Struct ConfigLayer 

pub struct ConfigLayer { /* private fields */ }

One config file’s settings as written: the keys it sets and nothing else.

Keeping a layer partial is what lets a later file set a value back to its default: notes_accent = true in your config undoes an import’s false, and a file that leaves the key out changes nothing. AppConfig::from_layers fills in the defaults once, after every layer is merged.

Implementations

impl ConfigLayer

pub fn parse(text: &str) -> Result<Self>

A layer from TOML text. Types are checked here, so a mistake is reported against the file that holds it rather than after merging.

pub fn from_overrides(overrides: &[Override]) -> Result<Self>

The layer -c KEY=VALUE makes: each key at its place, the last of one key winning. Keys and value shapes were checked as the command line was read; the types are checked here, as a file’s are.

pub fn get(&self, key: &str) -> Option<&Value>

The value this layer writes at the dotted key, if it writes one.

pub fn merge(&mut self, upper: ConfigLayer)

Lay upper over this layer: every key upper writes wins, except the combined keys in [COMBINED_KEYS], and keys it leaves out keep this layer’s value. upper’s imports are not carried over.

Trait Implementations

impl Clone for ConfigLayer

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ConfigLayer

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

Formats the value using the given formatter.

impl Default for ConfigLayer

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for ConfigLayer

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ConfigLayer