feat: add "View Diff" button to task actions

webview-ui/src/components/chat/TaskActions.tsx

@@ -1,4 +1,4 @@
-import { useState } from "react"
+import { useState, useMemo, useCallback } from "react"
 import { useTranslation } from "react-i18next"
 
 import type { HistoryItem } from "@roo-code/types"
@@ -9,7 +9,15 @@ import { useExtensionState } from "@/context/ExtensionStateContext"
 
 import { DeleteTaskDialog } from "../history/DeleteTaskDialog"
 import { ShareButton } from "./ShareButton"
-import { CopyIcon, CheckIcon, DownloadIcon, Trash2Icon, FileJsonIcon, MessageSquareCodeIcon } from "lucide-react"
+import {
+	CopyIcon,
+	CheckIcon,
+	DownloadIcon,
+	Trash2Icon,
+	FileJsonIcon,
+	MessageSquareCodeIcon,
+	DiffIcon,
+} from "lucide-react"
 import { LucideIconButton } from "./LucideIconButton"
 
 interface TaskActionsProps {
@@ -21,7 +29,26 @@ export const TaskActions = ({ item, buttonsDisabled }: TaskActionsProps) => {
 	const [deleteTaskId, setDeleteTaskId] = useState<string | null>(null)
 	const { t } = useTranslation()
 	const { copyWithFeedback, showCopyFeedback } = useCopyToClipboard()
-	const { debug } = useExtensionState()
+	const { debug, enableCheckpoints, clineMessages } = useExtensionState()
+
+	const firstCheckpointHash = useMemo(() => {
+		const msg = (clineMessages ?? []).find((m) => m.say === "checkpoint_saved")
+		return msg?.text
+	}, [clineMessages])
+
+	const lastCheckpointHash = useMemo(() => {
+		const checkpointMessages = (clineMessages ?? []).filter((m) => m.say === "checkpoint_saved")
+		return checkpointMessages.length > 0 ? checkpointMessages[checkpointMessages.length - 1].text : undefined
+	}, [clineMessages])
+
+	const onViewFullDiff = useCallback(() => {
+		if (lastCheckpointHash) {
+			vscode.postMessage({
+				type: "checkpointDiff",
+				payload: { commitHash: lastCheckpointHash, mode: "full" },
+			})
+		}
+	}, [lastCheckpointHash])
 
 	return (
 		<div className="flex flex-row items-center -ml-0.5 mt-1 gap-1">
@@ -31,6 +58,10 @@ export const TaskActions = ({ item, buttonsDisabled }: TaskActionsProps) => {
 				onClick={() => vscode.postMessage({ type: "exportCurrentTask" })}
 			/>
 
+			{enableCheckpoints && firstCheckpointHash && (
+				<LucideIconButton icon={DiffIcon} title={t("chat:task.viewDiff")} onClick={onViewFullDiff} />
+			)}
+
 			{item?.task && (
 				<LucideIconButton
 					icon={showCopyFeedback ? CheckIcon : CopyIcon}

webview-ui/src/components/chat/__tests__/TaskActions.spec.tsx

@@ -51,6 +51,7 @@ vi.mock("react-i18next", () => ({
 				"chat:task.sharingDisabledByOrganization": "Sharing disabled by organization",
 				"chat:task.openApiHistory": "Open API History",
 				"chat:task.openUiHistory": "Open UI History",
+				"chat:task.viewDiff": "View all changes since task started",
 				"cloud:cloudBenefitsTitle": "Connect to Roo Code Cloud",
 				"cloud:cloudBenefitHistory": "Access your task history from anywhere",
 				"cloud:cloudBenefitSharing": "Share tasks with your team",
@@ -525,4 +526,75 @@ describe("TaskActions", () => {
 			})
 		})
 	})
+
+	describe("View Diff Button", () => {
+		it("renders view diff button when checkpoints are enabled and checkpoint exists", () => {
+			mockUseExtensionState.mockReturnValue({
+				sharingEnabled: true,
+				cloudIsAuthenticated: true,
+				cloudUserInfo: { organizationName: "Test Organization" },
+				enableCheckpoints: true,
+				clineMessages: [{ say: "checkpoint_saved", text: "abc123", ts: 1000 }],
+			} as any)
+
+			render(<TaskActions item={mockItem} buttonsDisabled={false} />)
+
+			const viewDiffButton = screen.getByLabelText("View all changes since task started")
+			expect(viewDiffButton).toBeInTheDocument()
+		})
+
+		it("does not render view diff button when checkpoints are disabled", () => {
+			mockUseExtensionState.mockReturnValue({
+				sharingEnabled: true,
+				cloudIsAuthenticated: true,
+				cloudUserInfo: { organizationName: "Test Organization" },
+				enableCheckpoints: false,
+				clineMessages: [{ say: "checkpoint_saved", text: "abc123", ts: 1000 }],
+			} as any)
+
+			render(<TaskActions item={mockItem} buttonsDisabled={false} />)
+
+			const viewDiffButton = screen.queryByLabelText("View all changes since task started")
+			expect(viewDiffButton).toBeNull()
+		})
+
+		it("does not render view diff button when no checkpoints exist", () => {
+			mockUseExtensionState.mockReturnValue({
+				sharingEnabled: true,
+				cloudIsAuthenticated: true,
+				cloudUserInfo: { organizationName: "Test Organization" },
+				enableCheckpoints: true,
+				clineMessages: [],
+			} as any)
+
+			render(<TaskActions item={mockItem} buttonsDisabled={false} />)
+
+			const viewDiffButton = screen.queryByLabelText("View all changes since task started")
+			expect(viewDiffButton).toBeNull()
+		})
+
+		it("sends checkpointDiff message with full mode when view diff button is clicked", () => {
+			mockUseExtensionState.mockReturnValue({
+				sharingEnabled: true,
+				cloudIsAuthenticated: true,
+				cloudUserInfo: { organizationName: "Test Organization" },
+				enableCheckpoints: true,
+				clineMessages: [
+					{ say: "checkpoint_saved", text: "first-hash", ts: 1000 },
+					{ say: "text", text: "some message", ts: 2000 },
+					{ say: "checkpoint_saved", text: "last-hash", ts: 3000 },
+				],
+			} as any)
+
+			render(<TaskActions item={mockItem} buttonsDisabled={false} />)
+
+			const viewDiffButton = screen.getByLabelText("View all changes since task started")
+			fireEvent.click(viewDiffButton)
+
+			expect(mockPostMessage).toHaveBeenCalledWith({
+				type: "checkpointDiff",
+				payload: { commitHash: "last-hash", mode: "full" },
+			})
+		})
+	})
 })

webview-ui/src/i18n/locales/en/chat.json

@@ -27,6 +27,7 @@
 		"shareSuccessPublic": "Public link copied to clipboard",
 		"openApiHistory": "Open API History",
 		"openUiHistory": "Open UI History",
+		"viewDiff": "View all changes since task started",
 		"backToParentTask": "Parent task"
 	},
 	"unpin": "Unpin",