mastodon/app/assets/javascripts/components/features/status/index.jsx

import { connect }              from 'react-redux';
import PureRenderMixin          from 'react-addons-pure-render-mixin';
import ImmutablePropTypes       from 'react-immutable-proptypes';
import { fetchStatus }          from '../../actions/statuses';
import Immutable                from 'immutable';
import EmbeddedStatus           from '../../components/status';

function selectStatus(state, id) {
  let status = state.getIn(['timelines', 'statuses', id]);

  status = status.set('account', state.getIn(['timelines', 'accounts', status.get('account')]));

  if (status.get('reblog') !== null) {
    status = status.set('reblog', selectStatus(state, status.get('reblog')));
  }

  return status;
};

function selectStatuses(state, ids) {
  return ids.map(id => selectStatus(state, id));
};

const mapStateToProps = (state, props) => ({
  status: selectStatus(state, Number(props.params.statusId)),
  ancestors: selectStatuses(state, state.getIn(['timelines', 'ancestors', Number(props.params.statusId)], Immutable.List())),
  descendants: selectStatuses(state, state.getIn(['timelines', 'descendants', Number(props.params.statusId)], Immutable.List()))
});

const Status = React.createClass({

  propTypes: {
    params: React.PropTypes.object.isRequired,
    dispatch: React.PropTypes.func.isRequired,
    status: ImmutablePropTypes.map,
    ancestors: ImmutablePropTypes.list.isRequired,
    descendants: ImmutablePropTypes.list.isRequired
  },

  mixins: [PureRenderMixin],

  componentWillMount () {
    this.props.dispatch(fetchStatus(this.props.params.statusId));
  },

  componentWillReceiveProps (nextProps) {
    if (nextProps.params.statusId !== this.props.params.statusId && nextProps.params.statusId) {
      this.props.dispatch(fetchStatus(nextProps.params.statusId));
    }
  },

  renderChildren (list) {
    return list.map(s => <EmbeddedStatus status={s} key={s.get('id')} />);
  },

  render () {
    const { status, ancestors, descendants } = this.props;

    if (status === null) {
      return <div>Loading {this.props.params.statusId}...</div>;
    }

    return (
      <div>
        {this.renderChildren(ancestors)}
        <EmbeddedStatus status={status} />
        {this.renderChildren(descendants)}
      </div>
    );
  }

});

export default connect(mapStateToProps)(Status);