Description
Feature Request
Crates
tracing
Motivation
tracing is very useful in various long-running daemons (and seems to be designed for them). Such daemons often need configuration, including the log level. When debugging one usually runs the daemon manually from command line an possibly wants to pass a --log-level argument to raise the level. There's a crate called parse_arg that provides a trivial trait for types so that they can be easily hooked into argument parsers. E.g. configure_me, which is configuration parser designed for long-running daemons uses this trait. Thus it'd make sense to provide the impls in tracing directly, so that people implementing such daemons can just activate the feature.
Proposal
Add an optional dependency on parse_arg that, when enabled, implements the ParseArg trait on all types that could be parsed from command line - typically those implementing FromStr such as Level and LevelFilter. I'll happily make a PR. The crate is stable and has conservative MSRV.
Alternatives
- Do nothing and let everyone do the newtype thing - this means repeated boilerplate
- Make a separate crate containing newtypes to be used with
parse_arg- this isn't entirely terrible but creating a crate to contain two types with two trait impls seems too much. Also inserting an additional conversion is a bit annoying.