fix(tui): keep shell commands full width (#42339)

Co-authored-by: James Long <17031+jlongster@users.noreply.github.com>

packages/core/src/instruction-discovery.ts

@@ -2,6 +2,7 @@ export * as InstructionDiscovery from "./instruction-discovery.js"
 
 import { Context, Effect, Layer, Schema, Types } from "effect"
 import { makeLocationNode } from "@opencode-ai/util/effect/app-node"
+import { createPatch } from "diff"
 import { Bus } from "./bus.js"
 import { Instructions } from "./instructions/index.js"
 import { AbsolutePath } from "./schema.js"
@@ -81,8 +82,7 @@ export const layer = (options?: Options) =>
           read: Effect.succeed(value),
           render: {
             initial: render,
-            changed: (_previous, current) =>
-              `These instructions replace all previously loaded ambient instructions.\n\n${render(current)}`,
+            changed: renderUpdate,
             removed: () => "Previously loaded instructions no longer apply.",
           },
         })
@@ -120,3 +120,27 @@ export const node = configured()
 function render(files: ReadonlyArray<File>) {
   return files.map((file) => `Instructions from: ${file.path}\n${file.content}`).join("\n\n")
 }
+
+function renderUpdate(previous: ReadonlyArray<File>, current: ReadonlyArray<File>) {
+  const changes = Instructions.diffByKey(
+    previous,
+    current,
+    (file) => file.path,
+    (before, after) => before.content !== after.content,
+  )
+  return [
+    ...changes.removed.map((file) => `The instructions from ${file.path} no longer apply.`),
+    ...changes.added.map((file) => `New instructions apply from:\n${render([file])}`),
+    ...changes.changed.map(({ previous: before, current: after }) => {
+      const patch = createPatch(after.path, before.content, after.content, "", "", { context: 3 })
+      const diff = [
+        `The instructions from ${after.path} changed. Here's the diff:`,
+        "```diff",
+        patch.slice(patch.indexOf("@@")).trimEnd(),
+        "```",
+      ].join("\n")
+      const replacement = `The instructions changed:\n${render([after])}`
+      return diff.length < replacement.length ? diff : replacement
+    }),
+  ].join("\n\n")
+}

packages/core/test/instruction-discovery.test.ts

@@ -111,6 +111,50 @@ describe("InstructionDiscovery", () => {
       ).toBe(false)
     }).pipe(Effect.provide(AppNodeBuilder.build(LayerNode.group([InstructionDiscovery.node, Bus.node])))),
   )
+
+  it.effect("renders granular instruction updates", () =>
+    Effect.gen(function* () {
+      const discovery = yield* InstructionDiscovery.Service
+      yield* discovery.transform((draft) => {
+        draft.add(file("/global/AGENTS.md", "global"))
+        draft.add(
+          file("/repo/AGENTS.md", ["old", ...Array.from({ length: 20 }, (_, index) => `keep ${index}`)].join("\n")),
+        )
+      })
+      const initial = yield* readInitial(yield* discovery.load())
+
+      yield* discovery.transform((draft) => {
+        draft.update("/repo/AGENTS.md", (current) => {
+          current.content = ["new", ...Array.from({ length: 20 }, (_, index) => `keep ${index}`)].join("\n")
+        })
+      })
+      const modified = (yield* readUpdate(yield* discovery.load(), initial)).text
+      expect(modified).toContain("The instructions from /repo/AGENTS.md changed. Here's the diff:")
+      expect(modified).toContain("-old\n+new")
+      expect(modified).not.toContain("global")
+
+      const rewritten = state({
+        "core/instructions": [{ path: "/repo/AGENTS.md", content: "old one\nold two\nold three\nold four" }],
+      })
+      yield* discovery.transform((draft) => {
+        draft.remove("/global/AGENTS.md")
+        draft.update("/repo/AGENTS.md", (current) => {
+          current.content = "new"
+        })
+      })
+      expect((yield* readUpdate(yield* discovery.load(), rewritten)).text).toBe(
+        "The instructions changed:\nInstructions from: /repo/AGENTS.md\nnew",
+      )
+
+      yield* discovery.transform((draft) => {
+        draft.add(file("/repo/packages/AGENTS.md", "package"))
+      })
+      const structural = (yield* readUpdate(yield* discovery.load(), initial)).text
+      expect(structural).toContain("The instructions from /global/AGENTS.md no longer apply.")
+      expect(structural).toContain("New instructions apply from:\nInstructions from: /repo/packages/AGENTS.md\npackage")
+      expect(structural).not.toContain("Instructions from: /global/AGENTS.md\nglobal")
+    }).pipe(Effect.provide(AppNodeBuilder.build(LayerNode.group([InstructionDiscovery.node, Bus.node])))),
+  )
 })
 
