Use tracing for configurable logging

src/core/mod.rs

@@ -35,6 +35,9 @@ pub struct Args {
 	/// use one thread per logical CPU core.
 	#[arg(short, long)]
 	pub jobs: Option<usize>,
+	/// Enable verbose messages
+	#[arg(short, long)]
+	pub verbose: bool,
 	/// Minecraft save directory
 	pub input_dir: PathBuf,
 	/// MinedMap data directory
@@ -54,6 +57,15 @@ pub fn cli() -> Result<()> {
 	let args = Args::parse();
 	let config = Config::new(&args);
 
+	tracing_subscriber::fmt()
+		.with_max_level(if args.verbose {
+			tracing::Level::DEBUG
+		} else {
+			tracing::Level::INFO
+		})
+		.with_target(false)
+		.init();
+
 	setup_threads(config.num_threads)?;
 
 	let rt = tokio::runtime::Builder::new_current_thread()

src/core/region_processor.rs

@@ -5,6 +5,7 @@ use std::{ffi::OsStr, path::Path, time::SystemTime};
 use anyhow::{Context, Result};
 use indexmap::IndexSet;
 use rayon::prelude::*;
+use tracing::{debug, error};
 
 use super::common::*;
 use crate::{
@@ -148,11 +149,11 @@ impl<'a> RegionProcessor<'a> {
 
 		if Some(input_timestamp) <= output_timestamp && Some(input_timestamp) <= lightmap_timestamp
 		{
-			println!("Skipping unchanged region r.{}.{}.mca", coords.x, coords.z);
+			debug!("Skipping unchanged region r.{}.{}.mca", coords.x, coords.z);
 			return Ok(());
 		}
 
-		println!("Processing region r.{}.{}.mca", coords.x, coords.z);
+		debug!("Processing region r.{}.{}.mca", coords.x, coords.z);
 
 		crate::nbt::region::from_file(path)?.foreach_chunk(
 			|chunk_coords, data: world::de::Chunk| {
@@ -204,7 +205,7 @@ impl<'a> RegionProcessor<'a> {
 
 		regions.par_iter().for_each(|&coords| {
 			if let Err(err) = self.process_region(coords) {
-				eprintln!("Failed to process region {:?}: {:?}", coords, err);
+				error!("Failed to process region {:?}: {:?}", coords, err);
 			}
 		});
 

src/core/tile_mipmapper.rs

@@ -2,6 +2,7 @@
 
 use anyhow::{Context, Result};
 use rayon::prelude::*;
+use tracing::{debug, warn};
 
 use super::common::*;
 use crate::{io::fs, types::*};
@@ -83,7 +84,7 @@ impl<'a> TileMipmapper<'a> {
 				let timestamp = match fs::modified_timestamp(&source_path) {
 					Ok(timestamp) => timestamp,
 					Err(err) => {
-						eprintln!("{}", err);
+						warn!("{}", err);
 						return None;
 					}
 				};
@@ -96,7 +97,7 @@ impl<'a> TileMipmapper<'a> {
 		};
 
 		if Some(input_timestamp) <= output_timestamp {
-			println!(
+			debug!(
 				"Skipping unchanged mipmap tile {}",
 				output_path
 					.strip_prefix(&self.config.output_dir)
@@ -106,7 +107,7 @@ impl<'a> TileMipmapper<'a> {
 			return Ok(());
 		}
 
-		println!(
+		debug!(
 			"Rendering mipmap tile {}",
 			output_path
 				.strip_prefix(&self.config.output_dir)
@@ -121,7 +122,7 @@ impl<'a> TileMipmapper<'a> {
 			let source = match image::open(&source_path) {
 				Ok(source) => source,
 				Err(err) => {
-					eprintln!(
+					warn!(
 						"Failed to read source image {}: {}",
 						source_path.display(),
 						err,

src/core/tile_renderer.rs

@@ -12,6 +12,7 @@ use glam::Vec3;
 use lru::LruCache;
 use rayon::prelude::*;
 use tokio::sync::OnceCell;
+use tracing::debug;
 
 use super::{common::*, region_group::RegionGroup};
 use crate::{
@@ -272,7 +273,7 @@ impl<'a> TileRenderer<'a> {
 		let output_timestamp = fs::read_timestamp(&output_path, FILE_META_VERSION);
 
 		if Some(processed_timestamp) <= output_timestamp {
-			println!(
+			debug!(
 				"Skipping unchanged tile {}",
 				output_path
 					.strip_prefix(&self.config.output_dir)
@@ -282,7 +283,7 @@ impl<'a> TileRenderer<'a> {
 			return Ok(());
 		}
 
-		println!(
+		debug!(
 			"Rendering tile {}",
 			output_path
 				.strip_prefix(&self.config.output_dir)