updates: use brew api for version check (#10809)

## Problem

`codex` currently prompts you to update via `brew upgrade --cask codex`
but the brew api does not return the new version

> <img width="1500" height="822" alt="Screenshot 2026-02-05 at 12 36
09 PM"
src="https://github.com/user-attachments/assets/9e12929d-95e8-43f4-8fba-ab93f5f76e73"
/>

## Solution

`codex-rs/tui/src/updates.rs` was using the [latest cask in
github](https://github.com/Homebrew/homebrew-cask/blob/HEAD/Casks/c/codex.rb)
but this does not agree with the brew api, which leads to the issue
above. Instead we use the [brew api json
endpoint](https://github.com/Homebrew/homebrew-cask/blob/HEAD/Casks/c/codex.rb)
to ensure our version check agrees with the upgrade command.

codex-rs/tui/src/updates.rs

@@ -56,8 +56,7 @@ struct VersionInfo {
 
 const VERSION_FILENAME: &str = "version.json";
 // We use the latest version from the cask if installation is via homebrew - homebrew does not immediately pick up the latest release and can lag behind.
-const HOMEBREW_CASK_URL: &str =
+const HOMEBREW_CASK_API_URL: &str = "https://formulae.brew.sh/api/cask/codex.json";
-    "https://raw.githubusercontent.com/Homebrew/homebrew-cask/HEAD/Casks/c/codex.rb";
 const LATEST_RELEASE_URL: &str = "https://api.github.com/repos/openai/codex/releases/latest";
 
 #[derive(Deserialize, Debug, Clone)]
@@ -65,6 +64,11 @@ struct ReleaseInfo {
     tag_name: String,
 }
 
+#[derive(Deserialize, Debug, Clone)]
+struct HomebrewCaskInfo {
+    version: String,
+}
+
 fn version_filepath(config: &Config) -> PathBuf {
     config.codex_home.join(VERSION_FILENAME)
 }
@@ -77,14 +81,14 @@ fn read_version_info(version_file: &Path) -> anyhow::Result<VersionInfo> {
 async fn check_for_update(version_file: &Path) -> anyhow::Result<()> {
     let latest_version = match update_action::get_update_action() {
         Some(UpdateAction::BrewUpgrade) => {
-            let cask_contents = create_client()
+            let HomebrewCaskInfo { version } = create_client()
-                .get(HOMEBREW_CASK_URL)
+                .get(HOMEBREW_CASK_API_URL)
                 .send()
                 .await?
                 .error_for_status()?
-                .text()
+                .json::<HomebrewCaskInfo>()
                 .await?;
-            extract_version_from_cask(&cask_contents)?
+            version
         }
         _ => {
             let ReleaseInfo {
@@ -123,18 +127,6 @@ fn is_newer(latest: &str, current: &str) -> Option<bool> {
     }
 }
 
-fn extract_version_from_cask(cask_contents: &str) -> anyhow::Result<String> {
-    cask_contents
-        .lines()
-        .find_map(|line| {
-            let line = line.trim();
-            line.strip_prefix("version \"")
-                .and_then(|rest| rest.strip_suffix('"'))
-                .map(ToString::to_string)
-        })
-        .ok_or_else(|| anyhow::anyhow!("Failed to find version in Homebrew cask file"))
-}
-
 fn extract_version_from_latest_tag(latest_tag_name: &str) -> anyhow::Result<String> {
     latest_tag_name
         .strip_prefix("rust-v")
@@ -190,16 +182,18 @@ mod tests {
     use super::*;
 
     #[test]
-    fn parses_version_from_cask_contents() {
+    fn extract_version_from_brew_api_json() {
-        let cask = r#"
+        //
-            cask "codex" do
+        // https://formulae.brew.sh/api/cask/codex.json
-              version "0.55.0"
+        let cask_json = r#"{
-            end
+            "token": "codex",
-        "#;
+            "full_token": "codex",
-        assert_eq!(
+            "tap": "homebrew/cask",
-            extract_version_from_cask(cask).expect("failed to parse version"),
+            "version": "0.96.0",
-            "0.55.0"
+        }"#;
-        );
+        let HomebrewCaskInfo { version } = serde_json::from_str::<HomebrewCaskInfo>(cask_json)
+            .expect("failed to parse version from cask json");
+        assert_eq!(version, "0.96.0");
     }
 
     #[test]