wc-implementation

Author: sarawone

implement-shell-tools/wc/wc.js

@@ -0,0 +1,38 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("wc")
+  .description("Custom wc CLI - count lines, words, bytes")
+  .argument("<file>", "File to process")
+  .option("-l", "Print the number of lines")
+  .option("-w", "Print the number of words")
+  .option("-c", "Print the number of bytes")
+  .parse();
+
+const options = program.opts();
+const filePath = program.args[0];
+
+try {
+  const data = await fs.readFile(filePath,"utf-8");
+  
+
+
+  const lineCount = data.split("\n").length;
+  const wordCount = data.trim().split(/\s+/).length;
+  const byteCount = data.length;
+
+  const showAll = !options.l && !options.w && !options.c;
+
+  
+  const output = [];
+  if (options.l || showAll) output.push(lineCount.toString().padStart(8));
+  if (options.w || showAll) output.push(wordCount.toString().padStart(8));
+  if (options.c || showAll) output.push(byteCount.toString().padStart(8));
+  output.push(filePath);
+
+  console.log(output.join(" "));
+} catch (err) {
+  console.error(`Error reading file "${filePath}":`, err.message);
+  process.exit(1);
+}