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ARCHITECTURE.md

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Architecture

Logical Components

CLI

The CLI is the main interaction point with confer.

The idea is to normalise a lot of arguments, and do a maximum of IO that is not directly related to the business logic of dealing with symbolic links.

Symlink Effect

The Symlink effect is the abstraction layer that implements the business logic and enforces its invariants at all time. It declares the operations that are performed on symbolic links, and provides two interpreters for them:

  • The “IO” interpreter is the effectful interpreter that will modify your file system.
  • The “Pure” interpreter does not modify the file system. It is used when the user uses --dry-run and will only display what the program plans to do.

Lua Runtime

Lua Evaluator

Confer embeds the Lua runtime to evaluate the user configuration. All standard libraries of the Lua 5.4 interpreter are made available.

Lua APIs

Confer provides its own APIs to query the host machine's information and the current users's information, like the home directory.

The confer namespace is implemented in pure Lua. It is distributed with confer. The host and user namespaces are implemented in Haskell and made available to the Lua environment.