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function video2Canvas(video, canvas) {
    var ctx = canvas.getContext('2d');
    function draw() {
        ctx.drawImage(video, 0, 0, video.width, video.height, 0, 0, canvas.width, canvas.height);
        requestAnimationFrame(draw);
    }
    requestAnimationFrame(draw);
}

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--EVAL "this script" 1 key_name new_item max_size
local key = KEYS[1];
local item, max = unpack(ARGV);
redis.call('RPUSH', key, item);
redis.call('LTRIM', key, -max, -1);

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/* mapReduce
 * arguments (
 *  lup: levelup instance,
 *  map: function ({key, value}) { return [{key: mapkey, value: mapvalue}, ...]; },
 *  reduce: function (mapkey, [mapvalue, ...]) { return reduced; },
 *  callback: function (err, {mapkey: reduced, ...})
 *  )
 *
 *  A map is called for each key pair. A map returns an array of key value pairs to be reduced.
 *  Key value pairs may be derived keys and values, or database keys and values.

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--EVAL 'this script' 1 some-key
local key = KEYS[1];
local value = redis.call('GET', key);
local jvalue = cjson.encode(cmsgpack.unpack(value));
return jvalue;

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--EVAL "this script" 1 key userid password
local key = KEYS[1];
local userid, pass = unpack(ARGV);

local hash = redis.sha1hex('SOME-STATIC-SALT'..string.sub(pass, 1, 2)..userid..string.sub(pass, 3));

--no error, does hash match?
return {false, (redis.call('GET', key) == hash)}

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--EVAL "this script" 1 some-hash-key
local key = KEYS[1];
local keyvalues = redis.call('HGETALL', key);
local result = {};

--every other value is a key
for idx = 1, #keyvalues, 2 do
    result[keyvalues[idx]] = keyvalues[idx + 1]
end

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--2 key changelog update millisecond-epoch
local key, changelog = unpack(KEYS);
local update, epoch = unpack(ARGV);

local result = redis.call('SET', key, update);

local notice = cjson.encode({key = key, value = update, time = epoch});

redis.call('ZADD', changelog, epoch, notice);
redis.call('ZREMRANGEBYSCORE', changelog, '-inf', epoch - 86400000);

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#!/usr/bin/env node
// ./generatelookup -l lookupkey -p somekey* -a attribute
var redis = require('redis').createClient();
var async = require('async');
var opt = require('optimist');
opt.usage('$0 -l lookup -p pattern -a attribute');
opt.demand(['l', 'p', 'a']);
var argv = opt.argv;

var iter = '0';

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--EVAL "this script" 2 key lookup jsonvalue attribute

local key, lookup = unpack(KEYS);
local jsonvalue, attribute = unpack(ARGV);
local value = cjson.decode(jsonvalue);

local oldvalue = redis.call('GET', key);
--if this key was set before, remove the old lookup
if type(oldvalue) == 'string' then
    oldvalue = cjson.decode(oldvalue);

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//whenever uncached images are added to the dom tree within target,
//replace them with a spinner gif until they're loaded
function replaceImages(target, spinner_src) {
    var spinner, observer;

    //detect support
    if (window.MutationObserver) {
        //preload spinner (probably a gif)
        //if it's not ready for first use, oh well
        spinner = new Image();