feat: implement custom 'ls' command with support for hidden files (-a)

Author: RahwaZeslusHaile

implement-shell-tools/ls/sample-files/myLs.js

@@ -0,0 +1,50 @@
+#!/usr/bin/env node
+const { program } = require("commander");
+const fs = require("fs");
+const path = require("path");
+
+function listDirectory(dir, options) {
+  try {
+    const stats = fs.statSync(dir);
+
+    if (stats.isFile()) {
+      console.log(dir);
+      return; 
+    }
+  } catch (e) {
+    console.error(`ls: cannot access '${dir}': No such file or directory`);
+    return;
+  }
+
+  let entries;
+
+  try {
+    entries = fs.readdirSync(dir, { withFileTypes: true });
+  } catch (e) {
+    console.error(`ls: cannot access '${dir}': No such file or directory`);
+    return;
+  }
+
+  let names = entries.map(e => e.name);
+
+  if (options.all) {
+    names.unshift(".", "..");
+  } else {
+    names = names.filter(name => !name.startsWith("."));
+  }
+
+  names.sort();
+  names.forEach(name => console.log(name));
+}
+
+program
+  .name("myls")
+  .description("Custom implementation of ls")
+  .option("-1", "list one file per line (default in our version)")
+  .option("-a, --all", "include hidden files")
+  .argument("[dir]", "directory to list", ".")
+  .action((dir, options) => {
+    listDirectory(dir, options);
+  });
+
+program.parse();