diff --git a/MatrixUtils.RoomUpgradeCLI/Commands/ModifyCommand.cs b/MatrixUtils.RoomUpgradeCLI/Commands/ModifyCommand.cs
new file mode 100644
index 0000000..35c7bb1
--- /dev/null
+++ b/MatrixUtils.RoomUpgradeCLI/Commands/ModifyCommand.cs
@@ -0,0 +1,72 @@
+using System.Text.Json;
+using ArcaneLibs.Extensions;
+using LibMatrix.Helpers;
+using LibMatrix.Homeservers;
+using MatrixUtils.RoomUpgradeCLI.Extensions;
+
+namespace MatrixUtils.RoomUpgradeCLI.Commands;
+
+public class ModifyCommand(ILogger<ModifyCommand> logger, IHost host, RuntimeContext ctx, AuthenticatedHomeserverGeneric hs) : IHostedService {
+ public async Task StartAsync(CancellationToken cancellationToken) {
+ if (ctx.Args.Length <= 2 || ctx.Args.Contains("--help")) {
+ await PrintHelp();
+ return;
+ }
+
+ var filename = ctx.Args[1];
+ if (filename.StartsWith("--")) {
+ Console.WriteLine("Filename cannot start with --, please provide a valid filename.");
+ await PrintHelp();
+ }
+
+ var rb = ctx.Args.Contains("--upgrade")
+ ? await JsonSerializer.DeserializeAsync<RoomUpgradeBuilder>(File.OpenRead(filename), cancellationToken: cancellationToken)
+ : await JsonSerializer.DeserializeAsync<RoomBuilder>(File.OpenRead(filename), cancellationToken: cancellationToken);
+ await rb!.ApplyRoomUpgradeCLIArgs(hs, ctx.Args[2..], isNewState: false);
+ await File.WriteAllTextAsync(filename, rb.ToJson(), cancellationToken);
+
+ await host.StopAsync(cancellationToken);
+ }
+
+ public async Task StopAsync(CancellationToken cancellationToken) { }
+
+ private async Task PrintHelp() {
+ Console.WriteLine("Usage: new [filename] [options]");
+ Console.WriteLine("Options:");
+ Console.WriteLine(" --help Show this help message");
+ Console.WriteLine(" --version <version> Set the room version (e.g. 9, 10, 11, 12)");
+ Console.WriteLine("-- New room options --");
+ Console.WriteLine(" --alias <alias> Set the room alias (local part)");
+ Console.WriteLine(" --avatar-url <url> Set the room avatar URL");
+ Console.WriteLine(" --copy-avatar <roomId> Copy the avatar from an existing room");
+ Console.WriteLine(" --copy-powerlevels <roomId> Copy power levels from an existing room");
+ Console.WriteLine(" --invite-admin <userId> Invite a user as an admin (userId must start with '@')");
+ Console.WriteLine(" --invite <userId> Invite a user (userId must start with '@')");
+ Console.WriteLine(" --name <name> Set the room name (can be multiple words)");
+ Console.WriteLine(" --topic <topic> Set the room topic (can be multiple words)");
+ Console.WriteLine(" --federate <true|false> Set whether the room is federatable");
+ Console.WriteLine(" --public Set the room join rule to public");
+ Console.WriteLine(" --invite-only Set the room join rule to invite-only");
+ Console.WriteLine(" --knock Set the room join rule to knock");
+ Console.WriteLine(" --restricted Set the room join rule to restricted");
+ Console.WriteLine(" --knock_restricted Set the room join rule to knock_restricted");
+ Console.WriteLine(" --private Set the room join rule to private");
+ Console.WriteLine(" --join-rule <rule> Set the room join rule (public, invite, knock, restricted, knock_restricted, private)");
+ Console.WriteLine(" --history-visibility <visibility> Set the room history visibility (shared, invited, joined, world_readable)");
+ Console.WriteLine(" --type <type> Set the room type (e.g. m.space, m.room, support.feline.policy.list.msc.v1 etc.)");
+ // upgrade opts
+ Console.WriteLine("-- Upgrade options --");
+ Console.WriteLine(
+ " --upgrade <roomId> Create a room upgrade file instead of a new room file - WARNING: incompatible with non-upgrade options");
+ Console.WriteLine(" --invite-members Invite members during room upgrade");
+ Console.WriteLine(" --invite-powerlevel-users Invite users with power levels during room upgrade");
+ Console.WriteLine(" --migrate-bans Migrate bans during room upgrade");
+ Console.WriteLine(" --migrate-empty-state-events Migrate empty state events during room upgrade");
+ Console.WriteLine(" --upgrade-unstable-values Upgrade unstable values during room upgrade");
+ Console.WriteLine(" --msc4321-policy-list-upgrade <move|transition> Upgrade MSC4321 policy list");
+ Console.WriteLine(" --force-upgrade Force upgrade even if you don't have the required permissions");
+ Console.WriteLine(
+ "WARNING: The --upgrade option is incompatible with options listed under \"New room\", please use the equivalent options in the `modify` command instead.");
+ await host.StopAsync();
+ }
+}
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