Add initial implementation of wc command line tool with no options

Author: i786m

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

@@ -0,0 +1,16 @@
+{
+  "name": "wc",
+  "version": "1.0.0",
+  "description": "You should already be familiar with the `wc` command line tool.",
+  "main": "wc.mjs",
+  "type": "module",
+  "dependencies": {
+    "commander": "^14.0.3"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}

implement-shell-tools/wc/package.json

@@ -0,0 +1,25 @@
+import { program } from 'commander';
+import process from 'node:process';
+import { promises as fs } from 'node:fs';
+
+program
+    .name('wc')
+    .description('Counts the number of lines, words, and characters in a file.')
+    .argument('<path>', 'The path to the file to analyze')
+
+program.parse();
+
+const argv = program.args;
+
+if (argv.length != 1) {
+    console.error(
+        `Expected exactly 1 argument (a path) to be passed but got ${argv.length}.`);
+    process.exit(1);
+}
+const path = argv[0];
+
+const content = await fs.readFile(path, 'utf-8');
+const lineCount = content.split('\n').filter(Boolean).length;
+const wordCount = content.split(' ').filter(Boolean).length;
+const characterCount = content.length;
+console.log(` ${lineCount}  ${wordCount} ${characterCount} ${path}`);