chore: refactoring and tests (#12468)

packages/app/src/components/file-tree.tsx

@@ -8,6 +8,7 @@ import {
   createMemo,
   For,
   Match,
+  on,
   Show,
   splitProps,
   Switch,
@@ -25,6 +26,34 @@ type Filter = {
   dirs: Set<string>
 }
 
+export function shouldListRoot(input: { level: number; dir?: { loaded?: boolean; loading?: boolean } }) {
+  if (input.level !== 0) return false
+  if (input.dir?.loaded) return false
+  if (input.dir?.loading) return false
+  return true
+}
+
+export function shouldListExpanded(input: {
+  level: number
+  dir?: { expanded?: boolean; loaded?: boolean; loading?: boolean }
+}) {
+  if (input.level === 0) return false
+  if (!input.dir?.expanded) return false
+  if (input.dir.loaded) return false
+  if (input.dir.loading) return false
+  return true
+}
+
+export function dirsToExpand(input: {
+  level: number
+  filter?: { dirs: Set<string> }
+  expanded: (dir: string) => boolean
+}) {
+  if (input.level !== 0) return []
+  if (!input.filter) return []
+  return [...input.filter.dirs].filter((dir) => !input.expanded(dir))
+}
+
 export default function FileTree(props: {
   path: string
   class?: string
@@ -111,19 +140,30 @@ export default function FileTree(props: {
 
   createEffect(() => {
     const current = filter()
-    if (!current) return
-    if (level !== 0) return
-
-    for (const dir of current.dirs) {
-      const expanded = untrack(() => file.tree.state(dir)?.expanded) ?? false
-      if (expanded) continue
-      file.tree.expand(dir)
-    }
+    const dirs = dirsToExpand({
+      level,
+      filter: current,
+      expanded: (dir) => untrack(() => file.tree.state(dir)?.expanded) ?? false,
+    })
+    for (const dir of dirs) file.tree.expand(dir)
   })
 
+  createEffect(
+    on(
+      () => props.path,
+      (path) => {
+        const dir = untrack(() => file.tree.state(path))
+        if (!shouldListRoot({ level, dir })) return
+        void file.tree.list(path)
+      },
+      { defer: false },
+    ),
+  )
+
   createEffect(() => {
-    const path = props.path
-    untrack(() => void file.tree.list(path))
+    const dir = file.tree.state(props.path)
+    if (!shouldListExpanded({ level, dir })) return
+    void file.tree.list(props.path)
   })
 
   const nodes = createMemo(() => {