quasiDigi

This list has been updated for Big Sur (and later). Since I don't use these versions, this guide might still need further improvements. For older macOS versions, please see this older revision.

Open in Sublime Text

• Open Automator
• Quick Action
• Set “Service receives selected” to files or folders in any application
• Add a Run Shell Script action
• Set the script action to /Applications/Sublime\ Text.app/Contents/SharedSupport/bin/subl -n "$@"
• Set “Pass input” to as arguments

quasiDigi

<?php

function getId($page) { return $page->ID; }  

$ancestors = get_post_ancestors( $post->ID );
$parent = ($ancestors) ? $ancestors[0] : null;

if ($parent) :
   $siblingIds = array_map( "getId", get_pages('child_of='. $parent .'&sort_column=menu_order&sort_order=asc') );