README

Phalanx Archon

Part of the Phalanx async PHP framework.

Build CLI applications with the same scope-driven concurrency that powers Phalanx HTTP servers. Define commands as invokable classes, group them, load them from directories, and let the framework handle argument parsing, validation, and help generation.

Installation
Quick Start
Defining Commands
Command Configuration
Arguments and Options
Grouping Commands
Nested Command Groups
Loading Commands from Files
Validation
The CommandScope
Running Concurrent Work

Installation

composer require phalanx/archon

Note

Requires PHP 8.4 or later.

Quick Start

<?php

use Phalanx\Application;
use Phalanx\Archon\Arg;
use Phalanx\Archon\CommandConfig;
use Phalanx\Archon\CommandGroup;
use Phalanx\Archon\CommandScope;
use Phalanx\Archon\ConsoleRunner;
use Phalanx\Scope;
use Phalanx\Task\Scopeable;

final class GreetCommand implements Scopeable
{
    public function __invoke(Scope $scope): mixed
    {
        /** @var CommandScope $scope */
        $name = $scope->args->get('name', 'world');
        echo "Hello, {$name}!\n";

        return 0;
    }
}

$app = Application::starting()->compile();

$commands = CommandGroup::of([
    'greet' => [GreetCommand::class, new CommandConfig(
        description: 'Greet someone by name',
        arguments: [Arg::optional('name', 'Name to greet', default: 'world')],
    )],
]);

$runner = ConsoleRunner::withCommands($app, $commands);
exit($runner->run($argv));

$ php app.php greet Jonathan
Hello, Jonathan!

Defining Commands

A command handler is an invokable class implementing Scopeable or Executable. At dispatch time the HandlerResolver constructs the handler with its constructor dependencies injected from the service container, then passes a CommandScope to __invoke.

Scopeable handlers receive Scope and use it for service resolution:

<?php

use Phalanx\Archon\CommandScope;
use Phalanx\Scope;
use Phalanx\Task\Scopeable;

final class RunMigrations implements Scopeable
{
    public function __construct(
        private readonly MigrationRunner $migrations,
    ) {}

    public function __invoke(Scope $scope): mixed
    {
        /** @var CommandScope $scope */
        $fresh = $scope->options->flag('fresh');
        $dry = $scope->options->flag('dry-run');

        $pending = $this->migrations->pending();

        foreach ($pending as $migration) {
            if ($dry) {
                echo "[dry-run] Would apply: {$migration->name}\n";
                continue;
            }
            $this->migrations->run($migration);
            echo "Applied: {$migration->name}\n";
        }

        return 0;
    }
}

Executable handlers receive ExecutionScope directly -- use this when the command needs concurrency primitives like concurrent() or map():

<?php

use Phalanx\Archon\CommandScope;
use Phalanx\ExecutionScope;
use Phalanx\Task\Executable;

final class PingCommand implements Executable
{
    public function __invoke(ExecutionScope $scope): mixed
    {
        /** @var CommandScope $scope */
        echo "pong\n";

        return 0;
    }
}

Constructors take repositories, clients, and services. Pure helpers that don't need sharing stay as direct calls inside __invoke.

Command Configuration

Register commands in a CommandGroup using class-strings. When a command needs description, arguments, options, or validators, pair the class-string with a CommandConfig:

<?php

use Phalanx\Archon\Arg;
use Phalanx\Archon\CommandConfig;
use Phalanx\Archon\CommandGroup;
use Phalanx\Archon\Opt;

$commands = CommandGroup::of([
    'migrate' => [RunMigrations::class, new CommandConfig(
        description: 'Run pending database migrations',
        arguments: [Arg::required('database', 'Connection name')],
        options: [
            Opt::value('step', 's', 'Number of migrations to run', default: 'all'),
            Opt::flag('dry-run', 'd', 'Preview without applying'),
            Opt::flag('force', 'f', 'Skip confirmation prompts'),
        ],
    )],
]);

Arguments and Options

Arg factory

<?php

use Phalanx\Archon\Arg;

Arg::required('name', 'Description');
Arg::optional('name', 'Description', default: 'fallback');

Positional arguments are matched by declaration order, accessed by name:

