Merge pull request #80 from adhocore/79-exception-handler

README.md

@@ -8,10 +8,11 @@ Framework agnostic Command Line Interface utilities and helpers for PHP. Build C
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 - Command line application made easy
@@ -252,6 +253,25 @@ $app->add((new ConfigListCommand)->inGroup('Config'));
 ...
 ```
 
+#### Exception handler
+
+Set a custom exception handler as callback. The callback receives exception & exit code. The callback may rethrow exception or may exit the program or just log exception and do nothing else.
+
+```php
+$app = new Ahc\Cli\Application('App', 'v0.0.1');
+$app->add(...);
+$app->onException(function (Throwable $e, int $exitCode) {
+    // send to sentry
+    // write to logs
+
+    // optionally, exit with exit code:
+    exit($exitCode);
+
+    // or optionally rethrow, a rethrown exception is propagated to top layer caller.
+    throw $e;
+})->handle($argv);
+```
+
 #### App help
 
 It can be triggered manually with `$app->showHelp()` or automatic when `-h` or `--help` option is passed to `$app->parse()`.

src/Application.php

@@ -59,6 +59,9 @@ class Application
     /** @var callable The callable to perform exit */
     protected $onExit;
 
+    /** @var callable The callable to catch exception, receives exception & exit code, may rethrow exception or may exit program */
+    protected $onException = null;
+
     public function __construct(protected string $name, protected string $version = '0.0.1', callable $onExit = null)
     {
         $this->onExit = $onExit ?? static fn (int $exitCode = 0) => exit($exitCode);
@@ -123,7 +126,7 @@ public function logo(string $logo = null)
     }
 
     /**
-     * Add a command by its name desc alias etc.
+     * Add a command by its name desc alias etc and return command.
      */
     public function command(
         string $name,
@@ -140,7 +143,7 @@ public function command(
     }
 
     /**
-     * Add a prepred command.
+     * Add a prepared command and return itself.
      */
     public function add(Command $command, string $alias = '', bool $default = false): self
     {
@@ -256,6 +259,19 @@ public function parse(array $argv): Command
         return $command->parse($argv);
     }
 
+    /**
+     * Sets exception handler callback.
+     *
+     * The callback receives exception & exit code. It may rethrow exception
+     * or may exit the program or just log exception and do nothing else.
+     */
+    public function onException(callable $fn): self
+    {
+        $this->onException = $fn;
+
+        return $this;
+    }
+
     /**
      * Handle the request, invoke action and call exit handler.
      */
@@ -266,12 +282,12 @@ public function handle(array $argv): mixed
         }
 
         $exitCode = 255;
-
         try {
             $command  = $this->parse($argv);
             $result   = $this->doAction($command);
             $exitCode = is_int($result) ? $result : 0;
         } catch (Throwable $e) {
+            isset($this->onException) && ($this->onException)($e, $exitCode);
             $this->outputHelper()->printTrace($e);
         }
 

tests/ApplicationTest.php

@@ -16,6 +16,7 @@
 use Ahc\Cli\IO\Interactor;
 use InvalidArgumentException;
 use PHPUnit\Framework\TestCase;
+use Throwable;
 
 class ApplicationTest extends TestCase
 {
@@ -288,11 +289,19 @@ public function test_io_returns_new_instance_if_not_provided(): void
         );
     }
 
+    public function test_on_exception()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage($msg = 'this will be rethrown and propagated');
+
+        $cmd = (new Command('cmd'))->action(fn () => throw new InvalidArgumentException($msg));
+        $app = $this->newApp('test')->add($cmd)->onException(fn (Throwable $e) => throw $e);
+        $app->handle(['test', 'cmd']);
+    }
+
     protected function newApp(string $name, string $version = '')
     {
-        $app = new Application($name, $version ?: '0.0.1', function () {
-            return false;
-        });
+        $app = new Application($name, $version ?: '0.0.1', fn () => false);
 
         return $app->io(new Interactor(static::$in, static::$ou));
     }