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25.1.1 ¥Ð¥Ã¥¯¥¢¥Ã¥×¥Õ¥¡¥¤¥ë¤ÎºîÀ®

Function: backup-buffer

¤³¤Î´Ø¿ô¤Ï¡¢É¬Íפʤé¤Ð¡¢¥«¥ì¥ó¥È¥Ð¥Ã¥Õ¥¡¤ÇˬÌ䤷¤Æ¤¤¤ë¥Õ¥¡¥¤¥ë¤Î ¥Ð¥Ã¥¯¥¢¥Ã¥×¤òºîÀ®¤¹¤ë¡£ ¥Ð¥Ã¥Õ¥¡¤ò½é¤á¤ÆÊݸ¤¹¤ë¤Þ¤¨¤Ësave-buffer¤¬¤³¤Î´Ø¿ô¤ò¸Æ¤Ó½Ð¤¹¡£

Variable: buffer-backed-up

¤³¤Î¥Ð¥Ã¥Õ¥¡¥í¡¼¥«¥ë¤ÊÊÑ¿ô¤Ï¡¢ Åö³º¥Ð¥Ã¥Õ¥¡¤Î¤â¤È¤ÇÅö³º¥Ð¥Ã¥Õ¥¡¤Î¥Õ¥¡¥¤¥ë¤Î ¥Ð¥Ã¥¯¥¢¥Ã¥×¤òºîÀ®ºÑ¤ß¤«¤É¤¦¤«¤òɽ¤¹¡£ nil°Ê³°¤Ç¤¢¤ì¤Ð¡¢¥Ð¥Ã¥¯¥¢¥Ã¥×¥Õ¥¡¥¤¥ë¤ÏºîÀ®ºÑ¤ß¤Ç¤¢¤ë¤³¤È¤òɽ¤¹¡£ ¤µ¤â¤Ê¤±¤ì¤Ð¡¢¡Ê¥Ð¥Ã¥¯¥¢¥Ã¥×¤¬¥ª¥ó¤Ë¤Ê¤Ã¤Æ¤¤¤ì¤Ð¡Ë¤Ä¤®¤ËÊݸ¤¹¤ë¤È¤­¤Ë ¥Õ¥¡¥¤¥ë¤Î¥Ð¥Ã¥¯¥¢¥Ã¥×¤òºîÀ®¤¹¤ë¤Ù¤­¤Ç¤¢¤ë¤³¤È¤òɽ¤¹¡£ ¤³¤ì¤Ï¹±µ×Ū¤Ë¥Ð¥Ã¥Õ¥¡¥í¡¼¥«¥ë¤Ç¤¢¤ê¡¢ kill-local-variables¤Ë¤è¤Ã¤ÆÊѹ¹¤µ¤ì¤Ê¤¤¡£

User Option: make-backup-files

¤³¤ÎÊÑ¿ô¤Ï¡¢¥Ð¥Ã¥¯¥¢¥Ã¥×¥Õ¥¡¥¤¥ë¤òºîÀ®¤¹¤ë¤«¤É¤¦¤«¤ò·èÄꤹ¤ë¡£ nil°Ê³°¤Ç¤¢¤ë¤È¡¢backup-inhibited¤¬nil¤Ê¤é¤Ð¡Ê²¼µ­»²¾È¡Ë Emacs¤Ï½é¤á¤ÆÊݸ¤¹¤ë¤È¤­¤Ë³Æ¥Õ¥¡¥¤¥ë¤Î¥Ð¥Ã¥¯¥¢¥Ã¥×¤òºîÀ®¤¹¤ë¡£

¤Ä¤®¤ÎÎã¤Ï¡¢rmail¤Î¥Ð¥Ã¥Õ¥¡¤Ç¤Î¤ßÊÑ¿ômake-backup-files¤ò Êѹ¹¤¹¤ëÊýË¡¤Ç¤¢¤ë¡£ ¤³¤ÎÊÑ¿ô¤ònil¤Ë¤¹¤ë¤È¡¢ Emacs¤Ï¤½¤ì¤é¤Î¥Õ¥¡¥¤¥ë¤Î¥Ð¥Ã¥¯¥¢¥Ã¥×¤òºîÀ®¤·¤Ê¤¯¤Ê¤ê¡¢ ¥Ç¥£¥¹¥¯¥¹¥Ú¡¼¥¹¤ÎÀáÌó¤Ë¤Ê¤ë¡£ ¡Ê¤³¤Î¥³¡¼¥É¤òÆÉ¼Ô¤Î¥Õ¥¡¥¤¥ë.emacs¤ËÆþ¤ì¤Æ¤â¤è¤¤¡£¡Ë

