Commit ec06459c authored by Jay Belanger's avatar Jay Belanger

(Undoing Mistakes): Mention that the undo list will be truncated when

Calc is quit.
(Customizing Calc): Mention `calc-undo-length'.
parent b159e5b0
2009-07-21 Jay Belanger <jay.p.belanger@gmail.com>
* calc.texi (Undoing Mistakes): Mention that the undo list will be
truncated when Calc is quit.
(Customizing Calc): Document `calc-undo-length'.
2009-07-20 Chong Yidong <cyd@stupidchicken.com>
* calc.texi (About This Manual): Don't mention chapter numbers in text.
......
......@@ -10280,10 +10280,13 @@ are removed or restored. If it was a ``store'' operation, you are
queried whether or not to restore the variable to its original value.
The @kbd{U} key may be pressed any number of times to undo successively
farther back in time; with a numeric prefix argument it undoes a
specified number of operations. The undo history is cleared only by the
@kbd{q} (@code{calc-quit}) command. (Recall that @kbd{C-x * c} is
synonymous with @code{calc-quit} while inside the Calculator; this
also clears the undo history.)
specified number of operations. When the Calculator is quit, as with
the @kbd{q} (@code{calc-quit}) command, the undo history will be
truncated to the length of the customizable variable
@code{calc-undo-length} (@pxref{Customizing Calc}), which by default
is @expr{100}. (Recall that @kbd{C-x * c} is synonymous with
@code{calc-quit} while inside the Calculator; this also truncates the
undo history.)
Currently the mode-setting commands (like @code{calc-precision}) are not
undoable. You can undo past a point where you changed a mode, but you
......@@ -35047,6 +35050,15 @@ as @samp{a/(b*c)}. If @code{calc-multiplication-has-precedence} is
of @code{calc-multiplication-has-precedence} is @code{t}.
@end defvar
@defvar calc-undo-length
The variable @code{calc-undo-length} determines the number of undo
steps that Calc will keep track of when @code{calc-quit} is called.
If @code{calc-undo-length} is a non-negative integer, then this is the
number of undo steps that will be preserved; if
@code{calc-undo-length} has any other value, then all undo steps will
be preserved. The default value of @code{calc-undo-length} is @expr{100}.
@end defvar
@node Reporting Bugs, Summary, Customizing Calc, Top
@appendix Reporting Bugs
2009-07-21 Jay Belanger <jay.p.belanger@gmail.com>
* calc/calc.el (calc-undo-length): New variable.
(calc-quit): Truncate rather than eliminate `calc-undo-list'.
2009-07-21 Richard Stallman <rms@gnu.org>
* files.el (auto-save-mode): Handle buffer-save-size = -2
......
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