First prototype

.editorconfig

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+# EditorConfig is awesome: http://EditorConfig.org
+
+# Top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+# JS / PHP
+[*.{js,php,phpt}]
+charset = utf-8
+indent_style = tab
+indent_size = 4
+
+# Composer
+[{composer.json}]
+indent_style = space
+indent_size = 2

.gitignore

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+# IDE
+/.idea
+
+# Composer
+/vendor
+/composer.lock

README.md

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+Usage
+-----
+
+"scripts": {
+    "post-install-cmd": [
+        "Contributte\\Neonizer\\NeonizerExtension::process"
+    ],
+    "post-update-cmd": [
+        "Contributte\\Neonizer\\NeonizerExtension::process"
+    ]
+},
+"extra": {
+    "neonizer": [
+      {
+        "file": "files/config.neon"
+      }
+    ]
+}

composer.json

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+{
+  "name": "contributte/neonizer",
+  "description": "Neonizer",
+  "keywords": [
+    "nette"
+  ],
+  "type": "library",
+  "license": [
+    "MIT"
+  ],
+  "homepage": "https://github.com/contributte/migrations",
+  "authors": [
+    {
+      "name": "Milan Felix Sulc",
+      "homepage": "https://f3l1x.io"
+    }
+  ],
+  "require": {
+    "php": ">=5.6",
+    "nette/neon": "^2.4"
+  },
+  "require-dev": {
+    "ninjify/qa": "~0.4.0",
+    "ninjify/nunjuck": "~0.1.4",
+    "composer/composer": "^1.5",
+    "symfony/yaml": "^3.3"
+  },
+  "autoload": {
+    "psr-4": {
+      "Contributte\\Neonizer\\": "src/"
+    }
+  },
+  "scripts": {
+    "qa": [
+      "linter src tests",
+      "codesniffer src tests"
+    ],
+    "tester": [
+      "tester -s -p php --colors 1 -c tests/php-unix.ini tests/cases"
+    ],
+    "tester-coverage": [
+      "tester -s -p php --colors 1 -c tests/php-unix.ini -d extension=xdebug.so --coverage ./coverage.xml --coverage-src ./src tests/cases"
+    ],
+    "post-install-cmd": [
+      "Contributte\\Neonizer\\NeonizerExtension::process"
+    ],
+    "post-update-cmd": [
+      "Contributte\\Neonizer\\NeonizerExtension::process"
+    ]
+  },
+  "extra": {
+    "neonizer": {
+      "files": [
+        {
+          "dist-file": "files/config.neon.dist"
+        },
+        {
+          "dist-file": "files/config.neon.dist",
+          "file": "files/config.json"
+        }
+      ]
+    }
+  }
+}

files/config.neon.dist

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+user: root
+password: ""
+database:
+    name: dbname
+    section:
+        a: "Section A"
+        b: "Section B"
+        c:
+        d:

src/Config/FileConfig.php

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+<?php
+
+namespace Contributte\Neonizer\Config;
+
+use Contributte\Neonizer\Exception\InvalidArgumentException;
+use Contributte\Neonizer\Utils;
+
+class FileConfig
+{
+
+	/** @var string */
+	private $file;
+
+	/** @var string */
+	private $distFile;
+
+	/** @var string|NULL */
+	private $sourceType;
+
+	/** @var string|NULL */
+	private $outputType;
+
+	/**
+	 * @param mixed[] $config
+	 */
+	public function __construct(array $config)
+	{
+		// Dist file
+		if (empty($config['dist-file']))
+			throw new InvalidArgumentException(
+				'The dist-file name is required'
+			);
+		$this->distFile = $config['dist-file'];
+		if (!is_file($this->distFile))
+			throw new InvalidArgumentException(
+				sprintf(
+					'The dist file "%s" does not exist. Check your dist-file config or create it.',
+					$this->distFile
+				)
+			);
+
+		// File
+		if (!empty($config['file']))
+			$this->file = $config['file'];
+		if (!$this->file)
+			$this->file = Utils::removeDistExtensions($this->distFile);
+
+		// Source & output type
+		if (!$this->sourceType)
+			$this->sourceType = Utils::detectFileType($this->distFile);
+		if (!$this->outputType)
+			$this->outputType = Utils::detectFileType($this->file);
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getFile()
+	{
+		return $this->file;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getDistFile()
+	{
+		return $this->distFile;
+	}
+
+	/**
+	 * @return string|NULL
+	 */
+	public function getSourceType()
+	{
+		return $this->sourceType;
+	}
+
+	/**
+	 * @return string|NULL
+	 */
+	public function getOutputType()
+	{
+		return $this->outputType;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isFileExist()
+	{
+		return is_file($this->file);
+	}
+
+}

