cmd/formatter: remove unused SetMultiErrorFormat

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cmd/formatter/multierrformat.go

@@ -1,38 +0,0 @@
-/*
-   Copyright 2020 Docker Compose CLI authors
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-*/
-
-package formatter
-
-import (
-	"strings"
-
-	"github.com/hashicorp/go-multierror"
-)
-
-// SetMultiErrorFormat set cli default format for multi-errors
-func SetMultiErrorFormat(errs *multierror.Error) {
-	if errs != nil {
-		errs.ErrorFormat = formatErrors
-	}
-}
-
-func formatErrors(errs []error) string {
-	messages := make([]string, len(errs))
-	for i, err := range errs {
-		messages[i] = "Error: " + err.Error()
-	}
-	return strings.Join(messages, "\n")
-}