git ssb

1
const nest = require('depnest')
2
const { h, Value, Array: MutantArray, Struct, computed, when, map } = require('mutant')
3
const pull = require('pull-stream')
4
const Scroller = require('mutant-scroll')
5
const next = require('pull-next-query')
6
const merge = require('lodash/merge')
7
const get = require('lodash/get')
8
const sort = require('ssb-sort')
9
10
exports.gives = nest({
11
  'app.html.menuItem': true,
12
  'app.page.posts': true
13
})
14
15
exports.needs = nest({
16
  'about.obs.name': 'first',
17
  'about.html.avatar': 'first',
18
  'about.html.link': 'first',
19
  'app.sync.goTo': 'first',
20
  'app.sync.locationId': 'first',
21
  'keys.sync.id': 'first',
22
  'message.html.compose': 'first',
23
  'message.html.markdown': 'first',
24
  'message.html.timestamp': 'first',
25
  'message.obs.backlinks': 'first',
26
  'sbot.async.get': 'first',
27
  'sbot.pull.stream': 'first'
28
})
29
30
exports.create = function (api) {
31
  return nest({
32
    'app.html.menuItem': menuItem,
33
    'app.page.posts': postsPage
34
  })
35
36
  function menuItem () {
37
    return h('a', {
38
      'ev-click': () => api.app.sync.goTo({ page: 'posts' })
39
    }, '/posts')
40
  }
41
42
  function postsPage (location) {
43
    const BY_UPDATE = 'Update'
44
    const BY_START = 'Start'
45
46
    const state = Struct({
47
      sort: Value(BY_UPDATE),
48
      show: Struct({
49
        feedId: Value(api.keys.sync.id()),
50
        started: Value(true),
51
        participated: Value(true),
52
        other: Value(true)
53
      })
54
    })
55
    // const feedRoots = getFeedRoots(state.show.feedId)
56
57
    const viewSettings = h('section.viewSettings', [
58
      h('div.show', [
59
        h('span', 'Show threads:'),
60
        h('div.toggle',
61
          { className: when(state.show.started, '-active'), 'ev-click': () => state.show.started.set(!state.show.started()) },
62
          [ h('i.fa.fa-eye'), 'started' ]
63
        ),
64
        h('div.toggle',
65
          { className: when(state.show.participated, '-active'), 'ev-click': () => state.show.participated.set(!state.show.participated()) },
66
          [ h('i.fa.fa-eye'), 'participated' ]
67
        ),
68
        h('div.toggle',
69
          { className: when(state.show.other, '-active'), 'ev-click': () => state.show.other.set(!state.show.other()) },
70
          [ h('i.fa.fa-eye', {}), 'other' ]
71
        )
72
      ]),
73
      h('div.sort', [
74
        h('span', 'Sort by:'),
75
        h('button', {
76
          className: computed(state.sort, s => s === BY_UPDATE ? '-primary' : ''),
77
          'ev-click': () => state.sort.set(BY_UPDATE)
78
        }, BY_UPDATE),
79
        h('button', {
80
          className: computed(state.sort, s => s === BY_START ? '-primary' : ''),
81
          'ev-click': () => state.sort.set(BY_START)
82
        }, BY_START)
83
      ])
84
    ])
85
86
    return computed(state, state => {
87
      var page
88
      if (state.sort === BY_UPDATE) page = PageByUpdate(state)
89
      if (state.sort === BY_START) page = PageByStart(state)
90
91
      page.title = '/posts'
92
      page.id = api.app.sync.locationId({ page: 'posts' }) // this is needed because our page is a computed
93
      page.keyboardScroll = keyscroll(page.querySelector('section.content'))
94
      return page
95
    })
96
97
    function PageByUpdate (state) {
98
      const createStream = (opts) => {
99
        const { started, participated, other } = state.show
100
        if (!started && !participated && !other) return pull.empty()
101
102
        return api.sbot.pull.stream(server => {
103
          const $filter = {
104
            timestamp: { $gt: 0 },
105
            value: {
106
              content: {
107
                type: 'post',
108
                recps: { $not: true }
109
              }
110
            }
111
          }
112
          const defaults = { limit: 100, query: [{ $filter }] }
113
          return next(server.query.read, merge({}, defaults, opts), ['timestamp'])
114
        })
115
      }
116
117
      return Scroller({
118
        classList: ['Posts'],
119
        prepend: [
120
          viewSettings,
121
          Composer(location)
122
        ],
123
        streamToTop: createStream({ live: true, old: false }),
124
        streamToBottom: createStream({ reverse: true }),
125
        updateTop: (soFar, msg) => {
126
          const root = getRoot(msg)
