Module var_expand 

Single-pass expansion of ${VAR} and ${VAR:-default} placeholders from environment variables.

Enums

ExpandVarsError

Error returned by expand_env_vars.

Traits

ExpandVars

Trait for types whose String fields can be expanded from environment variables.

Functions

expand_env_vars

Expand ${VAR_NAME} and ${VAR_NAME:-default} placeholders in input with values from the environment.