Using oil.nvim as a sidebar

Use <C-n> to toggle the sidebar. The code assumes an oil window that's 30 wide is a sidebar window. Sidebar windows have different keybindings than a regular oil window. <CR> opens the file in a different window, <C-v> and <C-s> opens it splitting the window on the right vertically or horizontally respectively.
/home/vector/.config/nvim/lua/plugins/oil.lua
return {
  "stevearc/oil.nvim",
  dependencies = {
    "nvim-tree/nvim-web-devicons",
  },
  config = function()
    local oil = require("oil")
    oil.setup({
      buf_options = {
        buflisted = true,
        bufhidden = "hide",
      },
      keymaps = {
        -- ["<C-s>"] = { "actions.select", opts = { horizontal = false, vertical = true } },
        ["<CR>"] = function()
          local cur_win_nr = vim.fn.winnr()
          local right_win_nr = vim.fn.winnr('l')
          -- Check if the width is 20

          local win_width = vim.api.nvim_win_get_width(0)
          local fpath = oil.get_current_dir() .. oil.get_cursor_entry()["name"]
          -- P({ fpath, vim.fn.isdirectory(fpath) })
          if win_width == 30 and vim.fn.isdirectory(fpath) ~= 1 then
            local buf = vim.fn.bufadd(fpath)
            vim.fn.bufload(buf)
            -- Check if there is a window to the right
            if right_win_nr ~= cur_win_nr then
              -- Get the buffer of the right window
              local right_win_id = vim.fn.win_getid(right_win_nr)
              vim.api.nvim_win_set_buf(right_win_id, buf)
            end
          else
            require("oil.actions").select["callback"]()
          end
        end,
        ["<C-v>"] = function()
          local cur_win_nr = vim.fn.winnr()
          local right_win_nr = vim.fn.winnr('l')

          -- If width of oil window is 20, we assume its the sidebar
          local win_width = vim.api.nvim_win_get_width(0)
          local fpath = oil.get_current_dir() .. oil.get_cursor_entry()["name"]
          if win_width == 30 and vim.fn.isdirectory(fpath) ~= 1 then
            -- If there is a window to the right, we will split it instead
            if right_win_nr ~= cur_win_nr then
              local right_win_id = vim.fn.win_getid(right_win_nr)
              local buf = vim.fn.bufadd(fpath)
              vim.api.nvim_open_win(buf, false, { split = 'left', win = right_win_id })
            end
          else
            require("oil.actions").select["callback"]({ vertical = true, split = "topleft" })
          end
        end,
        ["<C-s>"] = function()
          local cur_win_nr = vim.fn.winnr()
          local right_win_nr = vim.fn.winnr('l')

          -- If width of oil window is 20, we assume its the sidebar
          local win_width = vim.api.nvim_win_get_width(0)
          local fpath = oil.get_current_dir() .. oil.get_cursor_entry()["name"]
          if win_width == 30 and vim.fn.isdirectory(fpath) ~= 1 then
            -- If there is a window to the right, we will split it instead
            if right_win_nr ~= cur_win_nr then
              local right_win_id = vim.fn.win_getid(right_win_nr)
              local buf = vim.fn.bufadd(fpath)
              vim.api.nvim_open_win(buf, false, { split = 'below', win = right_win_id })
            end
          else
            require("oil.actions").select["callback"]({ horizontal = true, split = "botright" })
          end
        end
      }
    })

    vim.keymap.set("n", "-", ":Oil<CR>", { desc = "Open parent directory" })
    vim.keymap.set('n', '<C-n>', function()
      if vim.api.nvim_get_option_value('filetype', { buf = 0 }) ~= "oil"
      then
        -- Get the window to the left of the current window
        local cur_win_nr = vim.fn.winnr()
        local cur_win_id = vim.fn.win_getid(cur_win_nr)
        local left_win_nr = vim.fn.winnr('h')
        local left_win_id = vim.fn.win_getid(left_win_nr)

        -- Check if there is a window to the left
        if left_win_nr ~= cur_win_nr then
          -- Get the buffer of the left window
          local left_buf = vim.api.nvim_win_get_buf(left_win_id)

          -- Get the file type of the buffer
          local filetype = vim.api.nvim_get_option_value('filetype', { buf = left_buf })

          -- Check if the file type is 'oil'
          if filetype == 'oil' then
            -- Close
            vim.cmd(left_win_nr .. 'hide')
          else
            local sidewin = vim.api.nvim_open_win(0, false,
              { split = 'left', win = cur_win_id, width = 30, style = 'minimal' })
            vim.fn.win_execute(sidewin, 'Oil', true)
            vim.fn.win_execute(sidewin, 'set winfixwidth', true)
            vim.fn.win_execute(sidewin, 'set winfixheight', true)
          end
        else
          local sidewin = vim.api.nvim_open_win(0, false,
            { split = 'left', win = cur_win_id, width = 30, style = 'minimal' })
          vim.fn.win_execute(sidewin, 'Oil', true)
          vim.fn.win_execute(sidewin, 'set winfixwidth', true)
          vim.fn.win_execute(sidewin, 'set winfixheight', true)
          -- Open
        end
      else
        vim.cmd("hide")
      end
    end
    )
  end,
}
Using oil.nvim as a sidebar

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