Fix generation of output

boop.py

@@ -52,7 +52,6 @@ def list_photos_in(gallery_dir):
 
 def generate_output_dir():
     output_path = os.path.join(os.curdir, OUTPUT_DIR_NAME)
-    shutil.rmtree(output_path)
     if not os.path.isdir(output_path):
         os.mkdir(output_path)
     return output_path
@@ -61,6 +60,8 @@ def generate_output_dir():
 def generate_style(output_path):
     style_path = os.path.join(os.curdir, THEME, "style")
     style_output_path = os.path.join(output_path, "style")
+    if os.path.isdir(style_output_path):
+        shutil.rmtree(style_output_path)
     shutil.copytree(style_path, style_output_path)
 
 
@@ -101,7 +102,7 @@ def generate_gallery_index(output_path, gallery):
 
 def generate_gallery_dir(output_path, gallery):
     gallery_output_path = os.path.join(output_path, gallery["name"])
-    if os.path.isdir(gallery_output_path):
+    if not os.path.isdir(gallery_output_path):
         os.mkdir(gallery_output_path)
 
     for photo in gallery["photos"]: