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From: "Y. Wang" <yw05@forksworld.de>
Subject: Re: train.door_open documentation where?
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>> 1. What exactly do you want to work
>> on in Advtrains?
> 
> Door indexes.
> 
>> 2. Considering that you have decided
>> to work on Advtrains, why did you
>> not consider looking into the source
>> code and figuring it out yourself?
> 
> I did try to search but Windows
> Explorer can't really explore as well
> as it could, and i did mention that i
> searched bananach.space, more
> specifically for "door_open", which
> brought up nothing.

Why did you look at the commit log? Commit messages on Advtrains tend to 
be short, and implementation details are generally not described. It 
does not sound surprising to me at all that you did not find anything there.

Instead, I am quite sure that there is something sensible on Windows 
that is close to `grep -rn -C3` on Linux. IMO not being able to figure 
out how to search through a directory of text files is among the last 
reasons to not read the source code, and it is definitely not a reason 
if you want to actually work on Advtrains.

In any case, train.door_open is
* -1 if only the left door is open
* 0 if doors are closed
* 1 if only the right door is open

The direction is relative to the direction of the train.