Document 5.4 features: PluralRules, EnumLabelTrait, FormHelper hidden default, subcommand validation, enumOptions

Adds docs and 5.4 migration guide entries for several 5.next merges:

- PluralRules::setRule() / resetRules() for custom Gettext plural rules.
- EnumLabelTrait + Label attribute for derived translated enum labels.
- FormHelper now wraps hidden CSRF / FormProtection blocks with the HTML5
  boolean hidden attribute instead of inline style display:none, so the
  default markup is strict-CSP compatible.
- CLI rejects unknown positional tokens after a parent command that has
  sibling subcommands, surfacing typos instead of silently dropping them.
- FormHelper::enumOptions() is now public for building select options from
  a backed enum without entity context.

Author: dereuromark

docs/en/appendices/5-4-migration-guide.md

@@ -26,6 +26,14 @@ Running `bin/cake` without providing a command name no longer displays the
 "No command provided" error message. Instead, the `help` command is shown
 directly.
 
+Unknown positional tokens following a parent command that has sibling
+subcommands are now rejected with a clear error listing the available
+subcommands. For example, `bin/cake i18n nonsense` previously silently
+invoked the parent `I18nCommand` and discarded the trailing token; it now
+errors out. Commands that intentionally accept arbitrary positional arguments
+(e.g. `routes generate`) are unaffected.
+See [Subcommand Validation](../console-commands/commands#subcommand-validation).
+
 The `help` command is now hidden from command listings (via
 `CommandHiddenInterface`). It remains accessible by running `bin/cake help` or
 `bin/cake help <command>`.
@@ -68,6 +76,16 @@ See [Application and Plugin Events](../core-libraries/events#registering-event-l
 - Loading a component with the same alias as the controller's default table now
   triggers a warning. See [Component Alias Conflicts](../controllers/components#component-alias-conflicts).
 
+### View
+
+- `FormHelper` now wraps hidden form blocks (CSRF, FormProtection,
+  `postLink()` / `postButton()`) with the HTML5 boolean `hidden` attribute
+  instead of an inline `style="display:none;"`. This makes the default markup
+  compatible with a strict Content-Security-Policy (no need for
+  `style-src 'unsafe-inline'`). If you previously selected those wrappers via
+  CSS (e.g. `div[style="display:none;"]`), switch to `[hidden]` or set the
+  `hiddenClass` template option to opt out and emit a class instead.
+
 ## Deprecations
 
 ### Command Helpers
@@ -145,6 +163,11 @@ See [Application and Plugin Events](../core-libraries/events#registering-event-l
   provides constants (`Index::GIN`, `Index::GIST`, `Index::SPGIST`,
   `Index::BRIN`, `Index::HASH`) for these access methods.
   See [Reading Indexes and Constraints](../orm/schema-system#reading-indexes-and-constraints).
+- Added `Cake\Database\Type\EnumLabelTrait` and the
+  `Cake\Database\Type\Attribute\Label` attribute. The trait provides a default
+  `label()` implementation backed by the translator and the attribute lets
+  individual cases override the derived label. See
+  [EnumLabelTrait and the Label Attribute](../orm/database-basics#enumlabeltrait-and-the-label-attribute).
 
 ### Http
 
@@ -166,6 +189,10 @@ See [Application and Plugin Events](../core-libraries/events#registering-event-l
 - Added `I18n::setCacheConfig()` to route translator persistence to a Cache
   config other than the default `_cake_translations_`.
 - The `cake i18n extract` command now also extracts enum labels using the #[Label] attribute.
+- Added `PluralRules::setRule()` to register a custom Gettext plural rule for
+  a locale whose built-in form is missing or differs from the layout used by
+  your .po/.mo files. See
+  [Customizing Plural Rules](../core-libraries/internationalization-and-localization#customizing-plural-rules).
 
