implementing flag -n

Author: sheida-shab

implement-shell-tools/cat/cat.js

@@ -1,14 +1,42 @@
 import { promises as fs } from "node:fs";
 import { glob } from "glob";
  async function readFile(){
-    const fileNamePattern=process.argv[2];
-    const filesNameArray=await glob(fileNamePattern);
-    filesNameArray.sort();
+    let fileNamePattern;
+    let flag;
+    if (process.argv[2].startsWith('-')){
+        flag=process.argv[2];
+        fileNamePattern = process.argv[3];
+     } else {
+         fileNamePattern = process.argv[2];
+       }
+    
+       const filesNameArray = await glob(fileNamePattern);
+       filesNameArray.sort();
+       let lineNumber = 1;
+       //console.log(filesNameArray);
+       
+   
     for(const file of filesNameArray){
         const fileContent=await fs.readFile(file,"utf-8");
-        console.log(fileContent);
-    }
+        if(flag == null){
+            console.log(fileContent);
+        }else{
+            
+            const linesOfText=fileContent.split(/\r?\n/);
+            if(linesOfText[linesOfText.length-1].trim()===""){
+                linesOfText.pop();
+            }
+            //console.log(linesOfText);
+            for(const line of linesOfText){
+                console.log(`${lineNumber} ${line}`);
+                lineNumber ++ ;
+            }
+            }
 
+        
+        
+    }
+    }
 
- }
+ 
  readFile();