feat: oil.select can close oil buffer afterwards (#121)

tests/select_spec.lua

@@ -58,4 +58,45 @@ a.describe("oil select", function()
     assert.equals(3, #vim.api.nvim_tabpage_list_wins(0))
     assert.not_equals(winid, vim.api.nvim_get_current_win())
   end)
+
+  a.describe("close after open", function()
+    a.it("same window", function()
+      vim.cmd.edit({ args = { "foo" } })
+      local bufnr = vim.api.nvim_get_current_buf()
+      oil.open()
+      test_util.wait_for_autocmd({ "User", pattern = "OilEnter" })
+      -- Go to the bottom, so the cursor is not on a directory
+      vim.cmd.normal({ args = { "G" } })
+      oil.select({ close = true })
+      assert.equals(1, #vim.api.nvim_tabpage_list_wins(0))
+      -- This one we actually don't expect the buffer to be the same as the initial buffer, because
+      -- we opened a file
+      assert.not_equals(bufnr, vim.api.nvim_get_current_buf())
+      assert.not_equals("oil", vim.bo.filetype)
+    end)
+
+    a.it("split", function()
+      vim.cmd.edit({ args = { "foo" } })
+      local bufnr = vim.api.nvim_get_current_buf()
+      local winid = vim.api.nvim_get_current_win()
+      oil.open()
+      test_util.wait_for_autocmd({ "User", pattern = "OilEnter" })
+      oil.select({ vertical = true, close = true })
+      assert.equals(2, #vim.api.nvim_tabpage_list_wins(0))
+      assert.equals(bufnr, vim.api.nvim_win_get_buf(winid))
+    end)
+
+    a.it("tab", function()
+      vim.cmd.edit({ args = { "foo" } })
+      local bufnr = vim.api.nvim_get_current_buf()
+      local tabpage = vim.api.nvim_get_current_tabpage()
+      oil.open()
+      test_util.wait_for_autocmd({ "User", pattern = "OilEnter" })
+      oil.select({ tab = true, close = true })
+      assert.equals(1, #vim.api.nvim_tabpage_list_wins(0))
+      assert.equals(2, #vim.api.nvim_list_tabpages())
+      vim.api.nvim_set_current_tabpage(tabpage)
+      assert.equals(bufnr, vim.api.nvim_get_current_buf())
+    end)
+  end)
 end)