add bing search suggestion

Plugins/Flow.Launcher.Plugin.WebSearch/Settings.cs

@@ -196,7 +196,8 @@ public Settings()
         [JsonIgnore]
         public SuggestionSource[] Suggestions { get; set; } = {
             new Google(),
-            new Baidu()
+            new Baidu(),
+            new Bing()
         };
 
         [JsonIgnore]

Plugins/Flow.Launcher.Plugin.WebSearch/SuggestionSources/Bing.cs

@@ -0,0 +1,62 @@
+using Flow.Launcher.Infrastructure.Http;
+using Flow.Launcher.Infrastructure.Logger;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net.Http;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using System.Text.Json;
+using System.Linq;
+
+namespace Flow.Launcher.Plugin.WebSearch.SuggestionSources
+{
+    class Bing : SuggestionSource
+    {
+        public override async Task<List<string>> Suggestions(string query)
+        {
+            Stream resultStream;
+
+            try
+            {
+                const string api = "https://api.bing.com/qsonhs.aspx?q=";
+                resultStream = await Http.GetStreamAsync(api + Uri.EscapeUriString(query)).ConfigureAwait(false);
+            }
+            catch (HttpRequestException e)
+            {
+                Log.Exception("|Bing.Suggestions|Can't get suggestion from Bing", e);
+                return new List<string>();
+            }
+
+            if (resultStream.Length == 0) return new List<string>();
+
+            JsonElement json;
+            try
+            {
+                json = (await JsonDocument.ParseAsync(resultStream)).RootElement.GetProperty("AS");
+            }
+            catch (JsonException e)
+            {
+                Log.Exception("|Bing.Suggestions|can't parse suggestions", e);
+                return new List<string>();
+            }
+
+            if (json.GetProperty("FullResults").GetInt32() == 0)
+                return new List<string>();
+
+            return json.GetProperty("Results")
+                       .EnumerateArray()
+                       .SelectMany(r => r.GetProperty("Suggests")
+                                         .EnumerateArray()
+                                         .Select(s => s.GetProperty("Txt").GetString()))
+                       .ToList();
+
+        }
+
+        public override string ToString()
+        {
+            return "Bing";
+        }
+    }
+}

Plugins/Flow.Launcher.Plugin.WebSearch/plugin.json

@@ -25,7 +25,7 @@
   "Name": "Web Searches",
   "Description": "Provide the web search ability",
   "Author": "qianlifeng",
-  "Version": "1.1.2",
+  "Version": "1.2.0",
   "Language": "csharp",
   "Website": "https://github.com/Flow-Launcher/Flow.Launcher",
   "ExecuteFileName": "Flow.Launcher.Plugin.WebSearch.dll",