Recruitment task

The aim is to create a command line tool which reads data from a file, performs simple operation on this data and stores or prints a result. Input files could have different format (csv, yml, xml), but they contain the same data. The result could be stored in a plain text file or printed on stdout. Please see the input files (located in data directory) to check the data structure.

Requirements

• Fork this repository.
• Bootstrap a project with composer.
• Use PSR-4 for autoloading.
• Build a tool.
• Add some tests (unit/integration/functional in TDD/BDD style - it's up to you).
• Add very basic documentation in README.md (how to run the tool). You can replace this readme file.
• Push your code into your github account. Make it available for review.

Logic

We should be able to run the tool from a command line and pass an input parameter and optional output parameter.

• Input parameter is a path to a file that should be processed.
• Output parameter is optional and it is a path to the output file.
• If the output parameter is not provided the result should be printed to stdout.

The tool should parse the input file and output the result. The result is a simple sum of value property for every active entity.

We should be able to run the tool somehow like:

$ php script.php data/file.yml

# outputs 900

or

$ php script.php --input="data/file.xml" --output="results/result.txt"

# creates results/result.txt and puts a number 900 as a content

Assumptions

• File extension describes file type (*.csv, *.yml, *.xml).
• User always has to pass 1 or 2 parameters - input and optionally output.

Recommendations

• Try to avoid using full stack frameworks (like Symfony or Laravel). Standalone libraries or components are obviously acceptable.
• Try to follow OOP approach. Don't be afraid of "over-engineering" that tool. This task obviously is simple and could be done in a few lines of code but we're interested in your OOP knowledge.