I was reading several post about the powerful template language, so I thought I'd try some of the features. Works well for the basic stuff I was experimenting with to add custom columns
1. Would it be possible to validate a template prior to saving it and restarting Calibre? I made a deliberate mistake ( as opposed to my normal ones) and left off a closing brace to see what would happen. It wasn't until it restarted that the error was caught. If it had been validated when I tried to exit, it would have been handier so I could fix it right away
2. Would it be possible to show a preview of the results of the template on the selected book in the template dialog while building it so the user could get a feel for the results? Might be helpful for the new or occasional template creator.
3. After Calibre restarts, the Virtual Library I had open before restarting, is no longer open, and it defaults to All. If I had a VL open when I closed, could (option maybe) the same VL be selected when I come back?