Process files in parallel

src/main.rs

@@ -1,6 +1,6 @@
 use clap::{Parser, ValueHint};
 use image::DynamicImage;
-use log::info;
+use log::*;
 use pdf_writer::{Content, Filter, Finish, Name, Pdf, Rect, Ref};
 use rayon::prelude::*;
 use std::ffi::OsStr;
@@ -166,14 +166,19 @@ fn convert_directory(
     directory: &Path,
     output_dir: &Path,
 ) -> Result<(), Box<dyn std::error::Error>> {
-    info!("Walking {:?}", directory);
+    debug!("Walking {:?}", directory);
+    let mut entries = Vec::new();
     for entry in WalkDir::new(directory) {
         let entry = entry?;
         let path = entry.path();
         if path.is_file() && path.extension() == Some(OsStr::new("cbz")) {
-            convert_cbz(path, output_dir)?;
+            entries.push(entry);
         }
     }
 
+    entries
+        .par_iter()
+        .for_each(|entry| convert_cbz(entry.path(), output_dir).unwrap());
+
     Ok(())
 }