feat: add -l, -w, and -c flags support to wc implementation

Author: AhmadHmedann

implement-shell-tools/wc/wc.mjs

@@ -1,37 +1,68 @@
 import { program } from "commander";
-import { error } from "node:console";
-import { promises as fs, link } from "node:fs";
+
+import { promises as fs } from "node:fs";
 
 program
   .name("wc")
   .description("wc implementation")
-  .argument("<paths...>", "the file path to process");
+  .argument("<paths...>", "the file path to process")
+  .option("-l", "count  lines")
+  .option("-w", "count  words")
+  .option("-c", "count characters");
 program.parse();
 
 const paths = program.args;
+
+if (paths.length === 0) {
+  console.error("Expected at least one argument (a path)");
+  process.exit(1);
+}
+const options = program.opts();
+
 const total = {
   linesCounter: 0,
   wordsCounter: 0,
   characterCounter: 0,
 };
-try{
-for (const path of paths) {
-  const content = await fs.readFile(path, "utf-8");
 
-  const linesCounter = content.split("\n").length - 1;
-  const wordsCounter = content.trim().split(/\s+/).length;
-  const characterCounter = content.length;
+try {
+  for (const path of paths) {
+    const content = await fs.readFile(path, "utf-8");
+
+    const linesCounter = content.split("\n").length - 1;
+    const wordsCounter = content.trim().split(/\s+/).length;
+    const characterCounter = content.length;
+
+    total.linesCounter += linesCounter;
+    total.wordsCounter += wordsCounter;
+    total.characterCounter += characterCounter;
 
-  total.linesCounter += linesCounter;
-  total.wordsCounter += wordsCounter;
-  total.characterCounter += characterCounter;
+    let results = [];
+    if (options.l) results.push(linesCounter);
+    if (options.w) results.push(wordsCounter);
+    if (options.c) results.push(characterCounter);
 
-  console.log(` ${linesCounter}  ${wordsCounter} ${characterCounter} ${path}`);
+    if (!options.l && !options.w && !options.c)
+      console.log(
+        ` ${linesCounter}  ${wordsCounter} ${characterCounter} ${path}`,
+      );
+    else {
+      console.log(results.join(" ") + " " + path);
+    }
+  }
+  if (paths.length > 1) {
+    if (!options.l && !options.w && !options.c) {
+      console.log(
+        ` ${total.linesCounter}  ${total.wordsCounter} ${total.characterCounter} total`,
+      );
+    } else {
+      const totalWithFlags = [];
+      if (options.l) totalWithFlags.push(total.linesCounter);
+      if (options.w) totalWithFlags.push(total.wordsCounter);
+      if (options.c) totalWithFlags.push(total.characterCounter);
+      console.log(totalWithFlags.join(" ") + " total");
+    }
+  }
+} catch (error) {
+  console.error(error.message);
 }
-if (paths.length > 1)
-  console.log(
-    ` ${total.linesCounter}  ${total.wordsCounter} ${total.characterCounter} total`,
-  );
-}catch(error){
-    console.log(error.message);
-}