Fontim, cross platform font path finding in Nim

fontim.nim

import os, strformat, options
## Get the locations(paths) of a given `font` in a string

func getFontsDir(): seq[string] =
  when defined(windows):
    # TODO use winim to get Windows installation location
    result = @[r"C:\Windows\Fonts\"]
  elif defined(macosx):
    result = @[r"/Library/Fonts"]
  elif defined(linux):
    # Might also be possible to leverage libfontconfig here
    result = @[
    "/usr/share/fonts/truetype/",
    "/usr/share/fonts/TTF/",
    "/usr/share/fonts/"
    ]

proc getFontPath*(name: string, slant = "Sans", suffix = "-Regular"): Option[string] =
  ## Returns the path of a font
  let 
    fontDir = getFontsDir()
    fontName = fmt"{name}{slant}{suffix}.ttf"

  for dir in fontDir:
    # Iterate over all the files in the font directories
    for filePath in dir.walkDirRec:
      echo filePath.extractFilename
      # Check if the filename matches, if so we found our font file!
      if filePath.extractFilename == fontName: 
        echo filePath
        return some(filePath)


  # In case we didn't find anything
  result = none[string]()

test_fontim.nim

# To run these tests, simply execute `nimble test`.
import unittest, options
import fontim

test "finds Noto Regular":
  assert getFontPath("Noto") == some("/usr/share/fonts/truetype/noto/NotoSans-Regular.ttf")

test "find IBM Plex Mono Bold":
  assert getFontPath(name = "IBMPlex", slant= "Mono", suffix="-Bold") == some("/usr/share/fonts/truetype/ibm-plex/IBMPlexMono-Bold.ttf")