Jon Staab
50 lines
1.1 KiB
TypeScript
50 lines
1.1 KiB
TypeScript
import {readable} from "svelte/store"
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import {on, call} from "@welshman/lib"
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import {deriveItems} from "@welshman/store"
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import {getTopicTagValues} from "@welshman/util"
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import {repository} from "./core.js"
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export type Topic = {
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name: string
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count: number
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}
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export const topicsByName = call(() => {
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const topicsByName = new Map<string, Topic>()
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const addTopic = (name: string) => {
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const topic = topicsByName.get(name)
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if (topic) {
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topic.count++
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} else {
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topicsByName.set(name, {name, count: 1})
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}
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}
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for (const tagString of repository.eventsByTag.keys()) {
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if (tagString.startsWith("t:")) {
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addTopic(tagString.slice(2).toLowerCase())
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}
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}
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return readable<Map<string, Topic>>(topicsByName, set => {
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return on(repository, "update", ({added}) => {
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let dirty = false
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for (const event of added) {
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for (const name of getTopicTagValues(event.tags)) {
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addTopic(name)
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dirty = true
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}
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}
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if (dirty) {
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set(topicsByName)
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}
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})
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})
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})
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export const topics = deriveItems(topicsByName)
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