diff --git a/.docker/docker-compose.yml b/.docker/docker-compose.yml
new file mode 100644
index 0000000..faad444
--- /dev/null
+++ b/.docker/docker-compose.yml
@@ -0,0 +1,9 @@
+version: "3"
+
+services:
+  php:
+    build: ./images/php
+    image: intraworlds/workshop-php
+    working_dir: /usr/src
+    volumes:
+      - ..:/usr/src
diff --git a/.docker/images/php/Dockerfile b/.docker/images/php/Dockerfile
new file mode 100644
index 0000000..29d16c1
--- /dev/null
+++ b/.docker/images/php/Dockerfile
@@ -0,0 +1,11 @@
+FROM php:7.2-cli-alpine
+
+MAINTAINER Zdeněk Zahoř <zdenek.zahor@gmail.com>
+
+RUN \
+    apk update && \
+    apk add autoconf g++ make && \
+    pecl install xdebug && \
+    docker-php-ext-enable xdebug && \
+    # TODO Optimalizovat image
+    curl --silent --location https://raw.githubusercontent.com/composer/getcomposer.org/master/web/installer | php -- --install-dir=/usr/local/bin --filename=composer
diff --git a/README.md b/README.md
index 256b55f..c0a724f 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 ### Zadání
-Napiště "univerzální" program, který přečte libovolně dlouhý textový soubor.
+Napište "univerzální" program, který přečte libovolně dlouhý textový soubor.
 Řádek po řádku bude aplikovat uživatelské filtry a dekorátory. Výstupem programu
 bude počet stejných (upravených) řádků a jejich četností.
 
@@ -15,11 +15,22 @@ Upravte program tak, aby vypisoval průběžný stav nekonečného streamu.
 ### Řešení
 Bude zveřejněno během workshopu ve středu 28.3.2018. Přijďte :-)
 
-### Příklad
+### Příklady
 ```bash
 php old.php example.log
 ```
 
+```bash
+cd .docker
+docker-compose run --rm php composer install
+docker-compose run --rm php php bin/console.php process-file example.log
+```
+
+#### Testy
+```bash
+docker-compose run --rm php composer tests
+```
+
 #### Vstupní soubor
 ```
 [2018-03-13 12:16:10] test.DEBUG: Test message [] []
diff --git a/bin/console.php b/bin/console.php
new file mode 100644
index 0000000..4ac35c6
--- /dev/null
+++ b/bin/console.php
@@ -0,0 +1,14 @@
+#!/usr/bin/env php
+<?php
+declare(strict_types=1);
+
+use Symfony\Component\Console\Application;
+use ZdenekZahor\IntraWorldsFileProcessor\Cli\Command\ProcessFileCommand;
+
+require_once __DIR__ . '/../vendor/autoload.php';
+
+$application = new Application();
+
+$application->add(new ProcessFileCommand());
+
+$application->run();
diff --git a/composer.json b/composer.json
index 3b0b111..052475b 100644
--- a/composer.json
+++ b/composer.json
@@ -1,5 +1,19 @@
 {
+    "scripts": {
+        "tests": [
+            "phpunit tests"
+        ]
+    },
+    "require": {
+        "symfony/console": "~4.0.6"
+    },
     "require-dev": {
-        "monolog/monolog": "^1.23"
+        "monolog/monolog": "^1.23",
+        "phpunit/phpunit": "^7"
+    },
+    "autoload": {
+        "psr-4": {
+            "ZdenekZahor\\IntraWorldsFileProcessor\\": "src/"
+        }
     }
 }
diff --git a/composer.lock b/composer.lock
index 9d272a7..83d8916 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,9 +4,191 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "bf92ea5aa6f40eb8907e803c72314b6e",
-    "packages": [],
+    "content-hash": "f858fa4a9bc86e9f562518b6e1d6ea2e",
+    "packages": [
+        {
+            "name": "symfony/console",
+            "version": "v4.0.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/console.git",
+                "reference": "555c8dbe0ae9e561740451eabdbed2cc554b6a51"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/console/zipball/555c8dbe0ae9e561740451eabdbed2cc554b6a51",
+                "reference": "555c8dbe0ae9e561740451eabdbed2cc554b6a51",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1.3",
+                "symfony/polyfill-mbstring": "~1.0"
+            },
+            "conflict": {
+                "symfony/dependency-injection": "<3.4",
+                "symfony/process": "<3.3"
+            },
+            "require-dev": {
+                "psr/log": "~1.0",
+                "symfony/config": "~3.4|~4.0",
+                "symfony/dependency-injection": "~3.4|~4.0",
+                "symfony/event-dispatcher": "~3.4|~4.0",
+                "symfony/lock": "~3.4|~4.0",
+                "symfony/process": "~3.4|~4.0"
+            },
+            "suggest": {
+                "psr/log": "For using the console logger",
+                "symfony/event-dispatcher": "",
+                "symfony/lock": "",
+                "symfony/process": ""
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Console\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Console Component",
+            "homepage": "https://symfony.com",
+            "time": "2018-02-26T15:55:47+00:00"
+        },
+        {
+            "name": "symfony/polyfill-mbstring",
+            "version": "v1.7.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-mbstring.git",
