In the context of deciding how the application might be used, I decided to create a command line interface To achieve the most elegant, fast, and maintainable solution Accepting that their might be a case for users who might have a preference for a more ubiquitous solution such as one that runs in the browser.
In the context of the system used for building and packaging Haskell libraries, I used Cabal to achieve a simple and extensible solution Accepting that Stack could also have been an alternative.
In the context of the storage of usage data, I decided to use a plain text file, to achieve a solution that a client might easily open in any standard spreadsheet application, Accepting that other standard solutions, such as JSON, might be more applicable in certain application environments.
In the context of parsing data to a Haskell type representation, I decided to use TagSoup To achieve reliable and generically standard code, smooth integration with an http client and a flexible API. as both http and parsing are available. Accepting that other solutions might achieve similar results.
In the context of finding a good testing approach, I decided to use HUnit, To achieve standard unit tests, that work from Cabal, Accepting that the addition of QuickTest might be useful for some scenarios.