Tags: Improve handling of Year tag

CHANGELOG.md

@@ -30,6 +30,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - All of the format-specific features have been removed, as they served no purpose. They used to bring in
     optional dependencies, but they have long since been removed.
 
+### Fixed
+- **Tag**: Handling of the `Year` tag has been improved.
+  - Previously, setting a year with `Tag::set_year` required a `RecordingDate`. Now it will check if the format
+  	supports the `Year` tag, and if not, then it will set a `RecordingDate`.
+
 ## [0.10.0] - 2022-12-27
 
 ### Added

src/id3/v1/tag.rs

@@ -258,13 +258,18 @@ impl From<ID3v1Tag> for Tag {
 }
 
 impl From<Tag> for ID3v1Tag {
-	fn from(input: Tag) -> Self {
+	fn from(mut input: Tag) -> Self {
+		let title = input.take_strings(&ItemKey::TrackTitle).next();
+		let artist = input.take_strings(&ItemKey::TrackArtist).next();
+		let album = input.take_strings(&ItemKey::AlbumTitle).next();
+		let year = input.year().map(|y| y.to_string());
+		let comment = input.take_strings(&ItemKey::Comment).next();
 		Self {
-			title: input.get_string(&ItemKey::TrackTitle).map(str::to_owned),
-			artist: input.get_string(&ItemKey::TrackArtist).map(str::to_owned),
-			album: input.get_string(&ItemKey::AlbumTitle).map(str::to_owned),
-			year: input.get_string(&ItemKey::Year).map(str::to_owned),
-			comment: input.get_string(&ItemKey::Comment).map(str::to_owned),
+			title,
+			artist,
+			album,
+			year,
+			comment,
 			track_number: input
 				.get_string(&ItemKey::TrackNumber)
 				.map(|g| g.parse::<u8>().ok())

src/tag/mod.rs

@@ -204,8 +204,17 @@ impl Accessor for Tag {
 			if item.len() >= 4 {
 				let (_, remaining) = item.split_at(4);
 				self.insert_text(ItemKey::RecordingDate, format!("{value}{remaining}"));
+				return;
 			}
 		}
+
+		// Some formats have a dedicated item for `Year`, others just have it as
+		// a part of `RecordingDate`
+		if ItemKey::Year.map_key(self.tag_type, false).is_some() {
+			self.insert_text(ItemKey::Year, value.to_string());
+		} else {
+			self.insert_text(ItemKey::RecordingDate, value.to_string());
+		}
 	}
 
 	fn remove_year(&mut self) {