Fix newly reported clippy errors

- Use variables directly in format strings.
  As reported by clippy, variables can be used directly in the
  `format!` string.
- Use rewind() instead of seeking to 0.
- Remove superfluous & and ref.

Signed-off-by: Petr Tesarik <petr@tesarici.cz>

audio/src/fetch/receive.rs

@@ -62,7 +62,7 @@ async fn receive_data(
                 Some(Err(e)) => break Err(e.into()),
                 None => {
                     if actual_length != request.length {
-                        let msg = format!("did not expect body to contain {} bytes", actual_length);
+                        let msg = format!("did not expect body to contain {actual_length} bytes");
                         break Err(Error::data_loss(msg));
                     }
 
@@ -385,7 +385,7 @@ impl AudioFileFetch {
         let complete_tx = self.complete_tx.take();
 
         if let Some(mut output) = output {
-            output.seek(SeekFrom::Start(0))?;
+            output.rewind()?;
             if let Some(complete_tx) = complete_tx {
                 complete_tx
                     .send(output)

audio/src/range_set.rs

@@ -35,7 +35,7 @@ impl fmt::Display for RangeSet {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "(")?;
         for range in self.ranges.iter() {
-            write!(f, "{}", range)?;
+            write!(f, "{range}")?;
         }
         write!(f, ")")
     }

core/build.rs

@@ -22,5 +22,5 @@ fn main() {
             .collect(),
     };
 
-    println!("cargo:rustc-env=LIBRESPOT_BUILD_ID={}", build_id);
+    println!("cargo:rustc-env=LIBRESPOT_BUILD_ID={build_id}");
 }

core/src/apresolve.rs

@@ -137,17 +137,13 @@ impl ApResolver {
                 "spclient" => inner.data.spclient.pop_front(),
                 _ => {
                     return Err(Error::unimplemented(format!(
-                        "No implementation to resolve access point {}",
-                        endpoint
+                        "No implementation to resolve access point {endpoint}"
                     )))
                 }
             };
 
             let access_point = access_point.ok_or_else(|| {
-                Error::unavailable(format!(
-                    "No access point available for endpoint {}",
-                    endpoint
-                ))
+                Error::unavailable(format!("No access point available for endpoint {endpoint}"))
             })?;
 
             Ok(access_point)

core/src/cache.rs

@@ -328,7 +328,7 @@ impl Cache {
         if let Some(location) = &self.credentials_location {
             let result = File::create(location).and_then(|mut file| {
                 let data = serde_json::to_string(cred)?;
-                write!(file, "{}", data)
+                write!(file, "{data}")
             });
 
             if let Err(e) = result {
@@ -360,7 +360,7 @@ impl Cache {
 
     pub fn save_volume(&self, volume: u16) {
         if let Some(ref location) = self.volume_location {
-            let result = File::create(location).and_then(|mut file| write!(file, "{}", volume));
+            let result = File::create(location).and_then(|mut file| write!(file, "{volume}"));
             if let Err(e) = result {
                 warn!("Cannot save volume to cache: {}", e);
             }

core/src/mercury/mod.rs

@@ -263,7 +263,7 @@ impl MercuryManager {
             let mut found = false;
 
             self.lock(|inner| {
-                inner.subscriptions.retain(|&(ref prefix, ref sub)| {
+                inner.subscriptions.retain(|(prefix, sub)| {
                     if encoded_uri.starts_with(prefix) {
                         found = true;
 

core/src/proxytunnel.rs

@@ -38,7 +38,7 @@ pub async fn proxy_connect<T: AsyncRead + AsyncWrite + Unpin>(
                 Some(200) => Ok(proxy_connection), // Proxy says all is well
                 Some(code) => {
                     let reason = response.reason.unwrap_or("no reason");
-                    let msg = format!("Proxy responded with {}: {}", code, reason);
+                    let msg = format!("Proxy responded with {code}: {reason}");
                     Err(io::Error::new(io::ErrorKind::Other, msg))
                 }
                 None => Err(io::Error::new(

core/src/spclient.rs

@@ -125,8 +125,7 @@ impl SpClient {
         let suffix = loop {
             if now.elapsed().as_secs() >= TIMEOUT {
                 return Err(Error::deadline_exceeded(format!(
-                    "{} seconds expired",
-                    TIMEOUT
+                    "{TIMEOUT} seconds expired"
                 )));
             }
 
