Add global header block

blocks/global-header/README.md

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+# Global Header
+
+## Register as a block (for Full Site Editing themes)
+
+Add as a composer dependency, install, then
+
+```php
+add_action( 'muplugins_loaded', function() {
+	require_once REPO_TOOLS_DIR . '/block.php';
+} );
+```
+
+
+## Include directly in PHP (for classic themes)
+
+Add as a composer dependency, install, then
+
+require_once 'vendor/wporg-repo-tools/blocks/global-header/header.php';
+
+
+## Embed as an iframe (for Trac, Codex, etc)
+

blocks/global-header/block.php

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+<?php
+
+namespace WordPress_org\Repo_Tools\Global_Header;
+
+defined( 'WPINC' ) || die();
+
+add_action( 'init', __NAMESPACE__ . '\register_assets', 9 );
+
+function register_assets() {
+	register_block_type(
+		'wordpress-org/global-header',
+		array( 'render_callback' => __NAMESPACE__ . '\render_global_header' )
+	);
+}
+
+function render_global_header( $attributes ) {
+	ob_start();
+	require_once __DIR__ . '/header.php';
+	return ob_get_clean();
+}
+

blocks/global-header/header.php

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+<?php
+echo 'this is the global header :)';