Kirby Field Composer

Kirby Field Composer is a plugin that simplifies complex field operations in Kirby. It provides methods for merging fields, applying conditional logic, and manipulating strings, handling field values intelligently to avoid unwanted formatting issues. This makes it easier to work with both simple and complex content structures.

Features

🧪 Field Methods: A collection of methods to manipulate and compose field values.
🌐 Global Helper Functions: field() and f() for easy field composition.
🧬 Flexible Merging: Combining multiple fields with custom separators and positioning.
🏷️ Smart Handling of Empty Fields: No separators get inserted when fields are empty.
🚦 Conditional Field Handling: Apply conditions to field rendering.
🔡 String Manipulation: Apply Kirby's Str class methods directly to fields.

Overview

Simple use cases include merging multiple fields to a single field’s value …

$page->title()->merge($page->author(), $page->year());
// => Chasing Starlight, Jane Doe, 2008

… conditionally prefixing fields with certain values …

$page->publisher()->prefix('Publisher: ');
// => Publisher: Kirby Press

… or many more. But to understand how the plugin can become really useful, it’s helpful to look at a complex example: Let’s say on our website we have to display digital museum labels for a collection of paintings. We might need to compose a string after a schema like this:

{Artist Name}, {Year of Birth}-{Year of Death}, {Birth Place}; {Title of the Artwork}, {Year of Creation}; {Material} ({Width} × {Height} cm); {Collection}; {Description}

At first this might seem straight forward, but it can quickly become complex when you get into the specifics: there are sub-groups separated by semi-colons, while the sub-group entries themselves are separated by commas, mostly. When data is missing, it should not leave an abandoned separator in place, if the width is not given, the height should not display either, if the title is empty, it should be replaced by Untitled, if the artist is still alive, there should be a * before their year of birth, and so on.

Usually this would require a lot of fiddling with conditional statements, implode commands etc.

The plugin offers methods to make this process significantly simpler. Here is how the code could look, making use of some of the plugin’s field methods:

// assuming we have two variables $artwork and $artist holding content on both
field(
  [
    $artist->name()->or('Unknown'),
    field($artist->born(), $artist->died(), '-')
      ->prefix('*', when: $artist->died()->isEmpty()),
    $artist->birthplace()
  ],
  [
    $artwork->title()->or('Untitled'),
    $artwork->year()
  ],
  [
    $artwork->material(),
    $artwork->width()->merge($artwork->height(), ' × ')
      ->when($artwork->width(), $artwork->height())
      ->suffix(' cm')
      ->wrap('(', ')'),
    ''
  ],
  $artwork->collection(),
  $artwork->description(),
  '; '
);

The result might look something like this:

Edward McDoe, 1856-1936, Scotland; Solitude, 1881; Oil on canvas (56 × 82 cm); Summerfield Collection; An impressionistic depiction of a lone farmer in the fields.

As this setup will flexibly handle empty fields, for another content file, where the artwork’s title, the dimensions and the collection are missing and the artist is still alive, it might result in something like this instead:

Jil Nash ,*1982, Ireland; Untitled, 1994; Acrylic on wood; An abstract color explosion.

Additionally we could wrap fields into tags for styling, change fields conditionally etc. See below for a detailed list of available field methods.

Installation

Download

Download and copy this repository to /site/plugins/field-composer.

Git submodule

git submodule add https://github.com/trych/kirby-field-composer.git site/plugins/field-composer

Composer

composer require trych/kirby-field-composer

Usage

When looking at the field methods, let's assume we have a page describing a painting with this content:

Title: Haze
----
Artist: Jil Nash
----
Year: 2014
----
Width: 48.2
----
Height: 67
----
Depth:
----
Description: Faint shapes lost in mist.
----
Info:
----
Museum: Tate

Field Methods

Each of the plugin's field methods returns a field, so the methods can all be used to chain multiple field methods.

`$field->merge(...$args)`

Merges the field's value with the given arguments. The merge() method is the heart of the plugin and allows for complex composing of multiple fields and strings.

$args: one or multiple arguments (fields, strings, numbers, arrays) that will be merged to a single field's value.

In its most simple form, it can merge the value of the original field with one or more given arguments. The default separator is , .

$page->title()->merge($page->year());
// => Haze, 2014

Further field methods can still be chained to the merge() method.

$page->title()->merge($page->artist())->upper();
// => HAZE, JIL NASH

Strings can be merged as well.