@@ -282,8 +281,7 @@ impl SpClient {
                         let ctx = vec![];
                         let prefix = hex::decode(&hash_cash_challenge.prefix).map_err(|e| {
                             Error::failed_precondition(format!(
-                                "Unable to decode hash cash challenge: {}",
-                                e
+                                "Unable to decode hash cash challenge: {e}"
                             ))
                         })?;
                         let length = hash_cash_challenge.length;
@@ -339,8 +337,7 @@ impl SpClient {
                             response = self.client_token_request(&request).await?;
                         } else {
                             return Err(Error::failed_precondition(format!(
-                                "Unable to solve any of {} hash cash challenges",
-                                MAX_TRIES
+                                "Unable to solve any of {MAX_TRIES} hash cash challenges"
                             )));
                         }
                     } else {
@@ -350,8 +347,7 @@ impl SpClient {
 
                 Some(unknown) => {
                     return Err(Error::unimplemented(format!(
-                        "Unknown client token response type: {:?}",
-                        unknown
+                        "Unknown client token response type: {unknown:?}"
                     )))
                 }
                 None => return Err(Error::failed_precondition("No client token response type")),
@@ -595,20 +591,20 @@ impl SpClient {
         playlist_limit: Option<u32>,
         artist_limit: Option<u32>,
     ) -> SpClientResult {
-        let mut endpoint = format!("/user-profile-view/v3/profile/{}", username);
+        let mut endpoint = format!("/user-profile-view/v3/profile/{username}");
 
         if playlist_limit.is_some() || artist_limit.is_some() {
             let _ = write!(endpoint, "?");
 
             if let Some(limit) = playlist_limit {
-                let _ = write!(endpoint, "playlist_limit={}", limit);
+                let _ = write!(endpoint, "playlist_limit={limit}");
                 if artist_limit.is_some() {
                     let _ = write!(endpoint, "&");
                 }
             }
 
             if let Some(limit) = artist_limit {
-                let _ = write!(endpoint, "artist_limit={}", limit);
+                let _ = write!(endpoint, "artist_limit={limit}");
             }
         }
 
@@ -617,14 +613,14 @@ impl SpClient {
     }
 
     pub async fn get_user_followers(&self, username: &str) -> SpClientResult {
-        let endpoint = format!("/user-profile-view/v3/profile/{}/followers", username);
+        let endpoint = format!("/user-profile-view/v3/profile/{username}/followers");
 
         self.request_as_json(&Method::GET, &endpoint, None, None)
             .await
     }
 
     pub async fn get_user_following(&self, username: &str) -> SpClientResult {
-        let endpoint = format!("/user-profile-view/v3/profile/{}/following", username);
+        let endpoint = format!("/user-profile-view/v3/profile/{username}/following");
 
         self.request_as_json(&Method::GET, &endpoint, None, None)
             .await
@@ -657,14 +653,11 @@ impl SpClient {
         previous_tracks: Vec<SpotifyId>,
         autoplay: bool,
     ) -> SpClientResult {
-        let mut endpoint = format!(
-            "/radio-apollo/v3/{}/{}?autoplay={}",
-            scope, context_uri, autoplay,
-        );
+        let mut endpoint = format!("/radio-apollo/v3/{scope}/{context_uri}?autoplay={autoplay}");
 