+                "reference": "78be803ce01e55d3491c1397cf1c64beb9c1b63b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/78be803ce01e55d3491c1397cf1c64beb9c1b63b",
+                "reference": "78be803ce01e55d3491c1397cf1c64beb9c1b63b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "suggest": {
+                "ext-mbstring": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.7-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Mbstring\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for the Mbstring extension",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "mbstring",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "time": "2018-01-30T19:27:44+00:00"
+        }
+    ],
     "packages-dev": [
+        {
+            "name": "doctrine/instantiator",
+            "version": "1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/instantiator.git",
+                "reference": "185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda",
+                "reference": "185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1"
+            },
+            "require-dev": {
+                "athletic/athletic": "~0.1.8",
+                "ext-pdo": "*",
+                "ext-phar": "*",
+                "phpunit/phpunit": "^6.2.3",
+                "squizlabs/php_codesniffer": "^3.0.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.2.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com",
+                    "homepage": "http://ocramius.github.com/"
+                }
+            ],
+            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
+            "homepage": "https://github.com/doctrine/instantiator",
+            "keywords": [
+                "constructor",
+                "instantiate"
+            ],
+            "time": "2017-07-22T11:58:36+00:00"
+        },
         {
             "name": "monolog/monolog",
             "version": "1.23.0",
@@ -86,21 +268,171 @@
             "time": "2017-06-19T01:22:40+00:00"
         },
         {
-            "name": "psr/log",
-            "version": "1.0.2",
+            "name": "myclabs/deep-copy",
+            "version": "1.7.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-fig/log.git",
-                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d"
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/log/zipball/4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
-                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e",
+                "reference": "3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.0"
+                "php": "^5.6 || ^7.0"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.0",
+                "doctrine/common": "^2.6",
+                "phpunit/phpunit": "^4.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                },
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "time": "2017-10-19T19:58:43+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/2df402786ab5368a0169091f61a7c1e0eb6852d0",
+                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-phar": "*",
+                "phar-io/version": "^1.0.1",
+                "php": "^5.6 || ^7.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "time": "2017-03-05T18:14:27+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "a70c0ced4be299a63d32fa96d9281d03e94041df"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/a70c0ced4be299a63d32fa96d9281d03e94041df",
+                "reference": "a70c0ced4be299a63d32fa96d9281d03e94041df",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.6 || ^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "time": "2017-03-05T17:38:23+00:00"
+        },
+        {
+            "name": "phpdocumentor/reflection-common",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6"
             },
             "type": "library",
             "extra": {
@@ -110,7 +442,9 @@
             },
             "autoload": {
                 "psr-4": {
-                    "Psr\\Log\\": "Psr/Log/"
+                    "phpDocumentor\\Reflection\\": [
+                        "src"
+                    ]
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -119,18 +453,1266 @@
             ],
             "authors": [
                 {
-                    "name": "PHP-FIG",
-                    "homepage": "http://www.php-fig.org/"
+                    "name": "Jaap van Otterdijk",
+                    "email": "opensource@ijaap.nl"
                 }
             ],
-            "description": "Common interface for logging libraries",
-            "homepage": "https://github.com/php-fig/log",
+            "description": "Common reflection classes used by phpdocumentor to reflect the code structure",
+            "homepage": "http://www.phpdoc.org",
             "keywords": [
-                "log",
-                "psr",
-                "psr-3"
