Implement missing features, some cleanup

src/log.rs

@@ -0,0 +1,55 @@
+use static_init::dynamic;
+use std::error::Error;
+use std::fmt;
+use std::str::FromStr;
+use std::sync::{Arc, RwLock};
+use std::time::SystemTime;
+
+use log::{Level, LevelFilter, Metadata, Record, SetLoggerError};
+use time::format_description::FormatItem;
+use time::formatting::Formattable;
+use time::macros::format_description;
+use time::OffsetDateTime;
+
+const LOG_DATETIME_FORMAT: &[FormatItem] = format_description!(
+    "[year]-[month]-[day] [hour]:[minute]:[second] [offset_hour \
+         sign:mandatory]:[offset_minute]:[offset_second]"
+);
+
+#[derive(Clone, Copy)]
+pub struct SimpleLogger {
+    pub level: log::Level,
+}
+
+fn time_format<T>(dt: T, format: &(impl Formattable + ?Sized)) -> String
+where
+    T: Into<OffsetDateTime>,
+{
+    dt.into().format(format).unwrap()
+}
+
+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()) {
+            println!(
+                "{} {:5} {}:{}: {}",
+                time_format(SystemTime::now(), &LOG_DATETIME_FORMAT),
+                record.level(),
+                record.file().unwrap(),
+                record.line().unwrap(),
+                record.args()
+            );
+        }
+    }
+
+    fn flush(&self) {}
+}
+
+pub fn init(level: Level) -> Result<(), SetLoggerError> {
+    log::set_boxed_logger(Box::new(SimpleLogger { level }))
+        .map(|()| log::set_max_level(LevelFilter::Trace))
+}