From 0f18c94faa70942698c9904e79d0985464458604 Mon Sep 17 00:00:00 2001
From: Eltrac <hi@guhub.cn>
Date: Fri, 21 Nov 2025 09:16:23 +0800
Subject: perf: write timestamp to cache file instead of relying on mtime

---
 brewcheck.go | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/brewcheck.go b/brewcheck.go
index ac34786..d550db4 100644
--- a/brewcheck.go
+++ b/brewcheck.go
@@ -17,10 +17,10 @@ func EnsureBrewAvailable() {
 	cache := filepath.Join(xdg.CacheHome, "wthis", "brew-checked")
 
 	// 1. check if cache file exists and is fresh
-	if info, err := os.Stat(cache); err == nil {
-		if time.Since(info.ModTime()) < TTL {
-			return // recently verified that brew exists
-		}
+	data, _ := os.ReadFile(cache)
+	t, _ := time.Parse(time.RFC3339, string(data))
+	if time.Since(t) < TTL {
+		return
 	}
 
 	// 2. otherwise, actually check
@@ -33,5 +33,5 @@ func EnsureBrewAvailable() {
 
 	// 3. write cache
 	_ = os.MkdirAll(filepath.Dir(cache), 0o755)
-	_ = os.WriteFile(cache, []byte{}, 0o644)
+	_ = os.WriteFile(cache, []byte(time.Now().Format(time.RFC3339)), 0o644)
 }
-- 
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