Implement domains:reset

plugins/domains/help-functions

@@ -36,6 +36,7 @@ fn-help-content() {
     domains:remove <app> <domain> [<domain> ...], Remove domains from app
     domains:remove-global <domain> [<domain> ...], Remove global domain names
     domains:report [<app>|--global] [<flag>], Displays a domains report for one or more apps
+    domains:reset <app>, Reset app domains to global-configured domains
     domains:set <app> <domain> [<domain> ...], Set domains for app
     domains:set-global <domain> [<domain> ...], Set global domain names
 help_content

plugins/domains/subcommands/reset

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
+source "$PLUGIN_AVAILABLE_PATH/domains/functions"
+
+cmd-domains-reset() {
+  declare desc="reset app domains to global-configured domains"
+  declare cmd="domains:reset"
+  [[ "$1" == "$cmd" ]] && shift 1
+  declare APP="$1"
+
+  verify_app_name "$APP"
+  local APP_VHOST_PATH="$DOKKU_ROOT/$APP/VHOST"
+
+  rm -f "$APP_VHOST_PATH"
+  domains_setup "$APP"
+  plugn trigger post-domains-update "$APP" "reset"
+  dokku_log_info1 "Reset domains for $APP"
+}
+
+cmd-domains-reset "$@"