# Onexit Usage in slackr

### Onexit Usage

    ctl <- c(4.17, 5.58, 5.18, 6.11, 4.50, 4.61, 5.17, 4.53, 5.33, 5.14)
    trt <- c(4.81, 4.17, 4.41, 3.59, 5.87, 3.83, 6.03, 4.89, 4.32, 4.69)
    group <- gl(2, 10, 20, labels = c("Ctl", "Trt"))
    weight <- c(ctl, trt)

    # pass a message to Slack channel 'general'
    register_onexit(lm, "bazinga!", channel = "#general")

    lm.D9 <- slack_lm(weight ~ group)

    # test that output keeps inheritance
    summary(lm.D9)

    # pass a message to Slack channel 'general' with a header message to begin output
    register_onexit(
      lm,
      "bazinga!",
      channel = "#general",
      header_msg = "This is a message to begin"
    )

    lm.D9 <- slack_lm(weight ~ group)

    # onexit with an expression that calls lm.plot
    register_onexit(
      lm,
      {
        par(mfrow = c(2, 2), oma = c(0, 0, 2, 0))
        plot(z) # z is the internal output of stats::lm()
      },
      channel = "#general",
      header_msg = "This is a plot just for this output",
      use_device = TRUE
    )

    lm.D9 <- slack_lm(weight ~ group)

    # clean up slack channel from examples
    slackr_delete(count = 6, channel = "#general")