File lib/core/template.php

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<?php

/**
 * Add page type class name as a css class on body.
 *
 * @param  array $classes
 *
 * @return array
 */
function papi_body_class( array $classes ) {
    $class = papi_get_entry_type_css_class();

    if ( empty( $class ) ) {
        return $classes;
    }

    $classes[] = $class;

    return $classes;
}

add_filter( 'body_class', 'papi_body_class' );

/**
 * Get template file name.
 *
 * @param  string $template
 *
 * @return string|null
 */
function papi_get_template_file_name( $template ) {
    if ( ! is_string( $template ) ) {
        return;
    }

    $extension = '.php';
    $ext_reg   = '/(' . $extension . ')+$/';

    if ( preg_match( '/\.\w+$/', $template, $matches ) && preg_match( $ext_reg, $matches[0] ) ) {
        return str_replace( '.', '/', preg_replace( '/' . $matches[0] . '$/', '', $template ) ) . $matches[0];
    }

    $template = str_replace( '.', '/', $template );
    $template = substr( $template, -strlen( $extension ) ) === $extension ? $template : $template . $extension;

    return $template === $extension ? null : $template;
}

/**
 * Include partial view.
 *
 * @param string $file
 * @param array $vars
 */
function papi_include_template( $file, array $vars = [] ) {
    if ( ! is_string( $file ) || empty( $file ) ) {
        return;
    }

    $path = PAPI_PLUGIN_DIR;
    $path = rtrim( $path, '/' ) . '/';

    if ( file_exists( $path . $file ) ) {
        require $path . $file;
    }
}

/**
 * Load a template array file and merge values with it.
 *
 * @param  string $file
 * @param  array  $values
 * @param  bool   $convert_to_object
 *
 * @return array
 */
function papi_template( $file, array $values = [], $convert_to_object = false ) {
    if ( ! is_string( $file ) || empty( $file ) ) {
        return [];
    }

    $filepath = papi_get_file_path( $file );

    if ( empty( $filepath ) && is_file( $file ) ) {
        $filepath = $file;
    }

    if ( empty( $filepath ) || ! file_exists( $filepath ) || is_dir( $filepath ) ) {
        return [];
    }

    $template = require $filepath;

    if ( papi_is_property( $template ) ) {
        foreach ( $values as $key => $value ) {
            $template->set_option( $key, $value );
        }

        $result = $template;
    } else {
        $result = array_merge( (array) $template, $values );
    }

    if ( $convert_to_object ) {
        return (object) $result;
    }

    return $result;
}

/**
 * Include template files from Papis custom page template meta field.
 *
 * @param  string $original_template
 *
 * @return string
 */
function papi_template_include( $original_template ) {
    global $post;

    // Check so we only change template on single and page posts.
    if ( ! is_single() && ! is_page() && ! is_tag() ) {
        return $original_template;
    }

    // Determine which id to use.
    $id = is_tag() ? get_queried_object()->term_id : $post->ID;

    // Only load a template if it exists.
    if ( $page_template = papi_get_entry_type_template( $id ) ) {
        if ( $template = locate_template( $page_template ) ) {
            /**
             * Change which template that is used by Papi.
             *
             * @param  string $template
             *
             * @return string
             */
            return apply_filters( 'papi/template_include', $template );
        }
    }

    return $original_template;
}

add_filter( 'template_include', 'papi_template_include' );

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