title: Possible to show console messages (written with `message`) in a shiny ui?
body: <p>I don't understand R's message vs cat vs print vs etc. too deeply, but I'm wondering if it's possible to capture messages and show them in a shiny app?</p>
  
  <p>Example: the following app can capture cat statements (and print statements as well) but not message statements</p>
  
  <pre><code>runApp(shinyApp(
    ui = fluidPage(
      textOutput("test")
    ),
    server = function(input,output, session) {
      output$test &lt;- renderPrint({
        cat("test cat")
        message("test message")
      })
    }
  ))
  </code></pre>
  
  <p><a href="https://groups.google.com/forum/#!topic/shiny-discuss/UCacIquFJQY" rel="noreferrer">Cross post from the shiny-discuss Google group since I got 0 answers.</a></p>