The purpose of the binary is providing a command line interface for managing git-dit issues, associated messages and metadata. Naturally, this is done via types representing different aspects which are grouped in modules.

• display provides formatting utilities for various items.
• filters provides issue filtering facilities.
• gitext provides some extensions to the git2 library which are relevant (only) for this application.
• system provides I/O utilities as well as utilities for spawning specific programs based on configuration and the logger.
• util provides application specific utilities, e.g. retrieving specific command line arguments or configuration variables.
• error provides error types.

We impose a number of restrictions on inter-module dependencies.

• error shall not depend on any other module of the library.

• The system module shall not depend on libgitdit.

• Generally, sub-modules shall not depend on siblings of its super-module. For example, formatter::msgtree shall not depend on util. However, any module or submodule may depend on error.

• Functions of the root module as well as functions in util and filter may abort rather than return a Result. For the root and util modules, in fact, aborting should be preferred to returning a Result.

• All other modules shall not abort or panic. The system::abort module is the only exception since it provides the aborting functionality.