 describe("ConfigInstructionPlugin.Plugin", () => {
@@ -168,20 +212,15 @@ describe("ConfigInstructionPlugin.Plugin", () => {
 
           yield* Effect.promise(() => fs.writeFile(packageFile, "changed"))
           yield* emitAndWait({ type: "update", path: packageFile })
-          expect((yield* readUpdate(yield* discovery.load(), initialized)).text).toContain(
-            `Instructions from: ${packageFile}\nchanged`,
-          )
+          const changed = (yield* readUpdate(yield* discovery.load(), initialized)).text
+          expect(changed).toContain(`The instructions changed:\nInstructions from: ${packageFile}\nchanged`)
+          expect(changed).not.toContain(`Instructions from: ${globalFile}\nglobal`)
 
           yield* Effect.promise(() => fs.rm(packageFile))
           yield* emitAndWait({ type: "delete", path: packageFile })
-          expect((yield* readUpdate(yield* discovery.load(), initialized)).text).toBe(
-            [
-              "These instructions replace all previously loaded ambient instructions.",
-              `Instructions from: ${globalFile}\nglobal`,
-              `Instructions from: ${projectFile}\nproject`,
-              `Instructions from: ${sharedFile}\nshared`,
-            ].join("\n\n"),
-          )
+          const removed = (yield* readUpdate(yield* discovery.load(), initialized)).text
+          expect(removed).toContain(`The instructions from ${packageFile} no longer apply.`)
+          expect(removed).not.toContain(`Instructions from: ${globalFile}\nglobal`)
 
           yield* Effect.promise(() => fs.rm(globalFile))
           yield* emitAndWait({ type: "delete", path: globalFile })

packages/tui/src/routes/session/composer/index.tsx

@@ -94,6 +94,7 @@ export function Composer(props: ComposerProps) {
   Keymap.createLayer(() => ({
     mode: "composer",
     enabled: () => props.open,
+    priority: 1,
     commands: [
       { bind: "left", title: "Previous tab", group: "Composer", run: () => switchTab(-1) },
       { bind: "right", title: "Next tab", group: "Composer", run: () => switchTab(1) },

packages/tui/src/routes/session/composer/shell-tab.tsx

@@ -50,6 +50,7 @@ export function ShellTab(props: { sessionID: string }) {
   Keymap.createLayer(() => ({
     mode: "composer",
     enabled: () => composer.active("shell"),
+    priority: 1,
     commands: [
       {
         id: "composer.shell.up",

packages/tui/src/routes/session/composer/subagents-tab.tsx

@@ -164,6 +164,7 @@ export function SubagentsTab(props: { sessionID: string }) {
   Keymap.createLayer(() => ({
     mode: "composer",
     enabled: () => composer.active("subagents"),
+    priority: 1,
     commands: [
       {
         id: "composer.subagent.up",