$page->title()->merge($page->artist(), 'Oil on canvas', $page->year());
// => Haze, Jil Nash, Oil on canvas, 2014

Empty fields will simply be omitted, without introducing duplicate separators.

$page->title()->merge($page->artist(), $page->info(), $page->year());
// => Haze, Jil Nash, 2014

If a string is used as the last argument, it will be interpreted as the separator to place between the separate parts. Otherwise the default separator (', ' or the one set via the mergeSeparator option) will be used.

$page->title()->merge($page->artist(), $page->year(), ' / ');
// => Haze / Jil Nash / 2014

If you want to merge a string as the last argument, remember to explicitly set the separator even if it matches the default separator, otherwise the last string to merge would be interpreted as separator.

// 🚫 this will use the string 'Sold' as a separator
$page->title()->merge($page->artist(), $page->year(), 'Sold');
// => HazeSoldJil NashSold2014

// ✅ pass the separator explicitly as the last argument instead
$page->title()->merge($page->artist(), $page->year(), 'Sold', ', ');
// => Haze, Jil Nash, 2014, Sold

If the original field's value should not be merged at the first position, an integer can be used as the last argument to specify the position at which the value should merge.

$page->title()->upper()->merge($page->year(), $page->artist(), $page->museum(), 2);
// => 2014, Jil Nash, HAZE, Tate

Negative integers can be used as well, to count from the back of the list.

$page->title()->upper()->merge($page->year(), $page->artist(), $page->museum(), -1);
// => 2014, Jil Nash, Tate, HAZE

If the last argument is set to false, the original value will not be merged at all, instead only the given arguments will be merged. This can be useful in more complex scenarios where the original value is part of a „sub-group“ within the string (see the merge() method’s use with arrays below).

$page->title()->merge($page->year(), $page->artist(), $page->museum(), false);
// => 2014, Jil Nash, Tate

If the last argument is used to specify the position, the separator string can be provided as the second to last argument.

$page->title()->upper()->merge($page->artist(), $page->year(), $page->museum(), ' / ', 2);
// => Jil Nash / 2014 / HAZE / Tate

If an array is provided as one of the arguments, its entries will be merged by the same rules, except that there is no original field value that is passed and therefore there is also no position option. This allows for complex merging when there are several "sub-groups" in the resulting string that might have different separators.

$page->title()->upper()->merge(
  [$page->artist(), $page->year()], // arguments will be merged separated by the default by ', '
  [$page->description(), $page->info(), $page->museum(), ' | '], // arguments will be merged separated by ' | '
  'Sold',
  '; ' // separator, top level arguments will be merged separated by `; `
);
// => HAZE; Jil Nash, 2014; Faint shapes lost in mist | Tate; Sold

`$field->prefix($prefix, $separator, $when)`

Adds a prefix to the field's value. If the field is empty or the condition is not met, no prefix is added. If an empty field is passed as the prefix, there will be no prefix and no separator added, so the field keeps its original value.

$prefix: The prefix to add (can be a Field or a string).
$separator: Optional separator between the prefix and the field value.
$when: Optional condition that determines whether to add the prefix. Default is true.

$page->title()->prefix('Title: ');
// => Title: Haze

$page->info()->prefix('Additional info: ');
// => [returns an empty field, as the info field is also empty]

$page->title()->prefix($page->artist(), ': ');
// => Jil Nash: Haze

$artist->born()->prefix('*', '', $artist->died()->isEmpty());
// => *1982

// if you do not like to pass redundant arguments or like to be explicit
// you can also pass named arguments
$artist->born()->prefix('*', when: $artist->died()->isEmpty());
// => *1982

`$field->suffix($suffix, $separator, $when)`

Adds a suffix to the field's value. If the field is empty or the condition is not met, no suffix is added. If an empty field is passed as the suffix, there will be no suffix and no separator added, so the field keeps its original value.

$suffix: The suffix to add (can be a Field or a string).
$separator: Optional separator between the field value and the suffix.
$when: Optional condition that determines whether to add the suffix. Default is true.

$page->width()->suffix(' cm');
// => 48.2 cm

$page->width()->merge($page->height(), $page->depth(), ' × ')
  ->prefix('Dimensions: ')
  ->suffix(' cm');
// => Dimensions: 48.2 × 67 cm

In the above example, if all of the fields width, height, depth were empty, the merge would result in an empty field and neither the prefix nor the suffix values would be applied.

`$field->wrap($before, $after, $separator, $when)`

Wraps the field's value with specified strings or field values. If the field is empty or the condition is not met, no wrapping strings will be added.

