task.nim

  template task*(name: untyped; description: string; body: untyped): untyped =
    ## Defines a task. Hidden tasks are supported via an empty description.
    ## Example:
    ##
    ## .. code-block:: nim
    ##  task build, "default build is via the C backend":
    ##    setCommand "c"
    proc `name Task`*() =
      setCommand "nop"
      body

    let cmd = getCommand()
    if cmd.len == 0 or cmd ==? "help":
      setCommand "help"
      writeTask(astToStr(name), description)
    elif cmd ==? astToStr(name):
      `name Task`()