Direct messages column (#4514)

* Added a timeline for Direct statuses
* Lists all Direct statuses you've sent and received
* Displayed in Getting Started
* Streaming server support for direct TL

* Changes to match other timelines in 2.0

app/javascript/mastodon/features/direct_timeline/index.js

@@ -0,0 +1,104 @@
+import React from 'react';
+import { connect } from 'react-redux';
+import PropTypes from 'prop-types';
+import StatusListContainer from '../ui/containers/status_list_container';
+import Column from '../../components/column';
+import ColumnHeader from '../../components/column_header';
+import { expandDirectTimeline } from '../../actions/timelines';
+import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
+import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
+import ColumnSettingsContainer from './containers/column_settings_container';
+import { connectDirectStream } from '../../actions/streaming';
+
+const messages = defineMessages({
+  title: { id: 'column.direct', defaultMessage: 'Direct messages' },
+});
+
+const mapStateToProps = state => ({
+  hasUnread: state.getIn(['timelines', 'direct', 'unread']) > 0,
+});
+
+@connect(mapStateToProps)
+@injectIntl
+export default class DirectTimeline extends React.PureComponent {
+
+  static propTypes = {
+    dispatch: PropTypes.func.isRequired,
+    columnId: PropTypes.string,
+    intl: PropTypes.object.isRequired,
+    hasUnread: PropTypes.bool,
+    multiColumn: PropTypes.bool,
+  };
+
+  handlePin = () => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(removeColumn(columnId));
+    } else {
+      dispatch(addColumn('DIRECT', {}));
+    }
+  }
+
+  handleMove = (dir) => {
+    const { columnId, dispatch } = this.props;
+    dispatch(moveColumn(columnId, dir));
+  }
+
+  handleHeaderClick = () => {
+    this.column.scrollTop();
+  }
+
+  componentDidMount () {
+    const { dispatch } = this.props;
+
+    dispatch(expandDirectTimeline());
+    this.disconnect = dispatch(connectDirectStream());
+  }
+
+  componentWillUnmount () {
+    if (this.disconnect) {
+      this.disconnect();
+      this.disconnect = null;
+    }
+  }
+
+  setRef = c => {
+    this.column = c;
+  }
+
+  handleLoadMore = maxId => {
+    this.props.dispatch(expandDirectTimeline({ maxId }));
+  }
+
+  render () {
+    const { intl, hasUnread, columnId, multiColumn } = this.props;
+    const pinned = !!columnId;
+
+    return (
+      <Column ref={this.setRef}>
+        <ColumnHeader
+          icon='envelope'
+          active={hasUnread}
+          title={intl.formatMessage(messages.title)}
+          onPin={this.handlePin}
+          onMove={this.handleMove}
+          onClick={this.handleHeaderClick}
+          pinned={pinned}
+          multiColumn={multiColumn}
+        >
+          <ColumnSettingsContainer />
+        </ColumnHeader>
+
+        <StatusListContainer
+          trackScroll={!pinned}
+          scrollKey={`direct_timeline-${columnId}`}
+          timelineId='direct'
+          onLoadMore={this.handleLoadMore}
+          emptyMessage={<FormattedMessage id='empty_column.direct' defaultMessage="You don't have any direct messages yet. When you send or receive one, it will show up here." />}
+        />
+      </Column>
+    );
+  }
+
+}