Search custom feeds (#1031)

* paginate custom feeds

* basic search

* update `@atproto/api`

* use search from the API

* debounce search for 200ms

src/view/screens/DiscoverFeeds.tsx

@@ -14,6 +14,8 @@ import {isDesktopWeb} from 'platform/detection'
 import {usePalette} from 'lib/hooks/usePalette'
 import {s} from 'lib/styles'
 import {CustomFeedModel} from 'state/models/feeds/custom-feed'
+import {HeaderWithInput} from 'view/com/search/HeaderWithInput'
+import debounce from 'lodash.debounce'
 
 type Props = NativeStackScreenProps<CommonNavigatorParams, 'DiscoverFeeds'>
 export const DiscoverFeedsScreen = withAuthRequired(
@@ -22,6 +24,37 @@ export const DiscoverFeedsScreen = withAuthRequired(
     const pal = usePalette('default')
     const feeds = React.useMemo(() => new FeedsDiscoveryModel(store), [store])
 
+    // search stuff
+    const [isInputFocused, setIsInputFocused] = React.useState<boolean>(false)
+    const [query, setQuery] = React.useState<string>('')
+    const debouncedSearchFeeds = React.useMemo(
+      () => debounce(() => feeds.search(query), 200), // debouce for 200 ms
+      [feeds, query],
+    )
+    const onChangeQuery = React.useCallback(
+      (text: string) => {
+        setQuery(text)
+        if (text.length > 1) {
+          debouncedSearchFeeds()
+        } else {
+          feeds.refresh()
+        }
+      },
+      [debouncedSearchFeeds, feeds],
+    )
+    const onPressClearQuery = React.useCallback(() => {
+      setQuery('')
+      feeds.refresh()
+    }, [feeds])
+    const onPressCancelSearch = React.useCallback(() => {
+      setIsInputFocused(false)
+      setQuery('')
+      feeds.refresh()
+    }, [feeds])
+    const onSubmitQuery = React.useCallback(() => {
+      feeds.search(query)
+    }, [feeds, query])
+
     useFocusEffect(
       React.useCallback(() => {
         store.shell.setMinimalShellMode(false)
@@ -68,6 +101,16 @@ export const DiscoverFeedsScreen = withAuthRequired(
       <CenteredView style={[styles.container, pal.view]}>
         <View style={[isDesktopWeb && styles.containerDesktop, pal.border]}>
           <ViewHeader title="Discover Feeds" showOnDesktop />
+          <HeaderWithInput
+            isInputFocused={isInputFocused}
+            query={query}
+            setIsInputFocused={setIsInputFocused}
+            onChangeQuery={onChangeQuery}
+            onPressClearQuery={onPressClearQuery}
+            onPressCancelSearch={onPressCancelSearch}
+            onSubmitQuery={onSubmitQuery}
+            showMenu={false}
+          />
         </View>
         <FlatList
           style={[!isDesktopWeb && s.flex1]}