+                "FQSEN",
+                "phpDocumentor",
+                "phpdoc",
+                "reflection",
+                "static analysis"
             ],
-            "time": "2016-10-10T12:19:37+00:00"
+            "time": "2017-09-11T18:02:19+00:00"
+        },
+        {
+            "name": "phpdocumentor/reflection-docblock",
+            "version": "4.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
+                "reference": "94fd0001232e47129dd3504189fa1c7225010d08"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/94fd0001232e47129dd3504189fa1c7225010d08",
+                "reference": "94fd0001232e47129dd3504189fa1c7225010d08",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0",
+                "phpdocumentor/reflection-common": "^1.0.0",
+                "phpdocumentor/type-resolver": "^0.4.0",
+                "webmozart/assert": "^1.0"
+            },
+            "require-dev": {
+                "doctrine/instantiator": "~1.0.5",
+                "mockery/mockery": "^1.0",
+                "phpunit/phpunit": "^6.4"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "phpDocumentor\\Reflection\\": [
+                        "src/"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mike van Riel",
+                    "email": "me@mikevanriel.com"
+                }
+            ],
+            "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
+            "time": "2017-11-30T07:14:17+00:00"
+        },
+        {
+            "name": "phpdocumentor/type-resolver",
+            "version": "0.4.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/TypeResolver.git",
+                "reference": "9c977708995954784726e25d0cd1dddf4e65b0f7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/9c977708995954784726e25d0cd1dddf4e65b0f7",
+                "reference": "9c977708995954784726e25d0cd1dddf4e65b0f7",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.5 || ^7.0",
+                "phpdocumentor/reflection-common": "^1.0"
+            },
+            "require-dev": {
+                "mockery/mockery": "^0.9.4",
+                "phpunit/phpunit": "^5.2||^4.8.24"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "phpDocumentor\\Reflection\\": [
+                        "src/"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mike van Riel",
+                    "email": "me@mikevanriel.com"
+                }
+            ],
+            "time": "2017-07-14T14:27:02+00:00"
+        },
+        {
+            "name": "phpspec/prophecy",
+            "version": "1.7.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpspec/prophecy.git",
+                "reference": "dfd6be44111a7c41c2e884a336cc4f461b3b2401"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/dfd6be44111a7c41c2e884a336cc4f461b3b2401",
+                "reference": "dfd6be44111a7c41c2e884a336cc4f461b3b2401",
+                "shasum": ""
+            },
+            "require": {
+                "doctrine/instantiator": "^1.0.2",
+                "php": "^5.3|^7.0",
+                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0",
+                "sebastian/comparator": "^1.1|^2.0",
+                "sebastian/recursion-context": "^1.0|^2.0|^3.0"
+            },
+            "require-dev": {
+                "phpspec/phpspec": "^2.5|^3.2",
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.7.x-dev"
+                }
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+                }
+            ],
+            "description": "Provides functionality to handle HHVM/PHP environments",
+            "homepage": "http://www.github.com/sebastianbergmann/environment",
+            "keywords": [
+                "Xdebug",
+                "environment",
+                "hhvm"
+            ],
+            "time": "2017-07-01T08:51:00+00:00"
+        },
+        {
+            "name": "sebastian/exporter",
+            "version": "3.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/exporter.git",
+                "reference": "234199f4528de6d12aaa58b612e98f7d36adb937"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/234199f4528de6d12aaa58b612e98f7d36adb937",
+                "reference": "234199f4528de6d12aaa58b612e98f7d36adb937",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0",
+                "sebastian/recursion-context": "^3.0"
+            },
+            "require-dev": {
+                "ext-mbstring": "*",
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.1.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Volker Dusch",
+                    "email": "github@wallbash.com"
+                },
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@2bepublished.at"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides the functionality to export PHP variables for visualization",
