subcommand restructure and bashstyle refactor. closes #1579

plugins/domains/subcommands/default

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
+source "$PLUGIN_AVAILABLE_PATH/domains/functions"
+
+domains_main_cmd() {
+  local desc="print app domains"
+  local cmd="domains"
+  local APP="$2"
+
+  if [[ "$(is_global_vhost_enabled)" == "true" ]]; then
+    dokku_log_info2_quiet "Global Domain Name"
+    get_global_vhost
+  fi
+  if [[ -n "$APP" ]]; then
+    verify_app_name "$APP"
+    if [[ -f "$DOKKU_ROOT/$APP/VHOST" ]]; then
+      dokku_log_info2_quiet "$APP Domain Names"
+      get_app_domains "$APP"
+    else
+      dokku_log_fail "No domain names set for $APP"
+    fi
+  fi
+}
+
+domains_main_cmd "$@"