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font-discovery

This is a library by @Shinmera to find out which fonts are known to OS and where their files are located.

Here is how you can list all “Arial” fonts and find where the “bold” version is located:

POFTHEDAY> (org.shirakumo.font-discovery:list-fonts :family "Arial")
(#<ORG.SHIRAKUMO.FONT-DISCOVERY:FONT "Arial" ROMAN REGULAR NORMAL>
 #<ORG.SHIRAKUMO.FONT-DISCOVERY:FONT "Arial" ITALIC REGULAR NORMAL>
 #<ORG.SHIRAKUMO.FONT-DISCOVERY:FONT "Arial" ROMAN BOLD NORMAL>
 #<ORG.SHIRAKUMO.FONT-DISCOVERY:FONT "Arial" ITALIC BOLD NORMAL>)

POFTHEDAY> (third *)
#<ORG.SHIRAKUMO.FONT-DISCOVERY:FONT "Arial" ROMAN BOLD NORMAL>

POFTHEDAY> (org.shirakumo.font-discovery:file *)
#P"/System/Library/Fonts/Supplemental/Arial Bold.ttf"

It is also possible to find a single font filtering it by family, slant and other parameters:

POFTHEDAY> (org.shirakumo.font-discovery:find-font :family "PragmataPro")
#<ORG.SHIRAKUMO.FONT-DISCOVERY:FONT "PragmataPro" ROMAN REGULAR NORMAL>

POFTHEDAY> (describe *)
#<ORG.SHIRAKUMO.FONT-DISCOVERY:FONT "PragmataPro" ROMAN REGULAR NORMAL>
  [standard-object]

Slots with :INSTANCE allocation:
  FILE                           = #P"/Users/art/Library/Fonts/PragmataProR_0828.ttf"
  FAMILY                         = "PragmataPro"
  SLANT                          = :ROMAN
  WEIGHT                         = :REGULAR
  SPACING                        = NIL
  STRETCH                        = :NORMAL

However, I found this library is still unstable on OSX and sometimes crashes somewhere in the CFFI code. @Shinmera has fixed some of these errors but some of them are still uncaught.

Read the full documentation on it here:

https://shinmera.github.io/font-discovery/