nixos-config/nixos/configs/workhorse/finance.nix

{ lib, config, pkgs, ... }:
let

  # find symbols with
  # https://www.alphavantage.co/query?function=SYMBOL_SEARCH&apikey=<api_key>&keywords=<keywords>
  # as described here : https://www.alphavantage.co/documentation/#symbolsearch
  #
  # example:
  # --------
  # stocks = [
  #   {
  #     friendly_name = "google";
  #     symbol = "GOOGL.DEX";
  #     name = "google";
  #     currency = "$";
  #   }
  # ];
  # results in
  # P 2020-01-30 GOOGL $123
  stocks = import ../../private_assets/finance/stocks;
  stocksFile = toString /home/syncthing/finance/hledger/stocks.journal;

in {

  systemd.services.pull_stocks = {
    enable = true;
    description = "pull stocks for hledger";
    serviceConfig = {
      User = "syncthing";
      Type = "oneshot";
    };

    script = let
      command = { symbol, name, currency, ... }: ''
        APIKEY=${lib.fileContents ../../private_assets/finance/alphavantage/apiKey}
        SYMBOL="${symbol}"
        ${pkgs.curl}/bin/curl --location --silent \
          "https://www.alphavantage.co/query?function=GLOBAL_QUOTE&symbol=$SYMBOL&apikey=$APIKEY" \
          | ${pkgs.jq}/bin/jq --raw-output '.["Global Quote"]
          | "P \(.["07. latest trading day"]) ${name} ${currency}\(.["05. price"] | tonumber)"' \
        >> ${stocksFile}
        sleep 1
      '';
    in lib.concatStringsSep "\n" (map command stocks);
  };

  systemd.timers.pull_stocks = {
    enable = true;
    wantedBy = [ "multi-user.target" ];
    timerConfig = {
      OnCalendar = "weekly";
      Persistent = "true";
    };
  };
}