Module config 

Configuration, split by ownership (ADR 0012, amended by ADR 0018-era split):

• Repo-level .differential.toml at the target repo’s root — classification hints only. Shared by everyone reviewing the repo.
• User-level ~/.config/differential/config.toml (XDG) — [grouping]: which agent CLI to run and its timeout, and [review]: which palette the reviewer wears, how much context it shows around a hunk, and which diff layout it opens in. All per-user choices, not properties of the repo, so none of them lives in it.

HARD RULE (ADR 0012): config tunes classification hints and tool behaviour. It can never remove a file or hunk from enumeration — enumeration runs before and independently of anything in this module, and nothing here is consulted by the parser or the invariants.

Structs

Config

GroupingConfig

[grouping] — pure data; the application layer turns it into an LLM backend (ADR 0018, 0020).

ReviewConfig

[review] — how the terminal reviewer looks, and how much of a file it shows around a hunk.

UserConfig

Everything parse_user reads, so load assigns one value rather than growing a second assignment every time the user file gains a table.

Enums

Agent

Which agent to run, by name.

DiffLayout

How the reviewer lays a hunk out.

ReadOnly

What keeps an agent from writing.

ThemeName

Which palette the terminal reviewer wears, by name.

Constants

CONFIG_FILE_NAME

DEFAULT_ATTRIBUTES

gitattributes names honoured as a “generated” declaration when [classify].attributes is absent.

USER_CONFIG_DIR

USER_CONFIG_FILE_NAME

Functions

user_config_path

<user config dir>/differential/config.toml.