Stop redundantly downloading media when re-exporting (#395)

DiscordChatExporter.Cli/Commands/Base/ExportCommandBase.cs

@@ -29,6 +29,9 @@ namespace DiscordChatExporter.Cli.Commands.Base
         [CommandOption("media", Description = "Download referenced media content.")]
         public bool ShouldDownloadMedia { get; set; }
 
+        [CommandOption("reuse-media", Description = "If the media folder already exists, reuse media inside it to skip downloads.")]
+        public bool ShouldReuseMedia { get; set; }
+
         [CommandOption("dateformat", Description = "Date format used in output.")]
         public string DateFormat { get; set; } = "dd-MMM-yy hh:mm tt";
 
@@ -48,6 +51,7 @@ namespace DiscordChatExporter.Cli.Commands.Base
                 Before,
                 PartitionLimit,
                 ShouldDownloadMedia,
+                ShouldReuseMedia,
                 DateFormat
             );
 

DiscordChatExporter.Cli/Commands/Base/ExportMultipleCommandBase.cs

@@ -48,6 +48,7 @@ namespace DiscordChatExporter.Cli.Commands.Base
                         Before,
                         PartitionLimit,
                         ShouldDownloadMedia,
+                        ShouldReuseMedia,
                         DateFormat
                     );