opti: regen only updated folder

src/main.py

@@ -3,6 +3,7 @@ import os
 from progress.bar import Bar
 from jinja2 import Environment, FileSystemLoader
 import subprocess
+import time
 
 def argument_parsing():
     if (len(sys.argv) < 2):
@@ -33,12 +34,30 @@ def get_images(files):
             images_datas.append((image, export_data_file))
         images_datas.append((image,))
     return images_datas
+
+def get_updated_folders(path: str):
+    updated_folders: list[str] = []
+    for element_name in os.listdir(path):
+        absolut_path: str = os.path.join(path, element_name)
+        if not os.path.isdir(absolut_path):
+            continue
+        (mode, ino, dev, nlink, uid, gid, size, atime, mtime, ctime) = os.stat(absolut_path)
+        folder_modified_date = time.ctime(mtime)
+        html_path: str = os.path.join(absolut_path, f"{element_name}.html")
+        if not os.path.exists(html_path):
+            updated_folders.append(absolut_path)
+            continue
+        (mode, ino, dev, nlink, uid, gid, size, atime, mtime, ctime) = os.stat(absolut_path)
+        html_modified_date = time.ctime(mtime)
+        if (html_modified_date < folder_modified_date):
+            updated_folders.append(absolut_path)
+            continue
     
+    return updated_folders
 
 def main():
     site_path: str = argument_parsing()
-    folders: list[str] = [os.path.join(site_path, f) for f in os.listdir(site_path)]
-    folders = [file for file in folders if os.path.isdir(file)]
+    folders = get_updated_folders(site_path)
     with Bar("generating...", max=len(folders)) as bar:
         for folder in folders:
             files: list[str] = [os.path.join(folder, file) for file in os.listdir(folder)]