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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package errors
import (
"fmt"
"strings"
)
// A Formatter formats error messages.
type Formatter interface {
error
// FormatError prints the receiver's first error and returns the next error in
// the error chain, if any.
FormatError(p Printer) (next error)
}
// A Printer formats error messages.
//
// The most common implementation of Printer is the one provided by package fmt
// during Printf (as of Go 1.13). Localization packages such as golang.org/x/text/message
// typically provide their own implementations.
type Printer interface {
// Print appends args to the message output.
Print(args ...interface{})
// Printf writes a formatted string.
Printf(format string, args ...interface{})
// Detail reports whether error detail is requested.
// After the first call to Detail, all text written to the Printer
// is formatted as additional detail, or ignored when
// detail has not been requested.
// If Detail returns false, the caller can avoid printing the detail at all.
Detail() bool
}
// Errorf creates new error with format.
func Errorf(format string, a ...interface{}) error {
if !Trace() || strings.Contains(format, "%w") {
return fmt.Errorf(format, a...)
}
return &errorString{fmt.Sprintf(format, a...), Caller(1)}
}
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