docs: def hexdiff(x, y):
      """Show differences between 2 binary strings"""
      x = bytes_encode(x)[::-1]
      y = bytes_encode(y)[::-1]
      SUBST = 1
      INSERT = 1
      d = {(-1, -1): (0, (-1, -1))}
      for j in range(len(y)):
          d[-1, j] = d[-1, j - 1][0] + INSERT, (-1, j - 1)
      for i in range(len(x)):
          d[i, -1] = d[i - 1, -1][0] + INSERT, (i - 1, -1)
  
      for j in range(len(y)):
          for i in range(len(x)):
              d[i, j] = min((d[i - 1, j - 1][0] + SUBST * (x[i] != y[j]), (i - 1, j - 1)),  # noqa: E501
                            (d[i - 1, j][0] + INSERT, (i - 1, j)),
                            (d[i, j - 1][0] + INSERT, (i, j - 1)))
  
      backtrackx = []
      backtracky = []
      i = len(x) - 1
      j = len(y) - 1
      while not (i == j == -1):
          i2, j2 = d[i, j][1]
          backtrackx.append(x[i2 + 1:i + 1])
          backtracky.append(y[j2 + 1:j + 1])
          i, j = i2, j2
  
      x = y = i = 0
      colorize = {0: lambda x: x,
                  -1: conf.color_theme.left,
                  1: conf.color_theme.right}
  
      dox = 1
      doy = 0
      btx_len = len(backtrackx)
      while i < btx_len:
          linex = backtrackx[i:i + 16]
          liney = backtracky[i:i + 16]
          xx = sum(len(k) for k in linex)
          yy = sum(len(k) for k in liney)
          if dox and not xx:
              dox = 0
              doy = 1
          if dox and linex == liney:
              doy = 1
  
          if dox:
              xd = y
              j = 0
              while not linex[j]:
                  j += 1
                  xd -= 1
              print(colorize[doy - dox]("%04x" % xd), end=' ')
              x += xx
              line = linex
          else:
              print("    ", end=' ')
          if doy:
              yd = y
              j = 0
              while not liney[j]:
                  j += 1
                  yd -= 1
              print(colorize[doy - dox]("%04x" % yd), end=' ')
              y += yy
              line = liney
          else:
              print("    ", end=' ')
  
          print(" ", end=' ')
  
          cl = ""
          for j in range(16):
              if i + j < btx_len:
                  if line[j]:
                      col = colorize[(linex[j] != liney[j]) * (doy - dox)]
                      print(col("%02X" % orb(line[j])), end=' ')
                      if linex[j] == liney[j]:
                          cl += sane_color(line[j])
                      else:
                          cl += col(sane(line[j]))
                  else:
                      print("  ", end=' ')
                      cl += " "
              else:
                  print("  ", end=' ')
              if j == 7:
                  print("", end=' ')
  
          print(" ", cl)
  
          if doy or not yy:
              doy = 0
              dox = 1
              i += 16
          else:
              if yy:
                  dox = 0
                  doy = 1
              else:
                  i += 16