The Beast of Torrack Moor
An interactive fiction by Linda Wright (2007) - the Inform 7 source text
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[ Adapted version of Locksmith by Emily Short. The behaviour has been modified so that opening/unlocking a door causes the player to move through it automatically. ]
Door navigation is a thing. Door navigation is either neutral, first going, first opening or first unlocking. Door navigation is neutral.
Before going through a closed public door (called the blocking door) (this is the opening doors before entering rule):
if the door navigation is neutral,
change door navigation to first going;
try opening the blocking door;
if the door navigation is first going,
change door navigation to neutral;
stop the action.
Before opening a closed public door (called the blocking door) (this is the unlocking before opening rule):
let the locking outcome be 0;
if the door navigation is neutral,
change the door navigation to first opening;
if the blocking door is locked begin;
silently try unlocking keylessly the blocking door.
change locking outcome to 1;
end if;
if the blocking door is locked, stop the action;
now the blocking door is open;
say "[if the locking outcome is 1]Unlocking the door with the correct key, you push it[otherwise]You push the door[end if] open and go in.";
try going the blocking door;
if the door navigation is first opening,
change door navigation to neutral;
stop the action.
Instead of unlocking a locked closed public door (called the blocking door) with something when the door navigation is neutral:
change the door navigation to first unlocking;
try opening the blocking door;
change the door navigation to neutral.