fix: convert buffer name to posix when hijacking directory

lua/oil/adapters/files.lua

@@ -242,7 +242,7 @@ M.normalize_url = function(url, callback)
         local is_directory
         if stat then
           is_directory = stat.type == "directory"
-        elseif vim.endswith(realpath, "/") then
+        elseif vim.endswith(realpath, "/") or (fs.is_windows and vim.endswith(realpath, "\\")) then
           is_directory = true
         else
           local filetype = vim.filetype.match({ filename = vim.fs.basename(realpath) })

lua/oil/init.lua

@@ -673,6 +673,7 @@ end
 ---@return boolean
 local function maybe_hijack_directory_buffer(bufnr)
   local config = require("oil.config")
+  local fs = require("oil.fs")
   local util = require("oil.util")
   if not config.default_file_explorer then
     return false
@@ -684,10 +685,10 @@ local function maybe_hijack_directory_buffer(bufnr)
   if util.parse_url(bufname) or vim.fn.isdirectory(bufname) == 0 then
     return false
   end
-  local replaced = util.rename_buffer(
-    bufnr,
-    util.addslash(config.adapter_to_scheme.files .. vim.fn.fnamemodify(bufname, ":p"))
+  local new_name = util.addslash(
+    config.adapter_to_scheme.files .. fs.os_to_posix_path(vim.fn.fnamemodify(bufname, ":p"))
   )
+  local replaced = util.rename_buffer(bufnr, new_name)
   return not replaced
 end
 

lua/oil/util.lua

@@ -339,7 +339,7 @@ end
 ---@param path string
 ---@return string
 M.addslash = function(path)
-  if not vim.endswith(path, "/") and not vim.endswith(path, "\\") then
+  if not vim.endswith(path, "/") then
     return path .. "/"
   else
     return path