Struct ConfigStack 

pub struct ConfigStack { /* private fields */ }

A minimal, explicit config layering plan.

Precedence (low → high): Defaults → FilePath → EnvPrefix.

Implementations

impl ConfigStack

pub fn new() -> Self

Create an empty stack (no sources enabled).

pub fn with_defaults(self) -> Self

Enable defaults as the lowest-precedence source.

pub fn with_file_path(self, path: impl Into<String>) -> Self

Add a file path source.

pub fn with_env_prefix(self, prefix: impl Into<String>) -> Self

Add an environment variable prefix source.

pub fn sources(&self) -> Vec<ConfigSource>

Return sources in application order (low → high precedence).

pub fn load_kv_map(&self, defaults: ConfigMap) -> Result<ConfigMap>

Load a merged key/value configuration map.

Precedence (low → high): Defaults → FilePath → EnvPrefix.

Notes:

• Defaults are provided by the caller (so applications own their schema).
• File format is simple KEY=VALUE lines; comments start with #.

Errors

Returns an error when reading or parsing the configured file fails, or when environment loading fails.

Trait Implementations

impl Clone for ConfigStack

fn clone(&self) -> ConfigStack

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ConfigStack

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ConfigStack

fn default() -> ConfigStack

Returns the “default value” for a type.