gistfile1.js

function (head, req) {
  var CACHED_COUNT=0;
  var CACHED_REV=1;
  var CURRENT_COUNT=2;
  var row;
  var lastRow = null;
  function currAdd(curr, row) {
    var k = row.key[0];
    var t = row.key[1];
    curr['key'] = k;
    if(t == CACHED_REV) {
      curr['rev'] = row.key[2];
    }
    else if (t == CACHED_COUNT) {
      curr['old_value'] = row.key[2];
    }
    else if (t == CURRENT_COUNT) {
      curr['new_value'] = row.value;
    }
  }
  function iterate() {
    var curr = {'key':null,'old_value':0,'new_value':0};
    var found = false;
    if (lastRow) {
      currAdd(curr, lastRow);
      found = true;
    }
    while (row = getRow()) {
      if (lastRow && (row.key[0] != lastRow.key[0])) {
        lastRow = row;
        return curr;
      }
      currAdd(curr, row);
      found = true;
      lastRow = row;
    }
    lastRow = null;
    return found ? curr : null;
  }
  provides("json", function() {
    start({"headers": { "Content-Type": "text/plain"} });
    var cnt=0;
    while (row = iterate()) {
      var v = {
        _id: 'cached_likes_count:'+row.key,
        value: row.new_value
      };
      if (row.rev) {
        v._rev = row.rev;
      }
      if (row.old_value != row.new_value) {
        send((cnt++?',' : '{"docs":[\
 ') + toJSON(v) + '\
');
      }
    }
    return (cnt?'':'{"docs":[')+']}\
';
  });
}