systemfonts is a package that locates installed fonts. It uses the system-native libraries on Mac (CoreText) and Linux (FontConfig), and uses Freetype to parse the fonts in the registry on Windows.
systemfonts is available from CRAN using install.packages('systemfonts'). It is however still under development and you can install the development version using devtools.
The main use of this package is to locate font files based on family and style:
library(systemfonts)
match_fonts('Avenir', italic = TRUE)
#> path index features
#> 1 /System/Library/Fonts/Avenir.ttc 1This function returns the path to the file holding the font, as well as the 0-based index of the font in the file.
It is also possible to get a data.frame of all available fonts:
system_fonts()
#> # A tibble: 843 × 9
#> path index name family style weight width italic monospace
#> <chr> <int> <chr> <chr> <chr> <ord> <ord> <lgl> <lgl>
#> 1 /System/Library/Fonts… 2 Rock… Rockw… Bold bold norm… FALSE FALSE
#> 2 /Users/thomas/Library… 0 Open… Open … Ligh… normal norm… TRUE FALSE
#> 3 /Users/thomas/Library… 0 Open… Open … Semi… semib… semi… TRUE FALSE
#> 4 /System/Library/Fonts… 0 Note… Notew… Light normal norm… FALSE FALSE
#> 5 /System/Library/Fonts… 1 Deva… Devan… Bold bold norm… FALSE FALSE
#> 6 /System/Library/Fonts… 0 Kann… Kanna… Regu… normal norm… FALSE FALSE
#> 7 /System/Library/Fonts… 0 Verd… Verda… Bold bold norm… FALSE FALSE
#> 8 /System/Library/Fonts… 8 Aria… Arial… Light light norm… FALSE FALSE
#> 9 /Users/thomas/Library… 0 Open… Open … Medi… medium norm… TRUE FALSE
#> 10 /System/Library/Fonts… 10 Appl… Apple… Thin thin norm… FALSE FALSE
#> # ℹ 833 more rowsFurther, you can query additional information about fonts and specific glyphs, if that is of interest using the font_info() and glyph_info() functions.
While getting this information in R is nice, the intended use is mostly through compiled code so that graphic devices can easily locate relevant font files etc.
In order to use functions from systemfonts in C(++) code your package should list systemfonts in the LinkingTo field in the DESCRIPTION file. Once this is done you can now #include <systemfonts.h> in your code and use the provided functions. Look into the inst/include/systemfonts.h file to familiarise yourself with the C API.
systemfonts will always try to find a font for you, even if none exist with the given family name or style. How it resolves this is system specific and should not be relied on, but it can be expected that a valid font file is always returned no matter the input.
A few special aliases exist that behaves predictably but system dependent:
"" 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)Please note that the ‘systemfonts’ project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.