Merge pull request #6 from taichihub/02-my-calendar

20240906 カレンダーのプログラム(JavaScript)

Author: taichihub

02.calendar/cal.js

@@ -0,0 +1,54 @@
+#!/usr/bin/env node
+
+import { Command } from "commander";
+import { DateTime } from "luxon";
+
+function printCalendar(year, month) {
+  if (year < 1900 || year > 2100 || month < 1 || month > 12) {
+    console.error(
+      "指定された年または月が無効です。(年:1900〜2100,月:1〜12が有効)",
+    );
+    process.exit(1);
+  }
+
+  console.log(`      ${month}月 ${year}`);
+  console.log("日 月 火 水 木 金 土");
+
+  const firstDay = DateTime.local(year, month, 1);
+  const lastDay = firstDay.endOf("month");
+
+  const padding = " ".repeat((firstDay.weekday % 7) * 3);
+  process.stdout.write(padding);
+
+  for (let day = firstDay; day <= lastDay; day = day.plus({ days: 1 })) {
+    const formattedDay = day.day.toString().padStart(2);
+    const isLastDay = day.hasSame(lastDay, "day");
+    const isSaturday = day.weekday === 6;
+    if (isLastDay) {
+      console.log(formattedDay);
+      console.log();
+    } else if (isSaturday) {
+      console.log(formattedDay);
+    } else {
+      process.stdout.write(`${formattedDay} `);
+    }
+  }
+}
+
+function main() {
+  const program = new Command();
+
+  program
+    .option("-y, --year <year>", "年を指定", parseInt)
+    .option("-m, --month <month>", "月を指定", parseInt)
+    .parse(process.argv);
+
+  const options = program.opts();
+  const now = DateTime.now();
+  const year = options.year ?? now.year;
+  const month = options.month ?? now.month;
+
+  printCalendar(year, month);
+}
+
+main();

02.calendar/package-lock.json

@@ -3,6 +3,10 @@
     "fix": "prettier --write . && eslint --fix .",
     "lint": "prettier --check . && eslint ."
   },
+  "dependencies": {
+    "commander": "^12.1.0",
+    "luxon": "^3.5.0"
+  },
   "devDependencies": {
     "@eslint/js": "^9.9.0",
     "eslint": "^9.9.0",