config Eloquent configuration for Golang apps.

Features:

• Substitutes $VARIABLE and ${VARIABLE} with variables found in a shell environment.
• Syntaxes for setting up default values and specifying mandatory variables:
  • ${VARIABLE:-default} evaluates to default if VARIABLE is unset or empty in the environment.
  • ${VARIABLE-default} evaluates to default only if VARIABLE is unset in the environment.
  • ${VARIABLE:?err} panics with an error message containing err if VARIABLE is unset or empty in the environment.
  • ${VARIABLE?err} panics with an error message containing err if VARIABLE is unset in the environment.

Examples:

• Config with a default port value for an HTTP server