feat: create a script that behave like wc command.

Author: jamallaqdiem

implement-shell-tools/wc/wc.js

@@ -0,0 +1,40 @@
+import process, { exit } from "node:process";
+import fs from "node:fs";
+
+const argv = process.argv.slice(2);
+
+const showWords = argv.includes("-w");
+const showLines = argv.includes("-l");
+const showBytes = argv.includes("-c");
+const showCharacters = argv.includes("-m");
+
+//  filter flags, and getting the string of filename
+const filePaths = argv.filter((arg) => !arg.startsWith("-"));
+
+const noFlags = !showLines && !showCharacters && !showWords && !showCharacters;
+if (!filePaths) {
+  console.error("PLease provide a file path");
+  process.exit(1);
+}
+// loop trough the array to get each file path.
+filePaths.forEach((filePath) => {
+  const content = fs.readFileSync(filePath, "utf-8");
+
+  const lines = content.split("\n").length - 1;
+  const words = content
+    .trim()
+    .split(/\s+/)
+    .filter((word) => word != "").length;
+  // here I used Buffer.byteLength even if characters and bytes can be the same number .length, however sometimes an emoji or special characters can be heavier 2b or 4b
+  const bytes = Buffer.byteLength(content);
+  const characters = content.length;
+
+  let output = "";
+
+  if (showLines || noFlags) output += `${lines} `;
+  if (showWords || noFlags) output += `${words} `;
+  if (showBytes || noFlags) output += `${bytes} `;
+  if (showCharacters || noFlags) output += `${characters} `;
+
+  console.log(`${output} ${filePath}`);
+});