日記ページを作る

script.js

// Cosense userscript: /api/code/nishio/MyUserScript/script.js などに追記
const project = "nishio";
const titlePrefix = "日記";

function ymd(d = new Date()) {
  const y = d.getFullYear();
  const m = String(d.getMonth() + 1).padStart(2, "0");
  const day = String(d.getDate()).padStart(2, "0");
  return `${y}-${m}-${day}`;
}

function toTitle(d) {
  return `${titlePrefix}${ymd(d)}`; // "日記yyyy-MM-dd"
}

// JSTはDSTなしなので日単位加減算はこれでOK
function addDays(date, n) {
  const d = new Date(date.getFullYear(), date.getMonth(), date.getDate());
  d.setDate(d.getDate() + n);
  return d;
}
function subDays(date, n) {
  return addDays(date, -n);
}

// date-fns subYears 的に 2/29 を 2/28 に丸める
function subYearsSafe(date, n) {
  const d = new Date(date.getFullYear(), date.getMonth(), date.getDate());
  const origMonth = d.getMonth();
  d.setFullYear(d.getFullYear() - n);
  if (d.getMonth() !== origMonth) d.setDate(0); // 前月末に丸め
  return d;
}

function footerLines(today) {
  const yesterday = toTitle(subDays(today, 1));
  const t = toTitle(today);
  const tomorrow = toTitle(addDays(today, 1));
  const d100 = toTitle(subDays(today, 100));
  const y1 = toTitle(subYearsSafe(today, 1));

  // pin-diary-X と同じ表記: [昨日]←今日→[明日] / 100日前 [..] / 1年前 [..]
  return [
    `[${yesterday}]←${t}→[${tomorrow}]`,
    `100日前 [${d100}]`,
    `1年前 [${y1}]`,
  ];
}

scrapbox.PageMenu.addItem({
  title: "日記作成",
  onClick: () => {
    const today = new Date();
    const title = toTitle(today);

    // 本文は空で、末尾にテンプレフッターだけ入れる（上に自由に書ける）
    const body = encodeURIComponent(["", "", ...footerLines(today)].join("\n"));

    window.open(
      `https://scrapbox.io/${project}/${encodeURIComponent(title)}?body=${body}`,
      "_blank",
    );
  },
});