support powershell

envImpl.go

@@ -22,7 +22,10 @@ func SerializeEnvvar(shellName string, asUniversalVar bool, kvPairs map[string]s
 		}
 		break
 	case "powershell":
-		panic("serializeEnvvar.NotSupportedError: doesn't support output powershell variable. ")
+		fmtStr = "Set-Variable -Name %v -Value '%v' -Scope Global"
+		if asUniversalVar {
+			panic("serializeEnvvar.NotSupportedError: doesn't support powershell universal variable. ")
+		}
 	default:
 		panic("serializeEnvvar.InvalidArgument: shellName should be bash,fish,powershell, instead of " + shellName)
 	}