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keep_empty <- function(fun) {
function(x) {
ret <- rep_along(x, "")
update <- which(is.na(x) | x != "")
ret[update] <- fun(x[update])
ret
}
}
#' Styling helpers
#'
#' Functions that allow implementers of formatters for custom data types to
#' maintain a consistent style with the default data types.
#'
#' `style_subtle()` is affected by the `pillar.subtle` option.
#'
#' @param x The character vector to style.
#' @export
#' @seealso [pillar-package] for a list of options
#' @examples
#' style_subtle("text")
style_subtle <- keep_empty(function(x) {
force(x)
if (isTRUE(getOption("pillar.subtle", TRUE))) {
crayon_grey_0.6(x)
} else {
x
}
})
#' @rdname style_subtle
#' @details
#' `style_subtle_num()` is affected by the `pillar.subtle_num` option, which is
#' `FALSE` by default.
#'
#' @export
#' @examples
#' style_subtle_num(0.01 * 1:3, c(TRUE, FALSE, TRUE))
style_subtle_num <- function(x, negative) {
if (isTRUE(getOption("pillar.subtle_num", FALSE))) {
style_subtle(x)
} else {
ifelse(negative, style_neg(x), x)
}
}
style_hint <- keep_empty(function(x) {
force(x)
if (isTRUE(getOption("pillar.subtle", TRUE))) {
crayon_grey_0.8(x)
} else {
x
}
})
style_spark_na <- function(x) {
crayon_yellow(x)
}
#' @details
#' `style_bold()` is affected by the `pillar.bold` option.
#'
#' @rdname style_subtle
#' @export
#' @examples
#' style_bold("Petal.Width")
style_bold <- function(x) {
if (isTRUE(getOption("pillar.bold", FALSE))) {
crayon_bold(x)
} else {
x
}
}
#' @rdname style_subtle
#' @export
#' @examples
#' style_na("NA")
style_na <- function(x) {
crayon_red(x)
}
#' @details
#' `style_neg()` is affected by the `pillar.neg` option.
#'
#' @rdname style_subtle
#' @export
#' @examples
#' style_neg("123")
style_neg <- keep_empty(function(x) {
if (isTRUE(getOption("pillar.neg", TRUE))) {
crayon_red(x)
} else {
x
}
})
pillar_na <- function(use_brackets_if_no_color = FALSE) {
if (use_brackets_if_no_color && !has_color()) {
"<NA>"
} else {
style_na("NA")
}
}
style_list <- function(x) {
style_subtle(x)
}
# Only check if we have color support once per session
has_color <- local({
has_color <- NULL
function(forget = FALSE) {
if (is.null(has_color) || forget) {
has_color <<- crayon::has_color()
}
has_color
}
})
# Important to use 16-color palette for consistent testing
is_testing <- local({
is_testing <- FALSE
function(set = NA) {
if (!is.na(set)) {
is_testing <<- set
}
is_testing
}
})
# Crayon functions call crayon::has_color() every call
make_style_fast <- function(...) {
# Force has_color to be true when making styles
old <- options(crayon.enabled = TRUE)
on.exit(options(old))
style <- crayon::make_style(...)
start <- stats::start(style)
finish <- crayon::finish(style)
function(...) {
if (has_color()) {
paste0(start, ..., finish)
} else {
paste0(...)
}
}
}
make_style_fast_16 <- function(...) {
# Force has_color to be true when making styles
old <- options(crayon.enabled = TRUE)
on.exit(options(old))
style <- crayon::make_style(...)
start <- stats::start(style)
finish <- crayon::finish(style)
style_16 <- crayon::make_style(..., colors = 16)
start_16 <- stats::start(style_16)
finish_16 <- crayon::finish(style_16)
function(...) {
if (has_color()) {
if (is_testing()) {
paste0(start_16, gsub(finish_16, start_16, ..., fixed = TRUE), finish_16)
} else {
paste0(start, gsub(finish, start, ..., fixed = TRUE), finish)
}
} else {
paste0(...)
}
}
}
# Placeholders, assigned in .onLoad()
crayon_underline <- function(...) {}
crayon_italic <- function(...) {}
crayon_red <- function(...) {}
crayon_yellow <- function(...) {}
crayon_bold <- function(...) {}
crayon_grey_0.6 <- function(...) {}
crayon_grey_0.8 <- function(...) {}
assign_crayon_styles <- function() {
crayon_underline <<- make_style_fast("underline")
crayon_italic <<- make_style_fast("italic")
crayon_red <<- make_style_fast("red")
crayon_yellow <<- make_style_fast("yellow")
crayon_bold <<- make_style_fast("bold")
crayon_grey_0.6 <<- make_style_fast_16(grDevices::grey(0.6), grey = TRUE)
crayon_grey_0.8 <<- make_style_fast_16(grDevices::grey(0.8), grey = TRUE)
}
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