Recompute text.has_bright when num_colors changes

The number of simultaneous colors in the current terminal are queried
later during initialization and the text.num_colors attribute is updated accordingly.
The text.has_bright attribute wasn't updated when that happened and always
remained set to False. Calculate those properties based on num_colors dynamically.

Author: peace-maker

pwnlib/term/text.py

@@ -28,8 +28,6 @@ def __init__(self):
         self.__file__ = __file__
         self.__name__ = __name__
         self.num_colors = 8
-        self.has_bright = self.num_colors >= 16
-        self.has_gray = self.has_bright
         self.when = 'auto'
         self._colors = {
             'black': 0,
@@ -61,6 +59,14 @@ def when(self):
     def when(self, val):
         self._when = eval_when(val)
 
+    @property
+    def has_bright(self):
+        return self.num_colors >= 16
+    
+    @property
+    def has_gray(self):
+        return self.has_bright
+
     def _fg_color(self, c):
         c = termcap.get('setaf', c) or termcap.get('setf', c)
         if not hasattr(c, 'encode'):