implement ls with -1 and -a flags

Author: Konvaly

implement-shell-tools/ls/ls.js

@@ -0,0 +1,30 @@
+import { promises as fs } from "node:fs";
+import process from "node:process";
+
+const args = process.argv.slice(2);
+
+const showHidden = args.includes("-a");
+
+const paths = args.filter((arg) => !arg.startsWith("-"));
+
+const targetPath = paths.length > 0 ? paths[0] : process.cwd();
+
+let entries = await fs.readdir(targetPath);
+
+if (!showHidden) {
+  entries = entries.filter((entry) => !entry.startsWith("."));
+}
+
+if (showHidden) {
+  entries = [".", "..", ...entries];
+}
+
+entries.sort((a, b) => {
+  const cleanA = a.replace(/^\.+/, "");
+  const cleanB = b.replace(/^\.+/, "");
+  return cleanA.localeCompare(cleanB);
+});
+
+for (const entry of entries) {
+  process.stdout.write(entry + "\n");
+}