Status.php

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<?php
namespace Magento\Framework\Module;

use Magento\Framework\App\DeploymentConfig\Writer;
use Magento\Framework\Config\File\ConfigFilePool;

class Status
{
    private $loader;

    private $list;

    private $writer;

    private $dependencyChecker;

    private $conflictChecker;

    public function __construct(
        ModuleList\Loader $loader,
        ModuleList $list,
        Writer $writer,
        ConflictChecker $conflictChecker,
        DependencyChecker $dependencyChecker
    ) {
        $this->loader = $loader;
        $this->list = $list;
        $this->writer = $writer;
        $this->conflictChecker = $conflictChecker;
        $this->dependencyChecker = $dependencyChecker;
    }

    public function checkConstraints(
        $isEnabled,
        $modulesToBeChanged,
        $currentlyEnabledModules = null,
        $prettyMessage = false
    ) {
        $errorMessages = [];
        if ($isEnabled) {
            $errorModulesDependency = $this->dependencyChecker->checkDependenciesWhenEnableModules(
                $modulesToBeChanged,
                $currentlyEnabledModules
            );
            $errorModulesConflict = $this->conflictChecker->checkConflictsWhenEnableModules(
                $modulesToBeChanged,
                $currentlyEnabledModules
            );
        } else {
            $errorModulesDependency = $this->dependencyChecker->checkDependenciesWhenDisableModules(
                $modulesToBeChanged,
                $currentlyEnabledModules
            );
            $errorModulesConflict = [];
        }

        foreach ($errorModulesDependency as $moduleName => $missingDependencies) {
            if (!empty($missingDependencies)) {
                if ($prettyMessage) {
                    $errorMessages[] = $this->createShortErrorMessage($isEnabled, $moduleName);
                } else {
                    $errorMessages = array_merge(
                        $errorMessages,
                        $this->createVerboseErrorMessage($isEnabled, $moduleName, $missingDependencies)
                    );
                }
            }
        }

        foreach ($errorModulesConflict as $moduleName => $conflictingModules) {
            if (!empty($conflictingModules)) {
                $errorMessages[] = "Cannot enable $moduleName because it conflicts with other modules:";
                $errorMessages[] = implode("\n", $conflictingModules);
            }
        }

        return $errorMessages;
    }

    public function setIsEnabled($isEnabled, $modules)
    {
        $result = [];
        foreach ($this->getAllModules($modules) as $name) {
            $currentStatus = $this->list->has($name);
            if (in_array($name, $modules)) {
                $result[$name] = (int)$isEnabled;
            } else {
                $result[$name] = (int)$currentStatus;
            }
        }
        $this->writer->saveConfig([ConfigFilePool::APP_CONFIG => ['modules' => $result]], true);
    }

    public function getModulesToChange($isEnabled, $modules)
    {
        $changed = [];
        foreach ($this->getAllModules($modules) as $name) {
            $currentStatus = $this->list->has($name);
            if (in_array($name, $modules)) {
                if ($isEnabled != $currentStatus) {
                    $changed[] = $name;
                }
            }
        }
        return $changed;
    }

    private function getAllModules($modules)
    {
        $all = $this->loader->load();
        $unknown = [];
        foreach ($modules as $name) {
            if (!isset($all[$name])) {
                $unknown[] = $name;
            }
        }
        if ($unknown) {
            throw new \LogicException("Unknown module(s): '" . implode("', '", $unknown) . "'");
        }
        return array_keys($all);
    }

    private function createShortErrorMessage($isEnabled, $moduleName)
    {
        if ($isEnabled) {
            return "Cannot enable $moduleName";
        } else {
            return "Cannot disable $moduleName";
        }
    }

    private function createVerboseErrorMessage($isEnabled, $moduleName, $missingDependencies)
    {
        if ($isEnabled) {
            $errorMessages[] = "Cannot enable $moduleName because it depends on disabled modules:";
        } else {
            $errorMessages[] = "Cannot disable $moduleName because modules depend on it:";
        }
        foreach ($missingDependencies as $errorModule => $path) {
            $errorMessages[] = "$errorModule: " . implode('->', $path);
        }
        return $errorMessages;
    }
}