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Run via: run_file ivryb/pg-essays-rss seed.ts\nawait refresh();\nconst essays = await fetchEssays();\nconst withDate = essays.filter((e) => e.date).length;\nconsole.log(`Seeded ${essays.length} essays (${withDate} with a date).`);\n","label",[142],"7fad420c-9472-4d24-8a29-90d256898934","scraper.ts","232ef9e2-a052-11f1-969b-1607ee4eb77e",8,["D",1787641079985],2,"import { sqlite } from \"https://esm.town/v/std/sqlite/main.ts\";\n\nexport const BASE = \"https://paulgraham.com\";\n\n// Files on paulgraham.com that are in articles.html but aren't essays.\nconst EXCLUDE = new Set([\n \"/index.html\",\n \"/bio.html\",\n \"/rss.xml\",\n \"/feed.xml\",\n]);\n\n/** Idempotent schema setup. */\nexport async function ensureSchema(): Promise {\n await sqlite.execute(`CREATE TABLE IF NOT EXISTS essays (\n url TEXT PRIMARY KEY,\n title TEXT NOT NULL,\n date TEXT,\n position INTEGER NOT NULL\n )`);\n await sqlite.execute(`CREATE TABLE IF NOT EXISTS meta (\n key TEXT PRIMARY KEY,\n value TEXT\n )`);\n}\n\nasync function fetchIndexHtml(): Promise {\n const res = await fetch(`${BASE}/articles.html`);\n if (!res.ok) throw new Error(`articles.html: HTTP ${res.status}`);\n return await res.text();\n}\n\n/** Parse the ordered (newest-first) list of essay links from the index. */\nexport function parseIndex(html: string): { title: string; url: string }[] {\n const out: { title: string; url: string }[] = [];\n const re = /]*>([\\s\\S]*?)<\\/a>/gi;\n let m: RegExpExecArray | null;\n while ((m = re.exec(html)) !== null) {\n let href = m[1];\n const text = m[2].replace(/<[^>]+>/g, \"\").replace(/\\s+/g, \" \").trim();\n if (href.startsWith(BASE)) href = new URL(href).pathname;\n // Normalize bare relative hrefs (e.g. \"greatwork.html\") to \"/greatwork.html\".\n if (!href.startsWith(\"/\")) href = \"/\" + href.split(/[?#]/)[0];\n const clean = href.split(/[?#]/)[0];\n if (!clean.endsWith(\".html\")) continue;\n if (EXCLUDE.has(clean)) continue;\n if (!text) continue;\n out.push({ title: text, url: clean });\n }\n const seen = new Set();\n return out.filter((x) => (seen.has(x.url) ? false : (seen.add(x.url), true)));\n}\n\n/**\n * Best-effort publication date from Hacker News: the earliest paulgraham.com\n * submission of the essay. Returns an ISO string or null.\n */\nasync function hnDate(title: string): Promise {\n try {\n const q = encodeURIComponent(title);\n const res = await fetch(\n `https://hn.algolia.com/api/v1/search?query=${q}&tags=story&hitsPerPage=50`,\n );\n if (!res.ok) return null;\n const data = await res.json();\n const hits: any[] = data.hits ?? [];\n let min: number | null = null;\n for (const h of hits) {\n let host = \"\";\n try {\n host = h.url ? new URL(h.url).hostname : \"\";\n } catch {\n host = \"\";\n }\n if (host === \"paulgraham.com\" || host.endsWith(\".paulgraham.com\")) {\n if (typeof h.created_at_i === \"number\" &&\n (min === null || h.created_at_i < min)) {\n min = h.created_at_i;\n }\n }\n }\n if (min === null) return null;\n return new Date(min * 1000).toISOString();\n } catch {\n return null;\n }\n}\n\n/** Run a list of async tasks with limited concurrency. */\nasync function mapLimit(\n items: T[],\n limit: number,\n fn: (item: T) => Promise,\n): Promise {\n const out: R[] = new Array(items.length);\n let next = 0;\n async function worker() {\n while (next < items.length) {\n const idx = next++;\n out[idx] = await fn(items[idx]);\n }\n }\n const workers = Array.from({ length: Math.min(limit, items.length) }, worker);\n await Promise.all(workers);\n return out;\n}\n\n/**\n * Refresh the cache: fetch the index, add any new essays (resolving their\n * dates), and backfill essays that still lack a date. Updates meta.last_check.