Crate gen_config 

gen-config — typed operator-facing configuration for the gen engine. Implements shikumi::TieredConfig; every consumer resolves via GenConfig::resolve_from_env("GEN_TIER") at startup.

The four typed slot groups (workspace / cache / render / target) cover every knob an operator can flip without recompiling. New knobs land here, not in CLI flags — flags are a view, config is the substrate.

Structs

CacheConfig

Substituter / cache settings. Engine consults this before deciding to evaluate a derivation; substituter hits short-circuit the rebuild.

GenConfig

Top-level config. Composes the four typed sub-slots.

RenderConfig

Render-shape settings. Controls whether the engine emits per-crate derivations (crate2nix shape, default for incremental local dev) or per-tree derivations (crane shape, default for CI bulk builds).

TargetConfig

Concrete target the engine evaluates predicates against.

WorkspaceConfig

Workspace discovery + adapter routing.

Enums

RenderMode

Functions

target_from_config

Convenience: build a gen_types::Target from the config’s TargetConfig. Engines call this to seed predicate evaluation.