feat: add online query support

lua/Trans/query/baidu.lua

@@ -1,17 +1,14 @@
 local baidu     = require('Trans').conf.engine.baidu
 local appid     = baidu.appid
 local appPasswd = baidu.appPasswd
-local salt      = tostring(math.random(bit.rshift(1, 5)))
+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
 
-local ok, curl = pcall(require, 'plenary.curl')
-if not ok then
-    error('plenary not found')
-end
+local post = require('Trans.util.curl').POST
 
 local function get_field(word)
     local to   = 'zh'
@@ -28,22 +25,40 @@ local function get_field(word)
     }
 end
 
+--- this is a nice plugin
+---返回一个channel
+---@param word string
+---@return function
 return function(word)
     local query = get_field(word)
-    local output = curl.post(uri, {
+    local result
+
+    post(uri, {
         data = query,
         headers = {
             content_type = "application/x-www-form-urlencoded",
-        }
+        },
+        callback = function(str)
+            if result then
+                return
+            elseif str ~= '' then
+                local res = vim.fn.json_decode(str)
+                if res and res.trans_result then
+                    result = {
+                        word = word,
+                        translation = res.trans_result[1].dst,
+                    }
+
+                else
+                    result = false
+                end
+            else
+                result = false
+            end
+        end,
     })
 
-    if output.exit == 0 and output.status == 200 then
-        local res = vim.fn.json_decode(output.body)
-        if res and res.trans_result then
-            return {
-                word = word,
-                translation = res.trans_result[1].dst,
-            }
-        end
+    return function()
+        return result
     end
 end