<?php

$scope->args->get('name');            // value or null
$scope->args->get('name', 'default'); // value or default
$scope->args->required('name');       // value or throws InvalidInputException
$scope->args->has('name');            // bool
$scope->args->all();                  // array<string, mixed>

Opt factory

<?php

use Phalanx\Archon\Opt;

Opt::flag('verbose', 'v', 'Enable verbose output');           // --verbose / -v (boolean)
Opt::value('format', 'f', 'Output format', default: 'json');  // --format=json / -f json (requires value)

Options are parsed from --long, -s, --long=value, and -s value forms. -- stops option parsing—everything after is positional:

<?php

$scope->options->get('format');            // value or null
$scope->options->get('format', 'json');    // value or default
$scope->options->flag('verbose');          // bool
$scope->options->has('format');            // bool
$scope->options->all();                    // array<string, mixed>

Grouping Commands

CommandGroup collects commands into a registry. Commands without extra config are registered as bare class-strings; commands that need metadata use the [class-string, CommandConfig] tuple form:

<?php

use Phalanx\Archon\CommandGroup;

$commands = CommandGroup::of([
    'deploy'  => DeployApplication::class,
    'migrate' => RunMigrations::class,
    'seed'    => SeedDatabase::class,
]);

// Merge groups together
$all = $coreCommands->merge($pluginCommands);

Nested Command Groups

Groups can contain other groups for hierarchical CLI structures:

<?php

use Phalanx\Archon\Arg;
use Phalanx\Archon\CommandConfig;
use Phalanx\Archon\CommandGroup;
use Phalanx\Archon\Opt;

$commands = CommandGroup::of([
    'serve' => [ServeHttp::class, new CommandConfig(
        description: 'Start the HTTP server',
        options: [Opt::value('port', 'p', 'Port number', default: '8080')],
    )],
    'db' => CommandGroup::of([
        'migrate' => [RunMigrations::class, new CommandConfig(
            description: 'Run database migrations',
            options: [Opt::flag('fresh', 'f', 'Drop all tables first')],
        )],
        'seed' => [SeedDatabase::class, new CommandConfig(
            description: 'Seed the database',
            arguments: [Arg::optional('class', 'Seeder class')],
        )],
        'reset' => [ResetDatabase::class, new CommandConfig(
            description: 'Reset the database',
        )],
    ], description: 'Database operations'),
    'make' => CommandGroup::of([
        'task'    => [MakeTask::class, new CommandConfig(description: 'Create a new task class')],
        'command' => [MakeCommand::class, new CommandConfig(description: 'Create a new command class')],
    ], description: 'Code generation'),
]);

Invoke nested commands with space-separated names:

php app.php serve --port=8080
php app.php db migrate --fresh
php app.php make task FetchUser
php app.php db --help

Typing a group name without a subcommand shows its help:

Database operations

Usage:
  db <command> [options]

Commands:
  migrate  Run database migrations
  seed     Seed the database
  reset    Reset the database

Run 'db <command> --help' for details.

Top-level help separates commands from groups:

Usage:
  app <command> [options]

Commands:
  serve   Start the HTTP server

Groups:
  db      Database operations
  make    Code generation

Groups nest arbitrarily deep. Both flat commands and nested groups work in the same CommandGroup.

Loading Commands from Files

CommandLoader loads command definitions from PHP files that return a CommandGroup:

<?php

// commands/db.php
use Phalanx\Archon\Arg;
use Phalanx\Archon\CommandConfig;
use Phalanx\Archon\CommandGroup;
use Phalanx\Archon\Opt;

return CommandGroup::of([
    'migrate' => [RunMigrations::class, new CommandConfig(
        description: 'Run database migrations',
        options: [Opt::flag('fresh', 'f', 'Drop all tables first')],
    )],
    'seed' => [SeedDatabase::class, new CommandConfig(
        description: 'Seed the database',
    )],
]);

Load a single file or scan an entire directory:

<?php

use Phalanx\Archon\CommandLoader;

// Single file
$commands = CommandLoader::load(__DIR__ . '/commands/db.php');

