ellipsis.js

exports.ellipsis = function ellipsis(str, chunk, elip){
    // summary: Ellipsis some text. Break `str` into `chunk` sized
    // bites (bytes?), breaking only on full words within the `chunk` size
    //
    // str: String
    //      The string to break apart.
    // chunk: Integer:
    //      The size of the chunk
    // elip: String?
    //      Optional ellipsis marker. defaults to "..."
    //
    // returns: Array
    //      An Array containing all the broken up parts of the `str`,
    //      with `elip` delimeter included.
    
    if(str.length <= chunk){ return [str]; }

    if(!elip){ elip = "..."; }
    
    var part = str.substring(0, chunk - elip.length).replace(/\w+$/, ""),
        idx = part.length,
        sub = [part.trim() + elip],
        rest = str.substring(idx, str.length)
    ;
     
    // recursion FTW:
    sub.push.apply(sub, ellipsis(rest, chunk, elip));

    return sub; // Array
};