import
  std/typetraits, preserves

type
  CommandLineKind* {.pure.} = enum
    `shell`, `full`
  CommandLineShell* = string
  `CommandLine`* {.preservesOr.} = object
    case orKind*: CommandLineKind
    of CommandLineKind.`shell`:
        `shell`*: CommandLineShell

    of CommandLineKind.`full`:
        `full`*: FullCommandLine

  
  Exec* {.preservesRecord: "exec".} = object
    `argv`*: CommandLine
    `restartPolicy`*: RestartPolicy

  `RestartPolicy`* {.preservesOr, pure.} = enum
    `always`, `onError`, `all`, `never`
  FullCommandLine* {.preservesTuple.} = object
    `program`*: string
    `args`* {.preservesTupleTail.}: seq[string]

proc `$`*(x: CommandLine | Exec | FullCommandLine): string =
  `$`(toPreserve(x))

proc encode*(x: CommandLine | Exec | FullCommandLine): seq[byte] =
  encode(toPreserve(x))