e5

var Check = CheckFunc(func(err error, args ...error) error {
	if err == nil {
		return nil
	}
	err = Wrap.With(args...)(err)
	return Throw(err)
})

var Wrap = WrapFunc(func(err error) error {
	return err
})

var WrapStacktrace = WrapFunc(func(prev error) error {
	if prev == nil {
		return nil
	}
	if stacktraceIncluded(prev) {
		return prev
	}

	stacktrace := new(Stacktrace)
	v, put := pcsPool.Get()
	defer put()
	pcs := *v

	n := runtime.Callers(2, pcs)
	stacktrace.Frames = make([]Frame, 0, n)
	frames := runtime.CallersFrames(pcs[:n])
	for {
		frame, more := frames.Next()
		if strings.HasPrefix(frame.Function, "github.com/reusee/e5.") &&
			!strings.HasPrefix(frame.Function, "github.com/reusee/e5.Test") {

			if !more {
				break
			}
			continue
		}
		dir, file := filepath.Split(frame.File)
		mod, fn := path.Split(frame.Function)
		if i := strings.Index(dir, mod); i > 0 {
			dir = dir[i:]
		}
		pkg := fn[:strings.IndexByte(fn, '.')]
		pkgPath := mod + pkg
		stacktrace.Frames = append(stacktrace.Frames, Frame{
			File:     file,
			Dir:      dir,
			Line:     frame.Line,
			Pkg:      pkg,
			Function: fn,
			PkgPath:  pkgPath,
		})
		if !more {
			break
		}
	}

	err := Join(stacktrace, prev)
	return err
})