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#' @importFrom tools R_user_dir
#' @export
#' @title manage font working directory
#' @description Initialize or remove font directory used
#' to store downloaded font files.
#'
#' This directory is managed by R function [R_user_dir()] but can also
#' be defined in a non-user location by setting ENV variable `GDTOOLS_CACHE_DIR`
#' or by setting R option `GDTOOLS_CACHE_DIR`.
#'
#' Its value can be read with the `fonts_cache_dir()` function.
#'
#' The directory can be deleted with `rm_fonts_cache()` and
#' created with `init_fonts_cache()`.
#' @family functions for font management
#' @examples
#' fonts_cache_dir()
#'
#' options(GDTOOLS_CACHE_DIR = tempdir())
#' fonts_cache_dir()
#' options(GDTOOLS_CACHE_DIR = NULL)
#'
#' Sys.setenv(GDTOOLS_CACHE_DIR = tempdir())
#' fonts_cache_dir()
#' Sys.setenv(GDTOOLS_CACHE_DIR = "")
#'
#'
#'
#' init_fonts_cache()
#' dir.exists(fonts_cache_dir())
#'
#' rm_fonts_cache()
#' dir.exists(fonts_cache_dir())
fonts_cache_dir <- function() {
if (dir.exists(Sys.getenv("GDTOOLS_CACHE_DIR"))) {
dir <- Sys.getenv("GDTOOLS_CACHE_DIR")
} else if (!is.null(getOption("GDTOOLS_CACHE_DIR")) && dir.exists(getOption("GDTOOLS_CACHE_DIR"))) {
dir <- getOption("GDTOOLS_CACHE_DIR")
} else {
dir <- R_user_dir(package = "gdtools", which = "data")
}
if (is.null(getOption("GFONTS_DOWNLOAD_SLEEPTIME"))) {
options(GFONTS_DOWNLOAD_SLEEPTIME = 1)
}
dir
}
#' @title dummy 'Google Fonts' cache
#' @description dummy 'Google Fonts' cache
#' used for examples.
#' @export
#' @keywords internal
dummy_setup <- function() {
options(GDTOOLS_CACHE_DIR = file.path(tempdir(), "GDTOOLS_CACHE_DIR"))
dir.create(getOption("GDTOOLS_CACHE_DIR"), recursive = TRUE, showWarnings = TRUE)
fonts_cache_dir()
}
user_cache_exists <- function() {
fonts_cache_dir() == R_user_dir(package = "gdtools", which = "data")
}
#' @export
#' @rdname fonts_cache_dir
rm_fonts_cache <- function() {
dir <- fonts_cache_dir()
unlink(dir, recursive = TRUE, force = TRUE)
}
#' @export
#' @rdname fonts_cache_dir
init_fonts_cache <- function() {
rm_fonts_cache()
dir.create(fonts_cache_dir(), showWarnings = FALSE, recursive = TRUE)
liberationsans_to_cache()
fonts_cache_dir()
}
css_filepath <- function(id) {
file.path(css_dir(id = id), paste0(id, ".css"))
}
css_dir <- function(id) {
file.path(fonts_cache_dir(), id, "css")
}
font_dir <- function(id) {
file.path(fonts_cache_dir(), id, "fonts")
}
reduce_faces <- function(variants) {
faces <- c(
plain = "regular",
italic = "italic",
bold = "700",
bolditalic = "700italic"
)
faces <- faces[faces %in% variants]
faces <- faces[!is.na(faces)]
faces
}
font_to_cache <- function(family, faces = NULL, subset = c("latin", "latin-ext")) {
stopifnot(`'family' is expected to be a character value` = is.character(family), `family is expected to be a single value` = length(family) == 1L)
x <- gfonts_summary()
if (!family %in% x$family) {
stop("family ", shQuote(family), " is not in the fonts provided by 'google fonts'.")
}
font_id <- x[x$family %in% family, ]$id
css_file <- css_filepath(id = font_id)
if (file.exists(css_file)) {
return(TRUE)
}
check_gfonts(errors = TRUE)
if (is.null(faces)) {
faces <- reduce_faces(x[x$id %in% font_id, ]$variants[[1]])
}
subsets <- intersect(x[x$id %in% font_id, ]$subsets[[1]], subset)
.font_dir <- font_dir(id = font_id)
.css_dir <- css_dir(id = font_id)
dir.create(.font_dir, recursive = TRUE, showWarnings = FALSE)
dir.create(.css_dir, recursive = TRUE, showWarnings = FALSE)
gfonts::download_font(
id = font_id,
subsets = paste0(subsets, collapse = ","),
variants = faces,
output_dir = .font_dir
)
Sys.sleep(getOption("GFONTS_DOWNLOAD_SLEEPTIME"))
gfonts::generate_css(
prefer_local_source = FALSE,
browser_support = "best",
subsets = paste0(subsets, collapse = ","),
id = font_id,
variants = faces,
font_dir = "../fonts/",
output = css_file
)
# drop IE support as it generates issues - enough with IE8
css_str <- readLines(css_file, encoding = "UTF-8")
css_str <- css_str[!grepl("/* IE6-IE8 */", css_str, fixed = TRUE)]
writeLines(css_str, css_file, useBytes = TRUE)
TRUE
}
## gfonts_summary -----
gfonts_summary <- function() {
all_gfonts
}
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