feat(wc): implement wc command for word, line, and byte counting

Author: jakr-s

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

@@ -0,0 +1,6 @@
+{
+  "type": "module",
+  "dependencies": {
+    "commander": "^14.0.3"
+  }
+}

implement-shell-tools/wc/package.json

@@ -0,0 +1,39 @@
+import { program } from "commander";
+import * as fs from "node:fs/promises";
+
+//*** TODO ***
+// * Format results
+// * Add optional flags
+
+program
+  .name("wc")
+  .description("word, line and byte count")
+  .argument("<paths...>", "The file path(s) to process");
+
+program.parse();
+
+try {
+  const filePaths = program.args;
+  const results = {};
+
+  for (const filePath of filePaths) {
+    const file = await fs.open(filePath);
+    const stats = await fs.stat(filePath);
+
+    const count = { lines: 0, words: 0, bytes: stats.size };
+
+    try {
+      for await (const line of file.readLines()) {
+        count.lines++;
+        count.words += line.trim().split(/\s+/).length;
+      }
+    } finally {
+      await file.close();
+    }
+
+    results[filePath] = count;
+  }
+  console.log(results);
+} catch (err) {
+  console.error(err.message);
+}