RunOutput = object
  arguments*: seq[string]
  output*: string
  ok*: bool

proc runSomething(exe: string; args: seq[string]; options: set[ProcessOption];
                  nimbleDir = ""): RunOutput {.
    ...raises: [OSError, ValueError, Exception, IOError], tags: [ReadDirEffect,
    ReadEnvEffect, ReadIOEffect, RootEffect, WriteEnvEffect, ExecIOEffect].}

proc stripPkgs(nimbleDir: string): string {....raises: [], tags: [].}