def banner(self, msg='', sep='\\', lead_lines=0, trail_lines=0):
msg = f"[{self.command}]{msg} "
c = 0
if len(msg) < tty_cols():
c = tty_cols() - len(msg)
for _ in range(lead_lines):
print()
print(f"{msg}{sep*c}")
for _ in range(trail_lines):
print()
def max_frets_on_screen():
''' calculates how may frets can be rendered without exceeding terminal size
will NOT go over MAX_FRETS
'''
frets = int(tty_cols() / (_NOTE_WIDTH + _FRET_WIDTH)) - 2
return frets if frets < MAX_FRETS else MAX_FRETS