Add command requirements support

composer.json

@@ -20,6 +20,7 @@
         "jrosset/extendedmonolog":  "^1.1",
         "psr/log":                  "^1.1",
         "symfony/console":          "^5.4",
+        "symfony/event-dispatcher": "^5.4",
         "voku/arrayy":              "^7.9"
     },
     "autoload":          {

src/CliProgram/CliHelper.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace jrosset\CliProgram;
+
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Output\ConsoleOutputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Helper methods
+ */
+abstract class CliHelper {
+    /**
+     * Get the “error” output if exists, else the output itself
+     *
+     * @param OutputInterface $output The output
+     *
+     * @return OutputInterface The “error” output if exists, else the output itself
+     */
+    public static final function getErrorOutput (OutputInterface $output): OutputInterface {
+        return $output instanceof ConsoleOutputInterface ? $output->getErrorOutput() : $output;
+    }
+
+    /**
+     * Get the name of a command class
+     *
+     * @param Application           $application  The application
+     * @param class-string<Command> $commandClass The command class
+     *
+     * @return string|null The command name ; Null if not found
+     */
+    public static final function getCommandNameFromClass (Application $application, string $commandClass): ?string {
+        foreach ($application->all() as $possibleCommand) {
+            if (get_class($possibleCommand) == $commandClass) {
+                return $possibleCommand->getName();
+            }
+        }
+        return null;
+    }
+}

src/CliProgram/Requirements/IRequirements.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace jrosset\CliProgram\Requirements;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Throwable;
+
+/**
+ * Interface for a command requirements
+ */
+interface IRequirements {
+    /**
+     * Check the requirements
+     *
+     * @param InputInterface  $input  The command input
+     * @param OutputInterface $output The command output
+     *
+     * @return void
+     *
+     * @throws Throwable If a requirement failed
+     */
+    public function checkRequirements (InputInterface $input, OutputInterface $output): void;
+}

src/CliProgram/Requirements/TRequirementsApplication.php

@@ -0,0 +1,64 @@
+<?php
+
+namespace jrosset\CliProgram\Requirements;
+
+use jrosset\CliProgram\CliHelper;
+use ReflectionClass;
+use Symfony\Component\Console\ConsoleEvents;
+use Symfony\Component\Console\Event\ConsoleCommandEvent;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
+use Throwable;
+
+/**
+ * An application with command requirements checking
+ *
+ * @see IRequirements
+ */
+trait TRequirementsApplication {
+    /**
+     * Register the listener for command requirements
+     *
+     * @param EventDispatcherInterface|null $dispatcher The event dispatcher is already existing
+     *
+     * @return void
+     */
+    protected final function registerCommandRequirementsListener (?EventDispatcherInterface $dispatcher = null): void {
+        $dispatcher ??= new EventDispatcher();
+        $dispatcher->addListener(ConsoleEvents::COMMAND, [$this, 'checkCommandRequirements']);
+        $this->setDispatcher($dispatcher);
+    }
+
+    /**
+     * Check the requirements of a command
+     *
+     * @param ConsoleCommandEvent $event The command event
+     *
+     * @return void
+     */
+    public function checkCommandRequirements (ConsoleCommandEvent $event): void {
+        $commandInput = $event->getInput();
+        $commandOutput = $event->getOutput();
+        try {
+            //region Check the command is valid
+            if (($command = $event->getCommand()) === null) {
+                return;
+            }
+
+            $commandReflection = new ReflectionClass($command);
+            //endregion
+            //region Contrôle pré-requis (implémentation directe)
+            if ($command instanceof IRequirements) {
+                $command->checkRequirements($commandInput, $commandOutput);
+            }
+            //endregion
+        }
+        catch (Throwable $exception) {
+            $this->renderThrowable($exception, CliHelper::getErrorOutput($commandOutput));
+
+            $event->disableCommand();
+            $event->stopPropagation();
+            return;
+        }
+    }
+}

tests/Application.php

@@ -6,12 +6,15 @@ use jrosset\CliProgram\ApplicationWithCommandMonolog;
 use jrosset\CliProgram\AutoDiscovery\AutoDiscoveryDirectory;
 use jrosset\CliProgram\AutoDiscovery\TAutoDiscoveryApplication;
 use jrosset\CliProgram\AutoPrefix\AutoPrefixNamespaceManager;
+use jrosset\CliProgram\Requirements\TRequirementsApplication;
 
 class Application extends ApplicationWithCommandMonolog {
     use TAutoDiscoveryApplication;
+    use TRequirementsApplication;
 
     public function __construct (string $name = 'UNKNOWN', string $version = 'UNKNOWN') {
         parent::__construct(__DIR__ . '/logs/', $name, $version);
+        $this->registerCommandRequirementsListener();
 
         $spot = new AutoDiscoveryDirectory(__DIR__ . '/Commands');
         $spot->getAutoPrefixManagers()->prepend(new AutoPrefixNamespaceManager('\\jrosset\\Tests\\Commands', 'test'));

tests/Commands/FailedHello.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace jrosset\Tests\Commands;
+
+use LogicException;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class FailedHello extends Hello {
+    /**
+     * @inheritDoc
+     */
+    public function __construct () {
+        parent::__construct('failedHello');
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function checkRequirements (InputInterface $input, OutputInterface $output): void {
+        throw new LogicException('The "foo" requirement failed');
+    }
+}

tests/Commands/Hello.php

@@ -5,6 +5,7 @@ namespace jrosset\Tests\Commands;
 use DateTimeImmutable;
 use DateTimeInterface;
 use jrosset\CliProgram\Output\OutputWithLogger;
+use jrosset\CliProgram\Requirements\IRequirements;
 use jrosset\CliProgram\Validation\CommandWithValidation;
 use jrosset\CliProgram\Validation\Validators\DateValidator;
 use jrosset\CliProgram\Validation\Validators\IntegerValidator;
@@ -14,7 +15,7 @@ use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 
-class Hello extends CommandWithValidation {
+class Hello extends CommandWithValidation implements IRequirements {
     /**
      * @inheritdoc
      */
@@ -23,8 +24,14 @@ class Hello extends CommandWithValidation {
     /**
      * @inheritDoc
      */
-    public function __construct () {
-        parent::__construct('hello', 'bonjour');
+    public function __construct (?string $name = null) {
+        parent::__construct($name ?? 'hello', 'bonjour');
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function checkRequirements (InputInterface $input, OutputInterface $output): void {
     }
 
     /**
@@ -55,7 +62,7 @@ class Hello extends CommandWithValidation {
      * @inheritDoc
      */
     protected function execute (InputInterface $input, OutputInterface $output): int {
-        $output->writeln('Command : ' . __CLASS__, OutputInterface::VERBOSITY_DEBUG);
+        $output->writeln('<info>Command : ' . __CLASS__ . '</info>', OutputInterface::VERBOSITY_DEBUG);
 
         $text = 'Hello';
         $repeat = $input->getOption('repeat');