fix: add support for fileOpener in config.json (#911)

This PR introduces the following type:

```typescript
export type FileOpenerScheme = "vscode" | "cursor" | "windsurf";
```

and uses it as the new type for a `fileOpener` option in `config.json`.
If set, this will be used to linkify file annotations in the output
using the URI-based file opener supported in VS Code-based IDEs.

Currently, this does not pass:

Updated `codex-cli/tests/markdown.test.tsx` to verify the new behavior.
Note it required mocking `supports-hyperlinks` and temporarily modifying
`chalk.level` to yield the desired output.

codex-cli/src/app.tsx

@@ -50,6 +50,7 @@ export default function App({
       <TerminalChatPastRollout
         session={rollout.session}
         items={rollout.items}
+        fileOpener={config.fileOpener}
       />
     );
   }

codex-cli/src/components/chat/message-history.tsx

@@ -1,6 +1,7 @@
 import type { TerminalHeaderProps } from "./terminal-header.js";
 import type { GroupedResponseItem } from "./use-message-grouping.js";
 import type { ResponseItem } from "openai/resources/responses/responses.mjs";
+import type { FileOpenerScheme } from "src/utils/config.js";
 
 import TerminalChatResponseItem from "./terminal-chat-response-item.js";
 import TerminalHeader from "./terminal-header.js";
@@ -19,11 +20,13 @@ type MessageHistoryProps = {
   confirmationPrompt: React.ReactNode;
   loading: boolean;
   headerProps: TerminalHeaderProps;
+  fileOpener: FileOpenerScheme | undefined;
 };
 
 const MessageHistory: React.FC<MessageHistoryProps> = ({
   batch,
   headerProps,
+  fileOpener,
 }) => {
   const messages = batch.map(({ item }) => item!);
 
@@ -68,7 +71,10 @@ const MessageHistory: React.FC<MessageHistoryProps> = ({
                 message.type === "message" && message.role === "user" ? 0 : 1
               }
             >
-              <TerminalChatResponseItem item={message} />
+              <TerminalChatResponseItem
+                item={message}
+                fileOpener={fileOpener}
+              />
             </Box>
           );
         }}

codex-cli/src/components/chat/terminal-chat-past-rollout.tsx

@@ -1,5 +1,6 @@
 import type { TerminalChatSession } from "../../utils/session.js";
 import type { ResponseItem } from "openai/resources/responses/responses";
+import type { FileOpenerScheme } from "src/utils/config.js";
 
 import TerminalChatResponseItem from "./terminal-chat-response-item";
 import { Box, Text } from "ink";
@@ -8,9 +9,11 @@ import React from "react";
 export default function TerminalChatPastRollout({
   session,
   items,
+  fileOpener,
 }: {
   session: TerminalChatSession;
   items: Array<ResponseItem>;
+  fileOpener: FileOpenerScheme | undefined;
 }): React.ReactElement {
   const { version, id: sessionId, model } = session;
   return (
@@ -51,9 +54,13 @@ export default function TerminalChatPastRollout({
         {React.useMemo(
           () =>
             items.map((item, key) => (
-              <TerminalChatResponseItem key={key} item={item} />
+              <TerminalChatResponseItem
+                key={key}
+                item={item}
+                fileOpener={fileOpener}
+              />
             )),
-          [items],
+          [items, fileOpener],
         )}
       </Box>
     </Box>

codex-cli/src/components/chat/terminal-chat-response-item.tsx

@@ -8,6 +8,7 @@ import type {
   ResponseOutputMessage,
   ResponseReasoningItem,
 } from "openai/resources/responses/responses";
+import type { FileOpenerScheme } from "src/utils/config";
 
 import { useTerminalSize } from "../../hooks/use-terminal-size";
 import { collapseXmlBlocks } from "../../utils/file-tag-utils";
@@ -16,16 +17,20 @@ import chalk, { type ForegroundColorName } from "chalk";
 import { Box, Text } from "ink";
 import { parse, setOptions } from "marked";
 import TerminalRenderer from "marked-terminal";
+import path from "path";
 import React, { useEffect, useMemo } from "react";
+import supportsHyperlinks from "supports-hyperlinks";
 
