2024-10-23 21:20:24 +00:00
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<script lang="ts">
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2026-08-29 16:19:01 +00:00
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import {onDestroy} from "svelte"
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2026-06-17 16:08:58 +00:00
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import * as nip19 from "nostr-tools/nip19"
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2024-10-23 21:20:24 +00:00
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import {page} from "$app/stores"
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2026-08-22 18:20:33 +00:00
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import {call, sleep, spec, tryCatch} from "@welshman/lib"
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2025-10-13 20:35:02 +00:00
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import type {MakeNonOptional} from "@welshman/lib"
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2026-06-17 16:08:58 +00:00
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import type {TrustedEvent} from "@welshman/util"
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2026-07-28 16:16:26 +00:00
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import {deriveEventsAsc} from "@welshman/store"
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2026-08-17 15:42:14 +00:00
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import {getCommentFiltersForRoot, tagValue, tagSpec} from "@welshman/util"
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2025-09-10 22:26:39 +00:00
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import Reply from "@assets/icons/reply-2.svg?dataurl"
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2024-10-23 21:20:24 +00:00
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import Icon from "@lib/components/Icon.svelte"
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2025-03-19 17:30:36 +00:00
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import PageContent from "@lib/components/PageContent.svelte"
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2024-10-24 18:52:02 +00:00
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import Spinner from "@lib/components/Spinner.svelte"
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2024-10-23 21:20:24 +00:00
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import Button from "@lib/components/Button.svelte"
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2026-06-17 16:08:58 +00:00
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import Link from "@lib/components/Link.svelte"
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2026-03-12 23:41:07 +00:00
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import SpaceBar from "@app/components/SpaceBar.svelte"
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2026-06-17 16:08:58 +00:00
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import ThreadPost from "@app/components/ThreadPost.svelte"
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2025-02-06 18:24:31 +00:00
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import EventReply from "@app/components/EventReply.svelte"
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2026-06-17 16:08:58 +00:00
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import RoomName from "@app/components/RoomName.svelte"
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2026-07-28 16:16:26 +00:00
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import {deriveEvent, deriveEventsById} from "@app/repository"
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2026-08-13 21:44:41 +00:00
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import {network} from "@app/core"
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2026-08-29 16:19:01 +00:00
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import {makeFeedContext} from "@app/feeds"
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2026-06-08 22:33:38 +00:00
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import {decodeRelay} from "@app/relays"
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2026-06-17 16:08:58 +00:00
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import {makeSpacePath, scrollToEvent} from "@app/routes"
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2026-09-10 03:37:37 +00:00
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const REPLY_BATCH_SIZE = 20
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2024-10-23 21:20:24 +00:00
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2025-10-13 20:35:02 +00:00
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const {relay, id} = $page.params as MakeNonOptional<typeof $page.params>
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2024-10-23 21:20:24 +00:00
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const url = decodeRelay(relay)
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2025-11-20 23:54:06 +00:00
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const event = deriveEvent(id, [url])
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2026-08-29 16:19:01 +00:00
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// Rows register themselves with `related`, so the whole page's reactions load in one batch
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const context = makeFeedContext({relays: [url]})
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2026-08-17 15:42:14 +00:00
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const filters = $derived($event ? getCommentFiltersForRoot([$event]) : [])
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const replies = $derived(deriveEventsAsc(deriveEventsById(filters)))
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2024-10-23 21:20:24 +00:00
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const back = () => history.back()
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2026-09-10 03:37:37 +00:00
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const replyCount = $derived($replies.length)
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2026-07-28 16:16:26 +00:00
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const h = $derived(tagValue(tagSpec("h"), $event?.tags || []))
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2026-06-17 16:08:58 +00:00
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2026-09-10 03:37:37 +00:00
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// A permalink's target. Replies stream in newest first, so the post it names is usually here
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// long before the ones above it — its position is only right once the thread has finished
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// arriving, so this is kept and re-read rather than acted on the first time it shows up.
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let target: string | undefined = $state(
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call(() => {
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const hash = window.location.hash.replace(/^#/, "")
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2026-06-17 16:08:58 +00:00
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2026-09-10 03:37:37 +00:00
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if (hash.startsWith("nevent1")) {
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const decoded = tryCatch(() => nip19.decode(hash))
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2026-06-17 16:08:58 +00:00
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2026-09-10 03:37:37 +00:00
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if (decoded?.type === "nevent") {
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return decoded.data.id
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}
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}
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}),
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)
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2026-06-17 16:08:58 +00:00
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2026-09-10 03:37:37 +00:00
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let revealed = $state(REPLY_BATCH_SIZE)
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2026-06-17 16:08:58 +00:00
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2026-09-10 03:37:37 +00:00
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const targetIndex = $derived(target ? $replies.findIndex(spec({id: target})) : -1)
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// A thread reads from its newest end, and the reader pulls earlier replies in from there. A
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// permalink reaches back as far as it has to on its own.
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const visibleCount = $derived(
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targetIndex < 0 ? revealed : Math.max(revealed, $replies.length - targetIndex),
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2026-06-17 16:08:58 +00:00
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)
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2026-09-10 03:37:37 +00:00
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const visibleReplies = $derived($replies.slice(Math.max(0, $replies.length - visibleCount)))
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2026-06-17 16:08:58 +00:00
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2026-09-10 03:37:37 +00:00
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const hiddenCount = $derived($replies.length - visibleReplies.length)
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2026-06-17 16:08:58 +00:00
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2026-09-10 03:37:37 +00:00
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// Reaching back by hand hands control back to the reader.
