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fonts.R
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fonts.R
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#' Get system dependent fallback font if a given font is not available
#'
#' This functions returns the system dependent font for the alias "sans".
#'
#' The aliases are mapped the following way:
#' * "" and "sans" return Helvetica on Mac, Arial on Windows, and the default sans-serif font on Linux (DejaVu Sans on Ubuntu)
#' * "serif" return Times on Mac, Times New Roman on Windows, and the default serif font on Linux (DejaVu Serif on Ubuntu)
#' * "mono" return Courier on Mac, Courier New on Windows, and the default mono font on Linux (DejaVu Mono on Ubuntu)
#' * "emoji" return Apple Color Emoji on Mac, Segoe UI Emoji on Windows, and the default emoji font on Linux (Noto Color on Ubuntu)
#'
#' See https://github.com/r-lib/systemfonts for details
#'
#' @param fonts Data frame obtained by `systemfonts::system_fonts`
#' @param fallback_alias Character, one of `c("sans", "serif", "mono", "emoji")`
#' defaults to "sans".
#'
#' @return Data frame obtained by `systemfonts::system_fonts` with one row
#' @export
#'
#' @examples
#' get_fallback_font_df()
get_fallback_font_df <- function(
fonts = systemfonts::system_fonts(),
fallback_alias = "sans"
) {
fallback_alias <- rlang::arg_match(
fallback_alias,
values = c(
"sans", "serif", "mono", "emoji"
)
)
fallback_font <- systemfonts::match_font(
fallback_alias
)
df_font <- fonts %>%
dplyr::filter(
tolower(
fs::path_file(
.data[["path"]]
)
) == tolower(
fs::path_file(
fallback_font[["path"]]
)
),
.data[["index"]] == 0L
) %>%
dplyr::slice_head(
n = 1L
)
return(df_font)
}
#' Get data frame of font information for a font file
#'
#' @param font_file Character, name of the font file (case insensitive)
#'
#' @return Data frame obtained by `systemfonts::system_fonts` with one row
#' @export
#'
#' @examples
#' get_font_df("RUB Scala TZ.ttf")
get_font_df <- function(
font_file = "RubFlama-Regular.ttf"
) {
fonts <- systemfonts::system_fonts()
df_font <- fonts %>%
dplyr::filter(
tolower(
fs::path_file(
.data[["path"]]
)
) == tolower(font_file),
.data[["index"]] == 0L
) %>%
dplyr::slice_head(
n = 1L
)
if(
nrow(df_font) == 0L
) {
df_font <- get_fallback_font_df(
fonts
)
font_name <- df_font[["name"]]
rlang::warn(
message = c(
"x" = glue::glue(
'Font file "{font_file}" could not be found'
),
"i" = glue::glue(
'Using fallback font "{font_name}" instead'
)
),
.frequency = "once",
.frequency_id = font_file
)
}
return(df_font)
}
#' Register font using `sysfonts::font_add` and `systemfonts::register_font`
#'
#' Registration with `sysfonts::font_add` exclusively works for `showtext`, while
#' `systemfonts::register_font` is required for the calculation of string widths, for instance.
#' The family name must be unique across the two registrations, so the `systemfonts` registration
#' uses a suffix behind the family name.
#'
#' @param font_df Data frame with one row obtained by `RUBer::get_font_df()`
#' @param systemfonts_suffix Suffix attached to the font family name in `systemfonts::register_font`
#'
#' @return Invisibly returns font family
#' @export
#'
#' @examples
#' register_font_df()
register_font_df <- function(
font_df = RUBer::get_font_df(),
systemfonts_suffix = "_systemfonts"
) {
font_family <- font_df[["family"]]
font_path <- font_df[["path"]]
font_file <- fs::path_file(
font_path
)
if(
font_file == "RubFlama-Regular.ttf"
) {
RUBer::register_font_flama()
} else if(
font_file == "RUB Scala TZ.ttf"
) {
RUBer::register_font_scala()
} else {
sysfonts::font_add(
family = font_family,
regular = font_path
)
systemfonts::register_font(
name = paste0(
font_family,
systemfonts_suffix
),
plain = font_path
)
}
return(
invisible(
font_family
)
)
}
#' Registers RUB Flama font to be used with the `showtext` and `systemfonts` packages
#'
#' @inheritParams register_font_df
#' @param family Character, font family, defaults to
#' `get_font_df()[["family"]]`
#' @param regular Character, path of the font file for "regular" font style
#' defaults to `get_font_df()[["path"]]`
#' @param bold Character, path of the font file for "bold" font style,
#' defaults to `get_font_df("RubFlama-Bold.ttf")[["path"]]`
#' @param italic Character, path of the font file for "italic" font style,
#' `get_font_df("RubFlama-Italic.ttf")[["path"]]`
#' @param bolditalic Character, path of the font file for "bold italic" font style,
#' defaults to `get_font_df("RubFlama-BoldItalic.ttf")[["path"]]`
#'
#' @return Side effects
#' @export
#'
#' @examples
#' register_font_flama()
register_font_flama <- function(
family = get_font_df()[["family"]],
regular = get_font_df()[["path"]],
bold = get_font_df("RubFlama-Bold.ttf")[["path"]],
italic = get_font_df("RubFlama-Italic.ttf")[["path"]],
bolditalic = get_font_df("RubFlama-BoldItalic.ttf")[["path"]],
systemfonts_suffix = "_systemfonts"
) {
sysfonts::font_add(
family = family,
regular = regular,
bold = bold,
italic = italic,
bolditalic = bolditalic
)
systemfonts::register_font(
name = paste0(
family,
systemfonts_suffix
),
plain = regular,
bold = bold,
italic = italic,
bolditalic = bolditalic
)
}
#' Registers RUB Scala TZ font to be used with `showtext` and `systemfonts` packages
#'
#' @inheritParams register_font_df
#' @param family Character, font family, defaults to
#' `get_font_df("RUB Scala TZ.ttf")[["family"]]`
#' @param regular Character, path of the font file for "regular" font style
#' defaults to `get_font_df("RUB Scala TZ.ttf")[["path"]]`
#' @param bold Character, path of the font file for "bold" font style,
#' defaults to `get_font_df("RUB Scala TZ Bold.ttf")[["path"]]`
#' @param italic Character, path of the font file for "italic" font style,
#' `get_font_df("RUB Scala TZ Italic.ttf")[["path"]]`
#' @param bolditalic Character, path of the font file for "bold italic" font style,
#' defaults to `get_font_df("RUB Scala TZ Bold Italic.ttf")[["path"]]`
#'
#' @return Side effects
#' @export
#'
#' @examples
#' register_font_scala()
register_font_scala <- function(
family = get_font_df("RUB Scala TZ.ttf")[["family"]],
regular = get_font_df("RUB Scala TZ.ttf")[["path"]],
bold = get_font_df("RUB Scala TZ Bold.ttf")[["path"]],
italic = get_font_df("RUB Scala TZ Italic.ttf")[["path"]],
bolditalic = get_font_df("RUB Scala TZ Bold Italic.ttf")[["path"]],
systemfonts_suffix = "_systemfonts"
) {
sysfonts::font_add(
family = family,
regular = regular,
bold = bold,
italic = italic,
bolditalic = bolditalic
)
systemfonts::register_font(
name = paste0(
family,
systemfonts_suffix
),
plain = regular,
bold = bold,
italic = italic,
bolditalic = bolditalic
)
}