graph-deps.php

<?php

$files = $argv;
unset($files[0]);

$packages = [];
foreach ($files as $file) {
    $composer = json_decode(file_get_contents($file), true);

    $requirements = $composer['require'];
    $packages[$composer['name']] = array_keys($composer['require']);
}


$template = function($packages) {
    $colors = ['red', 'green', 'blue', 'deeppink1', 'gold2', 'chartreuse'];
    $result = '';
    $i = 0;
    foreach ($packages as $name => $deps) {
        $color = $colors[$i];
        $result .= sprintf("\n  \"%s\" [color = %s]", $name, $color);
        foreach ($deps as $dep) {
            $result .= sprintf("\n  \"%s\" -> \"%s\" [color = %s]", $name, $dep, $color);
        }
        ++$i;
    }

    return $result;
};

printf("digraph deps {\n  rankdir=\"LR\"%s\n}", $template($packages));