feat: use custom logger with timestamp in rfc3339 (#67)

src/logger.rs

@@ -0,0 +1,30 @@
+use chrono::{Local, SecondsFormat};
+use log::{Level, Metadata, Record};
+use log::{LevelFilter, SetLoggerError};
+
+struct SimpleLogger;
+
+impl log::Log for SimpleLogger {
+    fn enabled(&self, metadata: &Metadata) -> bool {
+        metadata.level() <= Level::Info
+    }
+
+    fn log(&self, record: &Record) {
+        if self.enabled(record.metadata()) {
+            let timestamp = Local::now().to_rfc3339_opts(SecondsFormat::Secs, true);
+            if record.level() < Level::Info {
+                eprintln!("{} {} - {}", timestamp, record.level(), record.args());
+            } else {
+                println!("{} {} - {}", timestamp, record.level(), record.args());
+            }
+        }
+    }
+
+    fn flush(&self) {}
+}
+
+static LOGGER: SimpleLogger = SimpleLogger;
+
+pub fn init() -> Result<(), SetLoggerError> {
+    log::set_logger(&LOGGER).map(|()| log::set_max_level(LevelFilter::Info))
+}