1 files changed, 157 insertions, 0 deletions
diff --git a/src/screens/Hashtag.tsx b/src/screens/Hashtag.tsx
new file mode 100644
index 000000000..794753ea3
--- /dev/null
+++ b/src/screens/Hashtag.tsx
@@ -0,0 +1,157 @@
+import React from 'react'
+import {ListRenderItemInfo, Pressable} from 'react-native'
+import {atoms as a} from '#/alf'
+import {useFocusEffect} from '@react-navigation/native'
+import {useSetMinimalShellMode} from 'state/shell'
+import {ViewHeader} from 'view/com/util/ViewHeader'
+import {NativeStackScreenProps} from '@react-navigation/native-stack'
+import {CommonNavigatorParams} from 'lib/routes/types'
+import {useSearchPostsQuery} from 'state/queries/search-posts'
+import {Post} from 'view/com/post/Post'
+import {PostView} from '@atproto/api/dist/client/types/app/bsky/feed/defs'
+import {enforceLen} from 'lib/strings/helpers'
+import {
+  ListFooter,
+  ListHeaderDesktop,
+  ListMaybePlaceholder,
+} from '#/components/Lists'
+import {List} from 'view/com/util/List'
+import {msg} from '@lingui/macro'
+import {useLingui} from '@lingui/react'
+import {sanitizeHandle} from 'lib/strings/handles'
+import {CenteredView} from 'view/com/util/Views'
+import {ArrowOutOfBox_Stroke2_Corner0_Rounded} from '#/components/icons/ArrowOutOfBox'
+import {shareUrl} from 'lib/sharing'
+import {HITSLOP_10} from 'lib/constants'
+
+const renderItem = ({item}: ListRenderItemInfo<PostView>) => {
+  return <Post post={item} />
+}
+
+const keyExtractor = (item: PostView, index: number) => {
+  return `${item.uri}-${index}`
+}
+
+export default function HashtagScreen({
+  route,
+}: NativeStackScreenProps<CommonNavigatorParams, 'Hashtag'>) {
+  const {tag, author} = route.params
+  const setMinimalShellMode = useSetMinimalShellMode()
+  const {_} = useLingui()
+  const [isPTR, setIsPTR] = React.useState(false)
+
+  const fullTag = React.useMemo(() => {
+    return `#${tag.replaceAll('%23', '#')}`
+  }, [tag])
+
+  const queryParam = React.useMemo(() => {
+    if (!author) return fullTag
+    return `${fullTag} from:${sanitizeHandle(author)}`
+  }, [fullTag, author])
+
+  const headerTitle = React.useMemo(() => {
+    return enforceLen(fullTag.toLowerCase(), 24, true, 'middle')
+  }, [fullTag])
+
+  const sanitizedAuthor = React.useMemo(() => {
+    if (!author) return
+    return sanitizeHandle(author)
+  }, [author])
+
+  const {
+    data,
+    isFetching,
+    isLoading,
+    isRefetching,
+    isError,
+    error,
+    refetch,
+    fetchNextPage,
+    hasNextPage,
+  } = useSearchPostsQuery({query: queryParam})
+
+  const posts = React.useMemo(() => {
+    return data?.pages.flatMap(page => page.posts) || []
+  }, [data])
+
+  useFocusEffect(
+    React.useCallback(() => {
+      setMinimalShellMode(false)
+    }, [setMinimalShellMode]),
+  )
+
+  const onShare = React.useCallback(() => {
+    const url = new URL('https://bsky.app')
+    url.pathname = `/hashtag/${tag}`
+    if (author) {
+      url.searchParams.set('author', author)
+    }
+    shareUrl(url.toString())
+  }, [tag, author])
+
+  const onRefresh = React.useCallback(async () => {
+    setIsPTR(true)
+    await refetch()
+    setIsPTR(false)
+  }, [refetch])
+
+  const onEndReached = React.useCallback(() => {
+    if (isFetching || !hasNextPage || error) return
+    fetchNextPage()
+  }, [isFetching, hasNextPage, error, fetchNextPage])
+
+  return (
+    <CenteredView style={a.flex_1}>
+      <ViewHeader
+        title={headerTitle}
+        subtitle={author ? _(msg`From @${sanitizedAuthor}`) : undefined}
+        canGoBack={true}
+        renderButton={() => (
+          <Pressable
+            accessibilityRole="button"
+            onPress={onShare}
+            hitSlop={HITSLOP_10}>
+            <ArrowOutOfBox_Stroke2_Corner0_Rounded
+              size="lg"
+              onPress={onShare}
+            />
+          </Pressable>
+        )}
+      />
+      <ListMaybePlaceholder
+        isLoading={isLoading || isRefetching}
+        isError={isError}
+        isEmpty={posts.length < 1}
+        onRetry={refetch}
+        empty={_(msg`We couldn't find any results for that hashtag.`)}
+      />
+      {!isLoading && posts.length > 0 && (
+        <List<PostView>
+          data={posts}
+          renderItem={renderItem}
+          keyExtractor={keyExtractor}
+          refreshing={isPTR}
+          onRefresh={onRefresh}
+          onEndReached={onEndReached}
+          onEndReachedThreshold={4}
+          // @ts-ignore web only -prf
+          desktopFixedHeight
+          ListHeaderComponent={
+            <ListHeaderDesktop
+              title={headerTitle}
+              subtitle={author ? _(msg`From @${sanitizedAuthor}`) : undefined}
+            />
+          }
+          ListFooterComponent={
+            <ListFooter
+              isFetching={isFetching && !isRefetching}
+              isError={isError}
+              error={error?.name}
+              onRetry={fetchNextPage}
+            />
+          }
+        />
+      )}
+    </CenteredView>
+  )
+}