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#' Use a package logo
#'
#' This function helps you use a logo in your package:
#' * Enforces a specific size
#' * Stores logo image file at `man/figures/logo.png`
#' * Produces the markdown text you need in README to include the logo
#'
#' @param img The path to an existing image file
#' @param geometry a [magick::geometry] string specifying size. The default
#' assumes that you have a hex logo using spec from
#' <http://hexb.in/sticker.html>.
#' @param retina `TRUE`, the default, scales the image on the README,
#' assuming that geometry is double the desired size.
#'
#' @examples
#' \dontrun{
#' use_logo("usethis.png")
#' }
#' @export
use_logo <- function(img, geometry = "240x278", retina = TRUE) {
check_is_package("use_logo()")
logo_path <- proj_path("man", "figures", "logo", ext = path_ext(img))
create_directory(path_dir(logo_path))
if (!can_overwrite(logo_path)) {
return(invisible(FALSE))
}
if (path_ext(img) == "svg") {
logo_path <- path("man", "figures", "logo.svg")
file_copy(img, proj_path(logo_path), overwrite = TRUE)
ui_done("Copied {ui_path(img)} to {ui_path(logo_path)}")
height <- as.integer(sub(".*x", "", geometry))
} else {
check_installed("magick")
img_data <- magick::image_read(img)
img_data <- magick::image_resize(img_data, geometry)
magick::image_write(img_data, logo_path)
ui_done("Resized {ui_path(img)} to {geometry}")
height <- magick::image_info(magick::image_read(logo_path))$height
}
pkg <- project_name()
if (retina) {
height <- round(height / 2)
}
ui_todo("Add logo to your README with the following html:")
pd_link <- pkgdown_url(pedantic = TRUE)
if (is.null(pd_link)) {
ui_code_block("# {pkg} <img src=\"{proj_rel_path(logo_path)}\" align=\"right\" height=\"{height}\" alt=\"\" />")
} else {
ui_code_block("# {pkg} <a href=\"{pd_link}\"><img src=\"{proj_rel_path(logo_path)}\" align=\"right\" height=\"{height}\" alt=\"{pkg} website\" /></a>")
}
}
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