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progress.R
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progress.R
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#' Progress bar with estimated time.
#'
#' This reference class represents a text progress bar displayed estimated
#' time remaining. When finished, it displays the total duration.
#'
#' @param n Total number of
#' @param min_time Progress bar will wait until at least \code{min_time}
#' seconds have elapsed before displaying any results.
#' @return A ref class with methods \code{tick()}, \code{print()},
#' \code{pause()}, and \code{stop()}.
#' @keywords internal
#' @export
#' @examples
#' p <- progress_estimated(3)
#' p$tick()
#' p$tick()
#' p$tick()
#'
#' p <- progress_estimated(3)
#' for (i in 1:3) p$pause(0.1)$tick()$print()
#'
#' p <- progress_estimated(3)
#' p$tick()$print()$
#' pause(1)$stop()
#'
#' # If min_time is set, progress bar not shown until that many
#' # seconds have elapsed
#' p <- progress_estimated(3, min_time = 3)
#' for (i in 1:3) p$pause(0.1)$tick()$print()
#'
#' \dontrun{
#' p <- progress_estimated(10, min_time = 3)
#' for (i in 1:10) p$pause(0.5)$tick()$print()
#' }
progress_estimated <- function(n, min_time = 0) {
Progress$new(n, min_time = min_time)
}
Progress <- R6::R6Class("Progress",
public = list(
n = NULL,
i = 0,
init_time = NULL,
stopped = FALSE,
stop_time = NULL,
min_time = NULL,
initialize = function(n, min_time = 0, ...) {
self$n <- n
self$min_time <- min_time
self$begin()
},
begin = function() {
"Initialise timer. Call this before beginning timing."
self$i <- 0
self$init_time <- now()
self$stopped <- FALSE
self
},
pause = function(x) {
"Sleep for x seconds. Useful for testing."
Sys.sleep(x)
self
},
width = function() {
getOption("width") - nchar("|100% ~ 99.9 h remaining") - 2
},
tick = function() {
"Process one element"
if (self$stopped) return(self)
if (self$i == self$n) stop("No more ticks")
self$i <- self$i + 1
self
},
stop = function() {
if (self$stopped) return(self)
self$stopped <- TRUE
self$stop_time <- now()
self
},
print = function(...) {
if(!interactive() || !is.null(getOption('knitr.in.progress'))) {
return(invisible(self))
}
if (now() - self$init_time < self$min_time) {
return(invisible(self))
}
if (self$stopped) {
overall <- show_time(self$stop_time - self$init_time)
if (self$i == self$n) {
cat_line("Completed after ", overall)
cat("\n")
} else {
cat_line("Killed after ", overall)
cat("\n")
}
return(invisible(self))
}
avg <- (now() - self$init_time) / self$i
time_left <- (self$n - self$i) * avg
nbars <- trunc(self$i / self$n * self$width())
cat_line(
"|", str_rep("=", nbars), str_rep(" ", self$width() - nbars), "|",
format(round(self$i / self$n * 100), width = 3), "% ",
"~", show_time(time_left), " remaining"
)
invisible(self)
}
)
)
cat_line <- function(...) {
msg <- paste(..., sep = "", collapse = "")
gap <- max(c(0, getOption("width") - nchar(msg, "width")))
cat("\r", msg, rep.int(" ", gap), sep = "")
flush.console()
}
str_rep <- function(x, i) {
paste(rep.int(x, i), collapse = "")
}
show_time <- function(x) {
if (x < 60) {
paste(round(x), "s")
} else if (x < 60 * 60) {
paste(round(x / 60), "m")
} else {
paste(round(x / (60 * 60)), "h")
}
}
now <- function() proc.time()[[3]]