         // Spotify has a default of 50
         if let Some(count) = count {
-            let _ = write!(endpoint, "&count={}", count);
+            let _ = write!(endpoint, "&count={count}");
         }
 
         let previous_track_str = previous_tracks
@@ -674,7 +667,7 @@ impl SpClient {
             .join(",");
         // better than checking `previous_tracks.len() > 0` because the `filter_map` could still return 0 items
         if !previous_track_str.is_empty() {
-            let _ = write!(endpoint, "&prev_tracks={}", previous_track_str);
+            let _ = write!(endpoint, "&prev_tracks={previous_track_str}");
         }
 
         self.request_as_json(&Method::GET, &endpoint, None, None)

metadata/src/request.rs

@@ -15,10 +15,10 @@ pub trait MercuryRequest {
             Some(_) => "&",
             None => "?",
         };
-        let _ = write!(metrics_uri, "{}country={}", separator, session.country());
+        let _ = write!(metrics_uri, "{separator}country={}", session.country());
 
         if let Some(product) = session.get_user_attribute("type") {
-            let _ = write!(metrics_uri, "&product={}", product);
+            let _ = write!(metrics_uri, "&product={product}");
         }
 
         trace!("Requesting {}", metrics_uri);
@@ -28,7 +28,7 @@ pub trait MercuryRequest {
         match response.payload.first() {
             Some(data) => {
                 let data = data.to_vec().into();
-                trace!("Received metadata: {:?}", data);
+                trace!("Received metadata: {data:?}");
                 Ok(data)
             }
             None => Err(Error::unavailable(MetadataError::Empty)),

playback/src/audio_backend/alsa.rs

@@ -131,12 +131,12 @@ fn list_compatible_devices() -> SinkResult<()> {
                                 AudioFormat::F64,
                             ] {
                                 if hwp.test_format(Format::from(*f)).is_ok() {
-                                    supported_formats.push(format!("{:?}", f));
+                                    supported_formats.push(format!("{f:?}"));
                                 }
                             }
 
                             if !supported_formats.is_empty() {
-                                println!("\tDevice:\n\n\t\t{}\n", name);
+                                println!("\tDevice:\n\n\t\t{name}\n");
 
                                 println!(
                                     "\tDescription:\n\n\t\t{}\n",

playback/src/audio_backend/gstreamer.rs

@@ -27,7 +27,7 @@ pub struct GstreamerSink {
 
 impl Open for GstreamerSink {
     fn open(device: Option<String>, format: AudioFormat) -> Self {
-        info!("Using GStreamer sink with format: {:?}", format);
+        info!("Using GStreamer sink with format: {format:?}");
         gst::init().expect("failed to init GStreamer!");
 
         let gst_format = match format {

playback/src/audio_backend/jackaudio.rs

@@ -40,7 +40,7 @@ impl ProcessHandler for JackData {
 impl Open for JackSink {
     fn open(client_name: Option<String>, format: AudioFormat) -> Self {
         if format != AudioFormat::F32 {
-            warn!("JACK currently does not support {:?} output", format);
+            warn!("JACK currently does not support {format:?} output");
         }
         info!("Using JACK sink with format {:?}", AudioFormat::F32);
 

playback/src/audio_backend/portaudio.rs

@@ -27,7 +27,7 @@ fn output_devices() -> Box<dyn Iterator<Item = (DeviceIndex, DeviceInfo)>> {
     let count = portaudio_rs::device::get_count().unwrap();
     let devices = (0..count)
         .filter_map(|idx| portaudio_rs::device::get_info(idx).map(|info| (idx, info)))
-        .filter(|&(_, ref info)| info.max_output_channels > 0);
+        .filter(|(_, info)| info.max_output_channels > 0);
 
     Box::new(devices)
 }
@@ -46,13 +46,13 @@ fn list_outputs() {
 
 fn find_output(device: &str) -> Option<DeviceIndex> {
     output_devices()
-        .find(|&(_, ref info)| info.name == device)
+        .find(|(_, info)| info.name == device)
         .map(|(idx, _)| idx)
 }
 
 impl<'a> Open for PortAudioSink<'a> {
     fn open(device: Option<String>, format: AudioFormat) -> PortAudioSink<'a> {
-        info!("Using PortAudio sink with format: {:?}", format);
+        info!("Using PortAudio sink with format: {format:?}");
 
         portaudio_rs::initialize().unwrap();
 
