| //! Shared logging — writes to `OpenWA.log` in the working directory, | |
| //! or to the path specified by `OPENWA_LOG_PATH` env var. | |
| use std::path::PathBuf; | |
| use std::sync::OnceLock; | |
| /// Resolve the log file path once. Uses `OPENWA_LOG_PATH` env var if set, | |
| /// otherwise defaults to `"OpenWA.log"`. | |
| fn log_path() -> &'static PathBuf { | |
| static PATH: OnceLock<PathBuf> = OnceLock::new(); | |
| PATH.get_or_init(|| { | |
| std::env::var_os("OPENWA_LOG_PATH") | |
| .map(PathBuf::from) | |
| .unwrap_or_else(|| PathBuf::from("OpenWA.log")) | |
| }) | |
| } | |
| /// Append a line to the OpenWA log file. | |
| pub fn log_line(msg: &str) -> std::io::Result<()> { | |
| use std::io::Write; | |
| let mut f = std::fs::OpenOptions::new() | |
| .create(true) | |
| .append(true) | |
| .open(log_path())?; | |
| writeln!(f, "{msg}")?; | |
| Ok(()) | |
| } | |