Struct ModuleFilters 

pub struct ModuleFilters { /* private fields */ }

Module-level log filters.

This struct manages log level filters on a per-module basis, allowing fine-grained control over which modules should log at which levels.

Filters are checked from most specific to least specific:

1. Exact module path match (e.g., my_crate::module::submodule)
2. Prefix match (e.g., my_crate::module matches my_crate::module::*)
3. Global default level

Implementations

impl ModuleFilters

pub fn new(default_level: LevelFilter) -> Self

Create a new ModuleFilters with a default level.

pub fn from_env() -> Self

Parse RUST_LOG environment variable format.

Supports formats like:

• debug - Set default level to debug
• my_crate=debug - Set specific module to debug
• my_crate::module=trace,warn - Multiple filters separated by comma
• my_crate=debug,other_crate::module=trace - Multiple module filters

pub fn parse(s: &str) -> Self

Parse a RUST_LOG-style filter string.

pub fn add_filter(&mut self, module: impl Into<String>, level: LevelFilter)

Add a filter for a specific module.

pub fn level_for(&self, module_path: &str) -> LevelFilter

Get the log level for a specific module path.

This checks in order:

1. Exact match for the module path
2. Prefix matches (from most specific to least specific)
3. Default level

pub fn default_level(&self) -> LevelFilter

Get the default level.

pub fn set_default_level(&mut self, level: LevelFilter)

Set the default level.

Trait Implementations

impl Clone for ModuleFilters

fn clone(&self) -> ModuleFilters

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ModuleFilters

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

Formats the value using the given formatter.

impl Default for ModuleFilters

fn default() -> Self

Returns the “default value” for a type.