feat: add command (WIP)

src/command.ts

@@ -0,0 +1,35 @@
+#!/usr/bin/env node
+
+import fs from 'fs';
+import { parseArgs } from 'node:util';
+import { convertLog, MODE } from './lib/convertLog.js';
+
+const options = {
+  mode: {
+    type: 'string',
+    short: 'm',
+    multiple: false,
+    default: MODE.Log,
+  },
+} as const;
+
+const main = async () => {
+  const args = process.argv.slice(2);
+  const parsedArgs = parseArgs({ options, args });
+  const mode = parsedArgs.values.mode!;
+
+  const input = fs.readFileSync(process.stdin.fd, 'utf-8');
+  const parsedInput = JSON.parse(input);
+
+  const outputJson = convertLog(parsedInput, mode);
+
+  const output = Array.isArray(outputJson)
+    ? outputJson.join('\n') + '\n'
+    : JSON.stringify(outputJson) + '\n';
+  fs.writeSync(process.stdout.fd, output);
+};
+
+main().catch((error) => {
+  process.exitCode = 1;
+  console.error(error);
+});