| 1 | import type { FeedItem } from "@/lib/types"; |
| 2 | import { relativeAge, relativeTime } from "@/lib/github"; |
| 3 | import { splitToken } from "@/lib/i18n/dictionaries"; |
| 4 | import { truncateChars } from "@/lib/truncate"; |
| 5 | |
| 6 | /** |
| 7 | * The wire strip under the masthead: what actually happened in the |
| 8 | * repository, in the reader's language, with the person who did it named. |
| 9 | * |
| 10 | * Everything here is GitHub's own record — merge state, handles, and |
| 11 | * GitHub's `author_association` first-timer verdict, all from the list |
| 12 | * payloads `fetchFeed` already pulls. Nothing is summarized, ranked, or |
| 13 | * generated; an empty feed renders nothing at all rather than a skeleton. |
| 14 | * |
| 15 | * Titles and handles are content and stay verbatim. The chrome around them — |
| 16 | * the event verb, the by-line, the first-contribution mark — comes from the |
| 17 | * caller's dictionary, and the age comes from CLDR via the locale's own |
| 18 | * `dateLocale`. |
| 19 | */ |
| 20 | export interface TickerLabels { |
| 21 | /** Han-seal live label and its mono tag. */ |
| 22 | liveLabel: string; |
| 23 | liveTag: string; |
| 24 | /** aria-label for the strip's landmark. */ |
| 25 | ariaLabel: string; |
| 26 | /** Event verbs. Drafts never reach the strip — see `EVENT_STATES`. */ |
| 27 | merged: string; |
| 28 | opened: string; |
| 29 | closed: string; |
| 30 | released: string; |
| 31 | /** Mark on a newcomer's contribution, e.g. "first contribution". */ |
| 32 | firstContribution: string; |
| 33 | /** By-line template carrying a `{handle}` token, e.g. "by {handle}". */ |
| 34 | by: string; |
| 35 | /** BCP 47 tag driving `Intl.RelativeTimeFormat` (chrome.dateLocale). */ |
| 36 | dateLocale: string; |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * States the strip reports. A draft pull request is the one thing here that |
| 41 | * is not an event — it is work its own author has marked not-ready — and on a |
| 42 | * repository where agents open them in batches it crowds out the merges and |
| 43 | * the people behind them. It reappears the moment it is opened or merged. |
| 44 | */ |
| 45 | const EVENT_STATES: readonly FeedItem["state"][] = ["merged", "open", "closed", "published"]; |
| 46 | |
| 47 | /** The state a feed item is in → the verb the strip prints for it. */ |
| 48 | function verbFor(state: FeedItem["state"], labels: TickerLabels): string { |
| 49 | switch (state) { |
| 50 | case "merged": |
| 51 | return labels.merged; |
| 52 | case "closed": |
| 53 | return labels.closed; |
| 54 | case "published": |
| 55 | return labels.released; |
| 56 | default: |
| 57 | return labels.opened; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Locale age formatter. `Intl.RelativeTimeFormat` is unavailable or missing |
| 63 | * locale data on some runtimes; falling back to the compact English form is |
| 64 | * an honest degradation, an empty timestamp is not. |
| 65 | */ |
| 66 | function ageFormatter(dateLocale: string): (iso: string) => string { |
| 67 | let rtf: Intl.RelativeTimeFormat | undefined; |
| 68 | try { |
| 69 | rtf = new Intl.RelativeTimeFormat(dateLocale, { numeric: "auto", style: "narrow" }); |
| 70 | } catch { |
| 71 | rtf = undefined; |
| 72 | } |
| 73 | return (iso: string) => { |
| 74 | if (!rtf) return relativeTime(iso); |
| 75 | const { value, unit } = relativeAge(iso); |
| 76 | return rtf.format(value, unit); |
| 77 | }; |
| 78 | } |
| 79 | |
| 80 | function TickerEntry({ |
| 81 | item, |
| 82 | labels, |
| 83 | age, |
| 84 | hidden, |
| 85 | }: { |
| 86 | item: FeedItem; |
| 87 | labels: TickerLabels; |
| 88 | age: string; |
| 89 | hidden: boolean; |
| 90 | }) { |
| 91 | const isRelease = item.kind === "release"; |
| 92 | // A release named after its own tag would print the tag twice. |