 export default function TerminalChatResponseItem({
   item,
   fullStdout = false,
   setOverlayMode,
+  fileOpener,
 }: {
   item: ResponseItem;
   fullStdout?: boolean;
   setOverlayMode?: React.Dispatch<React.SetStateAction<OverlayModeType>>;
+  fileOpener: FileOpenerScheme | undefined;
 }): React.ReactElement {
   switch (item.type) {
     case "message":
@@ -33,6 +38,7 @@ export default function TerminalChatResponseItem({
         <TerminalChatResponseMessage
           setOverlayMode={setOverlayMode}
           message={item}
+          fileOpener={fileOpener}
         />
       );
     case "function_call":
@@ -50,7 +56,9 @@ export default function TerminalChatResponseItem({
 
   // @ts-expect-error `reasoning` is not in the responses API yet
   if (item.type === "reasoning") {
-    return <TerminalChatResponseReasoning message={item} />;
+    return (
+      <TerminalChatResponseReasoning message={item} fileOpener={fileOpener} />
+    );
   }
 
   return <TerminalChatResponseGenericMessage message={item} />;
@@ -78,8 +86,10 @@ export default function TerminalChatResponseItem({
 
 export function TerminalChatResponseReasoning({
   message,
+  fileOpener,
 }: {
   message: ResponseReasoningItem & { duration_ms?: number };
+  fileOpener: FileOpenerScheme | undefined;
 }): React.ReactElement | null {
   // Only render when there is a reasoning summary
   if (!message.summary || message.summary.length === 0) {
@@ -92,7 +102,7 @@ export function TerminalChatResponseReasoning({
         return (
           <Box key={key} flexDirection="column">
             {s.headline && <Text bold>{s.headline}</Text>}
-            <Markdown>{s.text}</Markdown>
+            <Markdown fileOpener={fileOpener}>{s.text}</Markdown>
           </Box>
         );
       })}
@@ -108,9 +118,11 @@ const colorsByRole: Record<string, ForegroundColorName> = {
 function TerminalChatResponseMessage({
   message,
   setOverlayMode,
+  fileOpener,
 }: {
   message: ResponseInputMessageItem | ResponseOutputMessage;
   setOverlayMode?: React.Dispatch<React.SetStateAction<OverlayModeType>>;
+  fileOpener: FileOpenerScheme | undefined;
 }) {
   // auto switch to model mode if the system message contains "has been deprecated"
   useEffect(() => {
@@ -129,7 +141,7 @@ function TerminalChatResponseMessage({
       <Text bold color={colorsByRole[message.role] || "gray"}>
         {message.role === "assistant" ? "codex" : message.role}
       </Text>
-      <Markdown>
+      <Markdown fileOpener={fileOpener}>
         {message.content
           .map(
             (c) =>
@@ -240,26 +252,87 @@ export function TerminalChatResponseGenericMessage({
 
 export type MarkdownProps = TerminalRendererOptions & {
   children: string;
+  fileOpener: FileOpenerScheme | undefined;
+  /** Base path for resolving relative file citation paths. */
+  cwd?: string;
 };
 
 export function Markdown({
   children,
+  fileOpener,
+  cwd,
   ...options
 }: MarkdownProps): React.ReactElement {
   const size = useTerminalSize();
 
   const rendered = React.useMemo(() => {
+    const linkifiedMarkdown = rewriteFileCitations(children, fileOpener, cwd);
+
     // Configure marked for this specific render
     setOptions({
       // @ts-expect-error missing parser, space props
       renderer: new TerminalRenderer({ ...options, width: size.columns }),
     });
-    const parsed = parse(children, { async: false }).trim();
+    const parsed = parse(linkifiedMarkdown, { async: false }).trim();
 
     // Remove the truncation logic
     return parsed;
     // eslint-disable-next-line react-hooks/exhaustive-deps -- options is an object of primitives
-  }, [children, size.columns, size.rows]);
+  }, [
+    children,
+    size.columns,
+    size.rows,
+    fileOpener,
+    supportsHyperlinks.stdout,
+    chalk.level,
+  ]);
 
