[question] is there an option to keep just the empty lines at the end of file

[alexzanderr]

i have a file.
i want it to be trimmed.
but i want to keep the exceeding empty lines that are at the end of the file.
is there an option for that?

[alexzanderr]

for example, keep all of these lines from 58 to 72, but trim everything else

[cappyzawa]

Why don't you use :noa w ?

[alexzanderr]

it doesnt trim the extra white space on the lines

i've come up with solution:

    patterns = {
        -- this just trims the whitespace on the lines
        -- its enough
        [[%s/\s\+$//e]],
        -- [[%s/\($\n\s*\)\+\%$//]],
        -- [[%s/\%^\n\+11//]],
        -- [[%s/\(\n\n\)\n\+/\0/]],
    },

and its working perfectly