added function to update latest images

.gitignore

@@ -0,0 +1 @@
+images/*.png

generate.mjs

@@ -1,3 +1,4 @@
+import { time } from 'console';
 import fs from 'fs';
 import client from 'https';
 
@@ -34,7 +35,7 @@ function downloadImage(time_string, filepath) {
             } else {
                 // Consume response data to free up memory
                 res.resume();
-                reject(new Error(`Request Failed With a Status Code: ${res.statusCode}`));
+                reject(new Error(res.statusCode));
 
             }
         });
@@ -49,7 +50,38 @@ export async function initImages(count) {
             await downloadImage(time_string, filename)
         } catch (error) {
             //Response 302, we've reached the latest available image
+            if(error.message === '302') {
+                console.log('Could not download image after ' + time_string);
                 return;
             }
         }
     }
+}
+
+export async function updateImages(count) {
+    let time_strings = [];
+    for(let i = count; i >= 0 ; i--) {
+        time_strings.push(getTimeString(i));
+    }
+    let files = fs.readdirSync('images/');
+    let image_count = files.length;
+
+    //Try to download new images
+    for(let time_string of time_strings) {
+        if (!files.includes(`${time_string}.png`)) {
+            try {
+                await downloadImage(time_string, `images/${time_string}.png`);
+                image_count++;
+            } catch (error) {
+                console.log("No more images available");
+                break;
+            }
+        }
+    }
+
+    //Remove old files
+    for(let file of files.sort().slice(0, image_count-count)) {
+        console.log(`Deleting ${file}`);
+        fs.unlinkSync(`images/${file}`);
+    }
+}

images/.gitignore

@@ -1 +0,0 @@
-*.png

index.mjs

@@ -1,6 +1,11 @@
-import { initImages } from './generate.mjs';
+import { initImages, updateImages } from './generate.mjs';
 
 initImages(10).then(() => {
-    console.log('Downloaded images successfully');
+    console.log('Downloaded initial images successfully');
 });
 
+setInterval(() => {
+    updateImages(10).then(() => {
+        console.log('Updated images successfully');
+    });
+}, 5 * 60 * 1000);