Fix clippy lints

Author: roderickvd

core/build.rs

@@ -8,17 +8,14 @@ fn main() {
     flags.toggle(ConstantsFlags::REBUILD_ON_HEAD_CHANGE);
     generate_cargo_keys(ConstantsFlags::all()).expect("Unable to generate the cargo keys!");
 
-    let build_id: String;
-    match env::var("SOURCE_DATE_EPOCH") {
-        Ok(val) => build_id = val,
-        Err(_) => {
-            build_id = rand::thread_rng()
-                .sample_iter(Alphanumeric)
-                .take(8)
-                .map(char::from)
-                .collect()
-        }
-    }
+    let build_id = match env::var("SOURCE_DATE_EPOCH") {
+        Ok(val) => val,
+        Err(_) => rand::thread_rng()
+            .sample_iter(Alphanumeric)
+            .take(8)
+            .map(char::from)
+            .collect(),
+    };
 
     println!("cargo:rustc-env=LIBRESPOT_BUILD_ID={}", build_id);
 }

discovery/Cargo.toml

@@ -10,7 +10,6 @@ edition = "2018"
 [dependencies]
 aes-ctr = "0.6"
 base64 = "0.13"
-cfg-if = "1.0"
 form_urlencoded = "1.0"
 futures-core = "0.3"
 hmac = "0.11"

discovery/src/lib.rs

@@ -16,7 +16,6 @@ use std::io;
 use std::pin::Pin;
 use std::task::{Context, Poll};
 
-use cfg_if::cfg_if;
 use futures_core::Stream;
 use librespot_core as core;
 use thiserror::Error;
@@ -100,29 +99,24 @@ impl Builder {
         let name = self.server_config.name.clone().into_owned();
         let server = DiscoveryServer::new(self.server_config, &mut port)?;
 
-        let svc;
-
-        cfg_if! {
-            if #[cfg(feature = "with-dns-sd")] {
-                svc = dns_sd::DNSService::register(
-                    Some(name.as_ref()),
-                    "_spotify-connect._tcp",
-                    None,
-                    None,
-                    port,
-                    &["VERSION=1.0", "CPath=/"],
-                ).map_err(|e| Error::DnsSdError(io::Error::new(io::ErrorKind::Unsupported, e)))?;
-
-            } else {
-                let responder = libmdns::Responder::spawn(&tokio::runtime::Handle::current())?;
-                svc = responder.register(
-                    "_spotify-connect._tcp".to_owned(),
-                    name,
-                    port,
-                    &["VERSION=1.0", "CPath=/"],
-                )
-            }
-        };
+        #[cfg(feature = "with-dns-sd")]
+        let svc = dns_sd::DNSService::register(
+            Some(name.as_ref()),
+            "_spotify-connect._tcp",
+            None,
+            None,
+            port,
+            &["VERSION=1.0", "CPath=/"],
+        )
+        .map_err(|e| Error::DnsSdError(io::Error::new(io::ErrorKind::Unsupported, e)))?;
+
+        #[cfg(not(feature = "with-dns-sd"))]
+        let svc = libmdns::Responder::spawn(&tokio::runtime::Handle::current())?.register(
+            "_spotify-connect._tcp".to_owned(),
+            name,
+            port,
+            &["VERSION=1.0", "CPath=/"],
+        );
 
         Ok(Discovery { server, _svc: svc })
     }

playback/src/mixer/alsamixer.rs

@@ -191,7 +191,7 @@ impl Mixer for AlsaMixer {
             mapped_volume = LogMapping::linear_to_mapped(mapped_volume, self.db_range);
         }
 
-        self.config.volume_ctrl.from_mapped(mapped_volume)
+        self.config.volume_ctrl.to_unmapped(mapped_volume)
     }
 
     fn set_volume(&self, volume: u16) {

playback/src/mixer/mappings.rs

@@ -3,7 +3,7 @@ use crate::player::db_to_ratio;
 
 pub trait MappedCtrl {
     fn to_mapped(&self, volume: u16) -> f64;
-    fn from_mapped(&self, mapped_volume: f64) -> u16;
+    fn to_unmapped(&self, mapped_volume: f64) -> u16;
 
     fn db_range(&self) -> f64;
     fn set_db_range(&mut self, new_db_range: f64);
@@ -49,7 +49,7 @@ impl MappedCtrl for VolumeCtrl {
         mapped_volume
     }
 
-    fn from_mapped(&self, mapped_volume: f64) -> u16 {
+    fn to_unmapped(&self, mapped_volume: f64) -> u16 {
         // More than just an optimization, this ensures that zero mapped volume
         // is unmapped to non-negative real numbers (otherwise the log and cubic
         // equations would respectively return -inf and -1/9.)

playback/src/mixer/softmixer.rs

@@ -26,7 +26,7 @@ impl Mixer for SoftMixer {
 
     fn volume(&self) -> u16 {
         let mapped_volume = f64::from_bits(self.volume.load(Ordering::Relaxed));
-        self.volume_ctrl.from_mapped(mapped_volume)
+        self.volume_ctrl.to_unmapped(mapped_volume)
     }
 
     fn set_volume(&self, volume: u16) {

src/main.rs

@@ -586,7 +586,7 @@ fn get_setup() -> Setup {
 
     let stripped_env_key = |k: &str| {
         k.trim_start_matches("LIBRESPOT_")
-            .replace("_", "-")
+            .replace('_', "-")
             .to_lowercase()
     };