From f960379783d3720bd7a72e0695649a1d2cb0b898 Mon Sep 17 00:00:00 2001
From: Jackson Harper <jacksonh@gmail.com>
Date: Fri, 13 Oct 2023 17:50:38 +0800
Subject: [PATCH] Allow navigating to next/previous items on the web with
 keyboard

---
 .../templates/article/ArticleActionsMenu.tsx  |  2 +-
 .../templates/homeFeed/HomeFeedContainer.tsx  |  9 +++
 .../web/pages/[username]/[slug]/index.tsx     | 62 +++++++++++++++++--
 3 files changed, 66 insertions(+), 7 deletions(-)

diff --git a/packages/web/components/templates/article/ArticleActionsMenu.tsx b/packages/web/components/templates/article/ArticleActionsMenu.tsx
index c71c65700..201dd9d4d 100644
--- a/packages/web/components/templates/article/ArticleActionsMenu.tsx
+++ b/packages/web/components/templates/article/ArticleActionsMenu.tsx
@@ -180,7 +180,7 @@ export function ArticleActionsMenu(
           </Button>
         ) : (
           <Button
-            title="Unarchive (u)"
+            title="Unarchive (e)"
             style="articleActionIcon"
             onClick={() => props.articleActionHandler('unarchive')}
           >
diff --git a/packages/web/components/templates/homeFeed/HomeFeedContainer.tsx b/packages/web/components/templates/homeFeed/HomeFeedContainer.tsx
index fae67ae68..fa8476091 100644
--- a/packages/web/components/templates/homeFeed/HomeFeedContainer.tsx
+++ b/packages/web/components/templates/homeFeed/HomeFeedContainer.tsx
@@ -191,6 +191,15 @@ export function HomeFeedContainer(): JSX.Element {
     return items
   }, [itemsPages, performActionOnItem])
 
+  useEffect(() => {
+    if (localStorage) {
+      localStorage.setItem(
+        'library-slug-list',
+        JSON.stringify(libraryItems.map((li) => li.node.slug))
+      )
+    }
+  }, [libraryItems])
+
   useEffect(() => {
     const timeout: NodeJS.Timeout[] = []
 
diff --git a/packages/web/pages/[username]/[slug]/index.tsx b/packages/web/pages/[username]/[slug]/index.tsx
index 30cc92b46..2acd23610 100644
--- a/packages/web/pages/[username]/[slug]/index.tsx
+++ b/packages/web/pages/[username]/[slug]/index.tsx
@@ -78,6 +78,34 @@ export default function Home(): JSX.Element {
     })
   }, [articleData?.article.article])
 
+  const goNextOrHome = useCallback(() => {
+    const listStr = localStorage.getItem('library-slug-list')
+    if (article && listStr && viewerData?.me) {
+      const libraryList = JSON.parse(listStr) as string[]
+      const idx = libraryList.findIndex((slug) => slug == article.slug)
+      if (idx != -1 && idx < libraryList.length - 1) {
+        const nextSlug = libraryList[idx + 1] as string
+        router.push(`/${viewerData?.me.profile.username}/${nextSlug}`)
+        return
+      }
+    }
+    router.push(`/home`)
+  }, [router, viewerData, article])
+
+  const goPreviousOrHome = useCallback(() => {
+    const listStr = localStorage.getItem('library-slug-list')
+    if (article && listStr && viewerData?.me) {
+      const libraryList = JSON.parse(listStr) as string[]
+      const idx = libraryList.findIndex((slug) => slug == article.slug)
+      if (idx > 0) {
+        const previousSlug = libraryList[idx - 1] as string
+        router.push(`/${viewerData?.me.profile.username}/${previousSlug}`)
+        return
+      }
+    }
+    router.push(`/home`)
+  }, [router, viewerData, article])
+
   const actionHandler = useCallback(
     async (action: string, arg?: unknown) => {
       switch (action) {
@@ -99,8 +127,7 @@ export default function Home(): JSX.Element {
                 })
               }
             })
-
-            router.push(`/home`)
+            goNextOrHome()
           }
           break
         case 'archive':
@@ -116,7 +143,7 @@ export default function Home(): JSX.Element {
                   position: 'bottom-right',
                 })
               } else {
-                router.push(`/home`)
+                goNextOrHome()
                 showSuccessToast('Page archived', {
                   position: 'bottom-right',
                 })
@@ -138,7 +165,7 @@ export default function Home(): JSX.Element {
                   position: 'bottom-right',
                 })
               } else {
-                router.push(`/home`)
+                goNextOrHome()
               }
             })
           }
@@ -169,7 +196,7 @@ export default function Home(): JSX.Element {
           break
       }
     },
-    [article, cache, mutate, router, readerSettings]
+    [article, viewerData, cache, mutate, router, readerSettings]
   )
 
   useEffect(() => {
@@ -197,14 +224,19 @@ export default function Home(): JSX.Element {
     document.addEventListener('openOriginalArticle', openOriginalArticle)
     document.addEventListener('showEditModal', showEditModal)
 
+    document.addEventListener('goNextOrHome', goNextOrHome)
+    document.addEventListener('goPreviousOrHome', goPreviousOrHome)
+
     return () => {
       document.removeEventListener('archive', archive)
       document.removeEventListener('mark-read', markRead)
       document.removeEventListener('delete', deletePage)
       document.removeEventListener('openOriginalArticle', openOriginalArticle)
       document.removeEventListener('showEditModal', showEditModal)
+      document.removeEventListener('goNextOrHome', goNextOrHome)
+      document.removeEventListener('goPreviousOrHome', goPreviousOrHome)
     }
-  }, [actionHandler])
+  }, [actionHandler, goNextOrHome, goPreviousOrHome])
 
   useEffect(() => {
     if (article && viewerData?.me) {
@@ -386,6 +418,24 @@ export default function Home(): JSX.Element {
         shortcut: ['i'],
         perform: () => setShowEditModal(true),
       },
+      {
+        id: 'go_previous',
+        section: 'Article',
+        name: 'Go to Previous',
+        shortcut: ['g', 'p'],
+        perform: () => {
+          document.dispatchEvent(new Event('goPreviousOrHome'))
+        },
+      },
+      {
+        id: 'go_next',
+        section: 'Article',
+        name: 'Go to Next',
+        shortcut: ['g', 'n'],
+        perform: () => {
+          document.dispatchEvent(new Event('goNextOrHome'))
+        },
+      },
     ],
     [readerSettings, showHighlightsModal]
   )