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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 fmt_test
import (
"path/filepath"
"regexp"
"golang.org/x/exp/errors"
"golang.org/x/exp/errors/fmt"
)
func baz() error { return errors.New("baz flopped") }
func bar() error { return fmt.Errorf("bar(nameserver 139): %v", baz()) }
func foo() error { return fmt.Errorf("foo: %s", bar()) }
func Example_formatting() {
err := foo()
fmt.Println("Error:")
fmt.Printf("%v\n", err)
fmt.Println()
fmt.Println("Detailed error:")
fmt.Println(stripPath(fmt.Sprintf("%+v\n", err)))
// Output:
// Error:
// foo: bar(nameserver 139): baz flopped
//
// Detailed error:
// foo:
// golang.org/x/exp/errors/fmt_test.foo
// golang.org/x/exp/errors/fmt/format_example_test.go:17
// - bar(nameserver 139):
// golang.org/x/exp/errors/fmt_test.bar
// golang.org/x/exp/errors/fmt/format_example_test.go:16
// - baz flopped:
// golang.org/x/exp/errors/fmt_test.baz
// golang.org/x/exp/errors/fmt/format_example_test.go:15
}
func stripPath(s string) string {
rePath := regexp.MustCompile(`( [^ ]*)golang.org`)
s = rePath.ReplaceAllString(s, " golang.org")
s = filepath.ToSlash(s)
return s
}
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