refactor: rewrite setup and conf module

lua/Trans/backend/baidu.lua

@@ -1,15 +1,11 @@
----@class Baidu: TransOnlineBackend
+---@class Baidu: TransBackendOnline
----@field uri string api uri
+---@field conf { app_id: string, app_passwd: string }
----@field salt string
----@field app_id string
----@field app_passwd string
----@field disable boolean
 local M = {
-    uri     = 'https://fanyi-api.baidu.com/api/trans/vip/translate',
+    name         = 'baidu',
-    salt    = tostring(math.random(bit.lshift(1, 15))),
+    display_text = '百度',
-    name    = 'baidu',
+    uri          = 'https://fanyi-api.baidu.com/api/trans/vip/translate',
-    name_zh = '百度',
+    salt         = tostring(math.random(bit.lshift(1, 15))),
-    method  = 'get',
+    method       = 'get',
 }
 
 local Trans = require 'Trans'
@@ -25,26 +21,28 @@ local Trans = require 'Trans'
 ---Get content for query
 ---@param data TransData
 ---@return BaiduQuery
-local function get_query(data)
+function M.get_query(data)
-    local tmp  = M.app_id .. data.str .. M.salt .. M.app_passwd
+    local m_conf = M.conf
+    assert(m_conf, 'Load Baidu config failed')
+
+    local tmp  = m_conf.app_id .. data.str .. M.salt .. m_conf.app_passwd
     local sign = Trans.util.md5.sumhexa(tmp)
 
     return {
         q     = data.str,
         from  = data.from,
         to    = data.to,
-        appid = M.app_id,
+        appid = m_conf.app_id,
         salt  = M.salt,
         sign  = sign,
     }
 end
 
-
 ---@overload fun(body: table, data:TransData): TransResult
 ---Query Using Baidu API
 ---@param body table BaiduQuery Response
 ---@return table|false
-local function formatter(body, data)
+function M.formatter(body, data)
     local result = body.trans_result
     if not result then return false end
 
@@ -57,17 +55,7 @@ local function formatter(body, data)
     }
 end
 
-
+return M
----@class TransBackendCore
----@field baidu Baidu
-return {
-    name         = 'baidu',
-    display_text = '百度',
-    uri          = 'https://fanyi-api.baidu.com/api/trans/vip/translate',
-    method       = 'get',
-    get_query    = get_query,
-    formatter    = formatter,
-}
 
 
 

lua/Trans/backend/youdao.lua

@@ -1,15 +1,14 @@
----@class Youdao: TransOnlineBackend
+---@class Youdao: TransBackendOnline
 ---@field uri string api uri
 ---@field salt string
----@field app_id string
----@field app_passwd string
 ---@field disable boolean
+---@field conf { app_id: string, app_passwd: string }
 local M = {
-    uri     = 'https://openapi.youdao.com/api',
+    uri          = 'https://openapi.youdao.com/api',
-    salt    = tostring(math.random(bit.lshift(1, 15))),
+    name         = 'youdao',
-    name    = 'youdao',
+    display_text = '有道',
-    name_zh = '有道',
+    method       = 'get',
-    method  = 'get',
+    salt         = tostring(math.random(bit.lshift(1, 15))),
 }
 
 ---@class YoudaoQuery
@@ -26,7 +25,7 @@ local M = {
 ---@return YoudaoQuery
 function M.get_query(data)
     local str     = data.str
-    local app_id  = M.app_id
+    local m_conf  = M.conf
     local salt    = M.salt
     local curtime = tostring(os.time())
 
@@ -38,7 +37,7 @@ function M.get_query(data)
 
 
     -- sign=sha256(应用ID+input+salt+curtime+应用密钥)； 一二三四五六七八九十
-    local hash = app_id .. input .. salt .. curtime .. M.app_passwd
+    local hash = m_conf.app_id .. input .. salt .. curtime .. m_conf.app_passwd
     local sign = vim.fn.sha256(hash)
 
 
@@ -47,7 +46,7 @@ function M.get_query(data)
         to       = data.from == 'zh' and 'en' or 'zh-CHS',
         from     = 'auto',
         signType = 'v3',
-        appKey   = app_id,
+        appKey   = m_conf.app_id,
         salt     = M.salt,
         curtime  = curtime,
         sign     = sign,
@@ -160,6 +159,26 @@ end
 ---@class TransBackend
 ---@field youdao Youdao
 return M
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
 
