValue(true)
+			vi.mocked(fs.readFile).mockResolvedValue(mockProjectId)
+
+			const result = await getWorkspaceStorageKey(mockWorkspaceRoot)
+
+			expect(result).toBe(mockProjectId)
+		})
+
+		it("should return workspace root if project ID does not exist", async () => {
+			vi.mocked(fileExistsAtPath).mockResolvedValue(false)
+
+			const result = await getWorkspaceStorageKey(mockWorkspaceRoot)
+
+			expect(result).toBe(mockWorkspaceRoot)
+		})
+	})
+})

src/utils/projectId.ts

@@ -0,0 +1,64 @@
+import * as fs from "fs/promises"
+import * as path from "path"
+import { v4 as uuidv4 } from "uuid"
+import { fileExistsAtPath } from "./fs"
+
+const PROJECT_ID_FILENAME = ".rooprojectid"
+
+/**
+ * Gets the project ID from the .rooprojectid file in the workspace root.
+ * Returns null if the file doesn't exist or can't be read.
+ *
+ * @param workspaceRoot The root directory of the workspace
+ * @returns The project ID string or null
+ */
+export async function getProjectId(workspaceRoot: string): Promise<string | null> {
+	try {
+		const projectIdPath = path.join(workspaceRoot, PROJECT_ID_FILENAME)
+
+		if (!(await fileExistsAtPath(projectIdPath))) {
+			return null
+		}
+
+		const content = await fs.readFile(projectIdPath, "utf8")
+		const projectId = content.trim()
+
+		// Validate that it's a non-empty string
+		if (!projectId) {
+			return null
+		}
+
+		return projectId
+	} catch (error) {
+		// Silently handle errors and return null
+		console.error(`Failed to read project ID: ${error}`)
+		return null
+	}
+}
+
+/**
+ * Generates a new project ID and writes it to the .rooprojectid file.
+ *
+ * @param workspaceRoot The root directory of the workspace
+ * @returns The generated project ID
+ */
+export async function generateProjectId(workspaceRoot: string): Promise<string> {
+	const projectId = uuidv4()
+	const projectIdPath = path.join(workspaceRoot, PROJECT_ID_FILENAME)
+
+	await fs.writeFile(projectIdPath, projectId, "utf8")
+
+	return projectId
+}
+
+/**
+ * Gets the storage key for a workspace, using the project ID if available,
+ * otherwise falling back to the workspace path.
+ *
+ * @param workspaceRoot The root directory of the workspace
+ * @returns The storage key to use for this workspace
+ */
+export async function getWorkspaceStorageKey(workspaceRoot: string): Promise<string> {
+	const projectId = await getProjectId(workspaceRoot)
+	return projectId ?? workspaceRoot
+}