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subscriber: propagate ANSI config via Writer (#1696 )

This backports PR #1696 to v0.1.x.

## Motivation

Currently, whether `tracing-subscriber`'s `fmt` subscriber will ANSI
formatting escape codes use is configured on the `Format` type. This
means that the configuration is honored by the event formatters
implemented in `tracing-subscriber`, but is not easily exposed to those
in other crates. Additionally, it's not currently easy to expose the
configuration to the field formatter, so it's difficult to implement
field formatters that use ANSI escape codes conditionally.

Issue #1651 suggested a new API for this, where the writer that's passed
in to the event and field formatters provides a method for checking if
ANSI escape codes are supported.

## Solution

This branch adds a new method to the `Writer` type added in #1661. The
`FormatEvent` and `FormatFields` implementations can call
`Writer::has_ansi_escapes` to determine whether ANSI escape codes are
supported. This is also propagated to `FormattedFields`, so that it can
be determined when adding new fields to a preexisting set of formatted
fields.

Fixes #1651

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

2021-11-08 10:43:29 -08:00

benches

subscriber: update sharded-slab, pool hashmaps (#1064 )

2020-10-22 16:23:02 -07:00

src

subscriber: propagate ANSI config via Writer (#1696 )

2021-11-08 10:43:29 -08:00

tests

subscriber: rename Layer::new_span to on_new_span (#1674 )

2021-10-22 13:26:09 -07:00

Cargo.toml

subscriber: prepare to release v0.3.1 (#1687 )

2021-10-25 10:03:59 -07:00

CHANGELOG.md

changelog: Clarify implications of env-filter not being the default (#1700 )

2021-11-03 10:52:54 -07:00

LICENSE

chore: Include the LICENSE in every crate (#842 )

2020-07-23 12:23:04 -07:00

README.md

subscriber: prepare to release v0.3.1 (#1687 )

2021-10-25 10:03:59 -07:00

README.md

tracing-subscriber

Utilities for implementing and composing tracing subscribers.

Documentation | Chat

Compiler support: requires rustc 1.42+

Supported Rust Versions

Tracing is built against the latest stable release. The minimum supported version is 1.42. The current Tracing version is not guaranteed to build on Rust versions earlier than the minimum supported version.

Tracing follows the same compiler support policies as the rest of the Tokio project. The current stable Rust compiler and the three most recent minor versions before it will always be supported. For example, if the current stable compiler version is 1.45, the minimum supported version will not be increased past 1.42, three minor versions prior. Increasing the minimum supported compiler version is not considered a semver breaking change as long as doing so complies with this policy.

License

This project is licensed under the MIT license.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tracing by you, shall be licensed as MIT, without any additional terms or conditions.