perf: cache stats for fasterlookup

1 files changed, 37 insertions, 0 deletions

diff --git a/cache.go b/cache.go
new file mode 100644
index 0000000..d0b11e5
--- /dev/null
+++ b/cache.go
@@ -0,0 +1,37 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/adrg/xdg"
+)
+
+func CachePath(rel string) string {
+	path := filepath.Join(xdg.CacheHome, "wthis", rel)
+	_ = os.MkdirAll(filepath.Dir(path), 0o755)
+	return path
+}
+
+func ReadCache(relPath string, ttl time.Duration) ([]byte, bool) {
+	path := CachePath(relPath)
+
+	info, err := os.Stat(path)
+	if err != nil {
+		return nil, false
+	}
+	if time.Since(info.ModTime()) > ttl {
+		return nil, false
+	}
+	b, err := os.ReadFile(path)
+	if err != nil {
+		return nil, false
+	}
+	return b, true
+}
+
+func WriteCache(relPath string, data []byte) error {
+	path := CachePath(relPath)
+	return os.WriteFile(path, data, 0o644)
+}