Implement wc CLI with -a options

Author: AhmadHmedann

implement-shell-tools/wc/wc.mjs

@@ -0,0 +1,64 @@
+import { program } from "commander";
+
+import { promises as fs } from "node:fs";
+
+program
+  .name("wc")
+  .description("wc implementation")
+  .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;
+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;
+
+    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);
+
+    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);
+}