Baseline implementation of MermaidJS Output Formatter - qossmic/deptrac#1372

config/services.php

@@ -104,6 +104,7 @@
 use Qossmic\Deptrac\Supportive\OutputFormatter\GraphVizOutputImageFormatter;
 use Qossmic\Deptrac\Supportive\OutputFormatter\JsonOutputFormatter;
 use Qossmic\Deptrac\Supportive\OutputFormatter\JUnitOutputFormatter;
+use Qossmic\Deptrac\Supportive\OutputFormatter\MermaidJSOutputFormatter;
 use Qossmic\Deptrac\Supportive\OutputFormatter\TableOutputFormatter;
 use Qossmic\Deptrac\Supportive\OutputFormatter\XMLOutputFormatter;
 use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
@@ -417,6 +418,9 @@
     $services
         ->set(CodeclimateOutputFormatter::class)
         ->tag('output_formatter');
+    $services
+        ->set(MermaidJSOutputFormatter::class)
+        ->tag('output_formatter');
 
     /*
      * Console

deptrac.config.php

@@ -8,6 +8,7 @@
 use Qossmic\Deptrac\Contract\Config\DeptracConfig;
 use Qossmic\Deptrac\Contract\Config\EmitterType;
 use Qossmic\Deptrac\Contract\Config\Formatter\GraphvizConfig;
+use Qossmic\Deptrac\Contract\Config\Formatter\MermaidJsConfig;
 use Qossmic\Deptrac\Contract\Config\Layer;
 use Qossmic\Deptrac\Contract\Config\Ruleset;
 use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
@@ -106,6 +107,11 @@
                 ->pointsToGroup(true)
                 ->groups('Contract', $contract)
                 ->groups('Supportive', $supportive, $file, $symfony, $console, $dependencyInjection, $outputFormatter, $time)
+                ->groups('Core', $analyser, $ast, $dependency, $inputCollector, $layer),
+            MermaidJsConfig::create()
+                ->direction('TD')
+                ->groups('Contract', $contract)
+                ->groups('Supportive', $supportive, $file, $symfony, $console, $dependencyInjection, $outputFormatter, $time)
                 ->groups('Core', $analyser, $ast, $dependency, $inputCollector, $layer)
         );
 };

deptrac.yaml

@@ -36,6 +36,24 @@ deptrac:
           - Dependency
           - InputCollector
           - Layer
+    mermaidjs:
+      direction: TD
+      groups:
+        Contract:
+          - Contract
+        Supportive:
+          - Supportive
+          - File
+        Symfony:
+          - Console
+          - DependencyInjection
+          - OutputFormatter
+        Core:
+          - Analyser
+          - Ast
+          - Dependency
+          - InputCollector
+          - Layer
 
   layers:
     # Domains

docs/formatters.md

@@ -141,6 +141,87 @@ Will produce the following graph:
 #### Pointing to groups instead of nodes
 With `formatters.graphviz.pointToGroups` set to `true`, when you have a node inside a groups with the same name as the group itself, edges pointing to that node will point to the group instead. This might be useful for example if you want to provide a "public API" for a module defined by a group.
 
