Finilise the cat.js programm that works for the commands.

Author: Fithi-Teklom

implement-shell-tools/cat/cat.js

@@ -3,33 +3,41 @@ const fs = require("fs");
 const args = process.argv.slice(2);
 
 let mode = "normal";
+let files = [];
 
-if (args[0] === "-b") {
+if (args[0] === "-n") {
+  mode = "number";
+  files = args.slice(1);
+} else if (args[0] === "-b") {
   mode = "numberNonEmpty";
+  files = args.slice(1);
+} else {
+  files = args;
 }
 
-const files = args.slice(1);
-
 let lineNum = 1;
 
 for (const file of files) {
-
   const content = fs.readFileSync(file, "utf8");
 
-  const lines = content.trimEnd().split("\n");
+  const lines = content.replace(/\n$/, "").split("\n");
 
-  for (const line of lines) {
-
-    if (mode === "numberNonEmpty") {
+  if (mode === "normal") {
+    console.log(content);
+    continue;
+  }
 
-      if (line !== "") {
-        console.log(lineNum + " " + line);
-        lineNum++;
+  for (const line of lines) {
+    if (mode === "number") {
+      console.log(`${String(lineNum).padStart(6)}  ${line}`);
+      lineNum++;
+    } else if (mode === "numberNonEmpty") {
+      if (line === "") {
+        console.log("");
       } else {
-        console.log(line);
+        console.log(`${String(lineNum).padStart(6)}  ${line}`);
+        lineNum++;
       }
-
     }
-
   }
 }