collapse = TRUE,
  comment = "#>"

Using whereami with shiny is simple. Place cat_where(whereami()) anywhere in a shiny command and every time the rendering application hits the line it will print to console indicating which line has been hit accompanied by a counter.

── Running renderPlot(...) at shiny.R#15 (1) ───────────────────────────────────────────
── Running renderPlot(...) at shiny.R#15 (2) ───────────────────────────────────────────

Here is an example of a simple app that uses whereami in the renderPlot chunk.

# Global variables can go here
n <- 200

# Define the UI
ui <- bootstrapPage(
  numericInput('n', 'Number of obs', n),

# Define the server code
server <- function(input, output) {
  output$plot <- renderPlot({

# Return a Shiny app object
shinyApp(ui = ui, server = server)

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whereami documentation built on Nov. 7, 2019, 5:08 p.m.