Add multiple file support to cat

Author: zohrehKazemianpour

implement-shell-tools/cat/cat.js

@@ -10,45 +10,45 @@ program
   .description("concatenate and print files")
   .option("-n, --number", "Number all output lines")
   .option("-b, --numberNonBlank", "Number non-blank output lines")
-  .argument("<path>", "The file path to process");
+  .argument("<path...>", "The file paths to process");
 
 // here Parse command line arguments (reads process.argv and interprets it)
 program.parse();
 
-// Get the parsed values
-const path = program.args[0]; // The filename user provided
-const hasNumberFlag = program.opts().number; // True if user used -n flag
-const hasBFlag = program.opts().numberNonBlank;
-
-//read the file
-const content = await fs.readFile(path, "utf-8");
-
-// Output with or without line numbers
-if (hasNumberFlag) {
-  
-  // Add line numbers to each line
-  const lines = content.split("\n"); // Split into array of lines
-  const numberedLines = lines.map((line, index) => {
-    const lineNumber = index + 1; // Convert 0-based index to 1-based line number
-    return `${lineNumber} ${line}`; // Format: "     1  Hello"
-  });
-  console.log(numberedLines.join("\n")); // Join back with newlines
-} else if (hasBFlag) {
-  console.log("Using -b flag!");
-  let lineNumber = 0;
-  const lines = content.split("\n");
-  console.log("Total lines:", lines.length);
-  const numberedLines = lines.map((line) => {
-     console.log(`Line: "${line}", isEmpty: ${line.trim() === ""}`);  
-    if (line.trim() === "") {
-      return line;
-    } else {
+// Shared counter across all files for -n and -b flags
+let lineNumber = 0;
+
+
+// Process each file
+for (const path of program.args) {
+  const hasNumberFlag = program.opts().number; // True if user used -n flag
+  const hasBFlag = program.opts().numberNonBlank;
+
+  //read the file for each argument
+  const content = await fs.readFile(path, "utf-8");
+  // Output with or without line numbers
+  if (hasNumberFlag) {
+    // Add line numbers to each line
+    const lines = content.split("\n"); // Split into array of lines
+    const numberedLines = lines.map((line) => {
       lineNumber = lineNumber + 1;
-      return ` ${lineNumber} ${line}`
-    }
-  });
-console.log(numberedLines.join("\n"));
-} else {
-  // Just print the file as-is
-  console.log(content);
+      return `${lineNumber} ${line}`; // Format: "     1  Hello"
+    });
+    console.log(numberedLines.join("\n")); // Join back with newlines
+  } else if (hasBFlag) {
+    const lines = content.split("\n");
+
+    const numberedLines = lines.map((line) => {
+      if (line.trim() === "") {
+        return line;
+      } else {
+        lineNumber = lineNumber + 1;
+        return ` ${lineNumber} ${line}`;
+      }
+    });
+    console.log(numberedLines.join("\n"));
+  } else {
+    // Just print the file as-is
+    console.log(content);
+  }
 }