 -- INFO :Query Result Example
 -- {

lua/Trans/core/animation.lua

@@ -0,0 +1,8 @@
+local Trans = require'Trans'
+
+---@class Trans
+local M = {}
+
+
+
+return M

lua/Trans/core/backend.lua

@@ -10,9 +10,11 @@ local Trans = require 'Trans'
 ---@class TransBackendOnline: TransBackend
 ---@field uri string @request uri
 ---@field method 'get' | 'post' @request method
----@field formatter fun(body: table, data: TransData): TransResult|false|nil @formatter
+---@field formatter fun(body: table, data: TransData): TransResult|false|nil transform response body to TransResult
 ---@field get_query fun(data: TransData): table<string, any> @get query table
+---@field error_message? fun(errorCode) @get error message
 
+-- -@field header table<string, string>|fun(data: TransData): table<string, string> @request header
 
 
 ---@class TransBackendOffline: TransBackend
@@ -22,56 +24,41 @@ local Trans = require 'Trans'
 
 ---@class TransBackendCore
 local M = {
-    ---@type table<string, TransBackend>
+    ---@type table<string, TransBackend> backendname -> backend source
     sources = {},
 }
 
 local m_util = {}
 
 -- INFO :Template method for online query
--- ---@param data TransData @data
+---@param data TransData @data
--- ---@param backend TransOnlineBackend @backend
+---@param backend TransBackendOnline @backend
--- function M.do_query(data, backend)
+function M.do_query(data, backend)
---     local name      = backend.name
+    local name      = backend.name
---     local uri       = backend.uri
+    local formatter = backend.formatter
---     local method    = backend.method
+    -- local header    = type(backend.header) == 'function' and backend.header(data) or backend.header
---     local formatter = backend.formatter
---     local query     = backend.get_query(data)
---     local header    = type(backend.header) == 'function' and backend.header(data) or backend.header
-
---     local function handle(output)
---         local status, body = pcall(vim.json.decode, output.body)
---         if not status or not body then
---             if not Trans.conf.debug then
---                 backend.debug(body)
---                 data.trace[name] = output
---             end
-
---             data.result[name] = false
---             return
---         end
-
---         data.result[name] = formatter(body, data)
---     end
-
---     Trans.curl[method](uri, {
---         query = query,
---         callback = handle,
---         header = header,
---     })
---     -- Hook ?
--- end
-
-
 
+    local function handle(output)
+        local status, body = pcall(vim.json.decode, output.body)
+        if not status or not body then
+            data.result[name] = false
+            return
+        end
 
+        data.result[name] = formatter(body, data)
+    end
 
+    Trans.curl[backend.method](backend.uri, {
+        query = backend.get_query(data),
+        callback = handle,
+        --- FIXME :
+        header = header,
+    })
+end
 
 -- TODO :Implement all of utility functions
-
-
 M.util = m_util
-M.random_num = math.random(bit.lshift(1, 15))
+
 
 -- INFO :Parse configuration file
 local path = Trans.conf.dir .. '/Trans.json'
@@ -82,6 +69,7 @@ if file then
     user_conf = vim.json.decode(content) or user_conf
     file:close()
 end
+
 -- WARNING : [Breaking change] 'Trans.json' should use json object instead of array
 
