Underline non-breaking space instead of rendering as '&'.

Author: jonathanslenders

prompt_toolkit/layout/screen.py

@@ -100,14 +100,21 @@ class Char(object):
  '\x9e': '<9e>',
  '\x9f': '<9f>',
 
- '\xa0': '&', # Non breaking space.
+ # For the non-breaking space: visualize like Emacs does by default.
+ # (Print a space, but attach the 'nbsp' class that applies the
+ # underline style.)
+ '\xa0': ' ',
  }
 
  def __init__(self, char=' ', style=''):
  # If this character has to be displayed otherwise, take that one.
  if char in self.display_mappings:
+ if char == '\xa0':
+ style += ' class:nbsp ' # Will be underlined.
+ else:
+ style += ' class:control-character '
+
  char = self.display_mappings[char]
- style += 'class:control-character'
 
  self.char = char
  self.style = style

prompt_toolkit/styles/defaults.py

@@ -106,6 +106,9 @@
  # Control characters, like ^C, ^X.
  ('control-character', 'ansiblue'),
 
+ # Non-breaking space.
+ ('nbsp', 'underline ansiyellow'),
+
  # Default styling of HTML elements.
  ('i', 'italic'),
  ('u', 'underline'),