Zalomení - Kybernaut

Zalomení takes care of Czech typography for you. In post content, headings, comments and widgets, it replaces regular spaces with non-breaking ones wherever a line must not break, so your editors don’t have to type them by hand. It also works with Advanced Custom Fields text fields, and you can adjust the lists of prepositions and abbreviations, for example for Slovak.

What it does

Prepositions: the one-letter prepositions k, s, v, z never stay at the end of a line.
Conjunctions: the same goes for a, i, o, u.
Abbreviations: common abbreviations such as např., tj. or tzv.
Numbers and units: 5 kg or 10 Kč stay together.
Number formatting: phone numbers such as 800 123 456 don’t get split.
Ordinals and dates: 1. ledna stays on one line.
Scales and ratios: 1 : 50 000 fits on one line.
Custom phrases: add multi-word phrases that must never break.

Settings

You’ll find everything in Settings → Reading. Developers can add or remove the hooks Zalomení applies to with the zalomeni_filtry filter. The rules of Czech typography are described in detail by the Czech Language Institute.

I took the plugin over in 2026 and gave it a full security audit. It was originally written by Honza Skýpala, thank you for the work.

Get involved

The plugin is free and open source. Reporting a bug, suggesting an improvement or leaving a review helps it most.

Do you need customisation?

Modifications that will enhance the plugin development and help other users I offer for “adoption”. You pay half the development cost and I’ll deliver the other half for free.

If the modifications are only of limited use, are only for your usage, or do not match my idea of the plugin’s direction, they are charged at full price.

Give me a call or shoot me an e-mail

Changelog

2.2.0 (2026-10-16)

New: Bricks Builder support – non-breaking spaces are added to the HTML Bricks renders for headers, content, footers and popups (requires WordPress 6.7+; contributed by @arteagacz)
Only visible text is changed; attributes, scripts, styles, SVG/MathML and tags from no_texturize_tags are left alone, and the Bricks editor is skipped
Remove bricks/frontend/render_data through the zalomeni_filtry filter to turn Bricks support off

Older versions (20)

2.1.0 (2026-09-25)

New: fields of Advanced Custom Fields are handled too – wysiwyg fields through acf_the_content, text and textarea fields through acf/format_value
New: zalomeni_acf_filtry filter to change the list of ACF filters the plugin hooks
Text and textarea fields get the non-breaking space character instead of the   entity, so it survives escaping in the theme

2.0.1 (2026-08-14)

Fix: no longer inserts a non-breaking space after an apostrophe entity, so English possessives like “America’s Response” are left alone (reported by Juraj Kopčan)
Fix: prepositions at the very start of a paragraph now get a non-breaking space (the leading-boundary anchor never matched)

2.0.0 (2026-05-06)

New maintainer: Karolína Vyskočilová (vyskoczilova)
Security: added sanitize callbacks to all register_setting calls
Security: escaped regex metacharacters in user-defined option lists (preg_quote)
Security: added preg_replace error handling to prevent null output
Security: filtered empty list items to prevent catch-all regex patterns
Security: escaped custom terms to prevent regex injection while preserving \d, \w, \s
Security: added output escaping (esc_attr, esc_js, esc_textarea) in admin settings
Security: replaced dynamic constant() calls with static lookup array
Security: inlined WP-private _wptexturize_pushpop_element function
Security: added direct file access guard
Improvement: added uninstall.php for clean option removal
Improvement: license changed from WTFPL to GPL-2.0-or-later
Improvement: all admin strings are now translatable via wp i18n make-pot
Improvement: lazy-load plugin.php only on admin pages
Improvement: guarded pre-1.3 migration against missing options
Improvement: strict comparisons and PHP 8+ compatibility throughout
Improvement: updated minimum requirements to WordPress 6.0 and PHP 7.0

1.5

bug fix: PHP 8+ compatibility

1.4.7

bug fix: fixed strict standards notices in the plugin settings

1.4.6

bug fix: the plugin detected and processed empty strings as HTML tags, which raised a PHP notice when logging was on; fixed

1.4.5

bug fix: keeping a number and its unit together did not work at the end of a line, or when a closing parenthesis followed

1.4.4

bug fix

1.4.3

Handles the case where, for some reason, the settings are missing from the database: the default settings are now used. (Users saw this as a settings page without any labels that could not be saved, and the plug-in did not work.)

1.4.2

Improved UTF-8 compatibility (thanks to Pavel Krejčí)

1.4.1

Checks for PHP 5.3 or higher when the plugin is activated
Minor optimizations

1.4

The non-breaking space after an ordinal number now also accepts a number as the following word, so a date written as 1. 1. 2014 no longer breaks across lines
New feature: prevents a line break between a number and a unit or currency (e.g. 1 m, 5 kg, 50 Kč)
New feature: prevents a line break in scales and ratios (e.g. 1 : 1000)
Custom filter zalomeni_filtry – lets you remove or add the filters Zalomení is applied to
Minor optimizations

1.3

License change
Settings are stored differently (internal; previously an array of variables, now each variable on its own, which will hopefully fix the problems some users had with saving the settings)
New feature: prevents a line break after an ordinal number (including dates, e.g. “1. ledna”, 1 January)
New feature: user-defined terms that must not be broken across lines
Screenshots moved to the assets directory, so they are no longer needlessly downloaded into users’ WordPress installations
Plug-in rewritten as a PHP class, for better isolation and readability
WordPress no longer calls the activation hook when the plugin is updated to a new version; the update is now checked and run in admin_init()

1.2.4

The replacement function is now called twice: before, the plugin did not work for two matching words in a row (e.g. with non-breaking spaces after both prepositions and conjunctions turned on, in the phrase “a s někým” the space after “a” was replaced, but not the one after “s”)
Plugin settings moved to the Settings->Reading page; the plugin does not need a whole settings page of its own

1.2.3

Fixed the add_options_page call so that it no longer uses an unsupported format.

1.2.2

Fixed an error in the configuration.

1.2.1

Fixed an error in the HTML of the plugin configuration.

1.2

Compatibility with WordPress 2.9

1.1

Can now also insert a non-breaking space after a preposition (or another word) in these positions: the first word after an opening parenthesis, the first word after a tag (e.g. a tag that turns on italics or bold), at the start of a paragraph.
Extended the default list of abbreviations followed by a non-breaking space
Replaces spaces in numbers with non-breaking spaces (e.g. in a phone number written as 800 123 456, so the number is not split by a line break).
Rewritten internally: no longer uses the existing wptexturize() filter, adds its own filter instead.

1.0

Initial release.