Data Science Desktop Survival Guide by Graham Williams
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Indentation

20200105

resume

Use a consistent indentation. I prefer 2 spaces within both Emacs ESS and with a good font (e.g., Courier font in RStudio works well but Courier 10picth is too compressed). Try 4 if using a smaller font. Indenting 8 characters is probably too much, makes it difficult to read. There are plenty of tools to reindent to a different level as we choose. Keep lines to less than 80 characters even though displays can now support much longer lines. It seems easier to read.

Preferred

window_delete <- function(action, window)
{
  if (action %in% c("quit", "ask"))
  {
    ans <- TRUE
    msg <- "Terminate?"
    if (! dialog(msg))
      ans <- TRUE
    else
      if (action == "quit")
        quit(save="no")
    else
      ans <- FALSE
  }
  return(ans)
}

Not Ideal

window_delete <- function(action, window)
{
            if (action %in% c("quit", "ask"))
            {
                        ans <- TRUE
                        msg <- "Terminate?"
                        if (! dialog(msg))
                                ans <- TRUE
                        else
                                if (action == "quit")
                                        quit(save="no")
                                else
                                        ans <- FALSE
            }
            return(ans)
}

Always use spaces rather than the invisible tab character.