error.go

package fmt

import (
	"strings"

	bosherr "github.com/cloudfoundry/bosh-agent/errors"
	boshsys "github.com/cloudfoundry/bosh-agent/system"
)

var Indent = "  "

func MultilineError(err error) string {
	return prefixingMultilineError(err, "")
}

func prefixingMultilineError(err error, prefix string) string {
	switch specificErr := err.(type) {
	case bosherr.ComplexError:
		return prefix + specificErr.Err.Error() + ":\n" + prefixingMultilineError(specificErr.Cause, prefix+Indent)
	case bosherr.MultiError:
		lines := make([]string, len(specificErr.Errors), len(specificErr.Errors))
		for i, sibling := range specificErr.Errors {
			lines[i] = prefixingMultilineError(sibling, prefix)
		}
		return strings.Join(lines, "\n")
	case boshsys.ExecError:
		lines := []string{
			"Error Executing Command:",
			prefixEachLine(specificErr.Command, Indent),
			"StdOut:",
			prefixEachLine(specificErr.StdOut, Indent),
			"StdErr:",
			prefixEachLine(specificErr.StdErr, Indent),
		}
		return prefixEachLine(strings.Join(lines, "\n"), prefix)
	default:
		return prefix + specificErr.Error()
	}
}

func prefixEachLine(str string, prefix string) string {
	return prefix + strings.Replace(str, "\n", "\n"+prefix, -1)
}