How to just diff split the current buffer?

[jcorbin]

I'm trying to recover an analog of fugitive's :Gsplit but using diffview instead:

• it looks like one could just :split diffview://......
• but what's the best way to compute that "diffview path for the current buffer" url?
• basically I'm trying to make my own :DiffviewSplit command, rather than using the whole tabpage ui deal

[jcorbin]

Here's where I'm at currently:

vim.api.nvim_create_user_command('DiffviewSplit', function()
  local bufname = vim.api.nvim_buf_get_name(0)
  vim.cmd.split('diffview://' .. bufname)
  -- NOTE this doesn't work, since diffview want a url more like
  -- 'diffview://' .. gitdir .. ':0:' .. relpath
end, {})

is there some function inside require('diffview') that can get the correct url?