refactor: minor refactoring

src/main.rs

@@ -65,17 +65,8 @@ fn rename_files(directory: &str, base: &str, args: &Arguments) -> Result<i32> {
             if let Some(sub_dir) = path.to_str() {
                 count += rename_files(sub_dir, base, args).context("Failed to rename files")?;
             }
-        }
-        if !path.is_file() {
-            continue;
-        }
-        let Ok(file) = taglib::File::new(&path) else {
-            continue;
-        };
-        let Ok(tag) = file.tag() else {
-            continue;
-        };
-        let (Some(title), Some(artist)) = (tag.title(), tag.artist()) else {
+        } else if path.is_file() {
+            let Some((title, artist)) = find_tag_info(&path) else {
                 continue;
             };
             let (bucket, _) = artist.split_at(1);
@@ -92,20 +83,41 @@ fn rename_files(directory: &str, base: &str, args: &Arguments) -> Result<i32> {
             println!("- title : {title}");
             println!("> {new_name}");
             if args.not_dry_run() {
+                rename_file(base, new_name, path)?;
+            }
+        }
+    }
+    Ok(count)
+}
+
+fn find_tag_info(path: &std::path::PathBuf) -> Option<(String, String)> {
+    let Ok(file) = taglib::File::new(path) else {
+        return None;
+    };
+    let Ok(tag) = file.tag() else {
+        return None;
+    };
+    let (Some(title), Some(artist)) = (tag.title(), tag.artist()) else {
+        return None;
+    };
+    Some((title, artist))
+}
+
+fn rename_file(
+    base: &str,
+    new_name: String,
+    path: std::path::PathBuf,
+) -> Result<(), anyhow::Error> {
     let target_path = Path::new(&base).join(new_name);
     if !target_path.exists() {
         let dir = target_path
             .parent()
             .with_context(|| format!("Failed to get parent: {:#?}", target_path))?;
-                create_dir_all(dir)
-                    .with_context(|| format!("Failed to create directory: {:#?}", dir))?;
+        create_dir_all(dir).with_context(|| format!("Failed to create directory: {:#?}", dir))?;
     }
-
     rename(&path, &target_path)
         .with_context(|| format!("Failed to rename file: {:#?}", target_path))?;
-        }
-    }
-    Ok(count)
+    Ok(())
 }
 
 fn build_series_name(bucket: &str, artist: &str, album: &str, title: &str) -> String {