@@ -88,7 +88,7 @@ impl<'a> Open for PortAudioSink<'a> {
             AudioFormat::S32 => open_sink!(Self::S32, i32),
             AudioFormat::S16 => open_sink!(Self::S16, i16),
             _ => {
-                unimplemented!("PortAudio currently does not support {:?} output", format)
+                unimplemented!("PortAudio currently does not support {format:?} output")
             }
         }
     }
@@ -168,7 +168,7 @@ impl<'a> Sink for PortAudioSink<'a> {
         match result {
             Ok(_) => (),
             Err(portaudio_rs::PaError::OutputUnderflowed) => error!("PortAudio write underflow"),
-            Err(e) => panic!("PortAudio error {}", e),
+            Err(e) => panic!("PortAudio error {e}"),
         };
 
         Ok(())

playback/src/audio_backend/pulseaudio.rs

@@ -64,7 +64,7 @@ impl Open for PulseAudioSink {
             actual_format = AudioFormat::F32;
         }
 
-        info!("Using PulseAudioSink with format: {:?}", actual_format);
+        info!("Using PulseAudioSink with format: {actual_format:?}");
 
         Self {
             sink: None,

playback/src/audio_backend/rodio.rs

@@ -69,11 +69,11 @@ fn list_formats(device: &rodio::Device) {
     match device.default_output_config() {
         Ok(cfg) => {
             debug!("  Default config:");
-            debug!("    {:?}", cfg);
+            debug!("    {cfg:?}");
         }
         Err(e) => {
             // Use loglevel debug, since even the output is only debug
-            debug!("Error getting default rodio::Sink config: {}", e);
+            debug!("Error getting default rodio::Sink config: {e}");
         }
     };
 
@@ -81,17 +81,17 @@ fn list_formats(device: &rodio::Device) {
         Ok(mut cfgs) => {
             if let Some(first) = cfgs.next() {
                 debug!("  Available configs:");
-                debug!("    {:?}", first);
+                debug!("    {first:?}");
             } else {
                 return;
             }
 
             for cfg in cfgs {
-                debug!("    {:?}", cfg);
+                debug!("    {cfg:?}");
             }
         }
         Err(e) => {
-            debug!("Error getting supported rodio::Sink configs: {}", e);
+            debug!("Error getting supported rodio::Sink configs: {e}");
         }
     }
 }
@@ -117,11 +117,11 @@ fn list_outputs(host: &cpal::Host) -> Result<(), cpal::DevicesError> {
         match device.name() {
             Ok(name) if Some(&name) == default_device_name.as_ref() => (),
             Ok(name) => {
-                println!("  {}", name);
+                println!("  {name}");
                 list_formats(&device);
             }
             Err(e) => {
-                warn!("Cannot get device name: {}", e);
+                warn!("Cannot get device name: {e}");
                 println!("   [unknown name]");
                 list_formats(&device);
             }
@@ -139,7 +139,7 @@ fn create_sink(
         Some("?") => match list_outputs(host) {
             Ok(()) => exit(0),
             Err(e) => {
-                error!("{}", e);
+                error!("{e}");
                 exit(1);
             }
         },
@@ -166,8 +166,7 @@ fn create_sink(
 
 pub fn open(host: cpal::Host, device: Option<String>, format: AudioFormat) -> RodioSink {
     info!(
-        "Using Rodio sink with format {:?} and cpal host: {}",
-        format,
+        "Using Rodio sink with format {format:?} and cpal host: {}",
         host.id().name()
     );
 

playback/src/audio_backend/sdl.rs

@@ -45,7 +45,7 @@ impl Open for SdlSink {
             AudioFormat::S32 => open_sink!(Self::S32, i32),
             AudioFormat::S16 => open_sink!(Self::S16, i16),
             _ => {
-                unimplemented!("SDL currently does not support {:?} output", format)
+                unimplemented!("SDL currently does not support {format:?} output")
             }
         }
     }

