feat: implement custom ls with -1 and -a support

Author: JanefrancessC

implement-shell-tools/cat/customCat.js

@@ -15,8 +15,6 @@ program.parse();
 const argv = program.args;
 const options = program.opts();
 
-let lineNumber = 1;
-
 for (const filePath of argv) {
   try {
     const content = await fs.readFile(filePath, "utf-8");
@@ -27,8 +25,9 @@ for (const filePath of argv) {
     lines.forEach((line, index) => {
       if (options.nonBlank) {
         if (line.trim() !== "") {
-          process.stdout.write(`${(index + 1).toString().padStart(6)} ${line}\n`);
-          lineNumber++;
+          process.stdout.write(
+            `${(index + 1).toString().padStart(6)} ${line}\n`,
+          );
         } else process.stdout.write(`${line}\n`);
       } else if (options.number) {
         process.stdout.write(`${(index + 1).toString().padStart(6)} ${line}\n`);

implement-shell-tools/ls/customLs.js

@@ -0,0 +1,53 @@
+#!/usr/bin/env node
+
+import process from "node:process";
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("customLs")
+  .description("List contents of a directory")
+  .option("-1", "Force output to be one entry per line")
+  .option("-a", "Include hidden files")
+  .argument("[path...]", "directories to list");
+
+program.parse();
+
+const options = program.opts();
+const targetPaths = program.args.length > 0 ? program.args : ["."];
+
+async function listDir(dirPath, showHeader) {
+  try {
+    let contents = await fs.readdir(dirPath);
+
+    if (options.a) {
+      contents.push(".", "..");
+    } else {
+      contents = contents.filter((name) => !name.startsWith("."));
+    }
+
+    contents.sort();
+
+    if (showHeader) {
+      process.stdout.write(`${dirPath}:\n`);
+    }
+
+    if (options["1"]) {
+      contents.forEach((item) => process.stdout.write(`${item}\n`));
+    } else {
+      process.stdout.write(`${contents.join("   ")}\n`);
+    }
+  } catch (error) {
+    console.error(`customLs: ${dirPath}: ${error.message}`);
+    process.exit(1);
+  }
+}
+
+for (let i = 0; i < targetPaths.length; i++) {
+  const path = targetPaths[i];
+  const isMultiplePath = targetPaths.length > 1;
+
+  await listDir(path, isMultiplePath);
+
+  if (isMultiplePath && i < targetPaths.length - 1) process.stdout.write(`\n`);
+}

implement-shell-tools/package-lock.json

@@ -1,3 +1,6 @@
 {
-  "type": "module"
+  "type": "module",
+  "dependencies": {
+    "commander": "^14.0.3"
+  }
 }