commit

src/main/fs-service.ts

@@ -1,4 +1,4 @@
-import { mkdir, readdir, readFile, rm, stat, writeFile } from 'node:fs/promises'
+import { mkdir, readdir, readFile, rename, rm, stat, writeFile } from 'node:fs/promises'
 import { dirname, join, relative, sep } from 'node:path'
 import { listFiles, rgAvailable } from './search-service'
 
@@ -261,6 +261,29 @@ export async function createProjectDir(root: string, rel: string): Promise<void>
   await mkdir(target, { recursive: true })
 }
 
+/**
+ * Rename a project file or folder. `rel` is the current relative path, `name`
+ * the new basename (no slashes — a rename stays in the same folder). Returns the
+ * new relative path. Refuses to escape the project root and throws if the target
+ * name is already taken, so a rename never clobbers an existing file.
+ */
+export async function renameProjectEntry(root: string, rel: string, name: string): Promise<string> {
+  const clean = name.trim().replace(/\/+$/, '')
+  if (!clean || clean.includes('/') || clean === '.' || clean === '..') throw new Error('invalid name')
+  const from = join(root, rel)
+  const parent = rel.includes('/') ? rel.slice(0, rel.lastIndexOf('/')) : ''
+  const next = parent ? `${parent}/${clean}` : clean
+  const to = join(root, next)
+  if (relative(root, from).startsWith('..') || relative(root, to).startsWith('..')) throw new Error('outside project root')
+  if (from === to) return rel
+  // Case-only renames (foo.md → Foo.md) hit an existing path on macOS' case
+  // insensitive filesystem, so only guard when the name really differs.
+  const sameName = from.toLowerCase() === to.toLowerCase()
+  if (!sameName && await stat(to).catch(() => null)) throw new Error('name already exists')
+  await rename(from, to)
+  return next
+}
+
 /** Delete a project file or folder (relative path). Stays inside the project root. */
 export async function deleteProjectFile(root: string, rel: string): Promise<void> {
   const target = join(root, rel)