[MM-46468] Change /help and add /marketplace (#20850)

app/slashcommands/command_help.go

@@ -41,5 +41,10 @@ func (h *HelpProvider) DoCommand(a *app.App, c request.CTX, args *model.CommandA
 		helpLink = model.SupportSettingsDefaultHelpLink
 	}
 
-	return &model.CommandResponse{GotoLocation: helpLink}
+	return &model.CommandResponse{
+		ResponseType: model.CommandResponseTypeEphemeral,
+		Text: args.T("api.command_help.success", map[string]any{
+			"HelpLink": helpLink,
+		}),
+	}
 }

app/slashcommands/command_marketplace.go

@@ -0,0 +1,43 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package slashcommands
+
+import (
+	"github.com/mattermost/mattermost-server/v6/app"
+	"github.com/mattermost/mattermost-server/v6/app/request"
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/shared/i18n"
+)
+
+type MarketplaceProvider struct {
+}
+
+const (
+	CmdMarketplace = "marketplace"
+)
+
+func init() {
+	app.RegisterCommandProvider(&MarketplaceProvider{})
+}
+
+func (h *MarketplaceProvider) GetTrigger() string {
+	return CmdMarketplace
+}
+
+func (h *MarketplaceProvider) GetCommand(a *app.App, T i18n.TranslateFunc) *model.Command {
+	return &model.Command{
+		Trigger:          CmdMarketplace,
+		AutoComplete:     true,
+		AutoCompleteDesc: T("api.command_marketplace.desc"),
+		DisplayName:      T("api.command_marketplace.name"),
+	}
+}
+
+func (h *MarketplaceProvider) DoCommand(a *app.App, c request.CTX, args *model.CommandArgs, message string) *model.CommandResponse {
+	// This command is handled client-side and shouldn't hit the server.
+	return &model.CommandResponse{
+		Text:         args.T("api.command_marketplace.unsupported.app_error"),
+		ResponseType: model.CommandResponseTypeEphemeral,
+	}
+}