add file content search to Index Search

Author: jjw24

Plugins/Flow.Launcher.Plugin.Explorer/Search/Constants.cs

@@ -25,5 +25,7 @@ internal static class Constants
         internal const char DirectorySeperator = '\\';
 
         internal const string WindowsIndexingOptions = "srchadmin.dll";
+
+        internal const string WindowsIndexFileContentSearchHotkey = "content:";
     }
 }

Plugins/Flow.Launcher.Plugin.Explorer/Search/SearchManager.cs

@@ -42,6 +42,9 @@ internal List<Result> Search(Query query)
             if (string.IsNullOrEmpty(querySearch))
                 return results;
 
+            if (IsFileContentSearch(querySearch))
+                return WindowsIndexFileContentSearch(query, querySearch);
+
             var isEnvironmentVariable = EnvironmentVariables.IsEnvironmentVariableSearch(querySearch);
 
             if (isEnvironmentVariable)
@@ -74,6 +77,30 @@ internal List<Result> Search(Query query)
             return results;
         }
 
+        private List<Result> WindowsIndexFileContentSearch(Query query, string querySearchString)
+        {
+            var queryConstructor = new QueryConstructor(settings);
+
+            var updatedQuerySearchString = querySearchString
+                                            .Substring(querySearchString
+                                                .IndexOf(Constants.WindowsIndexFileContentSearchHotkey) 
+                                                            + Constants.WindowsIndexFileContentSearchHotkey.Length);
+
+            if (string.IsNullOrEmpty(updatedQuerySearchString))
+                return new List<Result>();
+
+            return indexSearch.WindowsIndexSearch(updatedQuerySearchString.TrimStart(),
+                                                    queryConstructor.CreateQueryHelper().ConnectionString,
+                                                    queryConstructor.QueryForFileContentSearch,
+                                                    query);
+        }
+
+        public bool IsFileContentSearch(string querySearch)
+        {
+            return querySearch.StartsWith(Constants.WindowsIndexFileContentSearchHotkey, 
+                                            StringComparison.OrdinalIgnoreCase);
+        }
+
         private List<Result> DirectoryInfoClassSearch(Query query, string querySearch)
         {
             var directoryInfoSearch = new DirectoryInfoSearch(context);

Plugins/Flow.Launcher.Plugin.Explorer/Search/WindowsIndex/QueryConstructor.cs

@@ -117,5 +117,23 @@ public string QueryWhereRestrictionsForAllFilesAndFoldersSearch()
         {
             return $"scope='file:'";
         }
+
+        ///<summary>
+        /// Search will be performed on all indexed file contents for the specified search keywords.
+        ///</summary>
+        public string QueryForFileContentSearch(string userSearchString)
+        {
+            string query = "SELECT TOP " + settings.MaxResult + $" {CreateBaseQuery().QuerySelectColumns} FROM {SystemIndex} WHERE ";
+
+            return query + QueryWhereRestrictionsForFileContentSearch(userSearchString) + " AND " + QueryWhereRestrictionsForAllFilesAndFoldersSearch();
+        }
+
+        ///<summary>
+        /// Set the required WHERE clause restriction to search within file content.
+        ///</summary>
+        public string QueryWhereRestrictionsForFileContentSearch(string searchQuery)
+        {
+            return $"FREETEXT('{searchQuery}')";
+        }
     }
 }