Feature: Update filter

I am trying to filter the content to add a direct edit link to users who can edit the text block (similar to how tablepress does it) but there isn’t a proper hook that includes the id.

I updated your function to include an updated filter so it would now be possible. It would be awesome if you added it to the core.

// SHOW TEXT BLOCK
function show_text_block($id, $plain = false)
{
	// IF ID IS NOT NUMERIC CHECK FOR SLUG
	if(!is_numeric($id))
	{
		$page = get_page_by_path( $id, null, 'text-blocks' );
		$id = $page->ID;
	}

	if( !$id ) return false;

	if($plain)
	{
		return apply_filters( 'text_blocks_shortcode_html', get_post_field('post_content', $id), $id);
	}

	$content = apply_filters( 'the_content', get_post_field('post_content', $id) );
	return apply_filters( 'text_blocks_shortcode_html', $content, $id);
}

https://wordpress.org/plugins/reusable-text-blocks/