finished ls exercise

Author: M-Abdoon

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

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+{}

implement-shell-tools/cat/package.json

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+import { promises as fs } from "node:fs";
+import { program } from "commander";
+
+program
+  .name("list files and directories")
+  .option("-a", "show hidden files")
+  .option("-1", "force displaying each item in a new line")
+  .argument("<paths...>", "path of directory");
+
+program.parse();
+
+const showHiddenFiles = program.opts()["a"];
+const showFilesInLines = program.opts()["1"];
+const fetchedDirectories = await fetchDirectoriesFunc(program.args);
+
+console.log(formatDisplay(fetchedDirectories));
+
+function formatDisplay(fetchedDirectories) {
+  const controlDisplaying = fetchedDirectories.map((directoryFilesInArray) => {
+    const joiner = showFilesInLines ? `\n\r` : `  `;
+    const showFolderName =
+      fetchedDirectories.length > 1
+        ? `${directoryFilesInArray.folderName}:\n\r`
+        : "";
+
+    return `${showFolderName}${directoryFilesInArray.files.join(joiner)}`;
+  });
+  return controlDisplaying.join("\n\r\n\r");
+}
+
+// returns array of objects, like: [{folderName: [file1, file2]}]
+async function fetchDirectoriesFunc(directories) {
+  const result = [];
+
+  for (const folderName of directories) {
+    let files = await fs.readdir(folderName);
+
+    if (showHiddenFiles) files.unshift(".", "..");
+
+    files.sort((a, b) => a.localeCompare(b));
+    result.push({
+      folderName,
+      files,
+    });
+  }
+
+  return result;
+}