neovim/runtime/plugin/osc52.lua

local tty = vim.iter(vim.api.nvim_list_uis()):any(function(ui)
  return ui.chan == 1 and ui.stdout_tty
end)

if not tty or vim.g.clipboard ~= nil or vim.o.clipboard ~= '' or not os.getenv('SSH_TTY') then
  return
end

require('vim.termcap').query('Ms', function(cap, found, seq)
  if not found then
    return
  end

  assert(cap == 'Ms')

  -- Check 'clipboard' and g:clipboard again to avoid a race condition
  if vim.o.clipboard ~= '' or vim.g.clipboard ~= nil then
    return
  end

  -- If the terminal reports a sequence other than OSC 52 for the Ms capability
  -- then ignore it. We only support OSC 52 (for now)
  if not seq or not seq:match('^\027%]52') then
    return
  end

  local osc52 = require('vim.ui.clipboard.osc52')

  vim.g.clipboard = {
    name = 'OSC 52',
    copy = {
      ['+'] = osc52.copy('+'),
      ['*'] = osc52.copy('*'),
    },
    paste = {
      ['+'] = osc52.paste('+'),
      ['*'] = osc52.paste('*'),
    },
  }
end)