add per list export_json

oml/user/models.py

@@ -337,6 +337,24 @@ class List(db.Model):
     def create_symlinks(self):
         pass
 
+    def export_json(self, path=None):
+        if not path:
+            if self.name:
+                name = os.path.join('Lists', self.name)
+            else:
+                name = 'Books'
+            path = os.path.join(os.path.expanduser(settings.preferences['libraryPath']), name, 'library.json')
+        from utils import _to_json
+        items = []
+        for i in self.get_items():
+            j = i.json()
+            for f in i.files:
+                j['path'] = f.path
+                break
+            items.append(j)
+        with open(path, 'w') as f:
+            json.dump(items, f, indent=1, default=_to_json, ensure_ascii=False, sort_keys=True)
+
 class Metadata(db.Model):
     __tablename__ = 'user_metadata'
 
@@ -475,6 +493,7 @@ def export_list(data):
             for f in list(existing_files - new_files):
                 os.unlink(f)
             utils.remove_empty_folders(prefix)
+        self.export_json(os.path.join(prefix, 'library.json'))
         trigger_event('activity', {
             'activity': 'export',
             'progress': [count, count],