feat: add XLSX export functionality and refactor argument parsing in main script

src/index.ts

@@ -1,6 +1,10 @@
 import { readProducts } from "./reader.ts";
 import { connectCache, disconnectCache } from "./cache.ts";
-import { printResults, writeResultsToDb } from "./writer.ts";
+import {
+  printResults,
+  writeResultsToDb,
+  writeResultsWorkbook,
+} from "./writer.ts";
 import { initDb, closeDb } from "./database.ts";
 import {
   chunkArray,
@@ -40,14 +44,18 @@ function parseArgs(): {
   sellability: SellabilityFilter;
 } {
   const args = process.argv.slice(2);
-  const inputFile = args.find((a) => !a.startsWith("--"));
+  const outputFile = readFlagValue(args, "--out", "--output");
-  const outIdx = args.indexOf("--out");
+  const inputFile = readInputFileArg(
-  const outputFile = outIdx !== -1 ? args[outIdx + 1] : undefined;
+    args,
+    "--out",
+    "--output",
+    "--sellability",
+  );
   const sellability = parseSellabilityArg(args);
 
   if (!inputFile) {
     console.error(
-      "Usage: bun run src/index.ts <input.csv|xlsx> [--out results.csv] [--sellability available|all]",
+      "Usage: bun run src/index.ts <input.csv|xlsx> [--out results.xlsx|--output results.xlsx] [--sellability available|all]",
     );
     process.exit(1);
   }
@@ -55,6 +63,44 @@ function parseArgs(): {
   return { inputFile, outputFile, sellability };
 }
 
+function readFlagValue(args: string[], ...flags: string[]): string | undefined {
+  for (const flag of flags) {
+    const equalsArg = args.find((arg) => arg.startsWith(`${flag}=`));
+    if (equalsArg) {
+      const value = equalsArg.slice(flag.length + 1);
+      if (value) return value;
+    }
+
+    const flagIdx = args.indexOf(flag);
+    if (flagIdx !== -1) {
+      return args[flagIdx + 1];
+    }
+  }
+
+  return undefined;
+}
+
+function readInputFileArg(
+  args: string[],
+  ...flagsWithValues: string[]
+): string | undefined {
+  for (let i = 0; i < args.length; i++) {
+    const arg = args[i]!;
+    if (flagsWithValues.includes(arg)) {
+      i++;
+      continue;
+    }
+    if (flagsWithValues.some((flag) => arg.startsWith(`${flag}=`))) {
+      continue;
+    }
+    if (!arg.startsWith("--")) {
+      return arg;
+    }
+  }
+
+  return undefined;
+}
+
 function resolveBaseOutputPath(inputFile: string, outputFile?: string): string {
   if (outputFile) return outputFile;
 
@@ -103,7 +149,8 @@ async function main() {
     }
 
     printResults(allResults);
-    writeResultsToDb(allResults, DB_PATH, inputFile, outputFile);
+    writeResultsWorkbook(allResults, resolvedBaseOutputPath);
+    writeResultsToDb(allResults, DB_PATH, inputFile, resolvedBaseOutputPath);
   } finally {
     await disconnectCache();
     closeDb();

src/writer.ts

@@ -1,5 +1,8 @@
 import { getDb } from "./database.ts";
 import type { AnalysisResult, SupplierAnalysisResult } from "./types.ts";
+import { mkdirSync } from "node:fs";
+import path from "node:path";
+import * as XLSX from "xlsx";
 
 export type RunCounts = {
   totalProducts: number;
@@ -93,6 +96,22 @@ export function writeResultsToDb(
   console.log(`Results written to SQLite database for run_id: ${runId}`);
 }
 
+export function writeResultsWorkbook(
+  results: AnalysisResult[],
+  outputFile: string,
+): void {
+  const outputDir = path.dirname(outputFile);
+  if (outputDir && outputDir !== ".") {
+    mkdirSync(outputDir, { recursive: true });
+  }
+
+  const workbook = XLSX.utils.book_new();
+  const worksheet = XLSX.utils.json_to_sheet(results.map(buildRow));
+  XLSX.utils.book_append_sheet(workbook, worksheet, "Results");
+  XLSX.writeFile(workbook, outputFile);
+  console.log(`Results workbook written: ${outputFile}`);
+}
+
 export function startRunInDb(
   dbPath: string,
   inputFile: string,