Since I'd like to keep RedNotebook's interface and code simple your idea might be a little too specialized. However, I'm thinking about implementing a plugin system for RedNotebook for which this addition seems a perfect fit. Might be a while before I get to implementing this though as time is rare these days. One part of the plugin system could be a macro system that takes predefined text like {weather:california} and turns it into other text for the preview, e.g. an HTML snippet that displays the symbol for the weather in California on that day.
Since I'd like to keep RedNotebook's interface and code simple your idea might be a little too specialized. However, I'm thinking about implementing a plugin system for RedNotebook for which this addition seems a perfect fit. Might be a while before I get to implementing this though as time is rare these days. One part of the plugin system could be a macro system that takes predefined text like {weather: california} and turns it into other text for the preview, e.g. an HTML snippet that displays the symbol for the weather in California on that day.