Package conf package provides tools for easily loading program configurations from multiple sources such as the command line arguments, environment, or a configuration file. Most applications only need to use the Load function to get their settings loaded into an object. By default, Load will read from a configurable file defined by the -config-file command line argument, load values present in the environment, and finally load the program arguments. The object in which the configuration is loaded must be a struct, the names and types of its fields are introspected by the Load function to understand how to load the configuration. The name deduction from the struct field obeys the same rules than those implemented by the standard encoding/json package, which means the program can set the "conf" tag to override the default field names in the command line arguments and configuration file. A "help" tag may also be set on the fields of the configuration object to add documentation to the setting, which will be shown when the program is asked to print its help. When values are loaded from the environment the Load function looks for variables matching the struct fields names in snake-upper-case form.