feat(snapshot): output-writer (index.json + posts/<slug>.json)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

snapshot/src/core/output.ts

@@ -0,0 +1,41 @@
+import { ensureDir } from '@std/fs'
+import { join } from '@std/path'
+import type { PostJson } from './post-json.ts'
+
+export interface OutputInput {
+  generatedAt: string
+  authorPubkey: string
+  relaysQueried: string[]
+  relaysResponded: string[]
+  posts: PostJson[]
+}
+
+export async function writeOutput(outDir: string, input: OutputInput): Promise<void> {
+  await ensureDir(outDir)
+  await ensureDir(join(outDir, 'posts'))
+
+  const index = {
+    generated_at: input.generatedAt,
+    author_pubkey: input.authorPubkey,
+    relays_queried: input.relaysQueried,
+    relays_responded: input.relaysResponded,
+    post_count: input.posts.length,
+    posts: input.posts.map((p) => ({
+      slug: p.slug,
+      lang: p.lang,
+      created_at: p.created_at,
+      title: p.title,
+    })),
+  }
+  await Deno.writeTextFile(
+    join(outDir, 'index.json'),
+    JSON.stringify(index, null, 2) + '\n',
+  )
+
+  for (const post of input.posts) {
+    await Deno.writeTextFile(
+      join(outDir, 'posts', `${post.slug}.json`),
+      JSON.stringify(post, null, 2) + '\n',
+    )
+  }
+}

snapshot/tests/output.test.ts

@@ -0,0 +1,36 @@
+import { assertEquals } from '@std/assert'
+import { join } from '@std/path'
+import { writeOutput } from '../src/core/output.ts'
+import type { PostJson } from '../src/core/post-json.ts'
+
+const samplePost: PostJson = {
+  slug: 'a', event_id: 'e1', created_at: 1, published_at: 1,
+  title: 'A', summary: 's', lang: 'de', cover_image: null,
+  content_markdown: '# A', tags: [], naddr: 'naddr1', habla_url: 'https://habla.news/a/naddr1',
+  translations: [],
+}
+
+Deno.test('writeOutput schreibt index.json + posts/<slug>.json', async () => {
+  const dir = await Deno.makeTempDir()
+  await writeOutput(dir, {
+    generatedAt: '2026-04-28T10:00:00Z',
+    authorPubkey: 'P',
+    relaysQueried: ['wss://r1', 'wss://r2'],
+    relaysResponded: ['wss://r1'],
+    posts: [samplePost],
+  })
+
+  const indexText = await Deno.readTextFile(join(dir, 'index.json'))
+  const index = JSON.parse(indexText)
+  assertEquals(index.author_pubkey, 'P')
+  assertEquals(index.post_count, 1)
+  assertEquals(index.posts.length, 1)
+  assertEquals(index.posts[0].slug, 'a')
+  assertEquals(index.posts[0].title, 'A')
+  assertEquals(index.posts[0].lang, 'de')
+
+  const postText = await Deno.readTextFile(join(dir, 'posts', 'a.json'))
+  const post = JSON.parse(postText)
+  assertEquals(post.slug, 'a')
+  assertEquals(post.content_markdown, '# A')
+})