Implement ls command to list directory contents

Author: Droid-An

implement-shell-tools/ls/ls.js

@@ -0,0 +1,86 @@
+import { promises as fs } from "node:fs";
+import process from "node:process";
+import path from "node:path";
+import { program } from "commander";
+
+program
+  .name("ls")
+  .description("Shows files in directory")
+  .option("-1", "list one file per line")
+  .option(
+    "-a",
+    "Used to list all files, including hidden files, in the current directory"
+  )
+  .argument("[sample-files]", "The file path to process");
+
+program.parse();
+
+let pathToFile = "";
+
+const programArgv = program.args;
+
+(async () => {
+  if (programArgv.length === 1) {
+    pathToFile = programArgv[0];
+    try {
+      const stats = await fs.stat(pathToFile);
+      if (stats.isFile()) {
+        await listFiles("file");
+      } else if (stats.isDirectory()) {
+        listFiles("directory");
+      } else {
+        console.error("Not a file or directory.");
+      }
+    } catch (err) {
+      console.error("Invalid path:", err.message);
+    }
+  } else if (programArgv.length === 0) {
+    pathToFile = process.cwd();
+    await listFiles("directory");
+  } else {
+    console.error(
+      `Expected no more than 1 argument (sample-files) but got ${programArgv.length}.`
+    );
+  }
+})();
+
+const flag_1 = (files) => {
+  files.forEach(function (file) {
+    console.log(file);
+  });
+};
+
+const flag_a = (files) => {
+  files.unshift("..");
+  files.unshift(".");
+  return files;
+};
+
+async function listFiles(type) {
+  let output = [];
+  let formattedPath = "";
+  if (type == "directory") {
+    formattedPath = pathToFile;
+  } else if (type == "file") {
+    formattedPath = path.dirname(pathToFile);
+  }
+  const char = program.opts();
+  const files = await fs.readdir(formattedPath);
+  const sortedOutput = files.sort((a, b) => a.localeCompare(b));
+
+  if (char["a"]) {
+    output = flag_a(sortedOutput);
+  } else {
+    sortedOutput.forEach(function (file) {
+      if (file[0] != ".") {
+        output.push(file);
+      }
+    });
+  }
+
+  if (char["1"]) {
+    flag_1(output);
+  } else {
+    console.log(output.join("   "));
+  }
+}