Return to userlock.el CVS log

Up to [CSRG BSD Unix] / 43BSD / contrib / emacs / lisp

Annotation of 43BSD/contrib/emacs/lisp/userlock.el, revision 1.1

1.1     ! root        1: ;; Copyright (C) 1985 Free Software Foundation
        !             2: 
        !             3: ;; This file is part of GNU Emacs.
        !             4: 
        !             5: ;; GNU Emacs is distributed in the hope that it will be useful,
        !             6: ;; but WITHOUT ANY WARRANTY.  No author or distributor
        !             7: ;; accepts responsibility to anyone for the consequences of using it
        !             8: ;; or for whether it serves any particular purpose or works at all,
        !             9: ;; unless he says so in writing.  Refer to the GNU Emacs General Public
        !            10: ;; License for full details.
        !            11: 
        !            12: ;; Everyone is granted permission to copy, modify and redistribute
        !            13: ;; GNU Emacs, but only under the conditions described in the
        !            14: ;; GNU Emacs General Public License.   A copy of this license is
        !            15: ;; supposed to have been given to you along with GNU Emacs so you
        !            16: ;; can know your rights and responsibilities.  It should be in a
        !            17: ;; file named COPYING.  Among other things, the copyright notice
        !            18: ;; and this notice must be preserved on all copies.
        !            19: 
        !            20: 
        !            21: (put 'file-locked 'error-conditions '(file-locked file-error error))
        !            22: 
        !            23: (defun ask-user-about-lock (fn opponent)
        !            24:   "Ask user what to do when he wants to edit FILE but it is locked by USER.
        !            25: This function has a choice of three things to do:
        !            26:   do (signal 'buffer-file-locked (list FILE USER))
        !            27:     to refrain from editing the file
        !            28:   return t (grab the lock on the file)
        !            29:   return nil (edit the file even though it is locked).
        !            30: You can rewrite it to use any criterion you like to choose which one to do."
        !            31:   (discard-input)
        !            32:   (save-window-excursion
        !            33:     (let (answer)
        !            34:       (while (null answer)
        !            35:        (message "%s is locking %s: action (s, q, p, ?)? :" opponent fn)
        !            36:        (let ((tem (let ((inhibit-quit t))
        !            37:                     (prog1 (downcase (read-char))
        !            38:                            (setq quit-flag nil)))))
        !            39:          (if (= tem help-char)
        !            40:              (ask-user-about-lock-help)
        !            41:            (setq answer (assoc tem '((?s . t)
        !            42:                                      (?q . yield)
        !            43:                                      (?\C-g . yield)
        !            44:                                      (?p . nil)
        !            45:                                      (?? . help))))
        !            46:            (cond ((null answer)
        !            47:                   (message "Please type q, s, or p; or ? for help")
        !            48:                   (sit-for 3))
        !            49:                  ((eq (cdr answer) 'help)
        !            50:                   (ask-user-about-lock-help)
        !            51:                   (setq answer nil))
        !            52:                  ((eq (cdr answer) 'yield)
        !            53:                   (signal 'file-locked (list "File is locked" fn opponent)))))))
        !            54:       (cdr answer))))
        !            55: 
        !            56: (defun ask-user-about-lock-help ()
        !            57:   (with-output-to-temp-buffer "*Help*"
        !            58:     (princ "It has been detected that you want to modify a file that someone else has
        !            59: already started modifying in EMACS.
        !            60: 
        !            61: You can steal the file (s); (S)he becomes the intruder if (s)he ever
        !            62:    unmodifies the file and tries again.
        !            63: You can proceed (p); you edit at your own (and his/her) risk.
        !            64: You can quit (q).")))

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.