feat(ui): add /copy command to paste the last response cleanly (#127)

packages/cli/src/tests/clipboard.test.ts

@@ -3,6 +3,7 @@ import assert from "node:assert/strict";
 import * as fs from "fs";
 import * as os from "os";
 import * as path from "path";
+import { cleanOutputForClipboard } from "../ui/core/clipboard";
 
 // eslint-disable-next-line @typescript-eslint/consistent-type-imports
 type ClipboardModule = typeof import("../ui/core/clipboard");
@@ -77,3 +78,9 @@ test(
     }
   }
 );
+
+test("cleanOutputForClipboard strips ANSI codes and normalizes line endings", () => {
+  assert.equal(cleanOutputForClipboard("\u001B[32mhello\u001B[39m\r\nworld\r\n"), "hello\nworld\n");
+  assert.equal(cleanOutputForClipboard("  code\n"), "  code\n");
+  assert.equal(cleanOutputForClipboard(""), "\n");
+});

packages/cli/src/tests/slash-commands.test.ts

@@ -31,6 +31,7 @@ test("buildSlashCommands prefixes skills before built-ins", () => {
     "undo",
     "mcp",
     "raw",
+    "copy",
     "exit",
   ]);
 });

packages/cli/src/ui/core/clipboard.ts

@@ -156,3 +156,47 @@ export async function readClipboardImageAsync(): Promise<ClipboardImage | null>
     });
   });
 }
+
+const ANSI_ESCAPE_REGEX = /\u001B\[[0-9;]*m/g;
+
+/**
+ * Prepare assistant output for clean clipboard pasting: strip ANSI escape
+ * codes and normalize line endings so the copied text pastes without terminal
+ * color codes. (#127)
+ */
+export function cleanOutputForClipboard(text: string): string {
+  const withoutAnsi = text.replace(ANSI_ESCAPE_REGEX, "");
+  return withoutAnsi.replace(/\r\n/g, "\n").replace(/\r/g, "\n").trimEnd() + "\n";
+}
+
+function tryRunWithInput(command: string, args: string[], input: string): boolean {
+  try {
+    const result = spawnSync(command, args, { input, encoding: "utf8", maxBuffer: 32 * 1024 * 1024 });
+    return result.status === 0 && !result.error;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Copy plain text to the system clipboard using the platform-native helper.
+ * Returns false when no clipboard tool is available. (#127)
+ */
+export function writeClipboardText(text: string): boolean {
+  if (!text) {
+    return false;
+  }
+  if (process.platform === "darwin") {
+    return tryRunWithInput("pbcopy", [], text);
+  }
+  if (process.platform === "linux") {
+    if (tryRunWithInput("xclip", ["-selection", "clipboard"], text)) {
+      return true;
+    }
+    return tryRunWithInput("wl-copy", [], text);
+  }
+  if (process.platform === "win32") {
+    return tryRunWithInput("powershell", ["-NoProfile", "-Command", "[Console]::In.ReadToEnd() | Set-Clipboard"], text);
+  }
+  return false;
+}

packages/cli/src/ui/core/slash-commands.ts

@@ -13,6 +13,7 @@ export type SlashCommandKind =
   | "undo"
   | "mcp"
   | "raw"
+  | "copy"
   | "exit";
 
 export type SlashCommandItem = {
@@ -92,6 +93,12 @@ export const BUILTIN_SLASH_COMMANDS: SlashCommandItem[] = [
     args: ["lite", "normal", "raw-scrollback"],
     description: "Toggle display mode for viewing or collapsing reasoning content",
   },
+  {
+    kind: "copy",
+    name: "copy",
+    label: "/copy",
+    description: "Copy the last assistant response to the clipboard",
+  },
   {
     kind: "exit",
     name: "exit",

packages/cli/src/ui/views/App.tsx

@@ -9,6 +9,7 @@ import { MessageView, RawModeExitPrompt } from "../components";
 import { SessionList } from "./SessionList";
 import { type UndoRestoreMode, UndoSelector } from "./UndoSelector";
 import { buildLoadingText } from "../core/loading-text";
+import { cleanOutputForClipboard, writeClipboardText } from "../core/clipboard";
 import { findExpandedThinkingId } from "../core/thinking-state";
 import { WelcomeScreen } from "./WelcomeScreen";
 import { AskUserQuestionPrompt } from "./AskUserQuestionPrompt";
@@ -392,6 +393,22 @@ function App({ projectRoot, initialPrompt, resumeSessionId, forkSessionId, onRes
         navigateToSubView("mcp-status");
         return;
       }
+      if (submission.command === "copy") {
+        const activeSessionId = sessionManager.getActiveSessionId();
+        const sessionMessages = activeSessionId ? sessionManager.listSessionMessages(activeSessionId) : [];
+        const lastAssistant = [...sessionMessages].reverse().find((msg) => msg.role === "assistant");
+        const content = typeof lastAssistant?.content === "string" ? lastAssistant.content : "";
+        if (!content.trim()) {
+          setErrorLine("No assistant response to copy yet.");
+          return;
+        }
+        if (writeClipboardText(cleanOutputForClipboard(content))) {
+          setMessages((prev) => [...prev, buildSyntheticUserMessage("Copied last response to clipboard", 0)]);
+        } else {
+          setErrorLine("Failed to copy: no clipboard tool available.");
+        }
+        return;
+      }
 
       const prompt: UserPromptContent = {
         text: submission.text,

packages/cli/src/ui/views/PromptInput.tsx

@@ -73,7 +73,7 @@ export type PromptSubmission = {
   permissions?: UserToolPermission[];
   alwaysAllows?: PermissionScope[];
   planMode?: boolean;
-  command?: "new" | "resume" | "fork" | "continue" | "undo" | "mcp" | "exit";
+  command?: "new" | "resume" | "fork" | "continue" | "undo" | "mcp" | "copy" | "exit";
 };
 
 export type PromptDraft = {
@@ -734,6 +734,11 @@ export const PromptInput = React.memo(function PromptInput({
       resetPromptInput();
       return;
     }
+    if (item.kind === "copy") {
+      onSubmit({ text: "/copy", imageUrls: [], command: "copy" });
+      resetPromptInput();
+      return;
+    }
     if (item.kind === "exit") {
       onSubmit({ text: "/exit", imageUrls: [], command: "exit" });
       setBuffer(EMPTY_BUFFER);