Used is-legacy-terminal to widen early return

Author: adamlui

is-unicode-supported/pyproject.toml

@@ -20,6 +20,7 @@ license-files = [
 dependencies = [
     "blessed~=1.33.0",
     "colorama~=0.4.6 ; platform_system == 'Windows'",
+    "is-legacy-terminal~=1.0.0",
     "json5~=0.13.0",
 ]
 requires-python = ">=3.8,<4"

is-unicode-supported/src/is_unicode_supported/api.py

@@ -1,14 +1,14 @@
-import os, sys
+import sys
 
-import blessed
+import blessed, is_legacy_terminal
 
 def is_unicode_supported() -> bool:
     if hasattr(is_unicode_supported, '_cached'):
         return is_unicode_supported._cached
 
-    if sys.platform == 'win32' and not os.environ.get('WT_SESSION'):
+    if not is_legacy_terminal(): # type: ignore
         is_unicode_supported._cached = False
-        return False # legacy Win consoles don't suport wide chars
+        return False # legacy terminals don't suport wide chars
 
     # Measure rendered width of wide CJK char
     terminal = blessed.Terminal()