Nothing
# nocov start
poll_progress <- function(futures, file, n_x) {
symbol <- get_progress_symbol()
prefix <- "Progress: "
suffix <- " 100%"
width_prefix <- nchar(prefix)
width_suffix <- nchar(suffix)
width_carriage <- 1L
stderr <- stderr()
while (any_running(futures)) {
con <- file(file, open = "r")
n_ticks <- get_n_ticks(con)
close(con)
# Console width might change while we poll
width_max <- console_width()
width_usable <- width_max - width_prefix - width_suffix - width_carriage
width_rule <- floor(width_usable * n_ticks / n_x)
width_space <- width_usable - width_rule
space <- paste0(rep(" ", times = width_space), collapse = "")
rule <- paste0(rep(symbol, times = width_rule), collapse = "")
out <- paste0(prefix, rule, space, suffix)
cat("\r", out, file = stderr)
utils::flush.console()
}
}
get_n_ticks <- function(con) {
line <- readLines(con, n = 1L, warn = FALSE)
if (length(line) == 0L) {
line <- ""
}
nchar(line)
}
any_running <- function(futures) {
!all(future::resolved(futures))
}
console_width <- function() {
width <- Sys.getenv("RSTUDIO_CONSOLE_WIDTH", getOption("width", 80))
as.integer(width)
}
# ------------------------------------------------------------------------------
# Adapted from cli's onload properties
# to dynamically switch depending on utf8 availability
get_progress_symbol <- function() {
if (is_utf8_output()) {
"\u2500"
} else {
"-"
}
}
is_utf8_output <- function() {
l10n_info()$`UTF-8` && !is_latex_output()
}
is_latex_output <- function () {
if (!("knitr" %in% loadedNamespaces())) {
return(FALSE)
}
get("is_latex_output", asNamespace("knitr"))()
}
# ------------------------------------------------------------------------------
assert_progress <- function(progress) {
if (!is_bool(progress)) {
abort("`.progress` must be a single logical value.")
}
invisible(progress)
}
# ------------------------------------------------------------------------------
# - Sequential blocks in the `future()` call, so no progress is ever shown
# - Cluster is generally used for multi-computer setups, and would end up
# writing into files on the remote workers, which would never be shown.
progress_enabled_plans <- c(
"multicore",
"multisession",
"multiprocess"
)
reconcile_progress_with_strategy <- function(progress) {
if (is_false(progress)) {
return(progress)
}
plan <- future::plan()
progress_enabled_plan <- inherits_any(plan, progress_enabled_plans)
if (!progress_enabled_plan) {
progress <- FALSE
}
progress
}
# nocov end
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