feat: convert oil://path/to/file.lua to normal file path (#77)

lua/oil/adapters/files.lua

@@ -180,7 +180,17 @@ M.normalize_url = function(url, callback)
     vim.loop.fs_stat(
       realpath,
       vim.schedule_wrap(function(stat_err, stat)
-        if not stat or stat.type == "directory" then
+        local is_directory
+        if stat then
+          is_directory = stat.type == "directory"
+        elseif vim.endswith(realpath, "/") then
+          is_directory = true
+        else
+          local filetype = vim.filetype.match({ filename = vim.fs.basename(realpath) })
+          is_directory = filetype == nil
+        end
+
+        if is_directory then
           local norm_path = util.addslash(fs.os_to_posix_path(realpath))
           callback(scheme .. norm_path)
         else

lua/oil/init.lua

@@ -614,6 +614,17 @@ local function load_oil_buffer(bufnr)
           -- have BufReadCmd called for it
           return
         end
+
+        -- If the renamed buffer doesn't have a scheme anymore, this is a normal file.
+        -- Finish setting it up as a normal buffer.
+        local new_scheme = util.parse_url(new_url)
+        if not new_scheme then
+          loading.set_loading(bufnr, false)
+          vim.cmd.doautocmd({ args = { "BufReadPre", new_url }, mods = { emsg_silent = true } })
+          vim.cmd.doautocmd({ args = { "BufReadPost", new_url }, mods = { emsg_silent = true } })
+          return
+        end
+
         bufname = new_url
       end
       if vim.endswith(bufname, "/") then