Show suggested follows on search screen in mobile layout (#9010)

Reminder: Suggestions were added in #7918 and are based on who you
interact with who you do not follow. E.g. if you boost someone a lot
from seeing other people's boosts of that person, it makes sense you
might be interested in following the original source; or if you reply
to someone a lot, maybe you'd want to follow them

Each suggestion can be dismissed

app/javascript/mastodon/actions/suggestions.js

@@ -0,0 +1,52 @@
+import api from '../api';
+import { importFetchedAccounts } from './importer';
+
+export const SUGGESTIONS_FETCH_REQUEST = 'SUGGESTIONS_FETCH_REQUEST';
+export const SUGGESTIONS_FETCH_SUCCESS = 'SUGGESTIONS_FETCH_SUCCESS';
+export const SUGGESTIONS_FETCH_FAIL    = 'SUGGESTIONS_FETCH_FAIL';
+
+export const SUGGESTIONS_DISMISS = 'SUGGESTIONS_DISMISS';
+
+export function fetchSuggestions() {
+  return (dispatch, getState) => {
+    dispatch(fetchSuggestionsRequest());
+
+    api(getState).get('/api/v1/suggestions').then(response => {
+      dispatch(importFetchedAccounts(response.data));
+      dispatch(fetchSuggestionsSuccess(response.data));
+    }).catch(error => dispatch(fetchSuggestionsFail(error)));
+  };
+};
+
+export function fetchSuggestionsRequest() {
+  return {
+    type: SUGGESTIONS_FETCH_REQUEST,
+    skipLoading: true,
+  };
+};
+
+export function fetchSuggestionsSuccess(accounts) {
+  return {
+    type: SUGGESTIONS_FETCH_SUCCESS,
+    accounts,
+    skipLoading: true,
+  };
+};
+
+export function fetchSuggestionsFail(error) {
+  return {
+    type: SUGGESTIONS_FETCH_FAIL,
+    error,
+    skipLoading: true,
+    skipAlert: true,
+  };
+};
+
+export const dismissSuggestion = accountId => (dispatch, getState) => {
+  dispatch({
+    type: SUGGESTIONS_DISMISS,
+    id: accountId,
+  });
+
+  api(getState).delete(`/api/v1/suggestions/${accountId}`);
+};

app/javascript/mastodon/components/account.js

@@ -30,6 +30,9 @@ class Account extends ImmutablePureComponent {
     onMuteNotifications: PropTypes.func.isRequired,
     intl: PropTypes.object.isRequired,
     hidden: PropTypes.bool,
+    actionIcon: PropTypes.string,
+    actionTitle: PropTypes.string,
+    onActionClick: PropTypes.func,
   };
 
   handleFollow = () => {
@@ -52,8 +55,12 @@ class Account extends ImmutablePureComponent {
     this.props.onMuteNotifications(this.props.account, false);
   }
 
+  handleAction = () => {
+    this.props.onActionClick(this.props.account);
+  }
+
   render () {
-    const { account, intl, hidden } = this.props;
+    const { account, intl, hidden, onActionClick, actionIcon, actionTitle } = this.props;
 
     if (!account) {
       return <div />;
@@ -70,7 +77,9 @@ class Account extends ImmutablePureComponent {
 
     let buttons;
 
-    if (account.get('id') !== me && account.get('relationship', null) !== null) {
+    if (onActionClick && actionIcon) {
+      buttons = <IconButton icon={actionIcon} title={actionTitle} onClick={this.handleAction} />;
+    } else if (account.get('id') !== me && account.get('relationship', null) !== null) {
       const following = account.getIn(['relationship', 'following']);
       const requested = account.getIn(['relationship', 'requested']);
       const blocking  = account.getIn(['relationship', 'blocking']);

app/javascript/mastodon/features/compose/components/search_results.js

@@ -1,19 +1,56 @@
 import React from 'react';
+import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
-import { FormattedMessage } from 'react-intl';
+import { FormattedMessage, defineMessages, injectIntl } from 'react-intl';
 import AccountContainer from '../../../containers/account_container';
 import StatusContainer from '../../../containers/status_container';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import Hashtag from '../../../components/hashtag';
 
