Fix (trivial case of) comparison with boolean.

def fix_e712(self, result):
        """Fix (trivial case of) comparison with boolean."""
        (line_index, offset, target) = get_index_offset_contents(result,
                                                                 self.source)

        # Handle very easy "not" special cases.
        if re.match(r'^\s*if [\w."\'\[\]]+ == False:$', target):
            self.source[line_index] = re.sub(r'if ([\w."\'\[\]]+) == False:',
                                             r'if not \1:', target, count=1)
        elif re.match(r'^\s*if [\w."\'\[\]]+ != True:$', target):
            self.source[line_index] = re.sub(r'if ([\w."\'\[\]]+) != True:',
                                             r'if not \1:', target, count=1)
        else:
            right_offset = offset + 2
            if right_offset >= len(target):
                return []

            left = target[:offset].rstrip()
            center = target[offset:right_offset]
            right = target[right_offset:].lstrip()

            # Handle simple cases only.
            new_right = None
            if center.strip() == '==':
                if re.match(r'\bTrue\b', right):
                    new_right = re.sub(r'\bTrue\b *', '', right, count=1)
            elif center.strip() == '!=':
                if re.match(r'\bFalse\b', right):
                    new_right = re.sub(r'\bFalse\b *', '', right, count=1)

            if new_right is None:
                return []

            if new_right[0].isalnum():
                new_right = ' ' + new_right

            self.source[line_index] = left + new_right