\n */\nexport async function refresh(): Promise {\n await ensureSchema();\n\n const html = await fetchIndexHtml();\n const list = parseIndex(html);\n\n const rows = await sqlite.execute(\"SELECT url FROM essays\");\n const known = new Set(rows.rows.map((r) => r.url));\n\n // New essays plus known essays that are still missing a date.\n const needDate: { title: string; url: string; position: number }[] = [];\n for (let i = 0; i < list.length; i++) {\n const e = list[i];\n if (!known.has(e.url)) {\n needDate.push({ title: e.title, url: e.url, position: i });\n } else {\n const r = await sqlite.execute({\n sql: \"SELECT date FROM essays WHERE url = ?\",\n args: [e.url],\n });\n if (r.rows[0] && r.rows[0].date === null) {\n needDate.push({ title: e.title, url: e.url, position: i });\n }\n }\n }\n\n const dated = await mapLimit(needDate, 8, async (e) => ({\n ...e,\n date: await hnDate(e.title),\n }));\n\n for (const e of dated) {\n await sqlite.execute({\n sql: \"INSERT OR REPLACE INTO essays (url, title, date, position) VALUES (?, ?, ?, ?)\",\n args: [e.url, e.title, e.date, e.position],\n });\n }\n\n await sqlite.execute({\n sql: \"INSERT OR REPLACE INTO meta (key, value) VALUES ('last_check', ?)\",\n args: [new Date().toISOString()],\n });\n}\n\n/** Timestamp (ms) of the last successful check, or 0. */\nexport async function lastChecked(): Promise {\n const r = await sqlite.execute(\"SELECT value FROM meta WHERE key = 'last_check'\");\n if (r.rows.length === 0) return 0;\n const v = Date.parse(r.rows[0].value as string);\n return Number.isNaN(v) ? 0 : v;\n}\n\nexport interface Essay {\n title: string;\n url: string;\n date: string | null;\n}\n\n/** All essays, newest first (by date, then list position). */\nexport async function fetchEssays(): Promise {\n const r = await sqlite.execute(\n \"SELECT title, url, date FROM essays ORDER BY date DESC, position ASC\",\n );\n return r.rows.map((row) => ({\n title: row.title as string,\n url: row.url as string,\n date: row.date as string | null,\n }));\n}\n\nexport function esc(s: string): string {\n return s.replace(/&/g, \"&\").replace(//g, \">\")\n .replace(/\"/g, \""\");\n}\n\nexport function buildRss(essays: Essay[], selfUrl: string): string {\n const items = essays.map((e) => {\n const link = BASE + e.url;\n const dateEl = e.date ? `${new Date(e.date).toUTCString()}` : \"\";\n const desc = `${esc(e.title)} (Paul Graham).`;\n return `\\n ${esc(e.title)}\\n ${esc(link)}\\n ${esc(link)}\\n ${dateEl}\\n ${desc}\\n `;\n }).join(\"\\n \");\n\n return `\n\n \n Paul Graham’s Essays\n ${BASE}/articles.html\n Paul Graham’s essays, updated automatically from paulgraham.com.\n \n ${items}\n \n`;\n}\n",[152],"6433f1e8-7233-4671-844d-e203a5eb4281","refresh.ts","355c0934-a052-11f1-ad19-1607ee4eb77e",4,["D",1787641036812],"interval","import { refresh } from \"./scraper.ts\";\n\n/** Keeps the cached essay index warm so feed requests stay fast. */\nexport default async function (): Promise {\n await refresh();\n console.log(\"pg-essays-rss refreshed\");\n}\n",[160],"4ec4e561-382c-40ec-bc47-0c60403a86fb","main.ts",6,["D",1787641040914],1,"http","import { refresh, lastChecked, fetchEssays, buildRss } from \"./scraper.ts\";\n\n// Re-check the index at most hourly on request; 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Diff · v9