+## MermaidJS Formatter
+
+The MermaidJS formatter is a console formatter, which generates a mermaid.js compatible graph definition. It can be activated with `--formatter=mermaidjs`.
+With the -o option you can specify the output file.
+
+Available options:
+
+```
+--formatter=mermaidjs
+--output= path to a dumped file
+```
+With this example
+Yaml Config:
+
+```yaml
+deptrac:
+  layers:
+    - User Frontend
+    - User Backend
+    - Admin Frontend
+    - Admin Backend
+  formatters:
+    mermaidjs:
+      direction: TD
+      groups:
+        User:
+          - User Frontend
+          - User Backend
+        Admin:
+          - Admin Frontend
+          - Admin Backend
+```
+
+This will produce the following graph:
+
+```mermaid
+flowchart TD;
+  subgraph ContractGroup;
+    Contract;
+  end;
+  subgraph SupportiveGroup;
+    Supportive;
+    File;
+  end;
+  subgraph SymfonyGroup;
+    Console;
+    DependencyInjection;
+    OutputFormatter;
+  end;
+  subgraph CoreGroup;
+    Analyser;
+    Ast;
+    Dependency;
+    InputCollector;
+    Layer;
+  end;
+    Contract -->|6| Symfony;
+    InputCollector -->|3| File;
+    InputCollector -->|7| Symfony;
+    Dependency -->|36| Ast;
+    Layer -->|68| Ast;
+    Layer -->|8| Symfony;
+    Analyser -->|18| Ast;
+    Analyser -->|23| Dependency;
+    Analyser -->|6| Layer;
+    Analyser -->|10| Symfony;
+    Ast -->|3| Symfony;
+    Ast -->|3| InputCollector;
+    Ast -->|7| File;
+    OutputFormatter -->|5| Symfony;
+    OutputFormatter -->|1| DependencyInjection;
+    File -->|9| Symfony;
+    DependencyInjection -->|37| Symfony;
+    Console -->|66| Symfony;
+    Console -->|2| DependencyInjection;
+    Console -->|16| Analyser;
+    Console -->|5| File;
+    Console -->|4| OutputFormatter;
+    Console -->|4| Time;
+```
+
 ## JSON Formatter
 
 By default, Json formatter dumps information to *STDOUT*. It can be activated

src/Contract/Config/Formatter/MermaidJsConfig.php

@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Qossmic\Deptrac\Contract\Config\Formatter;
+
+use Qossmic\Deptrac\Contract\Config\Layer;
+
+final class MermaidJsConfig implements FormatterConfigInterface
+{
+    private string $name = 'mermaidjs';
+
+    private string $direction = 'TD';
+
+    /** @var array<string, Layer[]> */
+    private array $groups = [];
+
+    public static function create(): self
+    {
+        return new self();
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    public function direction(string $direction): self
+    {
+        $this->direction = $direction;
+
+        return $this;
+    }
+
+    public function groups(string $name, Layer ...$layerConfigs): self
+    {
+        foreach ($layerConfigs as $layerConfig) {
+            $this->groups[$name][] = $layerConfig;
+        }
+
+        return $this;
+    }
+
+    public function toArray(): array
+    {
+        $output = [];
+
+        if ([] !== $this->groups) {
+            $output['groups'] = array_map(
+                static fn (array $configs) => array_map(static fn (Layer $layer) => $layer->name, $configs),
+                $this->groups
+            );
+        }
+
+        $output['direction'] = $this->direction;
+
+        return $output;
+    }
+}

src/Supportive/DependencyInjection/Configuration.php

@@ -176,6 +176,21 @@ private function appendFormatters(ArrayNodeDefinition $node): void
                                 })
                             ->end()
                         ->end()
+                        ->arrayNode('mermaidjs')
+                            ->info('Configure MermaidJS output formatter')
+                            ->addDefaultsIfNotSet()
+                            ->children()
+                                ->scalarNode('direction')->defaultValue('TD')
+                                ->end()
+                                ->arrayNode('groups')
+                                ->info('Combine multiple layers to a group')
+                                    ->useAttributeAsKey('name')
+                                    ->arrayPrototype()
+                                        ->scalarPrototype()->end()
+                                    ->end()
+                                ->end()
+                            ->end()
+                        ->end()
                         ->arrayNode('codeclimate')
                             ->addDefaultsIfNotSet()
                             ->info('Configure Codeclimate output formatters')

