An IO-free library that parses the output of Mercurial commands

[volgo] is a set of OCaml libraries for interacting with Git repositories. It provides a type-safe and direct-style API to programmatically perform Git operations, ranging from creating commits and branches to loading and navigating commit graphs in memory, computing diffs between revisions, and more.

[Volgo_hg_backend] is not meant to be used directly by a user. Rather it is a helper library for building Mercurial CLI backends for [volgo]. Given the ability to run a [hg] process, this library knows which commands to run, how to parse their output, and how to interpret their exit codes to turn them into typed results.