i find it annoying to have to manually change urls to subscribe to a community outside lemmy.world, so i wrote a bookmarklet to quickly switch to the lemmy.world instance

to use, just drag the following code to your bookmarks bar (name it whatever you like), then click it when you want to use it

javascript:(function(){const myInst="lemmy.world";let currUrl=window.location.toString().split("/");let currInst=currUrl[2];currUrl[2]=myInst;if(currUrl[3]=="m"){currUrl[3]="c";}let newUrl=currUrl.join("/");if(!(currUrl[-1].includes("@"))){newUrl=newUrl+"@"+currInst;}window.location=newUrl;})()

readable version:

javascript:(
    function() {
        // make sure to change this if using on a different instance
        const myInst="lemmy.world";
        let currUrl=window.location.toString().split("/");
        let currInst=currUrl[2];
        currUrl[2]=myInst;
        // fix for kbin using "m" instead, 
        // without overriding /u/ for user
        if (currUrl[3]=="m") {
            currUrl[3]="c";
        }
        let newUrl=currUrl.join("/");
        // fix for already foreign instances (e.g. lemm.ee/c/jerboa@lemmy.ml)
        if (!currUrl[-1].includes("@")) {
            newUrl=newUrl+"@"+currInst;
        }
        window.location=newUrl;
    })
()

javascript:(
    function() {
        // make sure to change this if using on a different instance
        const myInst="lemmy.world";
        let currUrl=window.location.toString().split("/");
        let currInst=currUrl[2];
        currUrl[2]=myInst;
        currUrl[3]="c";  // fix for kbin using "m" instead
        let newUrl=currUrl.join("/")+"@"+currInst;
        window.location=newUrl;
    })
()

update 2023-06-27: add compatibility for kbin magazines
update 2023-07-01: compatibility with users, kbin, and already foreign instances