local util = require('extregs.util')
local storage = require('extregs.storage')
local M = {}
function M.get_provider(cfg)
  local function run(cmd, input)
    local argv = { 'tmux', cmd }
    if cfg.buffer ~= nil then
      assert(type(cfg.buffer) == 'string' and cfg.buffer ~= '', 'tmux.buffer must be a nonempty string')
      vim.list_extend(argv, { '-b', cfg.buffer })
    end
    if cmd == 'load-buffer' then argv[#argv + 1] = '-' end
    return util.system(argv, input, 'tmux')
  end
  return {
    read = function() return storage.decode(run('show-buffer')) end,
    write = function(_, reg)
      local data = table.concat(reg.lines, '\n')
      if reg.type == 'V' then data = data .. '\n' end
      run('load-buffer', data)
      return true
    end,
  }
end
return M