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Emacs keeps a flag called the modified flag for each buffer, to record
whether you have changed the text of the buffer. This flag is set to
t whenever you alter the contents of the buffer, and cleared to
nil when you save it. Thus, the flag shows whether there are unsaved
changes. The flag value is normally shown in the mode line (voir la section Variables Used in the Mode Line), and controls saving (voir la section Saving Buffers) and
auto-saving (voir la section Auto-Saving).
Some Lisp programs set the flag explicitly. For example, the function
set-visited-file-name sets the flag to t, because the text
does not match the newly-visited file, even if it is unchanged from the file
formerly visited.
The functions that modify the contents of buffers are described in @ref{Text}.
This function returns t if the buffer buffer has been modified
since it was last read in from a file or saved, or nil otherwise. If
buffer is not supplied, the current buffer is tested.
This function marks the current buffer as modified if flag is
non-nil, or as unmodified if the flag is nil.
Another effect of calling this function is to cause unconditional redisplay
of the mode line for the current buffer. In fact, the function
force-mode-line-update works by doing this:
(set-buffer-modified-p (buffer-modified-p)) |
Like set-buffer-modified-p, but does not force redisplay of mode
lines.
This command marks the current buffer as unmodified, and not needing to be
saved. If arg is non-nil, it marks the buffer as modified, so
that it will be saved at the next suitable occasion. Interactively,
arg is the prefix argument.
Don't use this function in programs, since it prints a message in the echo
area; use set-buffer-modified-p (above) instead.
This function returns buffer's modification-count. This is a counter
that increments every time the buffer is modified. If buffer is
nil (or omitted), the current buffer is used. The counter can wrap
around occasionally.
This function returns buffer's character-change modification-count.
Changes to text properties leave this counter unchanged; however, each time
text is inserted or removed from the buffer, the counter is reset to the
value that would be returned buffer-modified-tick. By comparing the
values returned by two buffer-chars-modified-tick calls, you can tell
whether a character change occurred in that buffer in between the calls. If
buffer is nil (or omitted), the current buffer is used.
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Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.