$before: The string or field to prepend to the field's value.
$after: The string or field to append to the field's value. If null, $before is used.
$separator: An optional separator between the field value and the wrapping strings.
$when: Optional condition that determines whether to wrap the field. Default is true.

$page->title()->wrap('»', '«');
// => »Haze«

If an empty field is passed to before or after, there is no string prepended / appended and no separator inserted.

$page->artist()->wrap($page->title(), $page->info(), ' | ');
// => Haze | Jil Nash

`$field->tag($tag, $attr, $indent, $level, $when)`

Wraps the field's value in an HTML tag. If the field is empty or the condition is not met, no tags are added.

$tag: The HTML tag to wrap the field's value in.
$attr: An associative array of HTML attributes for the tag.
$indent: The indentation string, or null for no indentation.
$level: The indentation level. Defaults to 0.
$when: Optional condition that determines whether to wrap the field in a tag. Default is true.

$page->title()->tag('h1');
// => <h1>Haze</h1>

$page->description()->tag('p', ['class' => 'description']);
// => <p class="description">Faint shapes lost in mist.</p>

`$field->when(...$conditions)`

Returns the original field if all conditions are valid, otherwise returns an empty field. If a field is passed as one of the conditions, it evaluates to false in case it is empty.

$conditions: Variable number of conditions to check.

// just pass the dimensions, if both the `width` and the `height` are given
$page->width()->merge($page->height(), ' × ')->suffix(' cm')
  ->when($page->width(), $page->height());
// => 48.2 × 67 cm

`$field->whenAny(...$conditions)`

Returns the original field if any of the conditions is valid, otherwise returns an empty field. If a field is passed as one of the conditions, it evaluates to false in case it is empty.

$conditions: Variable number of conditions to check.

// just pass the museum, if either `artist` or `info` are given
$page->museum()->prefix('Gallery: ', '')->whenAny($page->artist(), $page->info());
// => Gallery: Tate

`$field->notWhen(...$conditions)`

Returns an empty field if all conditions are valid, otherwise returns the original field. If a field is passed as one of the conditions, it evaluates to false in case it is empty.

$conditions: Variable number of conditions to check.

// shows the `description` only if `info` is empty
$page->description()->notWhen($page->info());
// => Faint shapes lost in mist.

`$field->notWhenAny(...$conditions)`

Returns an empty field if any of the conditions are valid, otherwise returns the original field. If a field is passed as one of the conditions, it evaluates to false in case it is empty.

$conditions: Variable number of conditions to check.

// do not pass museum if either `artist` or `info` are given
$page->museum()->notWhenAny($page->artist(), $page->info());
// => [empty, as `artist` is given]

`$field->whenAll(...$conditions)`

Alias for when(). Returns the field if all conditions are valid.

`$field->whenNone(...$conditions)`

Alias for notWhenAny(). Returns the field if none of the conditions are valid.

`$field->format($callback)`

Applies a custom formatting function to the field's value.

This is very similar to Kirby’s native $field->callback() method, except that for convenience the field’s value is used as the first parameter of the callback function (with the field itself being the second one) and only a string needs to be returned, the re-wrapping into a field happens automatically. Returning the field with the new value directly will also work, though.

$callback: A closure that takes the field's value and the field object as arguments, and returns the new formatted value. The value will be automatically wrapped in a field again.

// remove all vowels from a string
$page->description()->format(function($value) {
  return preg_replace('/[aeiou]/i', '', $value);
});
// => Fnt shps lst n mst.

`$field->str($method, ...$args)`

Applies a Kirby Str class method to the field's value.

$method: The name of the Str class method to apply.
$args: Additional arguments to pass to the Str method.

// Change the field's value to camel case
$page->artist()->str('camel');
// => jilNash

// Adds -1 to the field's value or increments the ending number to allow -2, -3, etc.
$page->title()->lower()->str('increment');
// => haze-1

Helpers

The plugin provides a global helper function field() along with a shortcut alias f().

`field(...$args)`

The field helper allows you to compose a field from given values. This field can then be used to chain it with other field methods. The arguments work the same way as they do in the $field->merge() field method described above: You can pass fields, strings or numbers and they will be merged to the new field’s value.

field($page->title(), $page->artist(), 'sold', ', ')->upper()
// => HAZE, JIL NASH, SOLD

If an array is passed, it will merge its values to a field by the same rules. If the last given argument is a string, it will be interpreted as a separator. Unlike the $field->merge() method, the last argument cannot be used as a position parameter as there is no initial field value that gets passed into the field() helper.

