// Package runtimeinfo implements the private runtime version state used by the
// public buildinfo facade.
package runtimeinfo

import "runtime/debug"

var injectedVersion string

// Version returns the injected version or the running executable's main module
// version, falling back to "dev" when neither provides a release identifier.
func Version() string {
	return version(injectedVersion, debug.ReadBuildInfo)
}

func version(injected string, readBuildInfo func() (*debug.BuildInfo, bool)) string {
	if injected != "" {
		return injected
	}

	info, ok := readBuildInfo()
	if ok && info != nil && info.Main.Version != "" && info.Main.Version != "(devel)" {
		return info.Main.Version
	}

	return "dev"
}