Pull request Alejandra

app.js

@@ -0,0 +1,109 @@
+#!/usr/bin/env node
+const fs= require ("fs");
+const path = require("path");
+const fetch= require("node-fetch");
+let options= process.argv;
+
+let index = process.argv.indexOf("--file");    
+let pathFileArg = process.argv[index +1];
+
+
+ function validateExt(pathFile) {
+    try {
+        let ext= (path.extname(pathFile));            
+        return  ext === '.md' 
+    } catch (e) {
+        return false
+    }    
+ }
+
+
+function readMdFile(pathFile) {          
+    const data = fs.readFileSync(pathFile, 'utf-8')
+    return data; 
+}  
+
+
+function getLinks(data) {
+    let string= data;  
+    let regExp= (/https?:\S+\w/gi);
+    let links= string.match(regExp);
+    return links    
+}       
+
+let linkok =[]
+let okLinks = [] 
+let blink=[]
+let broken = [] 
+
+function statusLink(links) {    
+    let i=0        
+    let j=0  
+    let promises =links.map( link =>fetch(link)
+        .then(res=> { 
+            linkok= {
+                href:res.url,
+                statusText:res.statusText,
+                status:res.status,                           
+                file:pathFileArg          
+            }
+
+            if (linkok.status===200){
+                okLinks.push(linkok)
+                return i++
+            }
+            if (linkok.status!==200){
+                broken.push(linkok)
+                return   j++
+            } 
+        })
+        .catch(err=>{          
+            blink={          
+                url:link,
+                error:err.code,
+                status:err.status,
+                file:pathFileArg 
+            }
+            if (blink.status!==200){
+                broken.push(blink)
+                return j++
+            }
+        }))
+
+        return Promise.all(promises) 
+        .then(results => ({
+              Total: results.length,
+              Ok: i,
+              Broken: j,            
+        })
+        ) 
+}
+
+
+function main (pathFile) {
+    if (validateExt(pathFile)) {
+        const data = readMdFile(pathFile);
+        const links= getLinks(data);
+        console.log("Links encontrados:",links)
+        return statusLink(links)       
+    } else {
+        return Promise.reject('El archivo no está en formato md'); 
+    } 
+}
+
+main(pathFileArg)
+.then((result) => {    
+    if (options.includes('--validate') && options.includes('--stats')) {
+        console.log(result)
+        console.log("OK Links:",okLinks)
+        console.log("Broken Links:",broken)
+    }else if(options.includes('--validate')){       
+        console.log("OK Links:",okLinks)
+        console.log("Broken Links:",broken)
+    } else if(options.includes ('--stats')){
+        console.log(result)
+    }       
+})
+.catch(e=> {
+    console.log(e)
+  });;