 ---@class Trans

lua/Trans/core/conf.lua

@@ -1,168 +0,0 @@
----@class Trans
----@field conf TransConf
-
-
----@alias TransMode 'visual' 'input'
-
----@class TransConf
-return {
-    ---@type string the directory for database file and password file
-    dir      = require 'Trans'.plugin_dir,
-    ---@type 'default' | 'dracula' | 'tokyonight' global Trans theme [@see lua/Trans/style/theme.lua]
-    theme    = 'default', -- default | tokyonight | dracula
-    ---@type table<TransMode, { frontend:string, backend:string | string[] }> fallback strategy for mode
-    strategy = {
-        default = {
-            frontend = 'hover',
-            backend = {
-                'offline',
-                -- 'youdao',
-                -- 'baidu',
-            }
-        },
-        -- input = {
-        -- visual = {
-        -- ...
-    },
-    ---@type table frontend options
-    frontend = {
-        ---@class TransFrontendOpts
-        ---@field keymaps table<string, string>
-        default = {
-            auto_play = true,
-            query     = 'fallback',
-            border    = 'rounded',
-            title     = vim.fn.has 'nvim-0.9' == 1 and {
-                    { '',       'TransTitleRound' },
-                    { ' Trans', 'TransTitle' },
-                    { '',       'TransTitleRound' },
-                } or nil, -- need nvim-0.9+
-            ---@type {open: string | boolean, close: string | boolean, interval: integer} Hover Window Animation
-            animation = {
-                open = 'slid', -- 'fold', 'slid'
-                close = 'slid',
-                interval = 12,
-            },
-            timeout   = 2000,
-        },
-        ---@class TransHoverOpts : TransFrontendOpts
-        hover = {
-            ---@type integer Max Width of Hover Window
-            width             = 37,
-            ---@type integer Max Height of Hover Window
-            height            = 27,
-            ---@type string -- see: /lua/Trans/style/spinner
-            spinner           = 'dots',
-            ---@type string
-            fallback_message  = '{{notfound}} {{error_message}}',
-            auto_resize       = true,
-            split_width       = 60,
-            padding           = 10, -- padding for hover window width
-            keymaps           = {
-                -- pageup       = '<C-u>',
-                -- pagedown     = '<C-d>',
-                -- pin          = '<leader>[',
-                -- close        = '<leader>]',
-                -- toggle_entry = '<leader>;',
-            },
-            ---@type string[] auto close events
-            auto_close_events = {
-                'InsertEnter',
-                'CursorMoved',
-                'BufLeave',
-            },
-            ---@type table<string, string[]> order to display translate result
-            order             = {
-                default = {
-                    'str',
-                    'translation',
-                    'definition',
-                },
-                offline = {
-                    'title',
-                    'tag',
-                    'pos',
-                    'exchange',
-                    'translation',
-                    'definition',
-                },
-                youdao = {
-                    'title',
-                    'translation',
-                    'definition',
-                    'web',
-                },
-            },
-            icon              = {
-                -- or use emoji
-                list        = '●', -- ● | ○ | ◉ | ◯ | ◇ | ◆ | ▪ | ▫ | ⬤ | 🟢 | 🟡 | 🟣 | 🟤 | 🟠| 🟦 | 🟨 | 🟧 | 🟥 | 🟪 | 🟫 | 🟩 | 🟦
-                star        = '', -- ⭐ | ✴ | ✳ | ✲ | ✱ | ✰ | ★ | ☆ | 🌟 | 🌠 | 🌙 | 🌛 | 🌜 | 🌟 | 🌠 | 🌌 | 🌙 |
-                notfound    = ' ', --❔ | ❓ | ❗ | ❕|
-                yes         = '✔', -- ✅ | ✔️ | ☑
-                no          = '', -- ❌ | ❎ | ✖ | ✘ | ✗ |
-                cell        = '■', -- ■  | □ | ▇ | ▏ ▎ ▍ ▌ ▋ ▊ ▉
-                web         = '󰖟', --🌍 | 🌎 | 🌏 | 🌐 |
-                tag         = '',
-                pos         = '',
-                exchange    = '',
-                definition  = '󰗊',
-                translation = '󰊿',
-            },
-        },
-    },
-
-
-
-   -- debug    = true,
-}
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
--- TODO :
--- float = {
---     width = 0.8,
---     height = 0.8,
---     border = 'rounded',
---     keymap = {
---         quit = 'q',
---     },
---     animation = {
---         open = 'fold',
---         close = 'fold',
---         interval = 10,
---     },
---     tag = {
---         wait = '#519aba',
---         fail = '#e46876',
---         success = '#10b981',
---     },
--- },
-
-
--- local title = {
---     "████████╗██████╗  █████╗ ███╗   ██╗███████╗",
---     "╚══██╔══╝██╔══██╗██╔══██╗████╗  ██║██╔════╝",
---     "   ██║   ██████╔╝███████║██╔██╗ ██║███████╗",
---     "   ██║   ██╔══██╗██╔══██║██║╚██╗██║╚════██║",
---     "   ██║   ██║  ██║██║  ██║██║ ╚████║███████║",
---     "   ╚═╝   ╚═╝  ╚═╝╚═╝  ╚═╝╚═╝  ╚═══╝╚══════╝",
---}

