[Feature]: Merge positive and negative prompts into single prompt

Feature description

Currently it is impossible to have dynamic negative prompt based on positive prompt

My proposal is to use negative weights to describe stuff for negative prompt - system would then just extract those for negative prompt:

prompt: foo, (bar:-1)

would be equivalent to current: positive: foo negative: bar (or (bar:1) for simplicity)

Reasoning: wildcards

wildcard example: lets say i have wildcard file color.txt

red
green
blue

then currently im unable to specify 'if red is selected add purple to negative prompt'

if prompts got merged i could write my wildcard file like this:

red, (purple:-1)
green
blue

and system would recognized that purple belongs to negative prompt

result would be even more powerful wildcards ...

PS: it would be nice to show final prompt in log not just list of possible wildcards, but that just cosmetic ....

Version Platform Description

windows 11, latest version of sdnext