"N" keyboard shortcut to open a new post modal (#5197)

* feat: Add hook on web app to open composer with 'N' keyboard shortcut

* Extract, don't fire open composer if already open

* Ignore interactive elements

---------

Co-authored-by: João Gabriel <joaog@nocorp.io>
Co-authored-by: Hailey <me@haileyok.com>

src/App.web.tsx

@@ -35,6 +35,7 @@ import {
 } from '#/state/session'
 import {readLastActiveAccount} from '#/state/session/util'
 import {Provider as ShellStateProvider} from '#/state/shell'
+import {useComposerKeyboardShortcut} from '#/state/shell/composer/useComposerKeyboardShortcut'
 import {Provider as LoggedOutViewProvider} from '#/state/shell/logged-out'
 import {Provider as ProgressGuideProvider} from '#/state/shell/progress-guide'
 import {Provider as SelectedFeedProvider} from '#/state/shell/selected-feed'
@@ -62,6 +63,8 @@ function InnerApp() {
   useIntentHandler()
   const hasCheckedReferrer = useStarterPackEntry()
 
+  useComposerKeyboardShortcut()
+
   // init
   useEffect(() => {
     async function onLaunch(account?: SessionAccount) {

src/state/shell/composer/useComposerKeyboardShortcut.tsx

@@ -0,0 +1,49 @@
+import React from 'react'
+
+import {useComposerControls} from './'
+
+/**
+ * Based on {@link https://github.com/jaywcjlove/hotkeys-js/blob/b0038773f3b902574f22af747f3bb003a850f1da/src/index.js#L51C1-L64C2}
+ */
+function shouldIgnore(event: KeyboardEvent) {
+  const target: any = event.target || event.srcElement
+  if (!target) return false
+  const {tagName} = target
+  if (!tagName) return false
+  const isInput =
+    tagName === 'INPUT' &&
+    ![
+      'checkbox',
+      'radio',
+      'range',
+      'button',
+      'file',
+      'reset',
+      'submit',
+      'color',
+    ].includes(target.type)
+  // ignore: isContentEditable === 'true', <input> and <textarea> when readOnly state is false, <select>
+  if (
+    target.isContentEditable ||
+    ((isInput || tagName === 'TEXTAREA' || tagName === 'SELECT') &&
+      !target.readOnly)
+  ) {
+    return true
+  }
+  return false
+}
+
+export function useComposerKeyboardShortcut() {
+  const {openComposer} = useComposerControls()
+
+  React.useEffect(() => {
+    function handler(event: KeyboardEvent) {
+      if (shouldIgnore(event)) return
+      if (event.key === 'n' || event.key === 'N') {
+        openComposer({})
+      }
+    }
+    document.addEventListener('keydown', handler)
+    return () => document.removeEventListener('keydown', handler)
+  }, [openComposer])
+}