set default domain name

manifest.json

@@ -38,7 +38,8 @@
 					"en": "If your synapse domain is a subdomain, you can choose a name for your Synapse server to have your matrix user-ids looking like @user:domain.org instead of @user:synapse.domain.org",
 					"fr": "Si votre domaine pour synapse est un sous-domaine, vous pouvez choisir un nom pour votre serveur Synapse afin que vos identifiants matrix soient @utilisateur:domain.org plutôt que @utilisateur:synapse.domain.org"
 				},
-				"example": "domain.org"
+				"example": "domain.org",
+				"default": "Same than the domain"
 			},
 			{
 				"name": "is_public",

scripts/install

@@ -32,7 +32,11 @@ report_stats="False"
 #=================================================
 
 domain=$YNH_APP_ARG_DOMAIN
+if [ $server_name == "Same than the domain" ]; then
+    server_name=$domain
+else
     server_name=$YNH_APP_ARG_SERVER_NAME
+fi
 is_public=$YNH_APP_ARG_IS_PUBLIC
 path_url="/_matrix"
 final_path="/opt/yunohost/matrix-$app"

scripts/upgrade

@@ -32,10 +32,6 @@ upstream_version=$(ynh_app_upstream_version)
 
 domain=$(ynh_app_setting_get $app special_domain)
 server_name=$(ynh_app_setting_get $app server_name)
-if [ -z $server_name ]; then     # for retro compatibility
-   server_name=$domain
-   ynh_app_setting_set $app server_name  $domain
-fi
 path_url=$(ynh_app_setting_get $app special_path)
 final_path=$(ynh_app_setting_get $app final_path)
 synapse_old_version=$(ynh_app_setting_get $app synapse_version)
@@ -61,6 +57,10 @@ then
 	ynh_die "Update from this synapse version is not available. You need to remove this package and reinstall the new package version."
 fi
 
+if [ -z $server_name ]; then
+   server_name=$domain
+   ynh_app_setting_set $app server_name  $domain
+fi
 #=================================================
 # BACKUP BEFORE UPGRADE
 #=================================================