From 21a7fd828ed231bbe62068d6aafa5aa9f85dc79e Mon Sep 17 00:00:00 2001
From: andig <cpuidle@gmx.de>
Date: Tue, 30 May 2023 12:07:27 +0200
Subject: [PATCH] Allow ConfigParseError to unwrap (#1433)

* Allow ConfigParseError to unwrap

* wip

* Avoid pointer type
---
 util.go       |  5 +++++
 viper_test.go | 13 +++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/util.go b/util.go
index 64e657505..95009a147 100644
--- a/util.go
+++ b/util.go
@@ -31,6 +31,11 @@ func (pe ConfigParseError) Error() string {
 	return fmt.Sprintf("While parsing config: %s", pe.err.Error())
 }
 
+// Unwrap returns the wrapped error.
+func (pe ConfigParseError) Unwrap() error {
+	return pe.err
+}
+
 // toCaseInsensitiveValue checks if the value is a  map;
 // if so, create a copy and lower-case the keys recursively.
 func toCaseInsensitiveValue(value interface{}) interface{} {
diff --git a/viper_test.go b/viper_test.go
index b48c95081..e0bfc57bd 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -8,6 +8,7 @@ package viper
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"io"
 	"io/ioutil"
 	"os"
@@ -1573,6 +1574,18 @@ func TestWrongDirsSearchNotFoundForMerge(t *testing.T) {
 	assert.Equal(t, `default`, v.GetString(`key`))
 }
 
+var yamlInvalid = []byte(`hash: map
+- foo
+- bar
+`)
+
+func TestUnwrapParseErrors(t *testing.T) {
+	SetConfigType("yaml")
+	if !errors.As(ReadConfig(bytes.NewBuffer(yamlInvalid)), &ConfigParseError{}) {
+		t.Fatalf("not a ConfigParseError")
+	}
+}
+
 func TestSub(t *testing.T) {
 	v := New()
 	v.SetConfigType("yaml")