Function namespace

pkg/errors/pkg_util.go:34–44

namespace is called when errors are defined. It returns the package path of the caller (skipping the first frames of the call stack) and makes it relative (so for example: pkg/errors).

(skip int)

// It returns the package path of the caller (skipping the first frames of the call stack)
// and makes it relative (so for example: pkg/errors).
func namespace(skip int) string {
	pc, _, _, ok := runtime.Caller(skip)
	if !ok {
		panic("could not determine source of error")
	}
	fun := runtime.FuncForPC(pc).Name()
	slashIdx := strings.LastIndexByte(fun, '/')
	dotIdx := strings.IndexByte(fun[slashIdx:], '.')
	pkg := fun[:slashIdx+dotIdx]
	return strings.TrimPrefix(pkg, pkgPrefix)
}