Initial commit

Author: Joseph Fusco

README.md

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+# WP Theme Lock
+
+An mu-plugin that forces a WordPress theme to always be active. Intended for a [Headless WordPress](https://www.gatsbyjs.com/docs/glossary/headless-wordpress/) setup.
+
+## Config
+
+Out of the box, this mu-plugin expects [wp-headless-theme](https://github.com/masonitedoors/wp-headless-theme) to be installed.
+
+You can set your own theme using the available filter in a separate mu-plugin.
+
+```php
+add_filter( 'wp_theme_lock', function() {
+  return 'twentytwenty'; // Theme directory to lock.
+});
+```

composer.json

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+{
+  "name": "masonitedoors/wp-theme-lock",
+  "description": "An mu-plugin that forces a WordPress theme to always be active. Requires https://github.com/masonitedoors/wp-headless-theme.",
+  "type": "wordpress-muplugin",
+  "license": "MIT",
+  "authors": [
+    {
+      "name": "Joseph Fusco",
+      "homepage": "https://github.com/josephfusco",
+      "role": "Developer"
+    }
+  ],
+  "require": {
+    "php": ">=7"
+  }
+}

wp-theme-lock.php

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+<?php
+/**
+ * Plugin Name:  WP Force Theme
+ * Plugin URI:   https://github.com/masonitedoors/wp-force-theme/
+ * Description:  Forces WordPress to always load the wp-headless-theme.
+ * Version:      1.0.0
+ * Author:       Masonite
+ * Author URI:   https://www.masonite.com/
+ * License:      MIT License
+ */
+
+add_action(
+	'setup_theme',
+	function() {
+		$theme_directory_name = apply_filters( 'wp_force_theme', 'wp-headless-theme' );
+
+		/**
+		 * Filters the name of the current theme.
+		 */
+		add_filter( 'template', function() use ( $theme_directory_name ) {
+			return $theme_directory_name;
+		});
+
+		/**
+		 * Filters the name of current stylesheet.
+		 */
+		add_filter( 'stylesheet', function() use ( $theme_directory_name )  {
+			return $theme_directory_name;
+		});
+	},
+	-1
+);