Add null check before enumerating the enumerable

Author: taooceros

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

@@ -41,8 +41,8 @@ public async Task<List<Result>> QueryAsync(Query query, CancellationToken token)
             var results = new List<Result>();
 
             foreach (SearchSource searchSource in _settings.SearchSources.Where(o => (o.ActionKeyword == query.ActionKeyword ||
-                                                                  o.ActionKeyword == SearchSourceGlobalPluginWildCardSign)
-                                                && o.Enabled))
+                                                                                      o.ActionKeyword == SearchSourceGlobalPluginWildCardSign)
+                                                                                     && o.Enabled))
             {
                 string keyword = string.Empty;
                 keyword = searchSource.ActionKeyword == SearchSourceGlobalPluginWildCardSign ? query.ToString() : query.Search;
@@ -85,8 +85,7 @@ public async Task<List<Result>> QueryAsync(Query query, CancellationToken token)
 
                 ResultsUpdated?.Invoke(this, new ResultUpdatedEventArgs
                 {
-                    Results = results,
-                    Query = query
+                    Results = results, Query = query
                 });
 
                 await UpdateResultsFromSuggestionAsync(results, keyword, subtitle, searchSource, query, token).ConfigureAwait(false);
@@ -105,11 +104,11 @@ private async Task UpdateResultsFromSuggestionAsync(List<Result> results, string
             if (_settings.EnableSuggestion)
             {
                 var suggestions = await SuggestionsAsync(keyword, subtitle, searchSource, token).ConfigureAwait(false);
-                if (token.IsCancellationRequested || !suggestions.Any())
+                var enumerable = suggestions?.ToList();
+                if (token.IsCancellationRequested || enumerable is not { Count: > 0 })
                     return;
-
-
-                results.AddRange(suggestions);
+                
+                results.AddRange(enumerable);
 
                 token.ThrowIfCancellationRequested();
             }
@@ -118,32 +117,31 @@ private async Task UpdateResultsFromSuggestionAsync(List<Result> results, string
         private async Task<IEnumerable<Result>> SuggestionsAsync(string keyword, string subtitle, SearchSource searchSource, CancellationToken token)
         {
             var source = _settings.SelectedSuggestion;
-            if (source != null)
+            if (source == null)
             {
-                //Suggestions appear below actual result, and appear above global action keyword match if non-global;
-                var score = searchSource.ActionKeyword == SearchSourceGlobalPluginWildCardSign ? scoreSuggestions : scoreSuggestions + 1;
+                return new List<Result>();
+            }
+            //Suggestions appear below actual result, and appear above global action keyword match if non-global;
+            var score = searchSource.ActionKeyword == SearchSourceGlobalPluginWildCardSign ? scoreSuggestions : scoreSuggestions + 1;
 
-                var suggestions = await source.Suggestions(keyword, token).ConfigureAwait(false);
+            var suggestions = await source.SuggestionsAsync(keyword, token).ConfigureAwait(false);
 
-                token.ThrowIfCancellationRequested();
+            token.ThrowIfCancellationRequested();
 
-                var resultsFromSuggestion = suggestions?.Select(o => new Result
+            var resultsFromSuggestion = suggestions?.Select(o => new Result
+            {
+                Title = o,
+                SubTitle = subtitle,
+                Score = score,
+                IcoPath = searchSource.IconPath,
+                Action = c =>
                 {
-                    Title = o,
-                    SubTitle = subtitle,
-                    Score = score,
-                    IcoPath = searchSource.IconPath,
-                    ActionKeywordAssigned = searchSource.ActionKeyword == SearchSourceGlobalPluginWildCardSign ? string.Empty : searchSource.ActionKeyword,
-                    Action = c =>
-                    {
-                        _context.API.OpenUrl(searchSource.Url.Replace("{q}", Uri.EscapeDataString(o)));
+                    _context.API.OpenUrl(searchSource.Url.Replace("{q}", Uri.EscapeDataString(o)));
 