lua/Trans/core/frontend.lua

@@ -1,10 +1,33 @@
-local Trans         = require 'Trans'
+local Trans            = require 'Trans'
-local frontend_opts = Trans.conf.frontend
+
+---@class TransFrontendOpts
+local default_frontend = {
+    auto_play = true,
+    query     = 'fallback',
+    border    = 'rounded',
+    title     = vim.fn.has 'nvim-0.9' == 1 and {
+        { '',       'TransTitleRound' },
+        { ' Trans', 'TransTitle' },
+        { '',       'TransTitleRound' },
+    } or nil, -- need nvim-0.9+
+    ---@type {open: string | boolean, close: string | boolean, interval: integer} Window Animation
+    animation = {
+        open = 'slid', -- 'fold', 'slid'
+        close = 'slid',
+        interval = 12,
+    },
+    timeout   = 2000, -- only for online backend query 
+}
+
+if Trans.conf.frontend.default then
+    default_frontend = vim.tbl_extend('force', default_frontend, Trans.conf.frontend.default)
+end
+
 
 ---@class TransFrontend
----@field opts TransFrontendOpts
+---@field opts? TransFrontendOpts options which user can set
 ---@field get_active_instance fun():TransFrontend?
----@field process fun(self: TransFrontend, data: TransData)
+---@field process fun(self: TransFrontend, data: TransData) @render backend result
 ---@field wait fun(self: TransFrontend): fun(backend: TransBackend): boolean Update wait status
 ---@field execute fun(action: string) @Execute action for frontend instance
 ---@field fallback fun() @Fallback method when no result
@@ -14,17 +37,17 @@ local frontend_opts = Trans.conf.frontend
 ---@field frontend TransFrontend
 return setmetatable({}, {
     __index = function(self, name)
-        local opts = vim.tbl_extend('keep', frontend_opts[name] or {}, frontend_opts.default)
-
         ---@type TransFrontend
         local frontend = require('Trans.frontend.' .. name)
 
-        frontend.opts = opts
+        frontend.opts =
-        self[name] = frontend
+            vim.tbl_extend('force', frontend.opts or {}, default_frontend, Trans.conf.frontend[name])
 
         if frontend.setup then
             frontend.setup()
         end
+
+        rawset(self, name, frontend)
         return frontend
     end,
 })

lua/Trans/core/helper.lua

@@ -0,0 +1,19 @@
+local fn, api = vim.fn, vim.api
+local Trans = require 'Trans'
+
+---@class TransHelper for Trans module dev
+local M = {}
+
+
+---Get abs_path of file
+---@param path string[]
+---@param is_dir boolean? [default]: false
+---@return string @Generated path
+function M.relative_path(path, is_dir)
+    return Trans.plugin_dir .. table.concat(path, Trans.separator) .. (is_dir and Trans.separator or '')
+end
+
+
+
+
+return M

lua/Trans/core/loader.lua

@@ -1,6 +0,0 @@
-local M = {}
-
--- TODO :
-
-
-return M

lua/Trans/core/setup.lua

@@ -1,44 +1,31 @@
+---@class Trans
 local Trans = require 'Trans'
 
--- local function set_strategy_opts(conf)
+---@alias TransMode 'visual' 'input'
---     local all_backends = conf.frontend.default.enabled_backend
+local default_strategy = {
---     local g_strategy = conf.strategy
+    frontend = 'hover',
+    backend  = {
+        'offline',
+        -- 'youdao',
+        -- 'baidu',
+    },
+}
 
---     local function parse_backend(backend)
+Trans.conf = {
---         if type(backend) == 'string' then
+    ---@type string the directory for database file and password file
---             return backend == '*' and all_backends or { backend }
+    dir      = require 'Trans'.plugin_dir,
---         end
+    ---@type 'default' | 'dracula' | 'tokyonight' global Trans theme [@see lua/Trans/style/theme.lua]
+    theme    = 'default',
+    ---@type table<TransMode, { frontend:string, backend:string | string[] }> fallback strategy for mode
+    -- input = {
+    -- visual = {
+    -- ...
+    strategy = vim.defaulttable(function()
+        return setmetatable({}, default_strategy)
+    end),
+    frontend = {},
+}
 