(add-hook 'rmail-mode-hook 
          (function (lambda ()
                      (make-local-variable 
                       'make-backup-files)
                      (setq make-backup-files nil))))
Variable: backup-enable-predicate

¤³¤ÎÊÑ¿ô¤ÎÃͤϡ¢¥Õ¥¡¥¤¥ë¤ò¥Ð¥Ã¥¯¥¢¥Ã¥×¤¹¤Ù¤­¤«¤É¤¦¤«¤ò·èÄꤹ¤ë ¤¿¤á¤ËÆÃÄê¤Î¾ìÌ̤ǸƤӽФµ¤ì¤ë´Ø¿ô¤Ç¤¢¤ë¡£ Åö³º´Ø¿ô¤Ï¡¢Ä´¤Ù¤ë¤Ù¤­¥Õ¥¡¥¤¥ë¤Î̾Á°¤ò°ú¿ô¤Ë¤È¤ë¡£ Åö³º´Ø¿ô¤¬nil¤òÊÖ¤¹¤È¡¢Åö³º¥Õ¥¡¥¤¥ë¤Î¥Ð¥Ã¥¯¥¢¥Ã¥×¤Ï¶Ø»ß¤Ç¤¢¤ë¡£ ¤µ¤â¤Ê¤±¤ì¤Ð¡¢ËÜÀá¤Î¾¤ÎÊÑ¿ô¤¬¡¢ ¥Ð¥Ã¥¯¥¢¥Ã¥×¤¹¤ë¤«¤É¤¦¤«¤ä¥Ð¥Ã¥¯¥¢¥Ã¥×ÊýË¡¤ò»ØÄꤹ¤ë¡£

¥Ç¥Õ¥©¥ë¥ÈÃͤϤĤ®¤Î¤È¤ª¤ê¤Ç¤¢¤ë¡£

(lambda (name)
  (or (< (length name) 5)
      (not (string-equal "/tmp/"
                         (substring name 0 5)))))
Variable: backup-inhibited

¤³¤ÎÊÑ¿ô¤¬nil°Ê³°¤Ç¤¢¤ë¤È¡¢¥Ð¥Ã¥¯¥¢¥Ã¥×¤ò¶Ø»ß¤¹¤ë¡£ ¤³¤ÎÊÑ¿ô¤Ï¡¢Ë¬Ì䤷¤¿¥Õ¥¡¥¤¥ë¤Î̾Á°¤ËÂФ¹¤ëbackup-enable-predicate¤Î ¸¡ºº·ë²Ì¤òµ­Ï¿¤·¤Æ¤¤¤ë¡£ ˬÌ䤷¤¿¥Õ¥¡¥¤¥ë¤Ë´ð¤Å¤¤¤Æ¥Ð¥Ã¥¯¥¢¥Ã¥×¤ò¶Ø»ß¤¹¤ë ¾¤Îµ¡¹½¤Ç¤â¤³¤ÎÊÑ¿ô¤ò»È¤¨¤ë¡£ ¤¿¤È¤¨¤Ð¡¢VC¤Ï¤³¤ÎÊÑ¿ô¤Ënil°Ê³°¤òÀßÄꤷ¡¢ ÈÇ´ÉÍý¥·¥¹¥Æ¥à¤Ç´ÉÍý¤µ¤ì¤Æ¤¤¤ë¥Õ¥¡¥¤¥ë¤ËÂФ·¤Æ¥Ð¥Ã¥¯¥¢¥Ã¥×¤ÎºîÀ®¤ò¶Ø»ß¤¹¤ë¡£

¤³¤ì¤Ï¹±µ×Ū¤Ë¥Ð¥Ã¥Õ¥¡¥í¡¼¥«¥ë¤Ç¤¢¤ê¡¢ ¥á¥¸¥ã¡¼¥â¡¼¥É¤òÊѹ¹¤·¤Æ¤âÃͤϼº¤ï¤ì¤Ê¤¤¡£ ¥á¥¸¥ã¡¼¥â¡¼¥É¤Ï¤³¤ÎÊÑ¿ô¤ËÀßÄꤹ¤ë¤Ù¤­¤Ç¤Ï¤Ê¤¯¡¢ ¤«¤ï¤ê¤Ë¡¢make-backup-files¤ËÀßÄꤹ¤ë¤Ù¤­¤Ç¤¢¤ë¡£