playback/src/decoder/passthrough_decoder.rs

@@ -49,8 +49,7 @@ impl<R: Read + Seek> PassthroughDecoder<R> {
     pub fn new(rdr: R, format: AudioFileFormat) -> DecoderResult<Self> {
         if !AudioFiles::is_ogg_vorbis(format) {
             return Err(DecoderError::PassthroughDecoder(format!(
-                "Passthrough decoder is not implemented for format {:?}",
-                format
+                "Passthrough decoder is not implemented for format {format:?}"
             )));
         }
 
@@ -60,7 +59,7 @@ impl<R: Read + Seek> PassthroughDecoder<R> {
             .map_err(|e| DecoderError::PassthroughDecoder(e.to_string()))?;
         let stream_serial = since_epoch.as_millis() as u32;
 
-        info!("Starting passthrough track with serial {}", stream_serial);
+        info!("Starting passthrough track with serial {stream_serial}");
 
         // search for ident, comment, setup
         let ident = get_header(1, &mut rdr)?;

playback/src/decoder/symphonia_decoder.rs

@@ -51,8 +51,7 @@ impl SymphoniaDecoder {
             Box::new(Mp3Reader::try_new(mss, &format_opts)?)
         } else {
             return Err(DecoderError::SymphoniaDecoder(format!(
-                "Unsupported format: {:?}",
-                file_format
+                "Unsupported format: {file_format:?}"
             )));
         };
 
@@ -67,8 +66,7 @@ impl SymphoniaDecoder {
             Box::new(Mp3Decoder::try_new(&track.codec_params, &decoder_opts)?)
         } else {
             return Err(DecoderError::SymphoniaDecoder(format!(
-                "Unsupported decoder: {:?}",
-                file_format
+                "Unsupported decoder: {file_format:?}"
             )));
         };
 
@@ -77,8 +75,7 @@ impl SymphoniaDecoder {
         })?;
         if rate != SAMPLE_RATE {
             return Err(DecoderError::SymphoniaDecoder(format!(
-                "Unsupported sample rate: {}",
-                rate
+                "Unsupported sample rate: {rate}"
             )));
         }
 
@@ -87,8 +84,7 @@ impl SymphoniaDecoder {
         })?;
         if channels.count() != NUM_CHANNELS as usize {
             return Err(DecoderError::SymphoniaDecoder(format!(
-                "Unsupported number of channels: {}",
-                channels
+                "Unsupported number of channels: {channels}"
             )));
         }
 
@@ -215,7 +211,7 @@ impl AudioDecoder for SymphoniaDecoder {
                 Err(Error::DecodeError(_)) => {
                     // The packet failed to decode due to corrupted or invalid data, get a new
                     // packet and try again.
-                    warn!("Skipping malformed audio packet at {} ms", position_ms);
+                    warn!("Skipping malformed audio packet at {position_ms} ms");
                     skipped = true;
                     continue;
                 }

src/main.rs

@@ -46,10 +46,7 @@ fn usage(program: &str, opts: &getopts::Options) -> String {
     let repo_home = env!("CARGO_PKG_REPOSITORY");
     let desc = env!("CARGO_PKG_DESCRIPTION");
     let version = get_version_string();
-    let brief = format!(
-        "{}\n\n{}\n\n{}\n\nUsage: {} [<Options>]",
-        version, desc, repo_home, program
-    );
+    let brief = format!("{version}\n\n{desc}\n\n{repo_home}\n\nUsage: {program} [<Options>]");
     opts.usage(&brief)
 }
 