| 93 | const title = isRelease && item.title === item.tag ? "" : item.title; |
| 94 | const [beforeHandle, afterHandle] = splitToken(labels.by, "handle"); |
| 95 | |
| 96 | return ( |
| 97 | <span className="ticker-item" aria-hidden={hidden || undefined}> |
| 98 | <span className="ticker-verb" data-event={item.state}> |
| 99 | {verbFor(item.state, labels)} |
| 100 | </span> |
| 101 | {isRelease ? ( |
| 102 | <span className="ticker-tag tabular">{item.tag}</span> |
| 103 | ) : ( |
| 104 | <span className="ticker-num tabular">#{item.number}</span> |
| 105 | )} |
| 106 | {title ? ( |
| 107 | <span className="ticker-title">{truncateChars(title, 70)}</span> |
| 108 | ) : null} |
| 109 | {item.author ? ( |
| 110 | <span className="ticker-by"> |
| 111 | {beforeHandle} |
| 112 | <span className="ticker-handle">@{item.author}</span> |
| 113 | {afterHandle} |
| 114 | </span> |
| 115 | ) : null} |
| 116 | {item.firstTimeContributor ? ( |
| 117 | <span className="ticker-first">{labels.firstContribution}</span> |
| 118 | ) : null} |
| 119 | <span className="ticker-age tabular">{age}</span> |
| 120 | <span className="ticker-sep" aria-hidden> |
| 121 | ◆ |
| 122 | </span> |
| 123 | </span> |
| 124 | ); |
| 125 | } |
| 126 | |
| 127 | export function Ticker({ items, labels }: { items: FeedItem[]; labels: TickerLabels }) { |
| 128 | // Newest event first — the verb and the age describe the same moment, so |
| 129 | // the strip reads as a wire and never dates a merge by a later comment. |
| 130 | const ordered = items |
| 131 | .filter((item) => EVENT_STATES.includes(item.state)) |
| 132 | .sort((a, b) => +new Date(b.eventAt ?? b.updatedAt) - +new Date(a.eventAt ?? a.updatedAt)); |
| 133 | |
| 134 | // Nothing to report is reported as nothing. |
| 135 | if (!ordered.length) return null; |
| 136 | |
| 137 | const formatAge = ageFormatter(labels.dateLocale); |
| 138 | // Seamless loop: the track translates -50%, so both halves must be the same |
| 139 | // flat run of children. The second half is hidden from assistive tech. |
| 140 | const doubled = [...ordered, ...ordered]; |
| 141 | |
| 142 | // Loop duration: never faster than the original 80s baseline; longer feeds |
| 143 | // (CJK titles run 2-4x wider than English) get proportionally more time so |
| 144 | // every locale scrolls at a readable pace. |
| 145 | const glyphCount = ordered.reduce( |
| 146 | (sum, item) => sum + (item.title?.length ?? 0) + 24, |
| 147 | 0, |
| 148 | ); |
| 149 | const durationSeconds = Math.max(80, Math.round(glyphCount / 22)); |
| 150 | |
| 151 | return ( |
| 152 | <div className="hairline-t hairline-b bg-paper-deep overflow-hidden"> |
| 153 | <div className="site-container flex items-stretch"> |
| 154 | <div className="border-r border-paper-edge text-ink px-4 py-2 flex items-center shrink-0 gap-2"> |
| 155 | <span className="w-1.5 h-1.5 bg-indigo rounded-full inline-block animate-pulse" /> |
| 156 | <span className="font-cjk text-sm font-semibold tracking-wider">{labels.liveLabel}</span> |
| 157 | <span className="font-mono text-[0.55rem] uppercase tracking-widest text-ink-mute ml-1 self-end mb-0.5"> |
| 158 | {labels.liveTag} |
| 159 | </span> |
| 160 | </div> |
| 161 | <div className="ticker-viewport" role="group" aria-label={labels.ariaLabel}> |
| 162 | <div |
| 163 | className="ticker-track py-2 font-mono text-[0.78rem]" |
| 164 | style={{ animationDuration: `${durationSeconds}s` }} |
| 165 | > |
| 166 | {doubled.map((item, i) => ( |
| 167 | <TickerEntry |
| 168 | key={`${item.url}-${i}`} |
| 169 | item={item} |
| 170 | labels={labels} |
| 171 | age={formatAge(item.eventAt ?? item.updatedAt)} |
| 172 | hidden={i >= ordered.length} |
| 173 | /> |
| 174 | ))} |
| 175 | </div> |
| 176 | </div> |
| 177 | </div> |
| 178 | </div> |
| 179 | ); |
| 180 | } |
| 181 |