Category: TIL

Check if a bash argument is set in a script

File varcheck.sh

#!/usr/bin/env bash

if [[ ! -z ${1+x} ]]; then
    echo "var is set to '$1'";
else
    echo "var is unset";
fi

varcheck.sh will output: var is unset
Running varcheck.sh TADA will output: var is set to 'TADA'

The shebang is the first line of a script so a shell knows what program to run it agianst
There are a lot of formats for the shebang for bash scripts. The best one is:

#!/usr/bin/env bash

source: https://stackoverflow.com/a/10383546/933065

I’m a big fan of xdebug I’ve been using it for years to dig into scripts.
But I’ve only used it on websites. And as I’m dipping my toes into wp-cli the need for command line debugging is increasing.

Like often Jetbrains has a good guide to set it up: “Working with Remote PHP Interpreters in PhpStorm”

For those interested in xdebug and PhpStorm start here.

Yesterday I joined the WPmeetup Zwolle.
The topic; translations

Translations are not new to me, but I did learn a few things.

• Extra comments can be given using this format /* translators:extra explaining comment */
  This does not work in poedt 🙁
• How to use translate.wordpress.org
• and that it runs on the plugin GlotPress

<?php
for ( $i=0; $i <= 5; $i++ ) {
    echo "for $i <br/>n";
}

echo "done $i <br/>n";

What will $i be, when the loop is done?

It will be 6 not 5.
Can be useful if you need to skip the last item in a (numbered) array

During WordCamp Rotterdam I worked on a small bug in WP-CLI. A bug I found roughly six months ago.
The bug itself was a one line fix.
I was asked to create functional tests using behat which I didn’t even heard off before.

So after checking the handbook and with help of a few others. It resulted in this pull request.
And now we wait.

Update: It was released as part of wp-cli-2.0.0

Users are global in a multisite. And default ACF groups are per site. So if you set a pinterest url for a user on one site it will apply it for all sites. No problem. But if you set an image it will try to find that image-id on each site.

The solution.

Step 1; Limit the user acf groups only to the main site:

<?php
function wpstarter_filter_fields_group($result, $rule, $screen) {
    if ( isset( $screen['user_id'] ) && ! is_main_site() )
        return false;

    return $result;
}
add_filter('acf/location/rule_match', 'wpstarter_filter_fields_group', 10, 3);

Step 2; Get image fields for users only from the main site:

<?php
function wpstarter_load_avatar_value_cros_site( $value, $post_id, $field ) {

    if( 0 !== strpos( $post_id, 'user_' ) || is_main_site() ) {
        return $value;
    }

    switch_to_blog( get_main_site_id() );

    $value_of_main_site = acf_get_value($post_id, $field);
    $value              = acf_format_value($value_of_main_site, $post_id, $field);

    restore_current_blog();
    return $value;
}
add_filter( 'acf/format_value/type=image', 'wpstarter_load_avatar_value_cros_site', 11, 3);

Consider this dummy snippet:

<?php
if ( true === $skip || heavy_check() ){
    continue;
}

The $skip is checked first. It is very quick as it is just a simple variable check. and since this is an ‘or’ statement. As soon as $skip is true it won’t bother with the heavy_check.

Something I always suspected but today I tested this and confirmed it.

So I needed some metadata to be in the rest API of a custom post_type.
The following adds the subtitle to the book post_type

<?php
add_action('rest_api_init', function () {
    register_rest_field('book', 'subtitle', [
        'get_callback'    => 'get_meta_data_for_rest',
        'update_callback' => null,
        'schema'          => null,
    ]);

});

function get_meta_data_for_rest($post, $field_name, $request)
{
    // it's not always an object
    if (isset($post->id) && ! empty($post->id)) {
        $post_id = $post->id;
    } elseif (isset($post['id']) && ! empty($post['id'])) {
        $post_id = $post['id'];
    } else {
        return null;
    }

    return get_post_meta($post_id, $field_name, true);
}

The code below will find and delete all empty terms of every taxonomie, including the menu.
Think before you delete, you might want to keep some empty categories.

<?php
foreach ( get_taxonomies() as $tax_slug ) {
    $terms = get_terms( $tax_slug, array( 'hide_empty' => false ) );

    /** @var WP_Term $wp_term */
    foreach ( $terms as $wp_term ) {
        if ( 0 == $wp_term->count ) {
            wp_delete_term( $wp_term->term_id, $wp_term->taxonomy );
        }
    }
}