@@ -87,9 +84,9 @@ fn list_backends() {
     println!("Available backends: ");
     for (&(name, _), idx) in BACKENDS.iter().zip(0..) {
         if idx == 0 {
-            println!("- {} (default)", name);
+            println!("- {name} (default)");
         } else {
-            println!("- {}", name);
+            println!("- {name}");
         }
     }
 }
@@ -593,8 +590,7 @@ fn get_setup() -> Setup {
             Ok(valid) => Some(valid),
             Err(s) => {
                 eprintln!(
-                    "Command line argument was not valid Unicode and will not be evaluated: {:?}",
-                    s
+                    "Command line argument was not valid Unicode and will not be evaluated: {s:?}"
                 );
                 None
             }
@@ -604,7 +600,7 @@ fn get_setup() -> Setup {
     let matches = match opts.parse(&args[1..]) {
         Ok(m) => m,
         Err(e) => {
-            eprintln!("Error parsing command line options: {}", e);
+            eprintln!("Error parsing command line options: {e}");
             println!("\n{}", usage(&args[0], &opts));
             exit(1);
         }
@@ -624,7 +620,7 @@ fn get_setup() -> Setup {
                 match v.into_string() {
                     Ok(value) => Some((key, value)),
                     Err(s) => {
-                        eprintln!("Environment variable was not valid Unicode and will not be evaluated: {}={:?}", key, s);
+                        eprintln!("Environment variable was not valid Unicode and will not be evaluated: {key}={s:?}");
                         None
                     }
                 }
@@ -669,11 +665,11 @@ fn get_setup() -> Setup {
 
         for (k, v) in &env_vars {
             if matches!(k.as_str(), "LIBRESPOT_PASSWORD" | "LIBRESPOT_USERNAME") {
-                trace!("\t\t{}=\"XXXXXXXX\"", k);
+                trace!("\t\t{k}=\"XXXXXXXX\"");
             } else if v.is_empty() {
-                trace!("\t\t{}=", k);
+                trace!("\t\t{k}=");
             } else {
-                trace!("\t\t{}=\"{}\"", k, v);
+                trace!("\t\t{k}=\"{v}\"");
             }
         }
     }
@@ -702,13 +698,13 @@ fn get_setup() -> Setup {
             {
                 if matches!(opt, PASSWORD | PASSWORD_SHORT | USERNAME | USERNAME_SHORT) {
                     // Don't log creds.
-                    trace!("\t\t{} \"XXXXXXXX\"", opt);
+                    trace!("\t\t{opt} \"XXXXXXXX\"");
                 } else {
                     let value = matches.opt_str(opt).unwrap_or_default();
                     if value.is_empty() {
-                        trace!("\t\t{}", opt);
+                        trace!("\t\t{opt}");
                     } else {
-                        trace!("\t\t{} \"{}\"", opt, value);
+                        trace!("\t\t{opt} \"{value}\"");
                     }
                 }
             }
@@ -736,19 +732,19 @@ fn get_setup() -> Setup {
 
     let invalid_error_msg =
         |long: &str, short: &str, invalid: &str, valid_values: &str, default_value: &str| {
-            error!("Invalid `--{}` / `-{}`: \"{}\"", long, short, invalid);
+            error!("Invalid `--{long}` / `-{short}`: \"{invalid}\"");
 
             if !valid_values.is_empty() {
-                println!("Valid `--{}` / `-{}` values: {}", long, short, valid_values);
+                println!("Valid `--{long}` / `-{short}` values: {valid_values}");
             }
 
             if !default_value.is_empty() {
-                println!("Default: {}", default_value);
+                println!("Default: {default_value}");
             }
         };
 
     let empty_string_error_msg = |long: &str, short: &str| {
-        error!("`--{}` / `-{}` can not be an empty string", long, short);
+        error!("`--{long}` / `-{short}` can not be an empty string");
         exit(1);
     };
 
@@ -1095,7 +1091,7 @@ fn get_setup() -> Setup {
                 match cached_creds {
                     Some(creds) if username == creds.username => Some(creds),
                     _ => {
-                        let prompt = &format!("Password for {}: ", username);
+                        let prompt = &format!("Password for {username}: ");
                         match rpassword::prompt_password(prompt) {
                             Ok(password) => {
                                 if !password.is_empty() {