127
          if (soFar.includes(root)) soFar.delete(root)
128
          soFar.insert(root)
129
        },
130
        updateBottom: (soFar, msg) => {
131
          const root = getRoot(msg)
132
          if (!soFar.includes(root)) soFar.push(root)
133
        },
134
        render: key => render(state, key)
135
      })
136
    }
137
138
    function PageByStart (state) {
139
      const createStream = (opts) => {
140
        const { feedId, started, participated, other } = state.show
141
        if (!started && !participated && !other) return pull.empty()
142
143
        return api.sbot.pull.stream(server => {
144
          const defaults = {
145
            limit: 200,
146
            query: [{
147
              $filter: {
148
                value: {
149
                  timestamp: { $gt: 0 },
150
                  content: {
151
                    type: 'post',
152
                    root: { $not: true }, // is a root (as doesn't name a root)
153
                    recps: { $not: true } // is public
154
                  }
155
                }
156
              }
157
            }, {
158
              $map: {
159
                key: 'key', // this means this stream behvaues same as PageByUpdate (only keys in store)
160
                value: {
161
                  timestamp: ['value', 'timestamp']
162
                }
163
              }
164
            }]
165
          }
166
          if (started && !participated && !other) {
167
            defaults.query[0].$filter.value.author = feedId
168
          }
169
170
          // server.query.explain(merge({}, defaults, opts), console.log)
171
          return pull(
172
            next(server.query.read, merge({}, defaults, opts), ['value', 'timestamp']),
173
            pull.map(m => m.key)
174
          )
175
        })
176
      }
177
178
      return Scroller({
179
        classList: ['Posts'],
180
        prepend: [
181
          viewSettings,
182
          Composer(location)
183
        ],
184
        streamToTop: createStream({ live: true, old: false }),
185
        streamToBottom: createStream({ reverse: true }),
186
        render: key => render(state, key)
187
      })
188
    }
189
  }
190
191
  function Composer (location) {
192
    return api.message.html.compose({
193
      location,
194
      meta: { type: 'post' },
195
      placeholder: 'Write a public message'
196
    })
197
  }
198
199
  // TODO - extract somewhere?
200
  function render (state, key) {
201
    const root = buildRoot(key)
202
    const { recent, repliesCount, likesCount, backlinksCount, participants } = buildThread(key)
203
204
    const { feedId, started, participated, other } = state.show
205
    // throttling?
206
    const isVisible = computed([root.author, participants], (a, p) => {
207
      return Boolean(
208
        (started ? (a === feedId) : null) ||
209
        (participated ? (p.includes(feedId)) : null) ||
210
        (other ? (!p.includes(feedId)) : null)
211
      )
212
    })
213
    // NOTE - this filtering could be done more efficiently upstream with some targeted
214
    // or merged queries. The 'other' case is probably hard to do tidily
215
216
    const onClick = ev => {
217
      ev.preventDefault()
218
      ev.stopPropagation()
219
      api.app.sync.goTo(key)
220
    }
221
222
    return when(root.sync,
223
      when(isVisible,
224
        h('ThreadCard',
225
          {
226
            // className: computed(root.md, r => r ? '' : '-loading'),
227
            attributes: {
228
              tabindex: '0', // needed to be able to navigate and show focus()
229
              'data-key': key // TODO do this with decorators?
230
            }
231
          }, [
232
            h('section.authored', [
233
              h('div.avatar', root.avatar),
234
              h('div.name', root.authorName),
235
              h('div.timestamp', root.timestamp)
236
            ]),
237
            h('section.content-preview', { 'ev-click': onClick }, [
238
              h('div.root', root.md),
239
              h('div.recent', map(recent, msg => {
240
                return h('div.msg', [
241
                  h('span.author', api.about.obs.name(msg.value.author)),
242
                  ': ',
243
                  h('span.preview', [
244
                    api.message.html.markdown(msg.value.content).innerText.slice(0, 120),
245
                    '...'
