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polylang-acf-relationship-flags.php
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polylang-acf-relationship-flags.php
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<?php
/*
Plugin Name: ACF + Polylang Relationship Flags
Plugin URI: https://github.com/certainlyakey
GitHub URI: https://github.com/certainlyakey
Description: Adds a tiny flag image corresponding to post/term language in ACF relationship and taxonomy fields.
Version: 0.1
Author: Aleksandr Beliaev
Author URI: https://aleksandrbeliaev.work
License: GPL v2 or later
Requires PHP 5.6 or later
*/
function aprf_polylang_display_language_code_for_object( $type = 'post', $id = null ) {
$output = '';
if (
// Polylang exists
function_exists( 'pll_get_post_language' ) &&
// ACF exists
function_exists( 'acf_get_setting' ) &&
is_array( pll_languages_list() ) &&
// There's more than one language active
count( pll_languages_list() ) > 1
) {
// language slug
$current_lang = '';
if ( $type === 'post' ) {
$current_lang = pll_get_post_language( $id );
$translations_ids = pll_get_post_translations( $id );
}
if ( $type === 'term' ) {
$current_lang = pll_get_term_language( $id );
$translations_ids = pll_get_term_translations( $id );
}
if ( $current_lang ) {
$lang_term = get_term_by( 'slug', $current_lang, 'language' );
$pll_lang = new PLL_Language($lang_term);
$pll_lang_description = maybe_unserialize($pll_lang->description);
$flags_path = file_exists( WP_PLUGIN_DIR . '/polylang-pro/' ) ? WP_PLUGIN_DIR . '/polylang-pro/vendor/wpsyntex/polylang/flags/' : WP_PLUGIN_DIR . '/polylang/flags/';
$flag_file = file_get_contents( $flags_path . $pll_lang_description['flag_code'] . '.png' );
if ( $translations_ids ) {
$translations = aprf_array_map_assoc( function( $lang, $translation_id ) use ( $type, $current_lang ) {
$translation = [ $lang => '' ];
if ( $lang !== $current_lang ) {
if ( $type === 'post' ) {
$translation = [ $lang => get_the_title( $translation_id ) ];
}
if ( $type === 'term' ) {
$term = get_term( $translation_id );
$translation = [ $lang => $term->name ];
}
}
return $translation;
}, $translations_ids);
$translations_strings = array_map( function( $translation_title, $lang ) {
$translation_string = '';
if (!empty( $translation_title )) {
$translation_string = $translation_title .' (' . $lang . ')';
}
return $translation_string;
}, array_values( $translations ), array_keys( $translations ) );
// remove empty titles
$translations_strings = array_values( array_diff( $translations_strings, array( 'null', '' ) ) );
$flag_title_attr = '';
if (!empty( $translations_strings )) {
$flag_title_attr = ' title="' . __( 'Other translations: ','aprf' ) . implode( $translations_strings, '; ' ) . '"';
}
}
if ( $flag_file ) {
$output .= ' <img style="margin-left: 2px" alt="' . __( 'Flag', 'aprf' ) . '"' . $flag_title_attr . ' src="' . 'data:image/png;base64,' . base64_encode( $flag_file ) . '">';
} else {
$output .= ' (' . $slug . ')';
}
}
}
return $output;
}
function aprf_array_map_assoc(callable $f, array $a) {
return array_merge(...array_map($f, array_keys($a), $a));
}
// Append edit post link to relationship fields in admin
function aprf_update_relationship_field_admin( $title, $post, $field, $post_id ) {
if (
function_exists( 'pll_is_translated_post_type' ) &&
pll_is_translated_post_type( $post->post_type )
) {
$title .= aprf_polylang_display_language_code_for_object( 'post', $post->ID );
}
// only show the edit link to admins
if ( current_user_can( 'create_users' ) ) {
$title .= sprintf('<a style="margin-left:4px; opacity:.7; font-size:11px; text-decoration:none; color:currentColor" href="%s" target="_blank">(%s)</a>', get_edit_post_link( $post->ID ), __( 'edit', 'aprf' ) );
