untick all entries

shop.py

@@ -249,8 +249,6 @@ def restore_md():
     flash('Backup restored')
     return redirect(url_for('show_shop',shopid=shopid))
 
-
-
 @app.route('/toggle', methods=['POST'])
 def toggle_item():
     if not session.get('logged_in'):
@@ -266,23 +264,30 @@ def toggle_item():
         if key=='toggleAll':
             # Special meaning: toggle all rows
             req_row=-1
+        if key=='unTickAll':
+            # Special meaning: untick all rows
+            req_row=-2
     if req_row==None:
         return redirect(url_for('show_shop',shopid=shopid))
     data_dir=os.path.join(DATADIR, ownername)
     data_file=os.path.join(data_dir, shopname+".md")
+    backup=data_file+".bkp"
     contents_file=open(data_file,'rt')
     contents=contents_file.read().decode('utf-8').split("\n")
     contents_file.close()
     changed=False
     for i,row in enumerate(contents):
-        if i==req_row or req_row==-1:
-            if '[ ]' in row:
-                contents[i]=row.replace('[ ]','[x]')
+        if i==req_row or req_row<0:
+            if req_row!=-2: # no ticking if unticking all
+                if '[ ]' in row:
+                    contents[i]=row.replace('[ ]','[x]')
             if '[x]' in row:
                 contents[i]=row.replace('[x]','[ ]')
-            if row!=contents[i]:
-                changed=True
+        if row!=contents[i]:
+            changed=True
     if changed:
+        if req_row==-1 or req_row==-2:
+            copyfile(data_file, backup)
         contents_file=open(data_file,'wt')
         contents_file.write("\n".join(contents).encode('utf-8'))
         contents_file.close()