Files: a25ce72e2aaed3ec44c050011d9394502c4cc797 / feed / pull / unique.js
756 bytesRaw
| 1 | var pull = require('pull-stream') |
| 2 | var nest = require('depnest') |
| 3 | |
| 4 | exports.needs = nest({ |
| 5 | 'backlinks.obs.for': 'first', |
| 6 | 'sbot.async.get': 'first', |
| 7 | 'message.sync.isBlocked': 'first', |
| 8 | 'message.sync.root': 'first', |
| 9 | 'message.sync.unbox': 'first', |
| 10 | 'feed.pull.withReplies': 'first' |
| 11 | }) |
| 12 | |
| 13 | exports.gives = nest('feed.pull.unique', true) |
| 14 | |
| 15 | exports.create = function (api) { |
| 16 | return nest('feed.pull.unique', function (rootFilter) { |
| 17 | var seen = new Set() |
| 18 | return pull.filter(idOrMsg => { |
| 19 | if (idOrMsg) { |
| 20 | if (idOrMsg.key) idOrMsg = idOrMsg.key |
| 21 | if (typeof idOrMsg === 'string') { |
| 22 | var key = idOrMsg |
| 23 | if (!seen.has(key)) { |
| 24 | seen.add(key) |
| 25 | return true |
| 26 | } |
| 27 | } |
| 28 | } |
| 29 | }) |
| 30 | }) |
| 31 | } |
| 32 |
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