}
return $title;
}
add_filter('acf/fields/relationship/result', 'aprf_update_relationship_field_admin', 10, 4);
// Append flag to post_object fields in admin
function aprf_update_postobject_field_admin( $title, $post, $field, $post_id ) {
if (
function_exists( 'pll_is_translated_post_type' ) &&
pll_is_translated_post_type( $post->post_type )
) {
$title .= aprf_polylang_display_language_code_for_object( 'post', $post->ID );
}
return $title;
}
add_filter('acf/fields/post_object/result', 'aprf_update_postobject_field_admin', 10, 4);
// Append Polylang language code to taxonomy field entries in admin
function aprf_append_language_code_to_taxonomy_field_admin( $args, $field ) {
if (
function_exists( 'pll_is_translated_taxonomy' ) &&
pll_is_translated_taxonomy( $args['taxonomy'] )
) {
$args['walker'] = new aprf_acf_taxonomy_field_walker( $field );
}
return $args;
}
add_filter('acf/fields/taxonomy/wp_list_categories', 'aprf_append_language_code_to_taxonomy_field_admin', 10, 2);
/*
* acf_taxonomy_field_walker class from acf/core/fields/taxonomy.php
* @see https://github.com/elliotcondon/acf/blob/befc63020abba7d0bce27fa2bc67fec0f999b13d/core/fields/taxonomy.php
* a small change to add Polylang current language to the rendered labels
* This file should not be formatted/beautified, to allow for easier review and integration of possible future changes in this class by the plugin author
*/
class aprf_acf_taxonomy_field_walker extends Walker
{
// vars
var $field = null,
$tree_type = 'category',
$db_fields = array ( 'parent' => 'parent', 'id' => 'term_id' );
// construct
function __construct( $field )
{
$this->field = $field;
}
// start_el
function start_el( &$output, $term, $depth = 0, $args = array(), $current_object_id = 0)
{
$selected = in_array( $term->term_id, $this->field['value'] );
if( $this->field['field_type'] == 'checkbox' )
{
$output .= '<li><label class="selectit"><input type="checkbox" name="' . $this->field['name'] . '" value="' . $term->term_id . '" ' . ($selected ? 'checked="checked"' : '') . ' /> ' . $term->name;
$output .= aprf_polylang_display_language_code_for_object( 'term', $term->term_id );
$output .= '</label>';
}
elseif( $this->field['field_type'] == 'radio' )
{
$output .= '<li><label class="selectit"><input type="radio" name="' . $this->field['name'] . '" value="' . $term->term_id . '" ' . ($selected ? 'checked="checkbox"' : '') . ' /> ' . $term->name;
$output .= aprf_polylang_display_language_code_for_object( 'term', $term->term_id );
$output .= '</label>';
}
elseif( $this->field['field_type'] == 'select' )
{
$indent = str_repeat("— ", $depth);
$output .= '<option value="' . $term->term_id . '" ' . ($selected ? 'selected="selected"' : '') . '>' . $indent . $term->name;
$output .= aprf_polylang_display_language_code_for_object( 'term', $term->term_id );
$output .= '</option>';
}
}
//end_el
function end_el( &$output, $term, $depth = 0, $args = array() )
{
if( in_array($this->field['field_type'], array('checkbox', 'radio')) )
{
$output .= '</li>';
}
$output .= "\n";
}
// start_lvl
function start_lvl( &$output, $depth = 0, $args = array() )
{
// indent
//$output .= str_repeat( "\t", $depth);
// wrap element
if( in_array($this->field['field_type'], array('checkbox', 'radio')) )
{
$output .= '<ul class="children">' . "\n";
}
}
// end_lvl
function end_lvl( &$output, $depth = 0, $args = array() )
{
// indent
//$output .= str_repeat( "\t", $depth);
// wrap element
if( in_array($this->field['field_type'], array('checkbox', 'radio')) )
{
$output .= '</ul>' . "\n";
}
}
}