---         return backend
---     end
-
---     local default_strategy = g_strategy.default
---     default_strategy.backend = parse_backend(default_strategy.backend)
---     default_strategy.__index = default_strategy
-
---     g_strategy.default = nil
-
---     setmetatable(g_strategy, {
---         __index = function()
---             return default_strategy
---         end,
---     })
-
---     for _, strategy in pairs(g_strategy) do
---         strategy.backend = parse_backend(strategy.backend)
---         setmetatable(strategy, default_strategy)
---     end
--- end
-
-
-
-local function define_highlights(conf)
-    local set_hl     = vim.api.nvim_set_hl
-    local highlights = Trans.style.theme[conf.theme]
-    for hl, opt in pairs(highlights) do
-        set_hl(0, hl, opt)
-    end
-end
 
 
 ---@class Trans
@@ -48,8 +35,12 @@ return function(opts)
         Trans.conf = vim.tbl_deep_extend('force', Trans.conf, opts)
     end
     local conf = Trans.conf
-    conf.dir = vim.fn.expand(conf.dir)
+    conf.dir   = vim.fn.expand(conf.dir)
 
-    -- set_strategy_opts(conf)
+    -- INFO : set highlight
-    define_highlights(conf)
+    local set_hl     = vim.api.nvim_set_hl
+    local highlights = Trans.style.theme[conf.theme]
+    for hl, opt in pairs(highlights) do
+        set_hl(0, hl, opt)
+    end
 end

lua/Trans/core/util.lua

@@ -3,7 +3,6 @@ local fn, api = vim.fn, vim.api
 ---@class TransUtil
 local M = require 'Trans'.metatable 'util'
 
-
 ---Get selected text
 ---@return string
 function M.get_select()

lua/Trans/frontend/float.lua

@@ -121,3 +121,34 @@ return M
 --     iciba   = 'iciba',
 --     offline = '本地',
 -- }
+
+
+-- TODO :
+-- float = {
+--     width = 0.8,
+--     height = 0.8,
+--     border = 'rounded',
+--     keymap = {
+--         quit = 'q',
+--     },
+--     animation = {
+--         open = 'fold',
+--         close = 'fold',
+--         interval = 10,
+--     },
+--     tag = {
+--         wait = '#519aba',
+--         fail = '#e46876',
+--         success = '#10b981',
+--     },
+-- },
+
+
+-- local title = {
+--     "████████╗██████╗  █████╗ ███╗   ██╗███████╗",
+--     "╚══██╔══╝██╔══██╗██╔══██╗████╗  ██║██╔════╝",
+--     "   ██║   ██████╔╝███████║██╔██╗ ██║███████╗",
+--     "   ██║   ██╔══██╗██╔══██║██║╚██╗██║╚════██║",
+--     "   ██║   ██║  ██║██║  ██║██║ ╚████║███████║",
+--     "   ╚═╝   ╚═╝  ╚═╝╚═╝  ╚═╝╚═╝  ╚═══╝╚══════╝",
+--}

