Implement ls command to list files in directory with -1 flag and -a flag

Author: ike-agu

implement-shell-tools/ls/ls.js

@@ -0,0 +1,42 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("list-files-in-directory")
+  .description("Implement ls command to list files in directory")
+  .option("-1, --one-per-line", "list files one per line")
+  .option("-a, --allFiles", "list all files including hidden ones")
+  .argument("[paths...]", "File paths to process");
+
+program.parse(process.argv);
+
+// options and path from commander.
+const opts = program.opts();
+
+let paths = program.args; // array of paths user typed
+if (paths.length === 0) {
+  paths = ["."];
+}
+
+for (const directoryPath of paths) {
+  let entries;
+  try {
+    entries = await fs.readdir(directoryPath);
+  } catch (err) {
+    console.error(`ls: cannot access '${directoryPath}': ${err.message}`);
+    continue; // move to next path if this one fails
+  }
+
+  if (!opts.allFiles) {
+    entries = entries.filter((name) => !name.startsWith("."));
+  }
+
+  if (opts.onePerLine) {
+    entries.forEach((name) => {
+      console.log(name);
+    });
+  } else {
+    //print files in one line if -1 is not used
+    console.log(entries.join(" "));
+  }
+}