Split code into serveral modules

src/logger.rs

@@ -0,0 +1,33 @@
+use anyhow::Result;
+use fern::colors::{Color, ColoredLevelConfig};
+use log::{debug, error, info, warn};
+use std::io;
+
+pub fn setup_logger() -> Result<()> {
+    let colors = ColoredLevelConfig::new()
+        .info(Color::Green)
+        .error(Color::Red)
+        .warn(Color::Yellow)
+        .debug(Color::Blue);
+
+    fern::Dispatch::new()
+        // Perform allocation-free log formatting
+        .format(move |out, message, record| {
+            out.finish(format_args!(
+                "[{} {} {}] {}",
+                humantime::format_rfc3339_millis(std::time::SystemTime::now()),
+                colors.color(record.level()),
+                record.target(),
+                message
+            ))
+        })
+        // Add blanket level filter -
+        .level(log::LevelFilter::Debug)
+        // - and per-module overrides
+        .chain(std::io::stdout())
+        .chain(fern::log_file("output.log")?)
+        // Apply globally
+        .apply()?;
+
+    Ok(())
+}