code: def log(s, header='', file=sys.stderr, nl=1, **kwargs):
      
      # Sanity check: If we are not in verbose mode, this is a no-op.
      if not settings.verbose:
          return
  
      # Construct multi-line string to stderr if header is provided.
      if header:
          word_arr = s.split(' ')
          multi = []
          word_arr.insert(0, '%s:' % header.upper())
          i = 0
          while i < len(word_arr):
              to_add = ['***']
              count = 3
              while count <= 79:
                  count += len(word_arr[i]) + 1
                  if count <= 79:
                      to_add.append(word_arr[i])
                      i += 1
                      if i == len(word_arr):
                          break
              # Handle corner case of extra-long word longer than 75 characters.
              if len(to_add) == 1:
                  to_add.append(word_arr[i])
                  i += 1
              if i != len(word_arr):
                  count -= len(word_arr[i]) + 1
              to_add.append('*' * (78 - count))
              multi.append(' '.join(to_add))
          s = '\n'.join(multi)
          lines = len(multi)
      else:
          lines = 1
  
      # If `nl` is an int greater than the number of rows of a message,
      # add the appropriate newlines to the output.
      if isinstance(nl, int) and nl > lines:
          s += '\n' * (nl - lines)
  
      # Output to stderr.
      return secho(s, file=file, **kwargs)
docs: Log the given output to stderr if and only if we are in
      verbose mode.
  
      If we are not in verbose mode, this is a no-op.