Struct Env

pub struct Env<'a> { /* private fields */ }

Set of environment variables to configure from.

Default environment variables

By default, the Env will read the following environment variables:

• RUST_LOG: the level filter
• RUST_LOG_STYLE: whether or not to print styles with records.

These sources can be configured using the builder methods on Env.

Implementations

impl<'a> Env<'a>

pub fn new() -> Self

Get a default set of environment variables.

pub fn filter<E>(self, filter_env: E) -> Self

where E: Into<Cow<'a, str>>,

Specify an environment variable to read the filter from.

pub fn filter_or<E, V>(self, filter_env: E, default: V) -> Self

where E: Into<Cow<'a, str>>, V: Into<Cow<'a, str>>,

Specify an environment variable to read the filter from.

If the variable is not set, the default value will be used.

pub fn default_filter_or<V>(self, default: V) -> Self

where V: Into<Cow<'a, str>>,

Use the default environment variable to read the filter from.

If the variable is not set, the default value will be used.

pub fn write_style<E>(self, write_style_env: E) -> Self

where E: Into<Cow<'a, str>>,

Specify an environment variable to read the style from.

pub fn write_style_or<E, V>(self, write_style_env: E, default: V) -> Self

where E: Into<Cow<'a, str>>, V: Into<Cow<'a, str>>,

Specify an environment variable to read the style from.

If the variable is not set, the default value will be used.

pub fn default_write_style_or<V>(self, default: V) -> Self

where V: Into<Cow<'a, str>>,

Use the default environment variable to read the style from.

If the variable is not set, the default value will be used.

Trait Implementations

impl<'a> Debug for Env<'a>

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

Formats the value using the given formatter.

impl<'a> Default for Env<'a>

fn default() -> Self

Returns the “default value” for a type.

impl<'a, T> From<T> for Env<'a>

where T: Into<Cow<'a, str>>,

fn from(filter_env: T) -> Self

Converts to this type from the input type.