fix: Not downloadable binary

closes https://github.com/dmtrKovalenko/fff.nvim/issues/196

This issue was related to the fact that I chagned vim.mkdir to
vim.uv.fs_mkdir but it is not recursive so when you installed a fresh
version it never created the dir for it.

lua/fff/download.lua

@@ -1,6 +1,5 @@
 local M = {}
 local system = require('fff.utils.system')
-local uv = vim and vim.uv or require('luv')
 
 local GITHUB_REPO = 'dmtrKovalenko/fff.nvim'
 
@@ -24,7 +23,7 @@ end
 
 local function binary_exists(plugin_dir)
   local binary_path = get_binary_path(plugin_dir)
-  local stat = uv.fs_stat(binary_path)
+  local stat = vim.uv.fs_stat(binary_path)
   return stat and stat.type == 'file'
 end
 
@@ -32,9 +31,10 @@ local function download_file(url, output_path, opts, callback)
   opts = opts or {}
 
   local dir = vim.fn.fnamemodify(output_path, ':h')
-  uv.fs_mkdir(dir, 493, function(err) -- 493 = 0755 octal
-    if err and not err:match('EEXIST') then
-      callback(false, 'Failed to create directory: ' .. err)
+
+  mkdir_recursive(dir, function(mkdir_ok, mkdir_err)
+    if not mkdir_ok then
+      callback(false, mkdir_err)
       return
     end
 
@@ -89,7 +89,7 @@ local function download_from_github(version, binary_path, opts, callback)
     local ok, err_msg = pcall(function() package.loadlib(binary_path, 'luaopen_fff_nvim') end)
 
     if not ok then
-      uv.fs_unlink(binary_path)
+      vim.uv.fs_unlink(binary_path)
       callback(false, 'Downloaded binary is not valid: ' .. (err_msg or 'unknown error'))
       return
     end

lua/fff/rust/init.lua

@@ -37,6 +37,7 @@ local function try_load_library()
     local stat = vim.uv.fs_stat(actual_path)
     if stat and stat.type == 'file' then
       local loader, err = package.loadlib(actual_path, 'luaopen_fff_nvim')
+      if err then return nil, string.format('Error loading library from %s: %s', actual_path, err) end
       if loader then return loader() end
     end
   end
@@ -44,12 +45,13 @@ local function try_load_library()
 end
 
 local backend, load_err = try_load_library()
-if not backend then
+if not backend or load_err then
   local err_msg = string.format(
-    'Failed to load fff rust backend.\nError: %s\nSearched paths:\n%s\nMake sure binary exists with `cargo build --release`',
+    'Failed to load fff rust backend.\nError: %s\nSearched paths:\n%s\nMake sure binary exists or make it exists using \n `:lua require("fff.download").download_or_build_binary()`\nor\n`cargo build --release`\n(and rerun neovim after)',
     tostring(load_err),
     vim.inspect(paths)
   )
+
   error(err_msg)
 end
 

lua/fff/utils.lua

@@ -59,4 +59,35 @@ function M.is_one_of(value, values)
   return false
 end
 
+-- Recursively create directories using uv.fs_mkdir
+local function mkdir_recursive(path, callback)
+  vim.uv.fs_stat(path, function(err, stat)
+    if not err and stat then
+      callback(true, nil)
+      return
+    end
+
+    local parent = vim.fn.fnamemodify(path, ':h')
+    if parent == path or parent == '' or parent == '.' then
+      callback(false, 'Cannot create root directory')
+      return
+    end
+
+    mkdir_recursive(parent, function(parent_ok, parent_err)
+      if not parent_ok then
+        callback(false, parent_err)
+        return
+      end
+
+      uv.fs_mkdir(path, 493, function(mkdir_err) -- 493 = 0755 octal
+        if mkdir_err and not mkdir_err:match('EEXIST') then
+          callback(false, 'Failed to create directory: ' .. mkdir_err)
+          return
+        end
+        callback(true, nil)
+      end)
+    end)
+  end)
+end
+
 return M