find config file which with extension first.

viper.go

@@ -1978,12 +1978,6 @@ func (v *Viper) searchInPath(in string) (filename string) {
 		}
 	}
 
-	if v.configType != "" {
-		if b, _ := exists(v.fs, filepath.Join(in, v.configName)); b {
-			return filepath.Join(in, v.configName)
-		}
-	}
-
 	return ""
 }
 
@@ -1998,6 +1992,14 @@ func (v *Viper) findConfigFile() (string, error) {
 			return file, nil
 		}
 	}
+
+	for _, in := range v.configPaths {
+		if v.configType != "" {
+			if b, _ := exists(v.fs, filepath.Join(in, v.configName)); b {
+				return filepath.Join(in, v.configName), nil
+			}
+		}
+	}
 	return "", ConfigFileNotFoundError{v.configName, fmt.Sprintf("%s", v.configPaths)}
 }
 

viper_test.go

@@ -361,6 +361,30 @@ func TestSearchInPath_FilesOnly(t *testing.T) {
 	assert.NoError(t, err)
 }
 
+func TestSearchInPath_ExtensionFirst(t *testing.T) {
+	exceptFile := "/tmp/withExtension.yaml"
+	_, err := v.fs.Create(exceptFile)
+	defer func() {
+		_ = v.fs.Remove("/tmp/withExtension.yaml")
+	}()
+
+	assert.NoError(t, err)
+	_, err = v.fs.Create("./.withoutExtension")
+	assert.NoError(t, err)
+	defer func() {
+		_ = v.fs.Remove("./.withoutExtension")
+	}()
+
+	SetConfigName("withExtension")
+	SetConfigType("yaml")
+	AddConfigPath(".")
+	AddConfigPath("/tmp")
+
+	filename, err := v.getConfigFile()
+	assert.Equal(t, exceptFile, filename)
+	assert.NoError(t, err)
+}
+
 func TestDefault(t *testing.T) {
 	SetDefault("age", 45)
 	assert.Equal(t, 45, Get("age"))