[chaley]

Originally Posted by un_pogaz

Else, I worked of the idea and so here my proposal:
[/SPOILER]

FWIW: I'm currently implementing these changes to the base formatter.

• ids = selected_books()
• name = selected_cell(). Returns the lookup name.
• A 'with' statement that changes the book the template is using for the statement's block. The same local variables are available to the inner and outer block.

Example:

program: 
	ids = selected_books();
	col = selected_column();
	res = '';
	for id in ids:
		with id:
			# prints information from the book with identifier 'id'
			print($title, field(col));
			res = (if res then res & ',' fi) & field(col);
			template('program: print("inside template", $title)')
		htiw
	rof;
	list_remove_duplicates(res, ',')

Internal template functions and stored templates called from inside the 'with' block use the book with id 'id'.

EDIT: I'm also going to implement "show_in_dialog()" that renders an html string.