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docs(logging): use tracing for logging

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Dezhi Wu 2021-09-03 17:07:38 +08:00
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docs/dev/README.md
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@ -129,7 +129,8 @@ npm run lint
Logging is done by both rust-analyzer and VS Code, so it might be tricky to figure out where logs go.
Inside rust-analyzer, we use the standard `log` crate for logging, and `env_logger` for logging frontend.
Inside rust-analyzer, we use the [`tracing`](https://docs.rs/tracing/) crate for logging,
and [`tracing-subscriber`](https://docs.rs/tracing-subscriber) for logging frontend.
By default, log goes to stderr, but the stderr itself is processed by VS Code.
`--log-file <PATH>` CLI argument allows logging to file.
Setting the `RA_LOG_FILE=<PATH>` environment variable will also log to file, it will also override `--log-file`.