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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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@ -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. 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. By default, log goes to stderr, but the stderr itself is processed by VS Code.
`--log-file <PATH>` CLI argument allows logging to file. `--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`. Setting the `RA_LOG_FILE=<PATH>` environment variable will also log to file, it will also override `--log-file`.