fix(tui): restore diff viewer route and workspace

packages/opencode/src/cli/cmd/tui/app.tsx

@@ -25,7 +25,7 @@ import { DialogProvider, useDialog } from "@tui/ui/dialog"
 import { DialogProvider as DialogProviderList } from "@tui/component/dialog-provider"
 import { ErrorComponent } from "@tui/component/error-component"
 import { PluginRouteMissing } from "@tui/component/plugin-route-missing"
-import { ProjectProvider } from "@tui/context/project"
+import { ProjectProvider, useProject } from "@tui/context/project"
 import { EditorContextProvider } from "@tui/context/editor"
 import { useEvent } from "@tui/context/event"
 import { SDKProvider, useSDK } from "@tui/context/sdk"
@@ -279,6 +279,7 @@ function App(props: { onSnapshot?: () => Promise<string[]> }) {
   const themeState = useTheme()
   const { theme, mode, setMode, locked, lock, unlock } = themeState
   const sync = useSync()
+  const project = useProject()
   const exit = useExit()
   const promptRef = usePromptRef()
   const routes: RouteMap = new Map()
@@ -304,6 +305,7 @@ function App(props: { onSnapshot?: () => Promise<string[]> }) {
     toast,
     renderer,
     attention,
+    project,
   })
   const [ready, setReady] = createSignal(false)
   TuiPluginRuntime.init({

packages/opencode/src/cli/cmd/tui/feature-plugins/system/diff-viewer.tsx

@@ -1,5 +1,5 @@
 /** @jsxImportSource @opentui/solid */
-import type { TuiPlugin, TuiPluginApi } from "@opencode-ai/plugin/tui"
+import type { TuiPlugin, TuiPluginApi, TuiRouteCurrent } from "@opencode-ai/plugin/tui"
 import type { SnapshotFileDiff, VcsFileDiff } from "@opencode-ai/sdk/v2"
 import type { BoxRenderable, ScrollBoxRenderable } from "@opentui/core"
 import { LANGUAGE_EXTENSIONS } from "@/lsp/language"
@@ -61,7 +61,7 @@ function DiffViewer(props: { api: TuiPluginApi }) {
   const theme = () => props.api.theme.current
   const params = () =>
     ("params" in props.api.route.current ? props.api.route.current.params : undefined) as
-      | { mode?: DiffMode; sessionID?: string; messageID?: string }
+      | { mode?: DiffMode; sessionID?: string; messageID?: string; returnTo?: TuiRouteCurrent }
       | undefined
   const mode = () => params()?.mode ?? "git"
   const diffInput = createMemo(() => ({
@@ -80,7 +80,10 @@ function DiffViewer(props: { api: TuiPluginApi }) {
       return normalizeDiffs(result.data ?? [])
     }
 
-    const result = await props.api.client.vcs.diff({ mode: "git" }, { throwOnError: true })
+    const result = await props.api.client.vcs.diff(
+      { mode: "git", workspace: props.api.workspace.current() },
+      { throwOnError: true },
+    )
     return normalizeDiffs(result.data ?? [])
   })
   const files = createMemo(() => diff() ?? [])
@@ -250,7 +253,8 @@ function DiffViewer(props: { api: TuiPluginApi }) {
       title: "Close diff viewer",
       category: "VCS",
       run() {
-        props.api.route.navigate("home")
+        const target = params()?.returnTo ?? ({ name: "home" } satisfies TuiRouteCurrent)
+        props.api.route.navigate(target.name, "params" in target ? target.params : undefined)
       },
     },
     {
@@ -446,6 +450,7 @@ function DiffViewer(props: { api: TuiPluginApi }) {
               mode: option.value,
               sessionID: params()?.sessionID,
               messageID: params()?.messageID,
+              returnTo: params()?.returnTo,
             })
           },
         }))}
@@ -672,6 +677,12 @@ const tui: TuiPlugin = async (api) => {
           api.route.navigate(ROUTE, {
             mode: "git",
             sessionID: "params" in api.route.current ? api.route.current.params?.sessionID : undefined,
+            returnTo: {
+              name: api.route.current.name,
+              ...("params" in api.route.current && api.route.current.params
+                ? { params: api.route.current.params }
+                : {}),
+            },
           })
           api.ui.dialog.clear()
         },

packages/opencode/src/cli/cmd/tui/plugin/api.tsx

@@ -8,6 +8,7 @@ import { Dialog as DialogUI, type useDialog } from "@tui/ui/dialog"
 import type { TuiConfig } from "@/cli/cmd/tui/config/tui"
 import type { useOpencodeKeymap } from "../keymap"
 import type { useKV } from "../context/kv"
+import type { useProject } from "../context/project"
 import { DialogAlert } from "../ui/dialog-alert"
 import { DialogConfirm } from "../ui/dialog-confirm"
 import { DialogPrompt } from "../ui/dialog-prompt"
@@ -41,6 +42,7 @@ type Input = {
   toast: ReturnType<typeof useToast>
   renderer: TuiPluginApi["renderer"]
   attention: TuiPluginApi["attention"]
+  project: ReturnType<typeof useProject>
 }
 
 function routeRegister(routes: RouteMap, list: TuiRouteDefinition[], bump: () => void) {
@@ -227,6 +229,11 @@ export function createTuiApi(input: Input): TuiPluginApi {
         return Keymap.getOpencodeModeStack(input.keymap).push(mode)
       },
     },
+    workspace: {
+      current() {
+        return input.project.workspace.current()
+      },
+    },
     route: {
       register(list) {
         return routeRegister(input.routes, list, input.bump)

packages/opencode/src/cli/cmd/tui/plugin/runtime.ts

@@ -628,6 +628,7 @@ function pluginApi(runtime: RuntimeState, plugin: PluginEntry, scope: PluginScop
     keys: api.keys,
     keymap,
     mode: createScopedMode(api.mode, scope),
+    workspace: api.workspace,
     route,
     ui: api.ui,
     tuiConfig: api.tuiConfig,

packages/opencode/test/fixture/tui-plugin.ts

@@ -242,6 +242,9 @@ export function createTuiPluginApi(opts: Opts = {}): HostPluginApi {
       current: () => "base",
       push: () => () => {},
     },
+    workspace: {
+      current: () => undefined,
+    },
     route: {
       register: () => {
         if (count) count.route_add += 1

packages/plugin/src/tui.ts

@@ -579,7 +579,6 @@ export type TuiPluginInstallResult =
 
 export type TuiWorkspace = {
   current: () => string | undefined
-  set: (workspaceID?: string) => void
 }
 
 export type TuiPluginApi = {
@@ -595,6 +594,7 @@ export type TuiPluginApi = {
   keys: TuiKeys
   keymap: TuiKeymap
   mode: TuiModeApi
+  workspace: TuiWorkspace
   route: {
     register: (routes: TuiRouteDefinition[]) => () => void
     navigate: (name: string, params?: Record<string, unknown>) => void