246
                  ])
247
                ])
248
              }))
249
            ]),
250
            h('section.stats', [
251
              h('div.participants', map(participants, api.about.html.avatar)),
252
              h('div.counts', [
253
                h('div.comments', [ repliesCount, h('i.fa.fa-comment-o') ]),
254
                h('div.likes', [ likesCount, h('i.fa.fa-heart-o') ]),
255
                h('div.backlinks', [ backlinksCount, h('i.fa.fa-link') ])
256
              ])
257
            ])
258
          ]
259
        )
260
        // h('div', 'non-match')
261
      )
262
      // h('ThreadCard -loading')
263
    )
264
  }
265
266
  function buildRoot (key) {
267
    const root = Struct({
268
      author: '',
269
      authorName: '',
270
      avatar: '',
271
      timestamp: '',
272
      md: ''
273
    })
274
    root.sync = Value(false)
275
276
    api.sbot.async.get(key, (err, value) => {
277
      if (err) return console.error('ThreadCard could not fetch ', key)
278
      root.author.set(value.author)
279
      root.authorName.set(api.about.html.link(value.author))
280
      root.avatar.set(api.about.html.avatar(value.author))
281
      root.timestamp.set(api.message.html.timestamp({ key, value }))
282
      root.md.set(api.message.html.markdown(value.content))
283
284
      root.sync.set(true)
285
    })
286
287
    return root
288
  }
289
290
  function buildThread (key) {
291
    const recent = MutantArray([])
292
    const repliesCount = Value()
293
    const likesCount = Value()
294
    const backlinksCount = Value()
295
    const participants = MutantArray([])
296
297
    const opts = {
298
      query: [{
299
        $filter: { dest: key }
300
      }],
301
      index: 'DTA' // asserted timestamp
302
    }
303
    pull(
304
      api.sbot.pull.stream(server => server.backlinks.read(opts)),
305
      pull.collect((err, msgs) => {
306
        if (err) console.error(err)
307
308
        msgs = sort(msgs)
309
310
        const replies = msgs
311
          .filter(isPost)
312
          .filter(m => getRoot(m) === key)
313
314
        repliesCount.set(replies.length)
315
        recent.set(lastFew(replies))
316
317
        const likes = msgs.filter(isLikeOf(key))
318
        likesCount.set(likes.length)
319
320
        const backlinks = msgs
321
          .filter(isPost)
322
          .filter(m => getRoot(m) !== key)
323
        backlinksCount.set(backlinks.length)
324
325
        const authors = replies
326
          .map(m => m.value.author)
327
        participants.set(Array.from(new Set(authors)))
328
      })
329
    )
330
331
    return { recent, repliesCount, likesCount, backlinksCount, participants }
332
  }
333
334
  // function getFeedRoots (feedId) {
335
  //   const obs = computed(feedId, feedId => {
336
  //     const keys = MutantArray([])
337
  //     const source = opts => api.sbot.pull.stream(s => s.query.read(opts))
338
  //     const opts = {
339
  //       query: [{
340
  //         $filter: {
341
  //           value: {
342
  //             author: feedId,
343
  //             content: {
344
  //               root: { $not: true },
345
  //               recps: { $not: true }
346
  //             }
347
  //           }
348
  //         }
349
  //       }, {
350
  //         $map: 'key'
351
  //       }],
352
  //       live: true
353
  //     }
354
355
  //     pull(
356
  //         source(opts),
357
  //         pull.drain(k => {
358
  //           if (k.sync) obs.sync.set(true)
359
  //           else keys.push(k)
360
  //         })
361
  //       )
362
363
  //     return keys
364
  //   })
365
366
  //   obs.sync = Value(false)
367
  //   return obs
368
  // }
369
}
370
371
function getRoot (msg) {
372
  return get(msg, 'value.content.root', msg.key)
373
}
374
375
function isPost (msg) {
376
  return get(msg, 'value.content.type') === 'post'
377
}
378
379
function isLikeOf (key) {
380
  return function (msg) {
381
    return get(msg, 'value.content.type') === 'vote' &&
382
      get(msg, 'value.content.vote.link') === key
383
  }
384
}
385
386
function lastFew (arr) {
387
  return arr.reverse().slice(0, 3).reverse()
388
}
389
390
// copied from app.html.scroller
391
function keyscroll (content) {
392
  var curMsgEl
393
394
  if (!content) return () => {}
395
396
  content.addEventListener('click', onActivateChild, false)
397
  content.addEventListener('focus', onActivateChild, true)
398
399
  function onActivateChild (ev) {
400
    for (var el = ev.target; el; el = el.parentNode) {
401
      if (el.parentNode === content) {
402
        curMsgEl = el
403
        return
404
      }
405
    }
406
  }
407
408
  return function scroll (d) {
409
    selectChild((!curMsgEl || d === 'first') ? content.firstChild
410
      : d < 0 ? curMsgEl.previousElementSibling || content.firstChild
411
        : d > 0 ? curMsgEl.nextElementSibling || content.lastChild
412
          : curMsgEl)
413
414
    return curMsgEl
415
  }
416
417
  function selectChild (el) {
418
    if (!el) { return }
419
420
    content.parentElement.scrollTop = el.offsetTop - content.parentElement.offsetTop - 10
421
    // if (!el.scrollIntoViewIfNeeded && !el.scrollIntoView) return
422
    // ;(el.scrollIntoViewIfNeeded || el.scrollIntoView).call(el)
423
    if (el.focus) el.focus()
424
    curMsgEl = el
425
  }
426
}
427