Module env 

Ambient state: where files live, and what day it is.

Env::capture is the only place the library reads process environment variables or the current directory, and Clock is the only source of the current date. Both are passed down explicitly so the rest of the crate is deterministic under test.

Structs

Env

Where the tool reads and writes, and where it was invoked from.

FixedClock

A clock frozen at a fixed date, for tests and reproducible runs.

SystemClock

A clock backed by the system’s local time.

Enums

EnvError

Errors produced while inspecting the environment.

Constants

CONFIG_DIR_VAR

Environment variable holding an explicit configuration directory.

CONFIG_FILE_NAME

The name of the configuration file inside the configuration directory.

SESSION_VAR

Environment variable holding the Advent of Code session cookie.

Traits

Clock

The source of the current date.

Functions

is_december

Whether a date falls inside an Advent of Code event.