lua/Trans/frontend/hover/init.lua

@@ -10,18 +10,82 @@ local util = Trans.util
 ---@field window TransWindow @hover window
 ---@field queue TransHover[] @hover queue for all hover instances
 ---@field destroy_funcs fun(hover:TransHover)[] @functions to be executed when hover window is closed
----@field opts TransHoverOpts @options for hover window
+---@field opts TransHoverOpts @hover window options
 ---@field pin boolean @whether hover window is pinned
 local M = Trans.metatable('frontend.hover', {
     ns = vim.api.nvim_create_namespace 'TransHoverWin',
     queue = {},
+    ---@class TransHoverOpts: TransFrontendOpts
+    opts = {
+        ---@type integer Max Width of Hover Window
+        width             = 37,
+        ---@type integer Max Height of Hover Window
+        height            = 27,
+        ---@type string -- see: /lua/Trans/style/spinner
+        spinner           = 'dots',
+        ---@type string
+        fallback_message  = '{{notfound}} {{error_message}}',
+        auto_resize       = true,
+        split_width       = 60,
+        padding           = 10, -- padding for hover window width
+        keymaps           = {
+            -- pageup       = '<C-u>',
+            -- pagedown     = '<C-d>',
+            -- pin          = '<leader>[',
+            -- close        = '<leader>]',
+            -- toggle_entry = '<leader>;',
+        },
+        ---@type string[] auto close events
+        auto_close_events = {
+            'InsertEnter',
+            'CursorMoved',
+            'BufLeave',
+        },
+        ---@type table<string, string[]> order to display translate result
+        order             = {
+            default = {
+                'str',
+                'translation',
+                'definition',
+            },
+            offline = {
+                'title',
+                'tag',
+                'pos',
+                'exchange',
+                'translation',
+                'definition',
+            },
+            youdao = {
+                'title',
+                'translation',
+                'definition',
+                'web',
+            },
+        },
+        icon              = {
+            -- or use emoji
+            list        = '●', -- ● | ○ | ◉ | ◯ | ◇ | ◆ | ▪ | ▫ | ⬤ | 🟢 | 🟡 | 🟣 | 🟤 | 🟠| 🟦 | 🟨 | 🟧 | 🟥 | 🟪 | 🟫 | 🟩 | 🟦
+            star        = '', -- ⭐ | ✴ | ✳ | ✲ | ✱ | ✰ | ★ | ☆ | 🌟 | 🌠 | 🌙 | 🌛 | 🌜 | 🌟 | 🌠 | 🌌 | 🌙 |
+            notfound    = ' ', --❔ | ❓ | ❗ | ❕|
+            yes         = '✔', -- ✅ | ✔️ | ☑
+            no          = '', -- ❌ | ❎ | ✖ | ✘ | ✗ |
+            cell        = '■', -- ■  | □ | ▇ | ▏ ▎ ▍ ▌ ▋ ▊ ▉
+            web         = '󰖟', --🌍 | 🌎 | 🌏 | 🌐 |
+            tag         = '',
+            pos         = '',
+            exchange    = '',
+            definition  = '󰗊',
+            translation = '󰊿',
+        },
+    },
 })
 M.__index = M
 
 
+
 --[[
 Set up function which will be invoked when this module is loaded
-
 Because the options are not loaded yet when this module is loaded
 --]]
 function M.setup()
@@ -146,7 +210,7 @@ function M:wait()
     local it      = util.node.item
     return function(backend)
         cur = cur + 1
-        buffer[1] = pr(backend.name_zh)
+        buffer[1] = pr(backend.display_text)
         buffer[2] = it { spinner[cur % size + 1] .. (cell):rep(cur), 'TransWaitting' }
         pause(interval)
         return cur < times

lua/Trans/init.lua

@@ -5,8 +5,8 @@
 local function metatable(folder_name, origin)
     return setmetatable(origin or {}, {
         __index = function(tbl, key)
-            local status, result = pcall(require, ('Trans.%s.%s'):format(folder_name, key))
+            local found, result = pcall(require, ('Trans.%s.%s'):format(folder_name, key))
-            if status then
+            if found then
                 rawset(tbl, key, result)
                 return result
             end
@@ -18,6 +18,8 @@ end
 ---@class string
 ---@field width function @Get string display width
 ---@field play function @Use tts to play string
+
+
 local uname = vim.loop.os_uname().sysname
 local system =
     uname == 'Darwin' and 'mac' or
@@ -26,7 +28,8 @@ local system =
     error 'Unknown System, Please Report Issue'
 
 
-local sep = system == 'win' and '\\\\' or '/'
+local separator = system == 'win' and '\\\\' or '/'
+
 ---@class Trans
 ---@field style table @Style module
 ---@field cache table<string, TransData> @Cache for translated data object
@@ -38,20 +41,12 @@ local M = metatable('core', {
     cache      = {},
     style      = metatable 'style',
     strategy   = metatable 'strategy',
-    separator  = sep,
+    separator  = separator,
     system     = system,
-    plugin_dir = debug.getinfo(1, 'S').source:sub(2):match('(.-)lua' .. sep .. 'Trans'),
+    plugin_dir = debug.getinfo(1, 'S').source:sub(2):match('(.-)lua' .. separator .. 'Trans'),
 })
 
-
 M.metatable = metatable
 
----Get abs_path of file
----@param path string[]
----@param is_dir boolean?
----@return string
-function M.relative_path(path, is_dir)
-    return M.plugin_dir .. table.concat(path, sep) .. (is_dir and sep or '')
-end
 
 return M