added files parsing and print content

Author: Alexsey-VR

file1.json

@@ -0,0 +1,6 @@
+{
+  "host": "hexlet.io",
+  "timeout": 50,
+  "proxy": "123.234.53.22",
+  "follow": false
+}

file2.json

@@ -0,0 +1,5 @@
+{
+  "timeout": 20,
+  "verbose": true,
+  "host": "hexlet.io"
+}

src/Gendiff.php

@@ -4,7 +4,18 @@
 
 use Docopt;
 
-function runGendiff()
+function parseFile(string $filename): array
+{
+    $handle = fopen($filename, "r");
+    $result = json_decode(fread($handle, 4096));
+    fclose($handle);
+
+    $keys = (get_object_vars($result));
+
+    return $keys;
+}
+
+function runGendiff(): void
 {
     $doc = <<<'DOCOPT'
     gendiff -h
@@ -14,6 +25,7 @@ function runGendiff()
     Usage:
       gendiff (-h|--help)
       gendiff (-v|--version)
+      gendiff [Options]... FILE1 FILE2
 
     Options:
       -h --help                  Show this screen
@@ -22,9 +34,26 @@ function runGendiff()
 
     DOCOPT;
 
-    $result = Docopt::handle($doc, array('version' => '1.0.6'));
-
-    foreach ($result as $k => $v) {
+    $cliData = Docopt::handle($doc, array('version' => '1.0.6'));
+/*
+    foreach ($cliData as $k => $v) {
         print_r($k . ': ' . json_encode($v) . PHP_EOL);
     }
+*/
+    if (file_exists($cliData['FILE1'])) {
+        if (file_exists($cliData['FILE2'])) {
+            $file1Content = parseFile($cliData['FILE1']);
+            $file2Content = parseFile($cliData['FILE2']);
+
+            print_r("File1 content:\n");
+            print_r($file1Content);
+            print_r("File2 content:\n");
+            print_r($file2Content);
+        } else {
+            print_r("File {$cliData['FILE2']} not exists");
+        }
+    } else {
+        print_r("File {$cliData['FILE1']} not exists\n");
+        runGendiff();
+    }
 }