Add forking ability

[actual-saurabh]

Add a button that simply copies the whole micros folder into a new folder with the exact same files. The new folder gets a new suffixed name (-1,-2, etc).

We will later add a way for the user to give a custom name (and therefore, a custom folder name) to the forked micro.

Much later, we'll add the ability to Publish this micro to the feed (and from there to Gists).

[actual-saurabh]

remove_action( 'wp_ajax_edit-theme-plugin-file', 'wp_ajax_edit_theme_plugin_file' );
add_action('wp_ajax_edit-theme-plugin-file', 'wp_ajax_edit_theme_plugin_micro_file' );

wp_ajax_edit_theme_plugin_micro_file will be very similar to wp_ajax_edit_theme_plugin_file

function wp_ajax_edit_theme_plugin_file() {
    $r = wp_edit_theme_plugin_file( wp_unslash( $_POST ) ); // Validation of args is done in wp_edit_theme_plugin_file().
    if ( is_wp_error( $r ) ) {
        wp_send_json_error(
            array_merge(
                array(
                    'code'    => $r->get_error_code(),
                    'message' => $r->get_error_message(),
                ),
                (array) $r->get_error_data()
            )
        );
    } else {
        wp_send_json_success(
            array(
                'message' => __( 'File edited successfully.' ),
            )
        );
    }
}

Our function should

function wp_ajax_edit_theme_plugin_micro_file() {
    $r = wp_edit_theme_plugin_micro_file( wp_unslash( $_POST ) ); // Validation of args is done in wp_edit_theme_plugin_file().
    if ( is_wp_error( $r ) ) {
        wp_send_json_error(
            array_merge(
                array(
                    'code'    => $r->get_error_code(),
                    'message' => $r->get_error_message(),
                ),
                (array) $r->get_error_data()
            )
        );
    } else {
        wp_send_json_success(
            array(
                'message' => __( 'File edited successfully.' ),
            )
        );
    }
}

[actual-saurabh]

Our custom function wp_edit_theme_plugin_micro_file is a wrapper for wp_edit_theme_plugin_file

https://github.com/WordPress/WordPress/blob/56c162fbc9867f923862f64f1b4570d885f1ff03/wp-admin/includes/file.php#L331-L608

function wp_edit_theme_plugin_micro_file( $args ){
    if ( empty( $args['micros'] ) ) {
        return wp_edit_theme_plugin_file( $args );
    }
    // do micro related stuff which is basically the same code as "wp_edit_theme_plugin_file" stripped off the plugin/theme specific stuff
}