johnw42

from itertools import takewhile
from typing import Iterable, Sequence, TypeVar

T = TypeVar("T")

def common_prefix(seqs: Iterable[Sequence[T]]) -> Iterable[T]:
    "Returns the common prefix of a sequence of sequences."
    return (c[0] for c in takewhile(lambda x: all(x[0] == y for y in x), zip(*seqs)))

johnw42

;;;###autoload
(defun before-compile-hook (&rest _)
  "Saves the current buffer if it is associated with a file."
  (interactive)
  (when buffer-file-name
    (save-buffer)))

(provide 'before-compile-hook)