Add threshold option to is_monospace method.

README.md

@@ -585,6 +585,9 @@ width = font.get_width()
 """
 Determines if the font is a monospace font.
 
+:param threshold: The threshold (0.0 <= n <= 1.0) of glyphs with the same width to consider the font as monospace.
+:type threshold: float
+
 :returns: True if monospace font, False otherwise.
 :rtype: bool
 """

fontbro/font.py

@@ -5,6 +5,7 @@
 import re
 import sys
 import tempfile
+from collections import Counter
 from curses import ascii
 from io import BytesIO
 from pathlib import Path
@@ -1396,16 +1397,24 @@ def get_width(
 
     def is_monospace(
         self,
+        threshold: float = 0.85,
     ) -> bool:
         """
         Determines if the font is a monospace font.
 
+        :param threshold: The threshold (0.0 <= n <= 1.0) of glyphs with the same width to consider the font as monospace.
+        :type threshold: float
+
         :returns: True if monospace font, False otherwise.
         :rtype: bool
         """
         font = self.get_ttfont()
-        widths = {metrics[0] for metrics in font["hmtx"].metrics.values()}
-        return len(widths) == 1
+        widths = [metrics[0] for metrics in font["hmtx"].metrics.values()]
+        widths_counter = Counter(widths)
+        same_width_count = widths_counter.most_common(1)[0][1]
+        same_width_amount = same_width_count / self.get_glyphs_count()
+        print(same_width_amount)
+        return same_width_amount >= threshold
 
     def is_static(
         self,

tests/test_monospace.py

@@ -10,7 +10,7 @@ def test_is_monospace(self):
         with self._get_font("/Inter/static/Inter-Regular.ttf") as font:
             self.assertFalse(font.is_monospace())
         with self._get_font("/Noto_Sans_TC/NotoSansTC-Regular.otf") as font:
-            self.assertFalse(font.is_monospace())
+            self.assertTrue(font.is_monospace())
         with self._get_font("/Open_Sans/static/OpenSans-Regular.ttf") as font:
             self.assertFalse(font.is_monospace())
         with self._get_font("/Roboto_Mono/static/RobotoMono-Regular.ttf") as font: