fix: properly resolve directories (#105)

* fix: properly resolve directories

The `vim.loop.fs_realpath()` function can be used to properly resolve
both the `.` shortcut as well as relative paths. This corrects scenarios
when opening nvim to a subdirectory of the working directory. With this
change doing so will properly resolve the session file to the directory
that was specified on the command line.

```console
$ pwd
/Users/username/.config

$ ls
fish    iterm2    nvim

$ nvim nvim
```

This will result in using the path `/Users/username/.config/nvim` for
the session. The behavior will be the same as running plain `nvim` from
within the `/Users/username/.config/nvim` directory itself.

This change also quotes the path passed to `git` to properly handle
paths containing spaces.

This change also corrects some typos in the readme.

* fix: isdirectory is not necessary

The fs_realpath function will return nil if the path doesn't exist.

* fix: typos in comments

* fix: isdirectory is still necessary

Oops, the isdirectory check is necessary to confirm it's a directory and
not a file.

README.md

@@ -248,7 +248,7 @@ require("persisted").setup({
 
 Autoloading can be further controlled for certain directories by specifying `allowed_dirs` and `ignored_dirs`.
 
-> **Note**: Autoloading will not occur if the plugin is lazy loaded or a user opens Neovim with arguments other than a single directory argument. For example: `nvim some_file.rb` will not not result in autoloading but `nvim some/existing/path` or `nvim .` will.
+> **Note**: Autoloading will not occur if the plugin is lazy loaded or a user opens Neovim with arguments other than a single directory argument. For example: `nvim some_file.rb` will not result in autoloading but `nvim some/existing/path` or `nvim .` will.
 
 ### Following current working directory
 

doc/persisted.nvim.txt

@@ -270,7 +270,7 @@ Autoloading can be further controlled for certain directories by specifying
 
   **Note**Autoloading will not occur if the plugin is lazy loaded or a user opens
   Neovim with arguments other than a single directory argument. For example:
-  `nvim some_file.rb` will not not result in autoloading but `nvim
+  `nvim some_file.rb` will not result in autoloading but `nvim
   some/existing/path` or `nvim .` will.
 
 FOLLOWING CURRENT WORKING DIRECTORY ~

lua/persisted/init.lua

@@ -19,32 +19,38 @@ local function escape_pattern(str, pattern, replace, n)
   return string.gsub(str, pattern, replace, n)
 end
 
+---Gets the directory from the file/path argument passed to Neovim if there's
+---exactly one and it resolves to a valid directory
+---@return string|nil
+local function args_path()
+  if vim.fn.argc() ~= 1 then
+    return nil
+  end
+
+  -- Use expand() to resolve '~' and use fs_realpath to resolve both '.' and
+  -- relative paths passed as arguments. Note that argv() will only ever return
+  -- paths/files passed as arguments and does not include other
+  -- parameters/arguments. fs_realpath() returns nil if the path doesn't exist.
+  -- Use isdirectory to validate it's a directory and not a file.
+  local dir = vim.loop.fs_realpath(vim.fn.expand(vim.fn.argv(0)))
+  if dir ~= nil and vim.fn.isdirectory(dir) ~= 0 then
+    return dir
+  end
+  return nil
+end
+
 ---Check any arguments passed to Neovim and verify if they're a directory
 ---@return boolean
 local function args_check()
-  if vim.fn.argc() == 1 then
-    return vim.fn.isdirectory(vim.fn.argv(0)) ~= 0
-  end
-
-  return vim.fn.argc() == 0
+  -- Args are valid if a single directory was resolved or if no args were used.
+  return args_path() ~= nil or vim.fn.argc() == 0
 end
 
 ---Get the directory to be used for the session
 ---@return string
 local function session_dir()
-  if vim.fn.argc() == 1 then
-    local dir = vim.fn.expand(vim.fn.argv(0))
-
-    if dir == "." then
-      return vim.fn.getcwd()
-    end
-
-    if vim.fn.isdirectory(dir) ~= 0 then
-      return dir
-    end
-  end
-
-  return vim.fn.getcwd()
+  -- Use specified directory from arguments or the working directory otherwise.
+  return args_path() or vim.fn.getcwd()
 end
 
 ---Does the current working directory allow for the auto-saving and loading?
@@ -92,12 +98,12 @@ function M.get_branch(dir)
   dir = dir or session_dir()
 
   if config.options.use_git_branch then
-    vim.fn.system("git -C " .. dir .. " rev-parse 2>/dev/null")
+    vim.fn.system("git -C \"" .. dir .. "\" rev-parse 2>/dev/null")
 
     local git_enabled = (vim.v.shell_error == 0)
 
     if git_enabled then
-      local git_branch = vim.fn.systemlist("git -C " .. dir .. " rev-parse --abbrev-ref HEAD 2>/dev/null")
+      local git_branch = vim.fn.systemlist("git -C \"" .. dir .. "\" rev-parse --abbrev-ref HEAD 2>/dev/null")
 
       if vim.v.shell_error == 0 then
         local branch = config.options.branch_separator .. git_branch[1]:gsub("/", "%%")