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import type { NDKEvent } from "@nostr-dev-kit/ndk";
import { nip19 } from "nostr-tools";
export function neventEncode(event: NDKEvent, relays: string[]) {
return nip19.neventEncode({
id: event.id,
kind: event.kind,
relays,
author: event.pubkey,
});
}
export function formatDate(unixtimestamp: number) {
const months = [
"Jan",
"Feb",
"Mar",
"Apr",
"May",
"Jun",
"Jul",
"Aug",
"Sep",
"Oct",
"Nov",
"Dec",
];
const date = new Date(unixtimestamp * 1000);
const day = date.getDate();
const month = months[date.getMonth()];
const year = date.getFullYear();
const formattedDate = `${day} ${month} ${year}`;
return formattedDate;
}
let serial = 0;
export function next(): number {
serial++;
return serial;
}
export function scrollTabIntoView(el: string | HTMLElement, wait: boolean) {
function scrollTab() {
const element =
typeof el === "string"
? document.querySelector(`[id^="wikitab-v0-${el}"]`)
: el;
if (!element) return;
element.scrollIntoView({
behavior: "smooth",
inline: "start",
});
}
if (wait) {
setTimeout(() => {
scrollTab();
}, 1);
} else {
scrollTab();
}
}
export function isElementInViewport(el: string | HTMLElement) {
const element =
typeof el === "string"
? document.querySelector(`[id^="wikitab-v0-${el}"]`)
: el;
if (!element) return;
const rect = element.getBoundingClientRect();
return (
rect.top >= 0 &&
rect.left >= 0 &&
rect.bottom <=
(window.innerHeight || document.documentElement.clientHeight) &&
rect.right <= (window.innerWidth || document.documentElement.clientWidth)
);
}
/**
* Removes `kind: 30040` index events that don't comply with the NKBIP-01 specification.
* @param events A set of events.
* @returns The filtered set of events.
*/
export function filterValidIndexEvents(events: Set<NDKEvent>): Set<NDKEvent> {
// The filter object supports only limited parameters, so we need to filter out events that
// don't respect NKBIP-01.
events.forEach(event => {
// Index events have no content, and they must have `title`, `d`, and `e` tags.
if (
(event.content != null && event.content.length > 0)
|| event.getMatchingTags('title').length === 0
|| event.getMatchingTags('d').length === 0
|| event.getMatchingTags('e').length === 0
) {
events.delete(event);
}
});
console.debug(`Filtered index events: ${events.size} events remaining.`);
return events;
}
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