X-Git-Url: http://git.shiar.net/descalc.git/blobdiff_plain/b2aba05a22d1f4036008c2d12874ddc9eb98edc0..7d9af85556b0e64c70e3641764b7b49a306723f3:/28_undo.pm

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+# key bindings for DCT, by Shiar
+
+# 1.10.1 200410150000 - single-level undo from main
+#     .2 200410150045 - set initial value to prevent crash when no undos set
+
+use strict;
+use warnings;
+
+my $undo = [];
+
+push @{$hook{preaction}}, sub {
+	$undo = [@stack] if $_[0]>=0;  # type>=0 for stack-modifying operations
+}; # preaction
+
+$action{undo}  = [-1, sub { ($undo, @stack) = ([@stack], @$undo) }]; # undo/redo
+
+return {
+	author  => "Shiar",
+	title   => "simple undo",
+	version => "1.10.2",
+};
+