added command factory

Author: Alexsey-VR

composer.json

@@ -15,14 +15,7 @@
         },
         "files": [
             "vendor/docopt/docopt/src/docopt.php",
-            "src/Gendiff.php",
-            "src/CommandInterface.php",
-            "src/FilesDiffCommand.php",
-            "src/DisplayCommand.php",
-            "src/OutputInterface.php",
-            "src/Output.php",
-            "src/FileReaderInterface.php",
-            "src/FileReader.php"
+            "src/Gendiff.php"
         ]
     },
     "authors": [

src/CommandFactory.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Differ;
+
+class CommandFactory implements CommandFactoryInterface
+{
+    private string $docopt;
+
+    public function __construct(string $docopt = '')
+    {
+        $this->docopt = $docopt;
+    }
+
+    public function getCommand(string $commandType): CommandInterface | OutputInterface | null
+    {
+        if (!strcmp($commandType, "parse")) {
+            return new Output($this->docopt);
+        } elseif (!strcmp($commandType, "difference")) {
+            return new FilesDiffCommand();
+        } elseif (!strcmp($commandType, "show")) {
+            return new DisplayCommand();
+        }
+        return null;
+    }
+}

src/CommandFactoryInterface.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Differ;
+
+interface CommandFactoryInterface
+{
+    public function getCommand(string $commandType): CommandInterface | OutputInterface | null;
+}

src/DisplayCommand.php

@@ -11,6 +11,8 @@ public function __construct()
     {
         $this->filesContent = [];
         $this->filesDiffContent = [];
+
+        return $this;
     }
 
     private function constructContent($accum, $item)
@@ -25,20 +27,21 @@ public function execute(object $data): object
         $this->filesContent[] = array_reduce(
             get_object_vars($data)['file1'],
             [$this, 'constructContent'],
-            "{") . "\r}\n";
+            "{"
+        ) . "\r}\n";
 
         $this->filesContent[] = "file2.json content:\n";
         $this->filesContent[] = array_reduce(
             get_object_vars($data)['file2'],
             [$this, 'constructContent'],
-            "{") . "\n}\n";
+            "{"
+        ) . "\n}\n";
 
         $file1Array = get_object_vars($data)['file1'];
         $file1Keys = array_keys($file1Array);
         $file2Array = get_object_vars($data)['file2'];
         $this->filesDiffContent = array_map(
-            function($file1Key) use ($file1Array, $file2Array)
-            {
+            function ($file1Key) use ($file1Array, $file2Array) {
                 if (array_key_exists($file1Key, $file2Array)) {
                     if (!strcmp($file1Array[$file1Key], $file2Array[$file1Key])) {
                         return "    " . $file1Array[$file1Key] . "\n";
@@ -49,7 +52,8 @@ function($file1Key) use ($file1Array, $file2Array)
                 } else {
                     return "  - " . $file1Array[$file1Key] . "\n";
                 }
-            }, $file1Keys
+            },
+            $file1Keys
         );
         return $this;
     }

src/FilesDiffCommand.php

@@ -13,6 +13,8 @@ public function __construct()
     {
         $this->file1Content = [];
         $this->file2Content = [];
+
+        return $this;
     }
 
     public function setFileReader(FileReaderInterface $fileReader): object

src/Gendiff.php

@@ -22,14 +22,30 @@ function runGendiff(): void
 
     DOCOPT;
 
-    $output = new Output($docopt);
-    $cliData = $output->parseCommandData();
-
-    $filesDiffCommand = new FilesDiffCommand();
-    $filesContent = $filesDiffCommand->setFileReader(new FileReader())
-                                     ->execute($cliData);
-
-    $displayCommand = new DisplayCommand();
-    $displayCommand->execute((object)$filesContent)
-                   ->showDiffsToConsole();
+    $factory = new CommandFactory($docopt);
+
+    $outputParser = $factory->getCommand("parse");
+    if (is_null($outputParser)) {
+        print_r("error: can't create command to parse command data\n");
+    } else {
+        $cliData = $outputParser->parseCommandData();
+    }
+
+    $filesDiffCommand = $factory->getCommand("difference");
+    if (is_null($filesDiffCommand)) {
+        print_r("error: can't create command to get files difference\n");
+        exit;
+    } else {
+        $filesContent = $filesDiffCommand->setFileReader(new FileReader())
+                                         ->execute($cliData);
+    }
+
+    $displayCommand = $factory->getCommand("show");
+    if (is_null($displayCommand)) {
+        print_r("error: can't create command to show differences to console\n");
+        exit;
+    } else {
+        $displayCommand->execute((object)$filesContent)
+                       ->showDiffsToConsole();
+    }
 }

src/Output.php

@@ -15,6 +15,6 @@ public function __construct(string $docopt)
 
     public function parseCommandData(): object
     {
-        return (new Docopt)->handle($this->docopt, array('version' => '1.0.6'));
+        return (new Docopt())->handle($this->docopt, array('version' => '1.0.6'));
     }
 }