feat: save mobile note frontmatter

apps/mobile/src/mobileNoteFrontmatterSave.ts

@@ -0,0 +1,41 @@
+import type { MobileVaultConfig } from './mobileVaultConfig'
+import type { MobileVaultStorageDriver } from './mobileVaultStorage'
+import {
+  writeMobileNoteFrontmatter,
+  type WritableMobileNoteFrontmatter,
+} from './mobileNoteFrontmatterWrite'
+
+export type MobileNoteFrontmatterSaveResult =
+  | {
+      status: 'saved'
+      path: string
+    }
+  | {
+      status: 'missing'
+      path: string
+    }
+
+export async function saveMobileNoteFrontmatter({
+  metadata,
+  noteId,
+  storage,
+  vault,
+}: {
+  metadata: WritableMobileNoteFrontmatter
+  noteId: string
+  storage: MobileVaultStorageDriver
+  vault: MobileVaultConfig
+}): Promise<MobileNoteFrontmatterSaveResult> {
+  const path = notePath(noteId)
+  const content = await storage.readMarkdownFile(vault, path)
+  if (content === null) {
+    return { status: 'missing', path }
+  }
+
+  await storage.writeMarkdownFile(vault, path, writeMobileNoteFrontmatter({ content, metadata }))
+  return { status: 'saved', path }
+}
+
+function notePath(noteId: string) {
+  return `${noteId}.md`
+}