+            "homepage": "http://www.github.com/sebastianbergmann/exporter",
+            "keywords": [
+                "export",
+                "exporter"
+            ],
+            "time": "2017-04-03T13:19:02+00:00"
+        },
+        {
+            "name": "sebastian/global-state",
+            "version": "2.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/global-state.git",
+                "reference": "e8ba02eed7bbbb9e59e43dedd3dddeff4a56b0c4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/e8ba02eed7bbbb9e59e43dedd3dddeff4a56b0c4",
+                "reference": "e8ba02eed7bbbb9e59e43dedd3dddeff4a56b0c4",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "suggest": {
+                "ext-uopz": "*"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "http://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "time": "2017-04-27T15:39:26+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "3.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "7cfd9e65d11ffb5af41198476395774d4c8a84c5"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/7cfd9e65d11ffb5af41198476395774d4c8a84c5",
+                "reference": "7cfd9e65d11ffb5af41198476395774d4c8a84c5",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0",
+                "sebastian/object-reflector": "^1.1.1",
+                "sebastian/recursion-context": "^3.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "time": "2017-08-03T12:35:26+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "1.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "773f97c67f28de00d397be301821b06708fca0be"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/773f97c67f28de00d397be301821b06708fca0be",
+                "reference": "773f97c67f28de00d397be301821b06708fca0be",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "time": "2017-03-29T09:07:27+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+            "time": "2017-03-03T06:23:57+00:00"
+        },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
+                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides a list of PHP built-in functions that operate on resources",
+            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "time": "2015-07-28T20:34:47+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "time": "2016-10-03T07:35:21+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "time": "2017-04-07T12:08:54+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "0df1908962e7a3071564e857d86874dad1ef204a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/0df1908962e7a3071564e857d86874dad1ef204a",
+                "reference": "0df1908962e7a3071564e857d86874dad1ef204a",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6",
+                "sebastian/version": "^1.0.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.3-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "time": "2018-01-29T19:49:41+00:00"
         }
     ],
     "aliases": [],
diff --git a/src/Cli/Command/ProcessFileCommand.php b/src/Cli/Command/ProcessFileCommand.php
new file mode 100644
index 0000000..8404af7
--- /dev/null
+++ b/src/Cli/Command/ProcessFileCommand.php
@@ -0,0 +1,77 @@
+<?php
+declare(strict_types=1);
+
+namespace ZdenekZahor\IntraWorldsFileProcessor\Cli\Command;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use ZdenekZahor\IntraWorldsFileProcessor\DataProcessor;
+use ZdenekZahor\IntraWorldsFileProcessor\FileReader;
+use ZdenekZahor\IntraWorldsFileProcessor\IDecorator;
+use ZdenekZahor\IntraWorldsFileProcessor\IFilter;
+
+class ProcessFileCommand extends Command
+{
+    private const NAME = 'process-file';
+
+    private const ARG_FILE = 'file';
+
+    /**
+     * @var FileReader
+     */
+    private $fileReader;
+
+    /**
+     * @var DataProcessor
+     */
+    private $dataProcessor;
+
+    public function __construct()
+    {
+        parent::__construct();
+
+        $this->fileReader = new FileReader();
+
+        $this->dataProcessor = new DataProcessor(
+            new class() implements IDecorator
+            {
+                public function decorateRow(string $row): string
+                {
+                    if (preg_match('/test\.(\w+)/', $row, $matches)) {
+                        return strtolower($matches[1]);
+                    }
+                    return '';
+                }
+            },
+            new class() implements IFilter
+            {
+                public function filterRow(string $row): bool
+                {
+                    return $row !== '' && $row !== 'debug';
+                }
+            }
+        );
+    }
+
+    protected function configure(): void
+    {
+        parent::configure();
+
+        $this->setName(self::NAME);
+        $this->addArgument(self::ARG_FILE, InputArgument::REQUIRED);
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): ?int
+    {
+        // TODO Validace vstupního souboru.
