Files: 798d7ea858881504d038705f550581dd75eabaa3 / util.js
1113 bytesRaw
| 1 | var pull = require('pull-stream') |
| 2 | var Next = require('pull-next') |
| 3 | |
| 4 | function first (list, test) { |
| 5 | for(var i in list) { |
| 6 | var value = test(list[i], i, list) |
| 7 | if(value) return value |
| 8 | } |
| 9 | } |
| 10 | |
| 11 | function decorate (list, value, caller) { |
| 12 | caller = caller || function (d,e,v) { return d(e, v) } |
| 13 | |
| 14 | return list.reduce(function (element, decorator) { |
| 15 | return caller(decorator, element, value) || element |
| 16 | }, null) |
| 17 | } |
| 18 | |
| 19 | exports.first = first |
| 20 | exports.decorate = decorate |
| 21 | |
| 22 | exports.next = function (createStream, opts, range, property) { |
| 23 | |
| 24 | range = range || opts.reverse ? 'lt' : 'gt' |
| 25 | property = property || 'timestamp' |
| 26 | |
| 27 | var last = null |
| 28 | return Next(function () { |
| 29 | if(last) { |
| 30 | opts[range] = last[property] |
| 31 | } |
| 32 | return pull( |
| 33 | createStream(opts), |
| 34 | pull.through(function (msg) { |
| 35 | if(!msg.sync) last = msg |
| 36 | }) |
| 37 | ) |
| 38 | }) |
| 39 | } |
| 40 | |
| 41 | exports.firstPlug = function (plugs) { |
| 42 | if(!Array.isArray(plugs)) throw new Error('plugs must be an array') |
| 43 | var args = [].slice.call(arguments) |
| 44 | var plugs = args.shift() |
| 45 | return exports.first(plugs, function (fn) { |
| 46 | return fn.apply(null, args) |
| 47 | }) |
| 48 | } |
| 49 | |
| 50 |
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