src/Decoder/DecoderFactory.php

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+<?php
+
+namespace Contributte\Neonizer\Decoder;
+
+use Contributte\Neonizer\Exception\InvalidArgumentException;
+
+class DecoderFactory implements IDecoderFactory
+{
+
+	/** @var string[] */
+	private $decodersMap = [
+		'json' => JsonDecoder::class,
+		'neon' => NeonDecoder::class,
+	];
+
+	/** @var IDecoder[] */
+	private $decoders = [];
+
+	/**
+	 * @param string|NULL $type
+	 * @return IDecoder
+	 */
+	public function create($type)
+	{
+		if (isset($this->decoders[$type])) {
+			return $this->decoders[$type];
+		}
+
+		if (isset($this->decodersMap[$type])) {
+			$this->decoders[$type] = new $this->decodersMap[$type];
+			return $this->create($type);
+		}
+
+		throw new InvalidArgumentException('Missing Decoder type ' . (string) $type);
+	}
+
+}

src/Decoder/IDecoder.php

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+<?php
+
+namespace Contributte\Neonizer\Decoder;
+
+interface IDecoder
+{
+
+	/**
+	 * @param string $value
+	 * @return mixed[]
+	 */
+	public function decode($value);
+
+}

src/Decoder/IDecoderFactory.php

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+<?php
+
+namespace Contributte\Neonizer\Decoder;
+
+interface IDecoderFactory
+{
+
+	/**
+	 * @param string|NULL $type
+	 * @return IDecoder
+	 */
+	public function create($type);
+
+}

src/Decoder/JsonDecoder.php

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+<?php
+
+namespace Contributte\Neonizer\Decoder;
+
+class JsonDecoder implements IDecoder
+{
+
+	/**
+	 * @param string $value
+	 * @return mixed[]
+	 */
+	public function decode($value)
+	{
+		return json_decode($value, TRUE);
+	}
+
+}

src/Decoder/NeonDecoder.php

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+<?php
+
+namespace Contributte\Neonizer\Decoder;
+
+use Nette\Neon\Neon;
+
+class NeonDecoder implements IDecoder
+{
+
+	/**
+	 * @param string $value
+	 * @return mixed[]
+	 */
+	public function decode($value)
+	{
+		return Neon::decode($value);
+	}
+
+}

src/Encoder/EncoderFactory.php

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+<?php
+
+namespace Contributte\Neonizer\Encoder;
+
+use Contributte\Neonizer\Exception\InvalidArgumentException;
+
+class EncoderFactory implements IEncoderFactory
+{
+
+	/** @var string[] */
+	private $encodersMap = [
+		'json' => JsonEncoder::class,
+		'neon' => NeonEncoder::class,
+	];
+
+	/** @var IEncoder[] */
+	private $encoders = [];
+
+	/**
+	 * @param string|NULL $type
+	 * @return IEncoder
+	 */
+	public function create($type)
+	{
+		if (isset($this->encoders[$type])) {
+			return $this->encoders[$type];
+		}
+
+		if (isset($this->encodersMap[$type])) {
+			$this->encoders[$type] = new $this->encodersMap[$type];
+			return $this->create($type);
+		}
+
+		throw new InvalidArgumentException('Missing Encoder type ' . (string) $type);
+	}
+
+}

src/Encoder/IEncoder.php

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+<?php
+
+namespace Contributte\Neonizer\Encoder;
+
+interface IEncoder
+{
+
+	const GENERATED_MESSAGE = 'This file is auto-generated by composer';
+
+	/**
+	 * @param mixed[] $value
+	 * @return string|NULL
+	 */
+	public function encode($value);
+
+}

src/Encoder/IEncoderFactory.php

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+<?php
+
+namespace Contributte\Neonizer\Encoder;
+
+interface IEncoderFactory
+{
+
+	/**
+	 * @param string|NULL $type
+	 * @return IEncoder
+	 */
+	public function create($type);
+
+}