Add option to show only local toots in timeline preview (#6292)

* Add option to show only local toots in timeline preview
Right know, toots from all the known fediverse are shown in the main
page of an instance. That however doesn't reflect the instance itself.
With this option the admin may choose to display only local toots so
that users checking the instance get a better idea of internal
conversations.

* Fix issues pointed by codeclimate and eslint

* Add default message for community timeline

* Update pl.yml

app/javascript/mastodon/containers/timeline_container.js

@@ -6,6 +6,7 @@ import { hydrateStore } from '../actions/store';
 import { IntlProvider, addLocaleData } from 'react-intl';
 import { getLocale } from '../locales';
 import PublicTimeline from '../features/standalone/public_timeline';
+import CommunityTimeline from '../features/standalone/community_timeline';
 import HashtagTimeline from '../features/standalone/hashtag_timeline';
 import initialState from '../initial_state';
 
@@ -23,17 +24,24 @@ export default class TimelineContainer extends React.PureComponent {
   static propTypes = {
     locale: PropTypes.string.isRequired,
     hashtag: PropTypes.string,
+    showPublicTimeline: PropTypes.bool.isRequired,
+  };
+
+  static defaultProps = {
+    showPublicTimeline: initialState.settings.known_fediverse,
   };
 
   render () {
-    const { locale, hashtag } = this.props;
+    const { locale, hashtag, showPublicTimeline } = this.props;
 
     let timeline;
 
     if (hashtag) {
       timeline = <HashtagTimeline hashtag={hashtag} />;
-    } else {
+    } else if (showPublicTimeline) {
       timeline = <PublicTimeline />;
+    } else {
+      timeline = <CommunityTimeline />;
     }
 
     return (

app/javascript/mastodon/features/standalone/community_timeline/index.js

@@ -0,0 +1,74 @@
+import React from 'react';
+import { connect } from 'react-redux';
+import PropTypes from 'prop-types';
+import StatusListContainer from '../../ui/containers/status_list_container';
+import {
+  refreshCommunityTimeline,
+  expandCommunityTimeline,
+} from '../../../actions/timelines';
+import Column from '../../../components/column';
+import ColumnHeader from '../../../components/column_header';
+import { defineMessages, injectIntl } from 'react-intl';
+import { connectCommunityStream } from '../../../actions/streaming';
+
+const messages = defineMessages({
+  title: { id: 'standalone.public_title', defaultMessage: 'A look inside...' },
+});
+
+@connect()
+@injectIntl
+export default class CommunityTimeline extends React.PureComponent {
+
+  static propTypes = {
+    dispatch: PropTypes.func.isRequired,
+    intl: PropTypes.object.isRequired,
+  };
+
+  handleHeaderClick = () => {
+    this.column.scrollTop();
+  }
+
+  setRef = c => {
+    this.column = c;
+  }
+
+  componentDidMount () {
+    const { dispatch } = this.props;
+
+    dispatch(refreshCommunityTimeline());
+    this.disconnect = dispatch(connectCommunityStream());
+  }
+
+  componentWillUnmount () {
+    if (this.disconnect) {
+      this.disconnect();
+      this.disconnect = null;
+    }
+  }
+
+  handleLoadMore = () => {
+    this.props.dispatch(expandCommunityTimeline());
+  }
+
+  render () {
+    const { intl } = this.props;
+
+    return (
+      <Column ref={this.setRef}>
+        <ColumnHeader
+          icon='users'
+          title={intl.formatMessage(messages.title)}
+          onClick={this.handleHeaderClick}
+        />
+
+        <StatusListContainer
+          timelineId='community'
+          loadMore={this.handleLoadMore}
+          scrollKey='standalone_public_timeline'
+          trackScroll={false}
+        />
+      </Column>
+    );
+  }
+
+}

app/javascript/mastodon/locales/defaultMessages.json

@@ -1230,6 +1230,15 @@
     ],
     "path": "app/javascript/mastodon/features/public_timeline/index.json"
   },
+  {
+    "descriptors": [
+      {
+        "defaultMessage": "A look inside...",
+        "id": "standalone.public_title"
+      }
+    ],
+    "path": "app/javascript/mastodon/features/standalone/community_timeline/index.json"
+  },
   {
     "descriptors": [
       {