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const showEarlier = () => {
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const nextCount = visibleCount + REPLY_BATCH_SIZE
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2026-06-17 16:08:58 +00:00
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2026-09-10 03:37:37 +00:00
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target = undefined
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revealed = nextCount
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2026-06-17 16:08:58 +00:00
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}
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const openReply = (post: TrustedEvent) => {
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replyTo = post
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2024-10-23 23:16:28 +00:00
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showReply = true
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}
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2024-10-23 21:20:24 +00:00
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2024-10-23 23:16:28 +00:00
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const closeReply = () => {
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showReply = false
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replyTo = undefined
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}
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2026-06-17 16:08:58 +00:00
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const openThreadReply = () => {
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if ($event) {
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openReply($event)
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}
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}
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const clearReplyParent = () => {
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if ($event) {
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replyTo = $event
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}
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2024-11-21 19:52:29 +00:00
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}
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2026-08-29 16:19:01 +00:00
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onDestroy(context.cleanup)
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2025-02-04 00:37:14 +00:00
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let showReply = $state(false)
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2026-06-17 16:08:58 +00:00
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let replyTo: TrustedEvent | undefined = $state()
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2026-08-22 18:20:33 +00:00
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$effect(() => {
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2026-09-10 03:37:37 +00:00
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if (target && (target === $event?.id || targetIndex >= 0)) {
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setTimeout(() => scrollToEvent(target!), 100)
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2026-06-17 16:08:58 +00:00
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}
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})
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2024-10-24 18:52:02 +00:00
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2026-08-17 15:42:14 +00:00
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$effect(() => {
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if (filters.length > 0) {
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const controller = new AbortController()
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2025-04-11 16:27:19 +00:00
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2026-08-17 15:42:14 +00:00
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$network.request({relays: [url], filters, signal: controller.signal})
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2024-11-14 18:53:13 +00:00
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2026-08-17 15:42:14 +00:00
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return () => controller.abort()
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2024-11-15 22:03:54 +00:00
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}
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2024-11-14 18:53:13 +00:00
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})
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2024-10-23 21:20:24 +00:00
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</script>
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2026-06-17 16:08:58 +00:00
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<SpaceBar {back} class="!h-auto min-h-20 py-3">
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2025-03-19 17:30:36 +00:00
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{#snippet title()}
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2026-06-17 16:08:58 +00:00
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<div class="flex min-w-0 flex-col gap-0.5">
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2026-07-02 21:22:55 +00:00
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<h1 class="truncate min-w-0 font-bold sm:text-xl">
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2026-07-28 16:16:26 +00:00
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{tagValue(tagSpec("title"), $event?.tags || []) || ""}
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</h1>
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<p class="text-xs opacity-75">
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{replyCount}
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{replyCount === 1 ? "reply" : "replies"}
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{#if h}
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· <Link href={makeSpacePath(url, h)} class="link">#<RoomName {url} {h} /></Link>
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{/if}
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</p>
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</div>
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2025-03-19 17:30:36 +00:00
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{/snippet}
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2026-03-12 23:41:07 +00:00
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</SpaceBar>
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2025-03-19 17:30:36 +00:00
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2026-06-24 20:56:53 +00:00
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<PageContent noPad class="flex flex-col">
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2024-10-24 18:52:02 +00:00
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{#if $event}
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<div class="bg-surface border-y" style="border-color: var(--line)">
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2026-09-10 03:37:37 +00:00
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<ThreadPost {url} {context} event={$event} threadPubkey={$event.pubkey} onReply={openReply} />
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2025-03-19 17:30:36 +00:00
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</div>
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2026-09-10 03:37:37 +00:00
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{#if hiddenCount > 0}
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<div class="flex justify-center py-4">
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<Button class="button button-neutral button-sm" onclick={showEarlier}>
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Show earlier replies
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</Button>
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</div>
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{/if}
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{#if visibleReplies.length > 0}
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<div class="bg-surface border-y" style="border-color: var(--line)">
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{#each visibleReplies as reply (reply.id)}
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<ThreadPost
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{url}
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{context}
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event={reply}
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threadPubkey={$event.pubkey}
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onReply={openReply} />
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{/each}
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</div>
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{/if}
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{#if showReply && replyTo && $event}
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<EventReply
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{url}
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event={$event}
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parent={replyTo.id === $event.id ? undefined : replyTo}
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onClose={closeReply}
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onClearParent={clearReplyParent}
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onSubmit={closeReply} />
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2025-03-19 17:30:36 +00:00
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{:else}
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2026-06-17 16:08:58 +00:00
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<div class="flex justify-end p-4">
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2026-06-24 20:56:53 +00:00
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<Button class="button button-primary" onclick={openThreadReply}>
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2025-09-10 22:26:39 +00:00
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<Icon icon={Reply} />
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2025-03-19 17:30:36 +00:00
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Reply to thread
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2024-11-21 19:52:29 +00:00
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</Button>
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</div>
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{/if}
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2024-10-24 18:52:02 +00:00
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{:else}
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2026-06-04 21:31:07 +00:00
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<div class="flex justify-center py-20">
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{#await sleep(5000)}
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<Spinner loading>Loading thread...</Spinner>
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{:then}
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<p>Failed to load thread.</p>
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{/await}
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</div>
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2024-10-24 18:52:02 +00:00
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{/if}
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2025-03-19 17:30:36 +00:00
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</PageContent>
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