Struct Env

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

Expand description

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.

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impl<'a> Env<'a>

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pub fn new() -> Env<'a>

Get a default set of environment variables.

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pub fn filter<E>(self, filter_env: E) -> Env<'a>
where E: Into<Cow<'a, str>>,

Specify an environment variable to read the filter from.

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pub fn filter_or<E, V>(self, filter_env: E, default: V) -> Env<'a>
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.

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pub fn default_filter_or<V>(self, default: V) -> Env<'a>
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.

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pub fn write_style<E>(self, write_style_env: E) -> Env<'a>
where E: Into<Cow<'a, str>>,

Specify an environment variable to read the style from.

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pub fn write_style_or<E, V>(self, write_style_env: E, default: V) -> Env<'a>
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.

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pub fn default_write_style_or<V>(self, default: V) -> Env<'a>
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§

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

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

Formats the value using the given formatter. Read more

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impl Default for Env<'_>

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fn default() -> Env<'_>

Returns the “default value” for a type. Read more

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impl<'a, T> From<T> for Env<'a>
where T: Into<Cow<'a, str>>,

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fn from(filter_env: T) -> Env<'a>

Converts to this type from the input type.

Auto Trait Implementations§

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impl<'a> UnwindSafe for Env<'a>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self> ⓘ

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self> ⓘ

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self> ⓘ
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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