Change some instances of 'print $thing' to 'print $thing || ""', to

[sgt/puzzles] / puzzles.but

diff --git a/puzzles.but b/puzzles.but
index 5d110ca..6885740 100644 (file)
--- a/puzzles.but
+++ b/puzzles.but
@@ -30,7 +30,7 @@
 
 This is a collection of small one-player puzzle games.
 
-\copyright This manual is copyright 2004-2010 Simon Tatham. All rights
+\copyright This manual is copyright 2004-2012 Simon Tatham. All rights
 reserved. You may distribute this documentation under the MIT licence.
 See \k{licence} for the licence text in full.
 
@@ -2958,6 +2958,12 @@ indicating that you are sure the loop does not go through that edge.
 white clue has to be a corner, but don't yet know which way the corner
 turns, you might mark the one way it \e{can't} go with a cross.)
 
+Alternatively, use the cursor keys to move the cursor.  Use the Enter
+key to begin and end keyboard `drag' operations.  Use the Space key to
+cancel the drag.  Use Ctrl-arrowkey and Shift-arrowkey to simulate a
+left or right click, respectively, on the edge in the given direction
+relative to the cursor, i.e. to draw a segment or a cross.
+
 (All the actions described in \k{common-actions} are also available.)
 
 \H{pearl-parameters} \I{parameters, for Pearl}Pearl parameters
@@ -2975,7 +2981,7 @@ These parameters are available from the \q{Custom...} option on the
 
 \A{licence} \I{MIT licence}\ii{Licence}
 
-This software is \i{copyright} 2004-2010 Simon Tatham.
+This software is \i{copyright} 2004-2012 Simon Tatham.
 
 Portions copyright Richard Boulton, James Harvey, Mike Pinna, Jonas
 K\u00F6{oe}lker, Dariusz Olszewski, Michael Schierl, Lambros