implement ls command

Author: Fatma Degirmenci

implement-shell-tools/cat/package-lock.json

@@ -0,0 +1,43 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("ls command")
+  .description("create ls command")
+  .option("-1", "One entry per line")
+  .option("-a", "Show all files including hidden")
+  .argument("[paths...]", "File paths");
+
+program.parse();
+
+const opts = program.opts();
+const paths = program.args.length > 0 ? program.args : ["."];
+const onePerLine = opts["1"];
+const showAll = opts.a;
+
+for (const targetPath of paths) {
+  try {
+    let files = await fs.readdir(targetPath);
+
+    if (!showAll) {
+      files = files.filter((f) => !f.startsWith("."));
+    }
+
+    
+    if (paths.length > 1) {
+      console.log(`${targetPath}:`);
+    }
+
+    if (onePerLine) {
+      for (const f of files) console.log(f);
+    } else {
+      console.log(files.join("  "));
+    }
+
+    if (paths.length > 1) {
+      console.log(); 
+    }
+  } catch (err) {
+    console.error(`ls: cannot access '${targetPath}': ${err.message}`);
+  }
+}

implement-shell-tools/cat/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "implement-shell-tools",
+  "version": "1.0.0",
+  "description": "Your task is to re-implement shell tools you have used.",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "commander": "^14.0.2"
+  }
+}