73 lines
2.0 KiB
JavaScript
73 lines
2.0 KiB
JavaScript
const STORAGE_KEY = 'forget_known_instances@2021-12-09';
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export const SLOTS = 5;
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function load_and_migrate_old(){
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const OLD_KEY = "forget_known_instances";
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let olddata = localStorage.getItem(OLD_KEY);
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if(olddata != null){
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olddata = JSON.parse(olddata)
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let newdata = {
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mastodon: olddata,
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misskey: [{
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"instance": "misskey.io",
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"hits": 0
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}]
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};
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known_save(newdata);
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localStorage.removeItem(OLD_KEY);
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return newdata;
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}
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}
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export function known_save(known){
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localStorage.setItem(STORAGE_KEY, JSON.stringify(known));
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}
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export function known_load(){
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const default_ = {
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mastodon:[{ "instance": "mastodon.social", "hits": 0 }],
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misskey:[{ "instance": "misskey.io", "hits": 0 }],
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};
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// this makes mastodon.social and misskey.io show up on respective first
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// buttons by default even if they are not the most popular instance
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// according to the server
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let known = localStorage.getItem(STORAGE_KEY);
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if(known){
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known = JSON.parse(known);
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} else {
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known = load_and_migrate_old();
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}
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return known || default_;
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}
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export function normalize_known(known){
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/*
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move instances with the most hits to the top SLOTS slots,
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making sure not to reorder anything that is already there
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*/
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let head = known.slice(0, SLOTS);
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let tail = known.slice(SLOTS);
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if(tail.length == 0){
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return known;
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}
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for(let i = 0; i < SLOTS; i++){
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let head_min = head.reduce((acc, cur) => acc.hits < cur.hits ? acc : cur);
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let tail_max = tail.reduce((acc, cur) => acc.hits > cur.hits ? acc : cur);
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if(head_min.hits < tail_max.hits){
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// swappy
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let i = head.indexOf(head_min);
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let j = tail.indexOf(tail_max);
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let buf = head[i];
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head[i] = tail[j];
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tail[j] = buf;
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}
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}
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return head.concat(tail)
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}
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