// All .php files in a directory (non-recursive, merged)
$commands = CommandLoader::loadDirectory(__DIR__ . '/commands');

ConsoleRunner accepts directory paths directly and handles loading:

<?php

use Phalanx\Archon\ConsoleRunner;

// From a CommandGroup
$runner = ConsoleRunner::withCommands($app, $commands);

// From a directory path
$runner = ConsoleRunner::withCommands($app, __DIR__ . '/commands');

// From multiple directories
$runner = ConsoleRunner::withCommands($app, [
    __DIR__ . '/commands',
    __DIR__ . '/plugins/commands',
]);

exit($runner->run($argv));

Validation

Implement CommandValidator to add custom input validation. Validators run after parsing, before the handler executes:

<?php

use Phalanx\Archon\CommandConfig;
use Phalanx\Archon\CommandInput;
use Phalanx\Archon\CommandValidator;
use Phalanx\Archon\InvalidInputException;

final readonly class RequireForceOnProduction implements CommandValidator
{
    public function validate(CommandInput $input, CommandConfig $config): void
    {
        $env = $input->args->get('environment');
        $force = $input->options->flag('force');

        if ($env === 'production' && !$force) {
            throw new InvalidInputException(
                'Production deployments require --force',
                $config,
            );
        }
    }
}

Attach validators via CommandConfig:

<?php

use Phalanx\Archon\Arg;
use Phalanx\Archon\CommandConfig;
use Phalanx\Archon\CommandGroup;
use Phalanx\Archon\Opt;

$commands = CommandGroup::of([
    'deploy' => [DeployApplication::class, new CommandConfig(
        description: 'Deploy the application',
        arguments: [Arg::required('environment', 'Target environment')],
        options: [Opt::flag('force', 'f', 'Skip confirmation prompts')],
        validators: [new RequireForceOnProduction()],
    )],
]);

When an InvalidInputException carries a CommandConfig, the runner automatically prints contextual help alongside the error message.

The CommandScope

CommandScope extends ExecutionScope with typed property hooks for the matched command:

<?php

interface CommandScope extends ExecutionScope
{
    public string $commandName { get; }
    public CommandArgs $args { get; }
    public CommandOptions $options { get; }
    public CommandConfig $config { get; }
}

Inside a handler, access everything through the scope:

<?php

public function __invoke(Scope $scope): mixed
{
    /** @var CommandScope $scope */

    $scope->commandName;                     // 'migrate'
    $scope->args->get('database');           // positional arg value
    $scope->options->flag('force');          // boolean flag
    $scope->options->get('step', 'all');     // option with default
    $scope->config;                          // CommandConfig instance

    $scope->service(Migrations::class);      // resolve a service
    $scope->execute($task);                  // execute a task in scope
    $scope->concurrent([...]);               // run tasks concurrently

    return 0;
}

Running Concurrent Work

Because CommandScope extends ExecutionScope, every command has access to Phalanx's concurrency primitives. A CLI tool that checks multiple services concurrently:

<?php

use Phalanx\Archon\CommandScope;
use Phalanx\ExecutionScope;
use Phalanx\Task;
use Phalanx\Task\Executable;

final class HealthCheckCommand implements Executable
{
    public function __construct(
        private readonly HealthChecker $checker,
    ) {}

    public function __invoke(ExecutionScope $scope): mixed
    {
        /** @var CommandScope $scope */
        $services = ['api', 'database', 'cache', 'queue'];

        $results = $scope->concurrent(
            array_map(
                fn(string $name) => Task::of(
                    static fn() => $this->checker->check($name)
                ),
                $services,
            ),
        );

        foreach ($services as $i => $name) {
            $status = $results[$i] ? 'OK' : 'FAIL';
            echo "  {$name}: {$status}\n";
        }

        return array_any($results, static fn($r) => !$r) ? 1 : 0;
    }
}

<?php

use Phalanx\Archon\CommandConfig;
use Phalanx\Archon\CommandGroup;

$commands = CommandGroup::of([
    'health' => [HealthCheckCommand::class, new CommandConfig(
        description: 'Check health of all services',
    )],
]);

All concurrency runs on the ReactPHP event loop under the hood. The command handler reads like synchronous code.

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