packages/tui/src/routes/session/index.tsx

@@ -2872,16 +2872,8 @@ function Shell(props: ToolProps) {
   })
   const maxLines = 10
   const maxChars = createMemo(() => maxLines * Math.max(20, ctx.width - 6))
-  const prompt = createMemo(() => (workdir() && workdir() !== "." ? `${workdir()}$` : "$"))
-  const input = createMemo(() => {
-    const cmd = command()
-    if (!cmd) return ""
-    // While running, the workdir prompt shares the spinner's text column; when
-    // settled, the prompt renders as its own column so wrapped command lines
-    // keep a stable hanging indent instead of jumping to the card inset.
-    if (isRunning() && prompt() !== "$") return `${prompt()} ${cmd}`
-    return cmd
-  })
+  const prefix = createMemo(() => (workdir() && workdir() !== "." ? `cd ${workdir()} && ` : ""))
+  const input = createMemo(() => (command() ? `${isRunning() ? "" : "$ "}${prefix()}${command()}` : ""))
   const content = createMemo(() => [input(), output()].filter(Boolean).join("\n\n"))
   const collapsed = createMemo(() => collapseToolOutput(content(), maxLines, maxChars()))
   const limited = createMemo(() => {
@@ -2910,15 +2902,7 @@ function Shell(props: ToolProps) {
             )
           }
         >
-          <Show
-            when={isRunning()}
-            fallback={
-              <box flexDirection="row" gap={1}>
-                <text fg={theme.text.default}>{prompt()}</text>
-                <text fg={theme.text.default}>{limitedInput()}</text>
-              </box>
-            }
-          >
+          <Show when={isRunning()} fallback={<text fg={theme.text.default}>{limitedInput()}</text>}>
             <Spinner color={color()}>{limitedInput()}</Spinner>
           </Show>
           <Show when={limitedOutput()}>

packages/tui/test/cli/tui/composer-keymap.test.tsx

@@ -23,7 +23,11 @@ const sessions = {
 
 const shells = [shell("sh-a", "bun test"), shell("sh-b", "bun dev")]
 
-async function renderComposer(defaultTab: "subagents" | "shell", keybinds: Partial<TuiKeybind.Keybinds>) {
+async function renderComposer(
+  defaultTab: "subagents" | "shell",
+  keybinds: Partial<TuiKeybind.Keybinds>,
+  focusedTextarea = false,
+) {
   const events = createEventStream()
   const interrupted: string[] = []
   const removed: string[] = []
@@ -69,7 +73,21 @@ async function renderComposer(defaultTab: "subagents" | "shell", keybinds: Parti
         .then(() => wait(() => data.session.status("child-a") === "running"))
         .then(() => ready.resolve(), ready.reject)
     })
-    return <Composer sessionID="parent" open={true} defaultTab={defaultTab} onClose={() => closed++} />
+    return (
+      <>
+        {focusedTextarea && <textarea focused={true} initialValue="draft" />}
+        <Composer sessionID="parent" open={true} defaultTab={defaultTab} onClose={() => closed++} />
+      </>
+    )
+  }
+
+  function AppExit() {
+    Keymap.createLayer(() => ({
+      mode: "global",
+      commands: [{ id: "app.exit", title: "Exit", group: "System", run: () => {} }],
+    }))
+    Keymap.createLayer(() => ({ bindings: ["app.exit"] }))
+    return null
   }
 
   const app = await testRender(
@@ -88,6 +106,7 @@ async function renderComposer(defaultTab: "subagents" | "shell", keybinds: Parti
                 </LocationProvider>
               </DataProvider>
             </ClientProvider>
+            <AppExit />
           </Keymap.Provider>
         </ConfigProvider>
       </TestTuiContexts>
@@ -154,6 +173,20 @@ test("disabled shell bindings have no component fallbacks", async () => {
   }
 })
 
+test("configured composer bindings work with a focused textarea", async () => {
+  const composer = await renderComposer("subagents", { "composer.shell.kill": "ctrl+u" }, true)
+  try {
+    composer.app.mockInput.pressArrow("right")
+    await composer.app.renderOnce()
+    expect(composer.app.captureCharFrame()).toContain("bun test")
+    composer.app.mockInput.pressKey("u", { ctrl: true })
+    await wait(() => composer.removed.length === 1)
+    expect(composer.removed).toEqual(["sh-a"])
+  } finally {
+    composer.app.renderer.destroy()
+  }
+})
+
 function session(id: string, title: string, parentID?: string) {
   return {
     id,