function timelineGetDataBlock(i){
      var tb = document.getElementById('timeline-data-' + i);
      return tb ? JSON.parse(tb.textContent || tb.innerText) : null;
    }
    function timelineGetRowInfo(id){
      var ti;
      for(var i=0; ti=timelineGetDataBlock(i); i++){
        // NOTE: `ti.rowinfo' only available if data block contains check-ins.
        for( var k=0; k<ti.rowinfo.length; k++ ){
        for( var k=0; ti.rowinfo && k<ti.rowinfo.length; k++ ){
          if( id=='m' + ti.rowinfo[k].id ) return {
            'baseurl': ti.baseUrl,
            'filehash': ti.fileDiff,
            'hashdigits': ti.hashDigits,
            'hash': ti.rowinfo[k].h,
            'branch': ti.rowinfo[k].br
          };