Add redirect removed severity

Author: danielRConsid

README.md

@@ -2,7 +2,11 @@
 
 ![Screen dump on how blunder looks like](https://wazabii.se/github-assets/maplephp-blunder.png "MaplePHP Blunder")
 
-**Blunder is a designed error handling framework for PHP.** It provides a pretty, user-friendly interface that simplifies debugging with excellent memory management. Blunder offers various handlers, including HTML, JSON, XML, plain text, and silent modes, allowing flexible error presentation. Seamlessly integrating with tools like the PSR-7 and PSR-3 compliant MaplePHP Log library, Blunder is an excellent choice for managing errors in PHP applications, helping users easily identify and resolve issues.
+**Blunder is a designed error handling framework for PHP.** It provides a pretty, user-friendly interface that simplifies 
+debugging with excellent memory management. Blunder offers various handlers, including HTML, JSON, XML, CLI, plain text, 
+and silent modes, allowing flexible error presentation. Seamlessly integrating with tools like the PSR-7 and PSR-3 
+compliant MaplePHP Log library, Blunder is an excellent choice for managing errors in PHP applications, helping users easily 
+identify and resolve issues.
 
 ## Installation
 Installation with composer
@@ -36,19 +40,106 @@ All handlers utilize the namespace `MaplePHP\Blunder\Handlers\[TheHandlerName]`.
 * **SilentHandler**: Suppresses error output but can log errors to files. You can choose to output fatal errors if necessary.
 
 
-## Exclude severities
-You can exclude/remove severities from the error handler.
+## Excluding Specific Error Severities from the Handler
+
+With Blunder, you can exclude specific error severities from the handler. This allows you to control how certain errors are processed without affecting the overall error handling behavior.
+
+### 1. Exclude Severity Levels
+This method removes the specified severities from Blunder’s handler, allowing them to be processed by PHP’s default error reporting.
 
 ```php
 $run = new Run(new HtmlHandler());
 $run->severity()->excludeSeverityLevels([E_DEPRECATED, E_USER_DEPRECATED]);
 $run->load();
 ```
-*[You can find a list of available severities here](https://www.php.net/manual/en/errorfunc.constants.php)*
+**Effect:**
+- `E_DEPRECATED` and `E_USER_DEPRECATED` will no longer be handled by Blunder.
+- PHP’s default error handling will take over for these severities.
+
+---
+
+### 2. Exclude and Redirect Severities
+Instead of letting PHP handle the excluded severities, you can redirect them to a custom function for further processing, such as logging.
+
+#### **Behavior:**
+- **`return true;`** → Completely suppresses errors of the excluded severities.
+- **`return false;`** → Uses PHP’s default error handler for the excluded severities.
+- **`return null|void;`** → Keeps using Blunder’s error handler as usual.
+
+```php
+$run = new Run(new HtmlHandler());
+$run->severity()
+    ->excludeSeverityLevels([E_WARNING, E_USER_WARNING])
+    ->redirectTo(function ($errNo, $errStr, $errFile, $errLine) {
+        error_log("Custom log: $errStr in $errFile on line $errLine");
+        return true; // Suppresses output for excluded severities
+    });
+```
+
+**Example Use Case:**
+- Log warnings instead of displaying them.
+- Ensure deprecated notices are logged but not shown in production.
+
+---
+
+### 3. Redirect Excluded Severities to a New Handler
+You can also redirect excluded severities to a completely different error handler.
+
+```php
+$run = new Run($errorHandler);
+$run->severity()
+    ->excludeSeverityLevels([E_WARNING, E_USER_WARNING])
+    ->redirectTo(function ($errNo, $errStr, $errFile, $errLine) {
+        return new JsonHandler();
+    });
+```
+**Effect:**
+- `E_WARNING` and `E_USER_WARNING` will be processed by `JsonHandler` instead of `HtmlHandler` or PHP’s default error handling.
+
+---
+
+**Note:**  
+You can find a full list of available PHP error severities [here](https://www.php.net/manual/en/errorfunc.constants.php).
 
