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I can see that I've got a terminal buffer open by running :ls R which finds all buffers with a running terminal job, but I don't know how to capture just the buffer number.
The closest I can get is echo bufnr("cmd.exe") because the buffer name has the command the terminal is using. This isn't crossplatform though.
bufnr("R") doesn't seem to search the flags the same was :ls R does.
By :h 'buftype'
echo filter(map(getbufinfo(), 'v:val.bufnr'), 'getbufvar(v:val, "&buftype") is# "terminal"')
By :h getwininfo()
echo uniq(map(filter(getwininfo(), 'v:val.terminal'), 'v:val.bufnr'))
