Tasks: adds filter by tag feature

Squash of #94

src/components/Tasks/Sidebar.tsx

@@ -0,0 +1,62 @@
+import * as React from 'react';
+
+import { useSelector, useDispatch } from 'react-redux';
+
+import InboxIcon from '@material-ui/icons/Inbox';
+import LabelIcon from '@material-ui/icons/LabelOutlined';
+
+import { setSettings } from '../../store/actions';
+import { StoreState } from '../../store';
+
+import { List, ListItem, ListSubheader } from '../../widgets/List';
+
+interface ListItemPropsType {
+  name: string | null;
+  icon?: React.ReactElement;
+  primaryText: string;
+  amount?: number;
+}
+
+function SidebarListItem(props: ListItemPropsType) {
+  const { name, icon, primaryText, amount } = props;
+  const dispatch = useDispatch();
+  const taskSettings = useSelector((state: StoreState) => state.settings.taskSettings);
+  const { filterBy } = taskSettings;
+
+  const handleClick = () => {
+    dispatch(setSettings({ taskSettings: { ...taskSettings, filterBy: name } }));
+  };
+
+  return (
+    <ListItem
+      onClick={handleClick}
+      selected={name === filterBy}
+      leftIcon={icon}
+      rightIcon={<span style={{ width: '100%', textAlign: 'right' }}>{amount}</span>}
+      primaryText={primaryText}
+    />
+  );
+}
+
+export default function Sidebar(props: { tags: Map<string, number>, totalTasks: number }) {
+  const { tags, totalTasks } = props;
+
+  const tagsList = [...tags].sort(([a], [b]) => a.localeCompare(b)).map(([tag, amount]) => (
+    <SidebarListItem
+      key={tag}
+      name={`tag:${tag}`}
+      primaryText={tag}
+      icon={<LabelIcon />}
+      amount={amount}
+    />
+  ));
+
+  return (
+    <List dense>
+      <SidebarListItem name={null} primaryText="All" icon={<InboxIcon />} amount={totalTasks} />
+
+      <ListSubheader>Tags</ListSubheader>
+      {tagsList}
+    </List>
+  );
+}

src/components/Tasks/TaskList.tsx

@@ -13,9 +13,16 @@ import { TaskType, PimType } from '../../pim-types';
 import FormControlLabel from '@material-ui/core/FormControlLabel';
 import Checkbox from '@material-ui/core/Checkbox';
 import Divider from '@material-ui/core/Divider';
+import Grid from '@material-ui/core/Grid';
+import { useTheme } from '@material-ui/core/styles';
+
+import { useSelector } from 'react-redux';
 
 import TaskListItem from './TaskListItem';
 import QuickAdd from './QuickAdd';
+import Sidebar from './Sidebar';
+
+import { StoreState } from '../../store';
 
 const sortSelector = createSelector(
   (entries: TaskType[]) => entries,
@@ -31,7 +38,26 @@ interface PropsType {
 
 export default React.memo(function TaskList(props: PropsType) {
   const [showCompleted, setShowCompleted] = React.useState(false);
-  const entries = props.entries.filter((x) => showCompleted || !x.finished);
+  const settings = useSelector((state: StoreState) => state.settings.taskSettings);
+  const { filterBy } = settings;
+  const theme = useTheme();
+
+  const potentialEntries = props.entries.filter((x) => showCompleted || !x.finished);
+  let entries;
+  const tagPrefix = 'tag:';
+  if (filterBy?.startsWith(tagPrefix)) {
+    const tag = filterBy.slice(tagPrefix.length);
+    entries = potentialEntries.filter((x) => x.tags.includes(tag));
+  } else {
+    entries = potentialEntries;
+  }
+
+  // TODO: memoize
+  const tags = new Map<string, number>();
+  potentialEntries.forEach((entry) => entry.tags.forEach((tag) => {
+    tags.set(tag, (tags.get(tag) ?? 0) + 1);
+  }));
+
   const sortedEntries = sortSelector(entries);
 
   const itemList = sortedEntries.map((entry) => {
@@ -48,8 +74,13 @@ export default React.memo(function TaskList(props: PropsType) {
   });
 
   return (
-    <>
+    <Grid container spacing={4}>
+
+      <Grid item xs={3} style={{ borderRight: `1px solid ${theme.palette.divider}` }}>
+        <Sidebar totalTasks={potentialEntries.length} tags={tags} />
+      </Grid>
 
+      <Grid item xs>
         <div style={{ display: 'flex', justifyContent: 'space-between' }}>
           {props.collections && <QuickAdd onSubmit={props.onItemSave} defaultCollection={props.collections[0]} />}
 
@@ -65,6 +96,7 @@ export default React.memo(function TaskList(props: PropsType) {
         <List>
           {itemList}
         </List>
-    </>
+      </Grid>
+    </Grid>
   );
 });

src/store/reducers.ts

@@ -272,6 +272,9 @@ export const errorsReducer = handleActions(
 // FIXME Move all the below (potentially the fetchCount ones too) to their own file
 export interface SettingsType {
   locale: string;
+  taskSettings: {
+    filterBy: string | null;
+  };
 }
 
 export const settingsReducer = handleActions(
@@ -280,5 +283,10 @@ export const settingsReducer = handleActions(
       { ...state, ...action.payload }
     ),
   },
-  { locale: 'en-gb' }
+  {
+    locale: 'en-gb',
+    taskSettings: {
+      filterBy: null,
+    },
+  }
 );

src/widgets/List.tsx

@@ -45,6 +45,7 @@ interface ListItemPropsType {
   href?: string;
   insetChildren?: boolean;
   nestedItems?: React.ReactNode[];
+  selected?: boolean;
 }
 
 export const ListItem = React.memo(function ListItem(_props: ListItemPropsType) {
@@ -60,6 +61,7 @@ export const ListItem = React.memo(function ListItem(_props: ListItemPropsType)
     style,
     insetChildren,
     nestedItems,
+    selected,
   } = _props;
 
   const extraProps = (onClick || href) ? {
@@ -74,6 +76,7 @@ export const ListItem = React.memo(function ListItem(_props: ListItemPropsType)
       <MuiListItem
         style={style}
         onClick={onClick}
+        selected={selected}
         {...(extraProps as any)}
       >
         {leftIcon && (