The field helper is especially useful if you need to compose a field where the first value is part of a „sub-group“ or if you need to chain further field methods to such a sub-group, as shown in the example below.

field(
  [$page->title()->tag('em'), $page->year()],
  $page->artist(),
  field($page->width(), $page->height(), ' × ')->suffix(' cm')
    ->when($page->width(), $page->height()),
  $page->description()->prefix('Subject: '),
  $page->info()->prefix('Info: '),
  '; ' // separator for the top level
);
// => <em>Haze</em>, 2014; Jil Nash; 48.2 × 67 cm; Subject: Faint shapes lost in mist.

`f(...$args)`

Alias for field().

You can disable one or both helpers by setting their respective constant in index.php to false as described in the Kirby helper docs.

// /index.php

<?php

define('KIRBY_HELPER_FIELD', false);
define('KIRBY_HELPER_F', false);

require __DIR__ . '/kirby/bootstrap.php';

echo (new Kirby)->render();

Options

The plugin has two options, mergeSeparator and affixSeparator.

The mergeSeparator sets the default separator for the $field->merge() as well as the field() helper. Its default value is a comma followed by a space: ', '.

The affixSeparator sets the default separator for the field methods $field->prefix(), $field->suffix() and $field->wrap() ("affix" being the umbrella term for "prefix" and "suffix"). Its default value is an empty string: ''.

You can change both defaults in your config.php file.

// /site/config/config.php

return [
  'trych.field-composer' => [
    'mergeSeparator' => ' | ',
    'affixSeparator' => ' '
  ]
];

If a separator is explicitly provided in a method call of the mentioned field methods, it will override these options for that specific operation.

Contributing

If you encounter any issues or have suggestions, please open an new issue.

Name		Name	Last commit message	Last commit date
Latest commit History 22 Commits
classes		classes
vendor		vendor
.gitattributes		.gitattributes
.gitignore		.gitignore
LICENSE		LICENSE
README.md		README.md
composer.json		composer.json
composer.lock		composer.lock
index.php		index.php

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Kirby Field Composer

Features

Overview

Installation

Download

Git submodule

Composer

Usage

Field Methods

`$field->merge(...$args)`

`$field->prefix($prefix, $separator, $when)`

`$field->suffix($suffix, $separator, $when)`

`$field->wrap($before, $after, $separator, $when)`

`$field->tag($tag, $attr, $indent, $level, $when)`

`$field->when(...$conditions)`

`$field->whenAny(...$conditions)`

`$field->notWhen(...$conditions)`

`$field->notWhenAny(...$conditions)`

`$field->whenAll(...$conditions)`

`$field->whenNone(...$conditions)`

`$field->format($callback)`

`$field->str($method, ...$args)`

Helpers

`field(...$args)`

`f(...$args)`

Options

Contributing

License

About

Releases

Packages

Languages

License

trych/kirby-field-composer

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Latest commit

History

Repository files navigation

Kirby Field Composer

Features

Overview

Installation

Download

Git submodule

Composer

Usage

Field Methods

$field->merge(...$args)

$field->prefix($prefix, $separator, $when)

$field->suffix($suffix, $separator, $when)

$field->wrap($before, $after, $separator, $when)

$field->tag($tag, $attr, $indent, $level, $when)

$field->when(...$conditions)

$field->whenAny(...$conditions)

$field->notWhen(...$conditions)

$field->notWhenAny(...$conditions)

$field->whenAll(...$conditions)

$field->whenNone(...$conditions)

$field->format($callback)

$field->str($method, ...$args)

Helpers

field(...$args)

f(...$args)

Options

Contributing

License

About

Resources

License

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Releases

Packages 0

Languages

`$field->merge(...$args)`

`$field->prefix($prefix, $separator, $when)`

`$field->suffix($suffix, $separator, $when)`

`$field->wrap($before, $after, $separator, $when)`

`$field->tag($tag, $attr, $indent, $level, $when)`

`$field->when(...$conditions)`

`$field->whenAny(...$conditions)`

`$field->notWhen(...$conditions)`

`$field->notWhenAny(...$conditions)`

`$field->whenAll(...$conditions)`

`$field->whenNone(...$conditions)`

`$field->format($callback)`

`$field->str($method, ...$args)`

`field(...$args)`

`f(...$args)`

Packages