-## Advanced Usage
+---
 
-### Event Handling
+## Enabling or Disabling Trace Lines
+This allows you to control the level of detail shown in error messages based on your debugging needs. 
+You can customize this behavior using the configuration:
+
+```php
+$handler = new CliHandler();
+
+// Enable or disable trace lines
+$handler->enableTraceLines(true); // Set false to disable
+
+$run = new Run($handler);
+$run->load();
+```
+
+### **Options:**
+- `true` → Enables trace lines (default in all cases except for in the CliHandler).
+- `false` → Disables trace lines, making error messages cleaner.
+
+This allows you to control the level of detail shown in error messages based on your debugging needs.
+
+## Remove location headers
+This will remove location headers and make sure that no PHP redirect above this code will execute. 
+```php
+$run = new Run(new HtmlHandler());
+$run->removeLocationHeader(true);
+$run->load();
+```
+
+## Setting the Exit Code for Errors
+To make Blunder trigger a specific exit code when an error occurs. This is useful in unit testing and CI/CD, ensuring tests fail on errors.
+```php
+$run = new Run(new CliHandler());
+$run->setExitCode(1);
+$run->load();
+```
+
+## Event Handling
 
 You can use Blunder's **event** functionality to handle errors, such as logging them to a file. The example below shows how to display a pretty error page in development mode and log errors in production.
 
@@ -101,11 +192,34 @@ $run->event(function($item, $http) use($production) {
 $run->load();
 ```
 
-### HTTP Messaging
+## HTTP Messaging
 
 The Blunder `Run` class can take two arguments. The first argument is required and should be a class handler (`HandlerInterface`). The second argument is optional and expects an HTTP message class used to pass an already open PSR-7 response and `ServerRequest` instance instead of creating a new one for better performance.
 
 ```php
 // $run = new Run(HandlerInterface, HttpMessagingInterface(ResponseInterface, ServerRequestInterface));
 $run = new Run(new HtmlHandler(), new HttpMessaging($response, $request));
+```
+
+## Exception Chaining
+When rethrowing an exception with a different type, PHP resets the file and line number to the location of the new `throw` statement. This can make debugging harder, as the error message will point to the wrong file instead of the original source of the exception.
+
+To preserve the original exception’s file and line number while changing its type, you can use the **`preserveExceptionOrigin`** method provided by Blunder.
+
+#### Example: Preserving the Original Exception’s Location
+```php
+try {
+    // An exception has been triggered inside dispatch()
+    $dispatch = $row->dispatch();
+} catch (Throwable $e) {
+    // By default, rethrowing with a new exception class changes the error location
+    $exception = new RuntimeException($e->getMessage(), (int) $e->getCode());
+
+    // Preserve the original exception's file and line number
+    if (method_exists($e, "preserveExceptionOrigin")) {
+        $e->preserveExceptionOrigin($exception);
+    }
+
+    throw $exception;
+}
 ```

src/BlunderErrorException.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace MaplePHP\Blunder;
+
+use Exception;
+use ErrorException;
+use ReflectionClass;
+use Throwable;
+
+class BlunderErrorException extends ErrorException
+{
+    protected ?string $prettyMessage = null;
+
+    /**
+     * Will return the default ErrorException message
+     *
+     * @return string|null
+     */
+    public function getPrettyMessage(): ?string
+    {
+        return (!is_null($this->prettyMessage)) ? $this->prettyMessage : $this->message;
+    }
+
+    /**
+     * Set pretty message that can be used in execption handlers
+     *
+     * @param string $message
+     * @return void
+     */
+    public function setPrettyMessage(string $message): void
+    {
+        $this->prettyMessage = $message;
+    }
+
+    /**
+     * Preserves the original exception's file and line number
+     * when rethrowing with a different exception type.
+     *
+     * @param Exception $exception The new exception instance that will receive the original file and line number.
+     * @return void
+     */
+    public function preserveExceptionOrigin(Throwable $exception): void
+    {
+        $reflection = new ReflectionClass(Exception::class);
+        $fileProp = $reflection->getProperty('file');
+        $fileProp->setValue($exception, $this->getFile());
+        $lineProp = $reflection->getProperty('line');
+        $lineProp->setValue($exception, $this->getLine());
+    }
+}