+        $result = $this->dataProcessor->process($this->fileReader->readFile(__DIR__ . '/../../../' . $input->getArgument(self::ARG_FILE)));
+
+        foreach ($result->getItems() as $resultItem) {
+            $output->writeln("{$resultItem->getName()}: {$resultItem->getCount()}");
+        }
+
+        return 0;
+    }
+}
diff --git a/src/DataProcessor.php b/src/DataProcessor.php
new file mode 100644
index 0000000..beadf85
--- /dev/null
+++ b/src/DataProcessor.php
@@ -0,0 +1,46 @@
+<?php
+declare(strict_types=1);
+
+namespace ZdenekZahor\IntraWorldsFileProcessor;
+
+class DataProcessor
+{
+
+    /**
+     * @var IDecorator
+     */
+    private $decorator;
+
+    /**
+     * @var IFilter
+     */
+    private $filter;
+
+    /**
+     * @param IDecorator $decorator
+     * @param IFilter $filter
+     */
+    public function __construct(IDecorator $decorator, IFilter $filter)
+    {
+        $this->decorator = $decorator;
+        $this->filter = $filter;
+    }
+
+    /**
+     * @param iterable $rows
+     * @return Result
+     */
+    public function process(iterable $rows): Result
+    {
+        $result = new Result();
+
+        foreach ($rows as $row) {
+            $decoratedRow = $this->decorator->decorateRow($row);
+            if ($this->filter->filterRow($decoratedRow)) {
+                $result->incrementCount($decoratedRow);
+            }
+        }
+
+        return $result;
+    }
+}
diff --git a/src/FileReader.php b/src/FileReader.php
new file mode 100644
index 0000000..f37e1d3
--- /dev/null
+++ b/src/FileReader.php
@@ -0,0 +1,28 @@
+<?php
+declare(strict_types=1);
+
+namespace ZdenekZahor\IntraWorldsFileProcessor;
+
+use Generator;
+
+class FileReader
+{
+
+    /**
+     * [see] http://php.net/manual/en/language.generators.overview.php#112985
+     *
+     * @param string $file
+     * @return Generator
+     */
+    public function readFile(string $file): Generator
+    {
+        $f = fopen($file, 'r');
+        try {
+            while ($line = fgets($f)) {
+                yield $line;
+            }
+        } finally {
+            fclose($f);
+        }
+    }
+}
diff --git a/src/IDecorator.php b/src/IDecorator.php
new file mode 100644
index 0000000..1886e7f
--- /dev/null
+++ b/src/IDecorator.php
@@ -0,0 +1,14 @@
+<?php
+declare(strict_types=1);
+
+namespace ZdenekZahor\IntraWorldsFileProcessor;
+
+interface IDecorator
+{
+
+    /**
+     * @param string $row
+     * @return string
+     */
+    public function decorateRow(string $row): string;
+}
diff --git a/src/IFilter.php b/src/IFilter.php
new file mode 100644
index 0000000..b577e53
--- /dev/null
+++ b/src/IFilter.php
@@ -0,0 +1,14 @@
+<?php
+declare(strict_types=1);
+
+namespace ZdenekZahor\IntraWorldsFileProcessor;
+
+interface IFilter
+{
+
+    /**
+     * @param string $row
+     * @return bool
+     */
+    public function filterRow(string $row): bool;
+}
diff --git a/src/Result.php b/src/Result.php
new file mode 100644
index 0000000..83dcdef
--- /dev/null
+++ b/src/Result.php
@@ -0,0 +1,38 @@
+<?php
+declare(strict_types=1);
+
+namespace ZdenekZahor\IntraWorldsFileProcessor;
+
+class Result
+{
+
+    /**
+     * @var ResultItem[]
+     */
+    private $items;
+
+    public function __construct()
+    {
+        $this->items = [];
+    }
+
+    /**
+     * @return ResultItem[]
+     */
