refactor: remove useless code

lua/Trans/backend/baidu.lua

@@ -4,11 +4,9 @@ local appPasswd = baidu.appPasswd
 local salt      = tostring(math.random(bit.lshift(1, 15)))
 local uri       = 'https://fanyi-api.baidu.com/api/trans/vip/translate'
 
-if appid == '' or appPasswd == '' then
-    error('请查看README, 实现在线翻译或者设置将在线翻译设置为false')
-end
+-- error('请查看README, 实现在线翻译或者设置将在线翻译设置为false')
 
-local post = require('Trans.util.curl').POST
+local post      = require('Trans.util.curl').POST
 
 local function get_field(word, isEn)
     local to   = isEn and 'zh' or 'en'
@@ -43,7 +41,7 @@ return function(word)
             if ok and res and res.trans_result then
                 result[1] = {
                     title = { word = word },
-                    [isEn and 'translation' or 'definition'] = res.trans_result[1].dst,
+                        [isEn and 'translation' or 'definition'] = res.trans_result[1].dst,
                 }
 
                 if result.callback then

lua/Trans/backend/init.lua

@@ -1,13 +1,10 @@
 local M = {}
 
-
-M.__index = function(tbl, k)
-    local res, engine = pcall(require, 'Trans.backend.' .. k)
-    assert(res, [[Can't Found Engine:]] .. k)
-
-    tbl[k] = engine
+M.__index = function(t, k)
+    local res, engine = pcall(require, [[Trans.backend.]] .. k)
+    assert(res, [[No such Backend: ]] .. k)
+    t[k] = engine
     return engine
 end
 
-
 return setmetatable(M, M)

lua/Trans/backend/offline.lua

@@ -1,12 +1,6 @@
-local _, db = pcall(require, 'sqlite.db')
-if not _ then
-    error('Please check out sqlite.lua')
-end
-
--- INFO : init database
-local path = require('Trans').conf.db_path
-local dict = db:open(path)
+local M = {}
 
+local db = require 'sqlite.db'
 vim.api.nvim_create_autocmd('VimLeavePre', {
     once = true,
     callback = function()
@@ -16,32 +10,52 @@ vim.api.nvim_create_autocmd('VimLeavePre', {
     end
 })
 
+M.query = function(opts)
+    opts = type(opts) == 'string' and { str = opts } or opts
+    if opts.is_word == false then return end
 
-return function(word)
-    local res = (dict:select('stardict', {
-        where = { word = word, },
-        keys = {
-            'word',
-            'phonetic',
-            'definition',
-            'translation',
-            'pos',
-            'collins',
-            'oxford',
-            'tag',
-            'exchange',
-        },
-        limit = 1,
-    }))[1]
 
-    if res then
-        res.title = {
-            word = res.word,
-            oxford = res.oxford,
-            collins = res.collins,
-            phonetic = res.phonetic,
-        }
-    end
+    local str       = opts.str
+    local path      = opts.path or require('Trans').conf.db_path
+    local formatter = opts.formatter or M.formatter
+    local field     = M.field or M.field
+
+
+    local dict    = db:open(path)
+    local db_name = opts.db_name or 'stardict'
+    local res     = dict:select(db_name, {
+            where = { word = str, },
+            keys = field,
+            limit = 1,
+        })[1]
+
+    return res and formatter(res) or nil
+end
+
+M.nowait = true
+
+M.field = {
+    'word',
+    'phonetic',
+    'definition',
+    'translation',
+    'pos',
+    'collins',
+    'oxford',
+    'tag',
+    'exchange',
+}
+
+
+M.formatter = function(res)
+    res.title = {
+        word = res.word,
+        oxford = res.oxford,
+        collins = res.collins,
+        phonetic = res.phonetic,
+    }
 
     return res
 end
+
+return M

lua/Trans/backend/util.lua

@@ -0,0 +1,16 @@
+local M = {}
+
+M.is_English = function(str)
+    local char = { str:byte(1, -1) }
+    for i = 1, #str do
+        if char[i] > 128 then
+            return false
+        end
+    end
+    return true
+end
+
+
+
+return M
+