node implementation for wc

Author: SaraTahir28

implement-shell-tools/wc/wc.js

@@ -0,0 +1,61 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+//configuring 
+program
+  .name("wc")
+  .description("Print newline, word, and byte counts for each file")
+  .option("-l, --lines", "Print the newline counts")
+  .option("-w, --words", "Print the word counts")
+  .option("-c, --bytes", "Print the byte counts")
+  .argument("<files...>", "File paths to process")
+//Interpret the program
+  program.parse()
+const options = program.opts()
+const files = program.args //Interpreting parsed data
+
+
+//helper function to calculate all counts 
+async function getCounts(file){
+  const content = await fs.readFile(file, "utf-8");
+  const lineCount = content.split("\n").length -1;//split("\n") returns one more element than the actual number so length-1,
+  const wordCount = content.trim().split(/\s+/).length;
+  const byteCount = Buffer.byteLength(content, "utf-8"); //Calculate how many bytes the string uses in UTF-8 (important because some characters use more than 1 byte)
+  return { lineCount, wordCount, byteCount };
+}
+//initiating totals
+let totalLines = 0;
+let totalWords = 0;
+let totalBytes = 0;
+
+for (const file of files) {
+  const { lineCount, wordCount, byteCount } = await getCounts(file);
+
+  totalLines += lineCount;
+  totalWords += wordCount;
+  totalBytes += byteCount;
+
+let output = "";
+  if (options.lines) output += `${lineCount} `;
+  if (options.words) output += `${wordCount} `;
+  if (options.bytes) output += `${byteCount} `;
+  if (!options.lines && !options.words && !options.bytes) {
+    output += `${lineCount} ${wordCount} ${byteCount} `;
+  }
+  output += file;
+  console.log(output);
+}
+  
+  
+  //Print totals if multiple files
+if (files.length > 1) {
+  let totalOutput = "";
+  if (options.lines) totalOutput += `${totalLines} `;
+  if (options.words) totalOutput += `${totalWords} `;
+  if (options.bytes) totalOutput += `${totalBytes} `;
+  if (!options.lines && !options.words && !options.bytes) {
+    totalOutput += `${totalLines} ${totalWords} ${totalBytes} `;
+  }
+  totalOutput += "total";
+  console.log(totalOutput);
+}