R debugging

gistfile1.r

options(shiny.reactlog=TRUE, warn=2, show.error.locations=TRUE, error=recover)

# interactive session
browser()

# print message
message('message')

# error handling
err.hanlder <- function(e) message(e)
warn.handler <- function(w) message(w)
tryCatch(expr, error=err.handler, warning=warn.handler

# shiny
runExample('01_hello')
# press Ctrl+F3 to review reactive dependency graph
# call showReactlog() after terminating server to view graph of previous session
runApp('path/to/myapp', display.mode='showcase') # for display mode