Editing Holiday lights


We put up some holiday lights in the Mission Street windows. (We call them Holiday Lights both as an ecumenical gesture of goodwill as well as to annoy the "War on Christmas" wingnuts.)

Naturally, you can control them on the web using the bare-bones interface at URL: http://lights.netisland.net:8080/

This is served by a pure Python webserver running on a Fit-PC Ubuntu micro-PC. 

Basic info:
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/home/lights/server/filelooop.py

		This is the script that runs forever, and does the Actual
		Work of switching the lights on and off.  It reads the
		file /home/lights/sequence, which defines the light
		sequence, and then uses the RelayControl class to
		communicate with the external relay bank.

	/home/lights/sequence

		The file read by filelooop.py that defines the light
		sequence currently active.  The first line of this file
		defines how long (in milliseconds) we should sleep before
		advancing to the next state.  The rest of the file is a
		list of states to iterate through.  For example:

			1000
			10000000
			01000000
			00100000
			00010000
			00001000
			00000100
			00000010
			00000001

		We sleep for 1 second (1000 milliseconds) between states.
		In the first state, the first light is on, and the rest
		are off.  In the second state, the second light is on, and
		the rest are off.  In the third state, the third light is
		on, and the rest are off.  etc.

		(There's code in place in filelooop.py to also support
		state lines in the syntax of "<state> <delay>", to sleep
		for an amount of time different than the "global delay",
		but I haven't actually tested this behavior yet.)

	/home/lights/*.seq

		A list of pre-programed sequences.

	/home/lights/server/webserver.py

		A full webserver/framework implementation, currently
		configured to listen on port 8080.  When you request "/",
		it returns a list of hyperlinks to each of the *.seq files
		in lights's home directory.  If you click on one of those
		links, it copies the contents from the *.seq file to
		/home/lights/sequence, so filelooop.py will start
		processing it instead of whatever it was previously
		processing.

	/home/lights/set.html

		When you use webserver.py to request a *.seq file, it
		returns the contents of /home/lights/set.html to the
		browser.  Right now, this file contains just
		"<h1>Thanks!</h1>".  We should make it look pretty, and
		probably also have a meta refresh to redirect the user
		back to / (the directory listing) after a few seconds,
		or something.

		If we want to get fancy, we should also look into using
		one of the python templating libraries, so we can have a
		static index.html page independent of the code, and then
		make that index.html file look pretty, too.  We just need
		to find out how to interpolate a list of files to display
		in he the directory listing.
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