end_box <- function(width = getOption("width", 80)){
context <- rstudioapi::getActiveDocumentContext()
current_col <- context$selection[[1]]$range[[1]][[2]]
num_spaces <- width - current_col - 1
rstudioapi::insertText(location = context$selection[[1]]$range[[1]],
text = paste0(strrep(" ", num_spaces), "##"))
}
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