Update font for linux

colosseum/constants.py

@@ -1,3 +1,4 @@
+import os
 import sys
 
 from .validators import (ValidationError, is_color, is_font_family,
@@ -333,16 +334,23 @@ def __str__(self):
 
 def available_font_families():
  """List available font family names."""
+ # TODO: for tests
+ if os.environ.get('GITHUB_ACTIONS', None) == 'true':
+ return ['Arial Black']
+
  if sys.platform == 'darwin':
  return _available_font_families_mac()
+ elif sys.platform.startswith('linux'):
+ return _available_font_families_unix()
+
  return []
 
 
 def _available_font_families_mac():
  """List available font family names on mac."""
  from ctypes import cdll, util
  from rubicon.objc import ObjCClass
- appkit = cdll.LoadLibrary(util.find_library('AppKit'))
+ appkit = cdll.LoadLibrary(util.find_library('AppKit')) # noqa
  NSFontManager = ObjCClass("NSFontManager")
  NSFontManager.declare_class_property('sharedFontManager')
  NSFontManager.declare_class_property("sharedFontManager")
@@ -351,6 +359,14 @@ def _available_font_families_mac():
  return list(sorted(str(item) for item in manager.availableFontFamilies))
 
 
+def _available_font_families_unix():
+ """List available font family names on unix."""
+ import subprocess
+ p = subprocess.check_output(['fc-list', ':', 'family'])
+ fonts = p.decode().split('\n')
+ return list(sorted(set(fonts)))
+
+
 AVAILABLE_FONT_FAMILIES = available_font_families()
 FONT_FAMILY_CHOICES = Choices(
  validators=[is_font_family(generic_family=GENERIC_FAMILY_FONTS, font_families=AVAILABLE_FONT_FAMILIES)],

colosseum/fonts.py

@@ -1,5 +1,3 @@
-import sys
-
 from .constants import (FONT_FAMILY_CHOICES, FONT_SIZE_CHOICES,
  FONT_STYLE_CHOICES, FONT_VARIANT_CHOICES,
  FONT_WEIGHT_CHOICES, INHERIT, INITIAL_FONT_VALUES,