From eb6157d5a62d8d071096b89af92e1a0ab2daca16 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Sedl=C3=A1=C4=8Dek?= <david.littlefarmer@gmail.com>
Date: Wed, 23 Aug 2023 13:27:51 +0200
Subject: [PATCH] Error type (#4)

* Error type checker

* Update README.md
---
 README.md  | 2 +-
 devslog.go | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index e354fe4..41524ca 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 `devslog` is zero dependency custom logging handler for Go's standard [`log/slog`](https://pkg.go.dev/log/slog) package that provides structured logging with colorful and indented structure for developing.
 
 ### Develop with this output
-![image](https://github.com/golang-cz/devslog/assets/17728576/be0eca2c-192b-442f-b3c0-eecef107871a)
+![image](https://github.com/golang-cz/devslog/assets/17728576/0bae7ec7-0513-41a4-9682-0e0fc74747e7)
 
 ### Instead of these outputs
 `TextHandler`
diff --git a/devslog.go b/devslog.go
index 0b8912a..a75c384 100644
--- a/devslog.go
+++ b/devslog.go
@@ -233,6 +233,13 @@ func (h *developHandler) colorize(buf []byte, as attributes, level int, groups [
 			val = cs(val, fgCyan)
 		case slog.KindAny:
 			a := a.Value.Any()
+			err, isError := a.(error)
+			if isError {
+				mark = cs("E", fgRed)
+				val = csb(fmt.Sprintf(" %v ", err), fgBlack, bgRed)
+				break
+			}
+
 			jsonBytes, err := json.Marshal(a)
 			if err != nil {
 				break