 ### ORM
 
@@ -191,3 +218,6 @@ See [Application and Plugin Events](../core-libraries/events#registering-event-l
 
 - Added `{{inputId}}` template variable to `inputContainer` and `error` templates
   in FormHelper. See [Built-in Template Variables](../views/helpers/form#built-in-template-variables).
+- `FormHelper::enumOptions()` is now public. This lets you build `select`
+  options from a backed enum class even when the form was created without
+  an entity context. See [Creating Select Pickers](../views/helpers/form#creating-select-pickers).

docs/en/console-commands/commands.md

@@ -318,6 +318,30 @@ Usage:
 cake user [-h] [-q] [-v]
 ```
 
+## Subcommand Validation
+
+::: info Added in version 5.4.0
+Strict validation for unknown subcommands was added in 5.4.0.
+:::
+
+When a parent command has registered subcommands (e.g. `i18n extract`,
+`i18n init`), CakePHP rejects unknown positional tokens that follow the
+parent name. Previously, typos such as `bin/cake i18n nonsense` silently
+invoked the parent command and discarded the trailing token; now you get a
+clear error listing the available subcommands:
+
+```text
+$ bin/cake i18n nonsense
+Error: Unknown command `cake i18n nonsense`.
+Available subcommands: `i18n extract`, `i18n init`.
+Run `cake i18n --help` to see usage.
+```
+
+This only kicks in when the parent command has sibling subcommands. Commands
+that accept arbitrary positional arguments (e.g. `routes generate`) are
+unaffected, and option-like tokens (`--help`, `-v`) following the command
+name continue to be forwarded to the parser.
+
 ## Grouping Commands
 
 By default, in the help output CakePHP will group commands into core, app, and

docs/en/core-libraries/internationalization-and-localization.md

@@ -425,6 +425,65 @@ msgstr[2] "{0} datoteka je uklonjeno"
 Please visit the [Launchpad languages page](https://translations.launchpad.net/+languages)
 for a detailed explanation of the plural form numbers for each language.
 
+#### Customizing Plural Rules
+
+::: info Added in version 5.4.0
+`PluralRules::setRule()` and `PluralRules::resetRules()` were added in 5.4.0.
+:::
+
+When `__n()` / `__dn()` and the other Gettext-style plural functions resolve a
+message, CakePHP picks the plural form via `Cake\I18n\PluralRules::calculate()`.
+The built-in rules cover most CLDR locales, but they can lag behind upstream
+CLDR releases and they do not cover every minority language. If you hit a
+locale whose plural form is missing or wrong, you can register a custom rule
+without patching CakePHP:
+
+```php
+use Cake\I18n\PluralRules;
+
+// Breton: 5 plural forms (CLDR)
+PluralRules::setRule('br', function (int $n): int {
+    if ($n % 10 === 1 && $n % 100 !== 11 && $n % 100 !== 71 && $n % 100 !== 91) {
+        return 0;
+    }
+    if ($n % 10 === 2 && $n % 100 !== 12 && $n % 100 !== 72 && $n % 100 !== 92) {
+        return 1;
+    }
+    if (in_array($n % 10, [3, 4, 9], true)
+        && !in_array($n % 100, [13, 14, 19, 73, 74, 79, 93, 94, 99], true)
+    ) {
+        return 2;
+    }
+    if ($n !== 0 && $n % 1_000_000 === 0) {
+        return 3;
+    }
+
+    return 4;
+});
+```
+
+The closure receives the integer count and must return the zero-based plural
+form index that matches the `msgstr[N]` entries in your **.po** / **.mo**
+files. Custom rules take precedence over the built-in map, so they can also
+be used to override a built-in rule that does not match the form layout used
+by your translation files.
+
+Register rules in **config/bootstrap.php** so they are available before any
+translation is requested. The locale string is normalized via
+`Locale::canonicalize()` and an invalid locale throws an
+`InvalidArgumentException`. To drop all registered custom rules (typically
+between tests), call:
+
+```php
+PluralRules::resetRules();
+```
+
+> [!NOTE]
+> `PluralRules` is only consulted for Gettext-style messages
+> (`__n()`, `__dn()`, `msgstr[0]` / `msgstr[1]` / …). The ICU plural selector
+> shown above resolves its own forms via `MessageFormatter` and is unaffected
+> by `setRule()`.
+
 ## Creating Your Own Translators
 
 If you need to diverge from CakePHP conventions regarding where and how

docs/en/orm/database-basics.md

@@ -596,7 +596,54 @@ enum ArticleStatus: string implements EnumLabelInterface
 ```
 
