Keep a persisted sequence of numbers

incr

#!/usr/bin/env deno run --unstable-kv --allow-read --allow-write
// deno-lint-ignore-file prefer-const
import { parseArgs } from "jsr:@std/cli";

let db = await Deno.openKv("~/.incr/incr.db");

if (import.meta.main) {
  let args = parseArgs(Deno.args, {boolean: ["list"]});
  if (args["list"]) {
    let iter = db.list({ prefix: [] });
    for await (const res of iter) {
      console.log(`${res.key}: ${res.value}`);
    }
    Deno.exit(0);
  }

  let ns = args["_"][0] ?? "_global";

  let old = await db.get([ns]);

  let nextVal = old.value + 1;
  let n = await db.atomic()
    .check(old)
    .set([ns], nextVal)
    .commit();

  if (n.ok === false) {
    console.error("failed to commit result to Deno KV");
    Deno.exit(1);
  }

  console.log(nextVal);
}