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Timestamp fixes for undo.

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* doc/lispref/text.texi (Undo):
Document (t . 0) and (t . -1) in buffer-undo-list.
* etc/NEWS: Changes to visited-file-modtime, set-visited-file-modtime.
* lisp/files.el (clear-visited-file-modtime): Move here from fileio.c.
* src/atimer.c (schedule_atimer):
* src/fileio.c (Ffile_newer_than_file_p):
Minor cleanup: use EMACS_TIME_LT so that we can remove EMACS_TIME_GT.
* src/buffer.c (buffer-undo-list): Document (t . 0) and (t . -1).
* src/fileio.c (Fclear_visited_file_modtime): Move to lisp/files.el.
(syms_of_fileio): Remove Sclear_visited_file_name.
(Fvisited_file_modtime): Return -1, not (-1 ...), when the visited
file doesn't exist; this avoids an ambiguity with negative timestamps.
(Fset_visited_file_modtime): Accept -1 and 0 as time-list arg.
* src/systime.h (make_emacs_time, invalid_emacs_time):
Don't assume struct timespec layout; POSIX doesn't guarantee it.
(EMACS_TIME_NE, EMACS_TIME_GT, EMACS_TIME_GE): Remove.
* src/undo.c (record_first_change): Push (visited-file-modtime) onto
undo list rather than reimplementing it by hand, incorrectly.

Fixes: debbugs:14824
This commit is contained in:
Paul Eggert 2013-07-09 23:26:23 -07:00
parent 56973319b5
commit 954b166e90
12 changed files with 86 additions and 53 deletions
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5
lisp/files.el
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@ -4918,6 +4918,11 @@ change the additional actions you can take on files."
(length autosaved-buffers)
(mapconcat 'identity autosaved-buffers ", "))))))))
(defun clear-visited-file-modtime ()
"Clear out records of last mod time of visited file.
Next attempt to save will certainly not complain of a discrepancy."
(set-visited-file-modtime 0))
(defun not-modified (&optional arg)
"Mark current buffer as unmodified, not needing to be saved.
With prefix ARG, mark buffer as modified, so \\[save-buffer] will save.