 This can be useful if you want to use your enums in `FormHelper` select
-inputs. You can use [bake](../bake) to generate an enum class:
+inputs.
+
+#### EnumLabelTrait and the Label Attribute
+
+::: info Added in version 5.4.0
+`Cake\Database\Type\EnumLabelTrait` and the
+`Cake\Database\Type\Attribute\Label` attribute were added in 5.4.0.
+:::
+
+Writing the `label()` `match` block by hand becomes repetitive once an enum
+grows past a few cases. `EnumLabelTrait` provides a default `label()`
+implementation that derives the label from the case name and resolves it
+through the translator. Cases can override the derived label with the
+`#[Label]` attribute:
+
+```php
+namespace App\Model\Enum;
+
+use Cake\Database\Type\Attribute\Label;
+use Cake\Database\Type\EnumLabelInterface;
+use Cake\Database\Type\EnumLabelTrait;
+
+enum ArticleStatus: string implements EnumLabelInterface
+{
+    use EnumLabelTrait;
+
+    case Published = 'Y';
+
+    #[Label('Not yet published')]
+    case Unpublished = 'N';
+
+    #[Label('Archived', domain: 'articles', context: 'status')]
+    case Archived = 'A';
+}
+```
+
+For a case **without** a `#[Label]` attribute, the trait humanizes the case
+name (`Unpublished` → `Unpublished`, `InReview` → `In review`) and runs it
+through the translator. For cases **with** a `#[Label]`, the explicit label
+string is used and is translated using the optional `domain` and `context`
+constructor arguments. Labels are extracted by `cake i18n extract`, which
+detects the `#[Label]` attribute and emits one msgid per case.
+
+> [!TIP]
+> Pair `EnumLabelTrait` with `EnumLabelInterface` so type-aware consumers
+> (e.g. `FormHelper`'s automatic enum support) keep working.
+
+You can use [bake](../bake) to generate an enum class:
 
 ```bash
 # generate an enum class with two cases and stored as an integer

docs/en/views/helpers/form.md

@@ -1462,6 +1462,24 @@ Output:
 </select>
 ```
 
+To build `$options` from a backed enum, you can use `enumOptions()`:
+
+```php
+use App\Model\Enum\ArticleStatus;
+
+echo $this->Form->select('status', $this->Form->enumOptions(ArticleStatus::class));
+```
+
+When `ArticleStatus` implements `EnumLabelInterface` (or uses
+`EnumLabelTrait`), the option text is taken from `label()`; otherwise the
+case name is used. This is useful when the form was created without an
+entity context, where the automatic enum detection on `control()` does not
+apply.
+
+::: info Added in version 5.4.0
+`FormHelper::enumOptions()` was made public in 5.4.0.
+:::
+
 **Controlling Select Pickers via Attributes**
 
 By using specific options in the `$attributes` parameter you can control
@@ -2140,14 +2158,22 @@ echo $this->Form->end(['data-type' => 'hidden']);
 Will output:
 
 ```html
-<div style="display:none;">
+<div hidden="hidden">
     <input type="hidden" name="_Token[fields]" data-type="hidden"
         value="2981c38990f3f6ba935e6561dc77277966fabd6d%3AAddresses.id">
     <input type="hidden" name="_Token[unlocked]" data-type="hidden"
         value="address%7Cfirst_name">
 </div>
 ```
 
+::: info Added in version 5.4.0
+The wrapper around hidden security tokens now defaults to the HTML5
+`hidden` boolean attribute instead of `style="display:none;"`. This avoids
+needing `style-src 'unsafe-inline'` under a strict Content-Security-Policy.
+You can still opt for a CSS class instead by setting the `hiddenClass`
+template option on `FormHelper`.
+:::
+
 > [!NOTE]
 > If you are using
 > `Cake\Controller\Component\FormProtectionComponent` in your
@@ -2190,11 +2216,11 @@ Will output HTML similar to:
 
 ```html
 <form method="post" accept-charset="utf-8" action="/Rtools/tickets/delete/5">
-    <div style="display:none;">
+    <div hidden="hidden">
         <input name="_method" value="POST" type="hidden">
     </div>
     <button type="submit">Delete Record</button>
-    <div style="display:none;">
+    <div hidden="hidden">
         <input name="_Token[fields]" value="186cfbfc6f519622e19d1e688633c4028229081f%3A" type="hidden">
         <input name="_Token[unlocked]" value="" type="hidden">
         <input name="_Token[debug]" value="%5B%22%5C%2FRtools%5C%2Ftickets%5C%2Fdelete%5C%2F1%22%2C%5B%5D%2C%5B%5D%5D" type="hidden">