【RFC-062】 在文章和问题页面加入一键Archive按钮

// ==UserScript==

// @name        PincongArchive

// @namespace   PincongArchive

// @match       https://pincong.rocks/article/*

// @version     1

// @grant       none

// @run-at      document-end

// ==/UserScript==



(function(){

    let doc=document;

    let newtag=function(t){return doc.createElement(t);}

    let newtext=function(s){return doc.createTextNode(s);}

    let selid=function(i){return doc.getElementById(i);}

    let selcss1=function(c,r){return (r?r:doc).querySelector(c);}

    let appendnode=function(r,n){n?r.appendChild(n):null;}



    let archive='https://web.archive.org/';



    let checkavl=function(url){

        let req=new Request(archive+'wayback/available?url='+url,

                            {'method':'GET','redirect':'error'});

        fetch(req).then(function(resp){

            return resp.json();

        }).then(function(data){

            let con=selid('PincongArchive-counter');

            let a=selid('PincongArchive-link');

            let c=data['archived_snapshots']['closest'];

            if(c){

                a.href=c['url'];

                con.textContent='archived at '+c['timestamp'];

            }else{

                a.href=archive+'save/'+url;

                con.textContent='not archived';

            }

        })

    }



    let createui=function(){

        let parent=selcss1('nav>ul.nav');

        if(!parent)return;



        let url=location.href;

        let root=newtag('li');

        let a=newtag('a');

        let con=newtag('span');

        appendnode(parent,root);

        appendnode(root,a);

        appendnode(a,newtext('PincongArchive'));

        appendnode(a,con);

        appendnode(con,newtext('checking...'));



        a.id='PincongArchive-link';

        con.id='PincongArchive-counter';

    }



    createui();

})()