format.go
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format.go
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	package multierror

	import (
	"fmt"
	"strings"
	)

	// ErrorFormatFunc is a function callback that is called by Error to
	// turn the list of errors into a string.
	type ErrorFormatFunc func([]error) string

	// ListFormatFunc is a basic formatter that outputs the number of errors
	// that occurred along with a bullet point list of the errors.
	func ListFormatFunc(es []error) string {
	if len(es) == 1 {
	return fmt.Sprintf("1 error occurred:\n\t* %s\n\n", es[0])
	}

	points := make([]string, len(es))
	for i, err := range es {
	points[i] = fmt.Sprintf("* %s", err)
	}

	return fmt.Sprintf(
	"%d errors occurred:\n\t%s\n\n",
	len(es), strings.Join(points, "\n\t"))
	}