-                        return true;
-                    }
-                });
-                return resultsFromSuggestion;
-            }
-            return new List<Result>();
+                    return true;
+                }
+            });
+            return resultsFromSuggestion;
         }
 
         public Task InitAsync(PluginInitContext context)
@@ -167,7 +165,9 @@ void Init()
                 // Custom images directory is in the WebSearch's data location folder 
                 var name = Path.GetFileNameWithoutExtension(_context.CurrentPluginMetadata.ExecuteFileName);
                 CustomImagesDirectory = Path.Combine(DataLocation.PluginSettingsDirectory, name, "CustomIcons");
-            };
+            }
+
+            ;
         }
 
         #region ISettingProvider Members
@@ -191,4 +191,4 @@ public string GetTranslatedPluginDescription()
 
         public event ResultUpdatedEventHandler ResultsUpdated;
     }
-}
+}

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

@@ -16,7 +16,7 @@ public class Baidu : SuggestionSource
     {
         private readonly Regex _reg = new Regex("window.baidu.sug\\((.*)\\)");
 
-        public override async Task<List<string>> Suggestions(string query, CancellationToken token)
+        public override async Task<List<string>> SuggestionsAsync(string query, CancellationToken token)
         {
             string result;
 
@@ -25,7 +25,7 @@ public override async Task<List<string>> Suggestions(string query, CancellationT
                 const string api = "http://suggestion.baidu.com/su?json=1&wd=";
                 result = await Http.GetAsync(api + Uri.EscapeUriString(query), token).ConfigureAwait(false);
             }
-            catch (Exception e) when (e is HttpRequestException || e.InnerException is TimeoutException)
+            catch (Exception e) when (e is HttpRequestException or {InnerException: TimeoutException})
             {
                 Log.Exception("|Baidu.Suggestions|Can't get suggestion from baidu", e);
                 return null;

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

@@ -15,7 +15,7 @@ namespace Flow.Launcher.Plugin.WebSearch.SuggestionSources
 {
     class Bing : SuggestionSource
     {
-        public override async Task<List<string>> Suggestions(string query, CancellationToken token)
+        public override async Task<List<string>> SuggestionsAsync(string query, CancellationToken token)
         {
 
             try
@@ -40,7 +40,7 @@ public override async Task<List<string>> Suggestions(string query, CancellationT
 
 
             }
-            catch (Exception e) when (e is HttpRequestException || e.InnerException is TimeoutException)
+            catch (Exception e) when (e is HttpRequestException or {InnerException: TimeoutException})
             {
                 Log.Exception("|Baidu.Suggestions|Can't get suggestion from baidu", e);
                 return null;

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

@@ -14,7 +14,7 @@ namespace Flow.Launcher.Plugin.WebSearch.SuggestionSources
 {
     public class Google : SuggestionSource
     {
-        public override async Task<List<string>> Suggestions(string query, CancellationToken token)
+        public override async Task<List<string>> SuggestionsAsync(string query, CancellationToken token)
         {
             try
             {
@@ -32,7 +32,7 @@ public override async Task<List<string>> Suggestions(string query, CancellationT
                 return results.EnumerateArray().Select(o => o.GetString()).ToList();
 
             }
-            catch (Exception e) when (e is HttpRequestException || e.InnerException is TimeoutException)
+            catch (Exception e) when (e is HttpRequestException or {InnerException: TimeoutException})
             {
                 Log.Exception("|Baidu.Suggestions|Can't get suggestion from baidu", e);
                 return null;

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

@@ -6,6 +6,6 @@ namespace Flow.Launcher.Plugin.WebSearch.SuggestionSources
 {
     public abstract class SuggestionSource
     {
-        public abstract Task<List<string>> Suggestions(string query, CancellationToken token);
+        public abstract Task<List<string>> SuggestionsAsync(string query, CancellationToken token);
     }
 }