capture_and_indent.jl

function with_indent_message(f, message)
    s = mktemp() do path, io
        redirect_stdout(f, io)
        flush(io)
        str = read(path, String)
        if match(r"^\s*$", str) === nothing
            replace(str, r"^"m => "│ ")
        else
            ""
        end
    end
    
    if isempty(s)
        println("start/stop: ", message)
    else
        println("start: ", message)
        print(s, endswith(s, "\n") ? "" : "\n")
        println("stop: ", message)
    end
    # f()
end