-export default class SearchResults extends ImmutablePureComponent {
+const messages = defineMessages({
+  dismissSuggestion: { id: 'suggestions.dismiss', defaultMessage: 'Dismiss suggestion' },
+});
+
+export default @injectIntl
+class SearchResults extends ImmutablePureComponent {
 
   static propTypes = {
     results: ImmutablePropTypes.map.isRequired,
+    suggestions: ImmutablePropTypes.list.isRequired,
+    fetchSuggestions: PropTypes.func.isRequired,
+    dismissSuggestion: PropTypes.func.isRequired,
+    intl: PropTypes.object.isRequired,
   };
 
+  componentDidMount () {
+    this.props.fetchSuggestions();
+  }
+
   render () {
-    const { results } = this.props;
+    const { intl, results, suggestions, dismissSuggestion } = this.props;
+
+    if (results.isEmpty() && !suggestions.isEmpty()) {
+      return (
+        <div className='search-results'>
+          <div className='trends'>
+            <div className='trends__header'>
+              <i className='fa fa-user-plus fa-fw' />
+              <FormattedMessage id='suggestions.header' defaultMessage='You might be interested in…' />
+            </div>
+
+            {suggestions && suggestions.map(accountId => (
+              <AccountContainer
+                key={accountId}
+                id={accountId}
+                actionIcon='times'
+                actionTitle={intl.formatMessage(messages.dismissSuggestion)}
+                onActionClick={dismissSuggestion}
+              />
+            ))}
+          </div>
+        </div>
+      );
+    }
 
     let accounts, statuses, hashtags;
     let count = 0;

app/javascript/mastodon/features/compose/containers/search_results_container.js

@@ -1,8 +1,15 @@
 import { connect } from 'react-redux';
 import SearchResults from '../components/search_results';
+import { fetchSuggestions, dismissSuggestion } from '../../../actions/suggestions';
 
 const mapStateToProps = state => ({
   results: state.getIn(['search', 'results']),
+  suggestions: state.getIn(['suggestions', 'items']),
 });
 
-export default connect(mapStateToProps)(SearchResults);
+const mapDispatchToProps = dispatch => ({
+  fetchSuggestions: () => dispatch(fetchSuggestions()),
+  dismissSuggestion: account => dispatch(dismissSuggestion(account.get('id'))),
+});
+
+export default connect(mapStateToProps, mapDispatchToProps)(SearchResults);

app/javascript/mastodon/reducers/index.js

@@ -28,6 +28,7 @@ import lists from './lists';
 import listEditor from './list_editor';
 import filters from './filters';
 import conversations from './conversations';
+import suggestions from './suggestions';
 
 const reducers = {
   dropdown_menu,
@@ -59,6 +60,7 @@ const reducers = {
   listEditor,
   filters,
   conversations,
+  suggestions,
 };
 
 export default combineReducers(reducers);

app/javascript/mastodon/reducers/suggestions.js

@@ -0,0 +1,30 @@
+import {
+  SUGGESTIONS_FETCH_REQUEST,
+  SUGGESTIONS_FETCH_SUCCESS,
+  SUGGESTIONS_FETCH_FAIL,
+  SUGGESTIONS_DISMISS,
+} from '../actions/suggestions';
+import { Map as ImmutableMap, List as ImmutableList, fromJS } from 'immutable';
+
+const initialState = ImmutableMap({
+  items: ImmutableList(),
+  isLoading: false,
+});
+
+export default function suggestionsReducer(state = initialState, action) {
+  switch(action.type) {
+  case SUGGESTIONS_FETCH_REQUEST:
+    return state.set('isLoading', true);
+  case SUGGESTIONS_FETCH_SUCCESS:
+    return state.withMutations(map => {
+      map.set('items', fromJS(action.accounts.map(x => x.id)));
+      map.set('isLoading', false);
+    });
+  case SUGGESTIONS_FETCH_FAIL:
+    return state.set('isLoading', false);
+  case SUGGESTIONS_DISMISS:
+    return state.update('items', list => list.filterNot(id => id === action.id));
+  default:
+    return state;
+  }
+};