+    public function getItems(): array
+    {
+        return array_values($this->items);
+    }
+
+    /**
+     * @param string $name
+     */
+    public function incrementCount(string $name): void
+    {
+        if (isset($this->items[$name])) {
+            $this->items[$name]->incrementCount();
+        } else {
+            $this->items[$name] = new ResultItem($name, 1);
+        }
+    }
+}
diff --git a/src/ResultItem.php b/src/ResultItem.php
new file mode 100644
index 0000000..eb2cb31
--- /dev/null
+++ b/src/ResultItem.php
@@ -0,0 +1,49 @@
+<?php
+declare(strict_types=1);
+
+namespace ZdenekZahor\IntraWorldsFileProcessor;
+
+class ResultItem
+{
+
+    /**
+     * @var string
+     */
+    private $name;
+
+    /**
+     * @var int
+     */
+    private $count;
+
+    /**
+     * @param string $name
+     * @param int $count
+     */
+    public function __construct(string $name, int $count)
+    {
+        $this->name = $name;
+        $this->count = $count;
+    }
+
+    /**
+     * @return string
+     */
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    /**
+     * @return int
+     */
+    public function getCount(): int
+    {
+        return $this->count;
+    }
+
+    public function incrementCount(): void
+    {
+        $this->count++;
+    }
+}
diff --git a/tests/DataProcessorTest.php b/tests/DataProcessorTest.php
new file mode 100644
index 0000000..8641b47
--- /dev/null
+++ b/tests/DataProcessorTest.php
@@ -0,0 +1,49 @@
+<?php
+declare(strict_types=1);
+
+namespace ZdenekZahor\IntraWorldsFileProcessor;
+
+use PHPUnit\Framework\TestCase;
+
+class DataProcessorTest extends TestCase
+{
+    public function testProcess(): void
+    {
+        $processor = new DataProcessor(
+            new class() implements IDecorator
+            {
+                public function decorateRow(string $row): string
+                {
+                    if (preg_match('/test\.(\w+)/', $row, $matches)) {
+                        return strtolower($matches[1]);
+                    }
+                    return '';
+                }
+            },
+            new class() implements IFilter
+            {
+                public function filterRow(string $row): bool
+                {
+                    return $row !== '' && $row !== 'debug';
+                }
+            }
+        );
+
+        $inputRows = explode(PHP_EOL, file_get_contents(__DIR__ . '/../example.log'));
+        $resultItems = $processor->process($inputRows)->getItems();
+
+        $this->assertCount(6, $resultItems);
+        $this->assertEquals('error', $resultItems[0]->getName());
+        $this->assertEquals(2, $resultItems[0]->getCount());
+        $this->assertEquals('warning', $resultItems[1]->getName());
+        $this->assertEquals(2, $resultItems[1]->getCount());
+        $this->assertEquals('info', $resultItems[2]->getName());
+        $this->assertEquals(1, $resultItems[2]->getCount());
+        $this->assertEquals('notice', $resultItems[3]->getName());
+        $this->assertEquals(2, $resultItems[3]->getCount());
+        $this->assertEquals('emergency', $resultItems[4]->getName());
+        $this->assertEquals(1, $resultItems[4]->getCount());
+        $this->assertEquals('alert', $resultItems[5]->getName());
+        $this->assertEquals(1, $resultItems[5]->getCount());
+    }
+}