   return <Text>{rendered}</Text>;
 }
+
+/** Regex to match citations for source files (hence the `F:` prefix). */
+const citationRegex = new RegExp(
+  [
+    // Opening marker
+    "【",
+
+    // Capture group 1: file ID or name (anything except '†')
+    "F:([^†]+)",
+
+    // Field separator
+    "†",
+
+    // Capture group 2: start line (digits)
+    "L(\\d+)",
+
+    // Non-capturing group for optional end line
+    "(?:",
+
+    // Capture group 3: end line (digits or '?')
+    "-L(\\d+|\\?)",
+
+    // End of optional group (may not be present)
+    ")?",
+
+    // Closing marker
+    "】",
+  ].join(""),
+  "g", // Global flag
+);
+
+function rewriteFileCitations(
+  markdown: string,
+  fileOpener: FileOpenerScheme | undefined,
+  cwd: string = process.cwd(),
+): string {
+  if (!fileOpener) {
+    // Should we reformat the citations even if we cannot linkify them?
+    return markdown;
+  }
+
+  return markdown.replace(citationRegex, (_match, file, start, _end) => {
+    const absPath = path.resolve(cwd, file);
+    const uri = `${fileOpener}://file${absPath}:${start}`;
+    return `[${file}](${uri})`;
+  });
+}

codex-cli/src/components/chat/terminal-chat.tsx

@@ -480,6 +480,7 @@ export default function TerminalChat({
               initialImagePaths,
               flexModeEnabled: Boolean(config.flexMode),
             }}
+            fileOpener={config.fileOpener}
           />
         ) : (
           <Box>

codex-cli/src/components/chat/terminal-message-history.tsx

@@ -2,6 +2,7 @@ import type { OverlayModeType } from "./terminal-chat.js";
 import type { TerminalHeaderProps } from "./terminal-header.js";
 import type { GroupedResponseItem } from "./use-message-grouping.js";
 import type { ResponseItem } from "openai/resources/responses/responses.mjs";
+import type { FileOpenerScheme } from "src/utils/config.js";
 
 import TerminalChatResponseItem from "./terminal-chat-response-item.js";
 import TerminalHeader from "./terminal-header.js";
@@ -23,6 +24,7 @@ type TerminalMessageHistoryProps = {
   headerProps: TerminalHeaderProps;
   fullStdout: boolean;
   setOverlayMode: React.Dispatch<React.SetStateAction<OverlayModeType>>;
+  fileOpener: FileOpenerScheme | undefined;
 };
 
 const TerminalMessageHistory: React.FC<TerminalMessageHistoryProps> = ({
@@ -33,6 +35,7 @@ const TerminalMessageHistory: React.FC<TerminalMessageHistoryProps> = ({
   thinkingSeconds: _thinkingSeconds,
   fullStdout,
   setOverlayMode,
+  fileOpener,
 }) => {
   // Flatten batch entries to response items.
   const messages = useMemo(() => batch.map(({ item }) => item!), [batch]);
@@ -69,6 +72,7 @@ const TerminalMessageHistory: React.FC<TerminalMessageHistoryProps> = ({
                 item={message}
                 fullStdout={fullStdout}
                 setOverlayMode={setOverlayMode}
+                fileOpener={fileOpener}
               />
             </Box>
           );

codex-cli/src/utils/config.ts

@@ -135,6 +135,8 @@ export function getApiKey(provider: string = "openai"): string | undefined {
   return undefined;
 }
 
+export type FileOpenerScheme = "vscode" | "cursor" | "windsurf";
+
 // Represents config as persisted in config.json.
 export type StoredConfig = {
   model?: string;
@@ -162,6 +164,12 @@ export type StoredConfig = {
   /** User-defined safe commands */
   safeCommands?: Array<string>;
   reasoningEffort?: ReasoningEffort;
+
+  /**
+   * URI-based file opener. This is used when linking code references in
+   * terminal output.
+   */
+  fileOpener?: FileOpenerScheme;
 };
 
 // Minimal config written on first run.  An *empty* model string ensures that
@@ -206,6 +214,7 @@ export type AppConfig = {
       maxLines: number;
     };
   };
+  fileOpener?: FileOpenerScheme;
 };
 
 // Formatting (quiet mode-only).
@@ -429,6 +438,7 @@ export const loadConfig = (
     },
     disableResponseStorage: storedConfig.disableResponseStorage === true,
     reasoningEffort: storedConfig.reasoningEffort,
+    fileOpener: storedConfig.fileOpener,
   };
 
   // -----------------------------------------------------------------------