implement wc

Author: PratiAmalden

implement-shell-tools/wc/wc.mjs

@@ -0,0 +1,65 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("wc")
+  .description("Display numbers of line, words, and bytes in each file")
+  .option("-l", "Number of lines")
+  .option("-w", "Number of words")
+  .option("-c", "Number of bytes")
+  .argument("<path...>");
+
+program.parse();
+
+const options = program.opts();
+const paths = program.args;
+
+let totalLines = 0;
+let totalWords = 0;
+let totalBytes = 0;
+
+for(const path of paths){
+    let content;
+    try{
+        content = await fs.readFile(path, "utf-8");
+    } catch (err){
+        console.error(`Error reading file "${path}":`, err.message);
+        continue;
+    }
+
+    const lines = content.replace(/\n$/, "").split("\n");
+    
+    const words = content.trim().split(/\s+/); // handles multiple spaces
+    const { size } = await fs.stat(path);
+
+    const lineCount = lines.length;
+    const wordCount = words.length;
+    const byteCount = size;
+
+    totalLines += lineCount;
+    totalWords += wordCount;
+    totalBytes += byteCount;
+
+    if(options.l) {
+        console.log(`\t${lineCount} ${path}`);
+    } else if(options.w) {
+        console.log(`\t${wordCount} ${path}`);
+    } else if(options.c) {
+        console.log(`\t${byteCount} ${path}`)
+    } else {
+        console.log(`\t${lineCount}\t${wordCount}\t${size} ${path}`);
+    }
+
+}
+
+if (paths.length > 1) {
+  if (options.l) {
+    console.log(`\t${totalLines} total`);
+  } else if (options.w) {
+    console.log(`\t${totalWords} total`);
+  } else if (options.c) {
+    console.log(`\t${totalBytes} total`);
+  } else {
+    console.log(`\t${totalLines}\t${totalWords}\t${totalBytes} total`);
+  }
+}