New puzzle: Loopy', an implementation of Nikoli's Slither Link' or

`Loop the Loop' puzzle. Contributed by Mike Pinna.

[originally from svn r6211]

CHECKLST.txt

@@ -12,6 +12,10 @@ Add it to Recipe in _four_ places:
  - as a Windows build target
  - in the Unix `make install' section at the bottom.
 
+If the puzzle is by a new author, modify the copyright notice in
+LICENCE and in puzzles.but. (Also in index.html, but that's listed
+below under website changes.)
+
 Add it to list.c so that the OS X binary will be able to select it
 from the menus. (Also, double-check that the game structure name in
 the source file has been renamed from `nullgame'. Actually compiling
@@ -30,6 +34,8 @@ Don't forget to `svn add' the new source file before checkin!
 Put the puzzle on the web:
  - make a screenshot
  - add an entry in the puzzles list in index.html
+ - adjust the copyright in index.html if the puzzle is by a new
+   author
  - add a link to the Windows binary
  - make sure the Windows binary link points at the right binary, not
    the wrong one!

LICENCE

@@ -1,6 +1,6 @@
 This software is copyright (c) 2004-2005 Simon Tatham.
 
-Portions copyright Richard Boulton and James Harvey.
+Portions copyright Richard Boulton, James Harvey and Mike Pinna.
 
 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation files

Recipe

@@ -24,10 +24,11 @@ PEGS     = pegs tree234
 UNTANGLE = untangle tree234
 SLANT    = slant dsf
 MAP      = map dsf
+LOOPY    = loopy tree234 dsf
 
 ALL      = list NET NETSLIDE cube fifteen sixteen rect pattern solo twiddle
          + MINES samegame FLIP guess PEGS dominosa UNTANGLE blackbox SLANT
-         + lightup MAP
+         + lightup MAP LOOPY
 
 GTK      = gtk printing ps
 
@@ -51,6 +52,7 @@ blackbox : [X] GTK COMMON blackbox
 slant    : [X] GTK COMMON SLANT
 lightup  : [X] GTK COMMON lightup
 map      : [X] GTK COMMON MAP
+loopy    : [X] GTK COMMON LOOPY
 
 # Auxiliary command-line programs.
 solosolver :    [U] solo[STANDALONE_SOLVER] malloc
@@ -85,6 +87,7 @@ blackbox : [G] WINDOWS COMMON blackbox
 slant    : [G] WINDOWS COMMON SLANT
 lightup  : [G] WINDOWS COMMON lightup
 map      : [G] WINDOWS COMMON MAP
+loopy    : [G] WINDOWS COMMON LOOPY
 
 # Mac OS X unified application containing all the puzzles.
 Puzzles  : [MX] osx osx.icns osx-info.plist COMMON ALL
@@ -177,7 +180,7 @@ install:
 	for i in cube net netslide fifteen sixteen twiddle \
 	         pattern rect solo mines samegame flip guess \
 		 pegs dominosa untangle blackbox slant lightup \
-		 map; do \
+		 map loopy; do \
 		$(INSTALL_PROGRAM) -m 755 $$i $(DESTDIR)$(gamesdir)/$$i; \
 	done
 !end

list.c

@@ -24,6 +24,7 @@ extern const game fifteen;
 extern const game flip;
 extern const game guess;
 extern const game lightup;
+extern const game loopy;
 extern const game map;
 extern const game mines;
 extern const game net;
@@ -46,6 +47,7 @@ const game *gamelist[] = {
     &flip,
     &guess,
     &lightup,
+    &loopy,
     &map,
     &mines,
     &net,

puzzles.but

@@ -1642,11 +1642,71 @@ regions. However, it will always be possible without having to
 guess or backtrack.
 
 
+\C{loopy} \i{Loopy}
+
+\cfg{winhelp-topic}{games.loopy}
+
+You are given a grid of dots. Your aim is to draw a single unbroken
+loop from dot to dot within the grid.
+
+Some of the square spaces between the dots contain numbers. These
+numbers indicate how many of the four edges of that square are part
+of the loop. The loop you draw must correctly satisfy all of these
+clues to be considered a correct solution.
+
+Credit for this puzzle goes to \i{Nikoli} \k{nikoli-loopy}.
+
+Loopy was contributed to this collection by Mike Pinna.
+
+\B{nikoli-loopy}
+\W{http://www.nikoli.co.jp/puzzles/3/index-e.htm}\cw{http://www.nikoli.co.jp/puzzles/3/index-e.htm}
+(beware of Flash)
+
+
+\H{loopy-controls} \i{Loopy controls}
+
+\IM{Loopy controls} controls, for Loopy
+\IM{Loopy controls} keys, for Loopy
+\IM{Loopy controls} shortcuts (keyboard), for Loopy
+
+Click the left mouse button between two dots to add a line segment
+connecting them. Click again to remove that line segment.
+
+If you are sure that a particular line segment is \e{not} part of
+the loop, you can click the right mouse button to add a small cross
+indicating this. Click again to remove the cross.
+
+
+\H{loopy-parameters} \I{parameters, for Loopy}Loopy parameters
+
+These parameters are available from the \q{Custom...} option on the
+\q{Type} menu.
+
+\dt \e{Width}, \e{Height}
+
+\dd Size of grid in squares.
+
+\dt \e{Recursion depth}
+
+\dd Determines how much guesswork and backtracking you will need to
+do to solve the puzzle. When this is set to zero (as it is for all
+of the \q{Easy} options in the menu), you should always be able to
+deduce the state of an edge without having to guess. If you increase
+it, you will have to guess more and more.
+
+\lcont{
+
+Setting a high value for this option is liable to consume a lot of
+CPU time and memory. Be warned!
+
+}
+
+
 \A{licence} \I{MIT licence}\ii{Licence}
 
 This software is \i{copyright} 2004-2005 Simon Tatham.
 
-Portions copyright Richard Boulton and James Harvey.
+Portions copyright Richard Boulton, James Harvey and Mike Pinna.
 
 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation files