Module data_dir 

Structs

TestEnvGuard

RAII guard for test_env_lock. Dropping the outermost one releases the underlying mutex; nested guards just decrement the depth.

Functions

all_data_dirs_with_stats

Returns all known data directories that contain stats data, in resolution priority order (legacy → mixed config → XDG data). Used by the dual-dir consolidation (crate::core::data_consolidate) and doctor diagnostics.

lean_ctx_data_dir

Resolve the lean-ctx data directory.

test_env_lock

Reentrant test env lock. Serializes env-mutating tests across threads (the point — std::env::set_var is not thread-safe) while letting the SAME thread re-acquire without deadlocking. A test and a setup() helper (or isolated_data_dir) can both take it; only the outermost acquisition holds the underlying mutex, nested ones just bump a per-thread depth. Other threads still block, so cross-test serialization is unchanged.