Add is_monospace method.

Author: fabiocaccamo

README.md

@@ -70,6 +70,7 @@ with open("fonts/MyFont.ttf") as fh:
 -   [`get_vertical_metrics`](#get_vertical_metrics)
 -   [`get_weight`](#get_weight)
 -   [`get_width`](#get_width)
+-   [`is_monospace`](#is_monospace)
 -   [`is_static`](#is_static)
 -   [`is_variable`](#is_variable)
 -   [`rename`](#rename)
@@ -557,6 +558,17 @@ Gets the font width value and name.
 width = font.get_width()
 ```
 
+#### `is_monospace`
+```python
+"""
+Determines if the font is a monospace font.
+
+:returns: True if monospace font, False otherwise.
+:rtype: bool
+"""
+mono = font.is_monospace()
+```
+
 #### `is_static`
 ```python
 """

fontbro/font.py

@@ -1241,6 +1241,19 @@ def get_width(
         width["value"] = width_value
         return width
 
+    def is_monospace(
+        self,
+    ) -> bool:
+        """
+        Determines if the font is a monospace font.
+
+        :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
+
     def is_static(
         self,
     ) -> bool:

tests/test_monospace.py

@@ -0,0 +1,17 @@
+from tests import AbstractTestCase
+
+
+class MonospaceTestCase(AbstractTestCase):
+    """
+    This class describes a monospace test case.
+    """
+
+    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())
+        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:
+            self.assertTrue(font.is_monospace())