src/Supportive/OutputFormatter/MermaidJSOutputFormatter.php

@@ -0,0 +1,117 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Qossmic\Deptrac\Supportive\OutputFormatter;
+
+use Qossmic\Deptrac\Contract\OutputFormatter\OutputFormatterInput;
+use Qossmic\Deptrac\Contract\OutputFormatter\OutputFormatterInterface;
+use Qossmic\Deptrac\Contract\OutputFormatter\OutputInterface;
+use Qossmic\Deptrac\Contract\Result\OutputResult;
+use Qossmic\Deptrac\Supportive\OutputFormatter\Configuration\FormatterConfiguration;
+
+/**
+ * @internal
+ */
+final class MermaidJSOutputFormatter implements OutputFormatterInterface
+{
+    /** @var array{direction: string, groups: array<string, string[]>} */
+    private array $config;
+    private const GRAPH_TYPE = 'flowchart %s;';
+
+    private const GRAPH_END = '  end;';
+    private const SUBGRAPH = '  subgraph %sGroup;';
+    private const LAYER = '    %s;';
+    private const GRAPH_NODE_FORMAT = '    %s -->|%d| %s;';
+    private const VIOLATION_STYLE_FORMAT = '    linkStyle %d stroke:red,stroke-width:4px;';
+
+    public function __construct(FormatterConfiguration $config)
+    {
+        /** @var array{direction: string, groups: array<string, string[]>}  $extractedConfig */
+        $extractedConfig = $config->getConfigFor('mermaidjs');
+        $this->config = $extractedConfig;
+    }
+
+    public static function getName(): string
+    {
+        return 'mermaidjs';
+    }
+
+    public function finish(
+        OutputResult $result,
+        OutputInterface $output,
+        OutputFormatterInput $outputFormatterInput
+    ): void {
+        $graph = $this->parseResults($result);
+        $violations = $result->violations();
+        $buffer = '';
+
+        $buffer .= sprintf(self::GRAPH_TYPE.PHP_EOL, $this->config['direction']);
+
+        foreach ($this->config['groups'] as $subGraphName => $layers) {
+            $buffer .= sprintf(self::SUBGRAPH.PHP_EOL, $subGraphName);
+
+            foreach ($layers as $layer) {
+                $buffer .= sprintf(self::LAYER.PHP_EOL, $layer);
+            }
+
+            $buffer .= self::GRAPH_END.PHP_EOL;
+        }
+
+        $linkCount = 0;
+        $violationsLinks = [];
+        $violationGraphLinks = [];
+
+        foreach ($violations as $violation) {
+            if (!isset($violationsLinks[$violation->getDependerLayer()][$violation->getDependentLayer()])) {
+                $violationsLinks[$violation->getDependerLayer()][$violation->getDependentLayer()] = 1;
+            } else {
+                ++$violationsLinks[$violation->getDependerLayer()][$violation->getDependentLayer()];
+            }
+        }
+
+        foreach ($violationsLinks as $dependerLayer => $layers) {
+            foreach ($layers as $dependentLayer => $count) {
+                $buffer .= sprintf(self::GRAPH_NODE_FORMAT.PHP_EOL, $dependerLayer, $count, $dependentLayer);
+                $violationGraphLinks[] = $linkCount;
+                ++$linkCount;
+            }
+        }
+
+        foreach ($graph as $dependerLayer => $layers) {
+            foreach ($layers as $dependentLayer => $count) {
+                if (!isset($violationsLinks[$dependerLayer][$dependentLayer])) {
+                    $buffer .= sprintf(self::GRAPH_NODE_FORMAT.PHP_EOL, $dependerLayer, $count, $dependentLayer);
+                }
+            }
+        }
+
+        foreach ($violationGraphLinks as $linkNumber) {
+            $buffer .= sprintf(self::VIOLATION_STYLE_FORMAT.PHP_EOL, $linkNumber);
+        }
+
+        if (null !== $outputFormatterInput->outputPath) {
+            file_put_contents($outputFormatterInput->outputPath, $buffer);
+        } else {
+            $output->writeRaw($buffer);
+        }
+    }
+
+    /**
+     * @return array<string, array<string, int<1, max>>>
+     */
+    protected function parseResults(OutputResult $result): array
+    {
+        $graph = [];
+
+        foreach ($result->allowed() as $rule) {
+            if (!isset($graph[$rule->getDependerLayer()][$rule->getDependentLayer()])) {
+                $graph[$rule->getDependerLayer()][$rule->getDependentLayer()] = 1;
+            } else {
+                ++$graph[$rule->getDependerLayer()][$rule->getDependentLayer()];
+            }
+        }
+
+        return $graph;
+    }
+}

tests/Supportive/DependencyInjection/DeptracExtensionTest.php

@@ -24,6 +24,10 @@ final class DeptracExtensionTest extends TestCase
             'groups' => [],
             'point_to_groups' => false,
         ],
+        'mermaidjs' => [
+            'direction' => 'TD',
+            'groups' => [],
+        ],
         'codeclimate' => [
             'severity' => [
                 'failure' => 'major',