fix: fix plugin_dir and use left slash as path separator for windows

Fixes #46

lua/Trans/backend/offline.lua

@@ -1,7 +1,7 @@
 local Trans   = require 'Trans'
 
 local db      = require 'sqlite.db'
-local path    = Trans.conf.dir .. Trans.separator .. 'ultimate.db'
+local path    = Trans.conf.dir .. '/ultimate.db'
 local dict    = db:open(path)
 local db_name = 'stardict'
 vim.api.nvim_create_autocmd('VimLeavePre', {

lua/Trans/core/install.lua

@@ -5,7 +5,7 @@ return function()
     local fn = vim.fn
     -- INFO :Check ultimate.db exists
     local dir = Trans.conf.dir
-    local path = dir .. 'ultimate.db'
+    local path = dir .. '/ultimate.db'
 
     if fn.isdirectory(dir) == 0 then
         fn.mkdir(dir, 'p')
@@ -18,7 +18,7 @@ return function()
 
     -- INFO :Download ultimate.db
     local uri = 'https://github.com/skywind3000/ECDICT-ultimate/releases/download/1.0.0/ecdict-ultimate-sqlite.zip'
-    local zip = dir .. 'ultimate.zip'
+    local zip = dir .. '/ultimate.zip'
     local continue = fn.filereadable(zip) == 1
     local handle = function(output)
         if output.exit == 0 and fn.filereadable(zip) then

lua/Trans/health.lua

@@ -57,7 +57,7 @@ local function check_binary_dependencies()
 end
 
 local function check_database()
-    local db_path = Trans.conf.dir .. Trans.separator .. 'ultimate.db'
+    local db_path = Trans.conf.dir .. '/ultimate.db'
     if fn.filereadable(db_path) == 1 then
         ok [[ultimate database found ]]
     else
@@ -69,7 +69,7 @@ local function check_database()
 end
 
 local function check_configure_file()
-    local path = fn.expand(Trans.conf.dir .. Trans.separator .. 'Trans.json')
+    local path = fn.expand(Trans.conf.dir .. '/Trans.json')
     if not fn.filereadable(path) then
         warn 'Backend configuration file[%s] not found'
     end

lua/Trans/init.lua

@@ -25,19 +25,16 @@ local system =
     uname == 'Linux' and (vim.fn.executable 'termux-api-start' == 1 and 'termux' or 'linux') or
     error 'Unknown System, Please Report Issue'
 
-local sep = system == 'win' and '\\\\' or '/'
 ---@class Trans
 ---@field style table @Style module
 ---@field cache table<string, TransData> @Cache for translated data object
 ---@field plugin_dir string @Plugin directory
----@field separator string @Path separator
+---@field system 'mac'|'win'|'termux'|'linux' @Operating system
----@field system 'mac'|'win'|'termux'|'linux' @Path separator
 local M = metatable('core', {
     cache      = {},
     style      = metatable 'style',
-    separator  = sep,
     system     = system,
-    plugin_dir = debug.getinfo(1, 'S').source:sub(2):match('(.-)lua' .. sep .. 'Trans'),
+    plugin_dir = vim.fn.fnamemodify(debug.getinfo(1, 'S').source:sub(2), ':p:h:h:h'),
 })
 
 M.metatable = metatable