Bullet list and "showbreak"

Hello,

I use "showbreak" in my text, I'd like to know if somebody could help me with a "showbreak conditional", please:

if "text begins with [_]"
set showbreak=\ \ \ \
else if "text begins with -"
set showbreak=\ \
else
endif

In fact, I want a "showbreak" According to the beginning of the paragraph. Does someone have ideas, please?

thX

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