Deprecate bus_name_player_name_part

Author: Kanjirito

CHANGELOG.md

@@ -7,6 +7,17 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Added
+
+- `Player::bus_name_trimmed()` which returns the player's bus name without the
+  MPRIS2 prefix - [Kanjirito][Kanjirito]
+
+### Deprecated
+
+- `Player::bus_name_player_name_part()` is now deprecated and will be removed
+  in the next major release. See the method's documentation and [#81][#81] for
+  details and workarounds.
+
 ### Removed
 
 - Removed `derive_is_enum_variant` dependency. - [poly000][poly000]
@@ -230,3 +241,4 @@ MetadataValue>, DBusError>`.
 [fengalin]: https://github.com/fengalin
 [fufexan]: https://github.com/fufexan
 [poly000]: https://github.com/poly000
+[#81]: https://github.com/Mange/mpris-rs/issues/81

src/player.rs

@@ -111,7 +111,32 @@ impl Player {
     ///
     /// See: [MPRIS2 specification about bus names][bus_names].
     ///
+    /// **Deprecation information:** The MPRIS2 specification doesn't specify how the unique instance
+    /// identifier part of the bus name should look, therefore every player can ignore the example
+    /// and implement it in its own way. This method was trying to guess the instance part and was
+    /// not always successful. See [this issue][issue] for the relevant discussion.
+    /// In the case when [`identity`][Self::identity] is not able to differentiate the players so
+    /// you need to filter out players by their bus names you should filter the results of [`PlayerFinder`][crate::find::PlayerFinder].
+    /// For example:
+    /// ```no_run
+    /// use mpris::PlayerFinder;
+    /// let finder = PlayerFinder::new().unwrap();
+    /// for player in finder
+    ///     .iter_players()
+    ///     .unwrap()
+    ///     .map(|p| p.unwrap())
+    ///     .filter(|p| p.bus_name_trimmed().starts_with("mpv"))
+    /// {
+    ///     // Do something with only mpv instances
+    /// }
+    ///```
+    ///
     /// [bus_names]: https://specifications.freedesktop.org/mpris-spec/latest/#Bus-Name-Policy
+    /// [issue]: https://github.com/Mange/mpris-rs/issues/81
+    #[deprecated(
+        since = "2.1.0",
+        note = "See documentation for explanation, use `bus_name_trimmed` instead"
+    )]
     pub fn bus_name_player_name_part(&self) -> &str {
         self.bus_name()
             .trim_start_matches(MPRIS2_PREFIX)
@@ -120,6 +145,16 @@ impl Player {
             .unwrap()
     }
 
+    /// Returns the player name part of the player's D-Bus bus name with the MPRIS2 prefix trimmed.
+    ///
+    /// Examples:
+    /// - `org.mpris.MediaPlayer2.io.github.celluloid_player.Celluloid` -> `io.github.celluloid_player.Celluloid`
+    /// - `org.mpris.MediaPlayer2.Spotify.` -> `Spotify`
+    /// - `org.mpris.MediaPlayer2.mpv.instance123` -> `mpv.instance123`
+    pub fn bus_name_trimmed(&self) -> &str {
+        self.bus_name().trim_start_matches(MPRIS2_PREFIX)
+    }
+
     /// Returns the player's unique D-Bus bus name (usually something like `:1.1337`).
     pub fn unique_name(&self) -> &str {
         &self.unique_name