Implement wc command

Author: RihannaP

implement-shell-tools/wc/wc.js

@@ -0,0 +1,57 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+import process from "node:process";
+
+program
+    .name("wc command")
+    .description("Implementing 'wc' command")
+    .option("-l", "show line count")
+    .option("-w", "show word count")
+    .option("-c", "show character count")
+    .argument("<paths...>", "files to read");
+
+program.parse();
+
+const paths = program.args;
+const options = program.opts();
+
+
+function formatCounts(lines, words, chars, options) {
+  let result = "";
+
+  if (options.l || options.w || options.c) {
+    if (options.l) result += `${lines}L  `;
+    if (options.w) result += `${words}W  `;
+    if (options.c) result += `${chars}Char  `;
+  } else {
+    result += `${lines}L ${words}W ${chars}Char `;
+  }
+
+  return result;
+}
+
+let totalLines = 0;
+let totalWords = 0;
+let totalChars = 0;
+
+for (const path of paths) {
+  const content = await fs.readFile(path, "utf-8");
+
+  const lineCount = (content.match(/\n/g) || []).length;
+  const wordCount = content.trim().split(/\s+/).length;
+  const charCount = content.length;
+
+  totalLines += lineCount;
+  totalWords += wordCount;
+  totalChars += charCount;
+
+  const output = formatCounts(lineCount, wordCount, charCount, options);
+
+  console.log(`${output}${path}`);
+}
+
+if (paths.length > 1) {
+  const totalOutput = formatCounts(totalLines, totalWords, totalChars, options);
+
+  console.log(`${totalOutput}total`);
+}