gravitton / errors

import (

	"fmt"

	"strings"

	"sync"

)

type MultiError struct {

	errs  []error

	mutex sync.Mutex

}

func NewMulti() *MultiError {

	return &MultiError{}

}

func (e *MultiError) Error() string {

	if len(e.errs) == 1 {

		return e.errs[0].Error()

	}

	msg := make([]string, len(e.errs))

	for i, err := range e.errs {

		msg[i] = err.Error()

	}

	return fmt.Sprintf("%d errors occurred:\n %s", len(e.errs), strings.Join(msg, "\n "))

}

func (e *MultiError) GoString() string {

	return fmt.Sprintf("%#v", e.errs)

}

func (e *MultiError) Append(err error) {

	if err == nil {

		return

	}

	e.mutex.Lock()

	defer e.mutex.Unlock()

	e.errs = append(e.errs, err)

}

func (e *MultiError) ErrorOrNil() error {

	if len(e.errs) == 0 {

		return nil

	}

	return e

}