yay

#!/usr/bin/env php
<?php declare(strict_types=1);

use Yay\{Engine, YayPreprocessorError};

set_error_handler(function($errno, $errstr) {
    throw new Exception($errstr, $errno);
});

(function(){
    $autoloads = [
        __DIR__ . '/../../../autoload.php', // as dependency
        __DIR__ . '/../vendor/autoload.php', // as main package
    ];

    foreach ($autoloads as $file) if (file_exists($file) && is_readable($file)) {
        require_once($file);

        return;
    }

    throw new Exception('Could not find autoload file. Check your composer installation.');
})();

try {

$doc = <<<DOC
YAY!

Usage:
  yay
  yay <file>
  yay --macros=<macros>
  yay --macros=<macros> <file>
  yay -h | --help
  yay --version

Options:
  -h --help         Show this screen.
  --version         Show version.
  --macros=<macros> PHP glob pattern for macros to be loaded. Ex: my/macros/*.yay [default: '']

Examples:

``` 
# Process file:
yay input.php > output.php

# Process file, preload project macros:
> yay --macros="./project-macros/*.yay" input.php > output.php

# Process stdin:
> cat input.php | yay > output.php

# Process stdin, preload project macros:
> cat input.php | yay --macros="./project-macros/*.yay" > output.php
```
DOC;

    $argv = Docopt::handle($doc, include __DIR__ . '/../meta.php');

    $file = $argv['<file>'] ?? 'php://stdin';

    $source = file_get_contents($file);

    $engine = new Engine;

    gc_disable();

    foreach(glob((string) $argv['--macros']) as $f) $engine->expand(file_get_contents($f), $f);

    $expansion = $engine->expand($source, $file);

    gc_enable();

    file_put_contents('php://stdout', $expansion);
}
catch (YayPreprocessorError $e) {
    file_put_contents('php://stderr', $e . PHP_EOL);
}
catch (Exception $e) {
    file_put_contents('php://stderr', $e . PHP_EOL);
}