fix clippy warnings

src/transcription_downloader.rs

@@ -66,9 +66,7 @@ impl LocalTranscriptionDownloader {
 
     /// Gets the name of the directory where the asset should be downloaded.
     fn download_dir(link: &TranscriptionLink) -> String {
-        let input = match link {
-            TranscriptionLink::YouTube(yt_link) => yt_link,
-        };
+        let TranscriptionLink::YouTube(input) = link;
         let mut hasher = Sha1::new();
         hasher.update(input.as_bytes());
         let hash = hasher.finalize();
@@ -84,25 +82,23 @@ impl LocalTranscriptionDownloader {
 
     /// Gets the path to the asset file.
     fn download_path(link: &TranscriptionLink) -> PathBuf {
-        Path::new(&Self::download_dir(&link)).join(Self::download_file(link))
+        Path::new(&Self::download_dir(link)).join(Self::download_file(link))
     }
 
     /// Gets the full path to the asset file with the download directory prepended.
     fn full_download_path(&self, link: &TranscriptionLink) -> Option<PathBuf> {
-        match self.preferences.download_path {
-            Some(ref download_path) => {
-                Some(Path::new(download_path).join(Self::download_path(link)))
-            }
-            None => None,
-        }
+        self.preferences
+            .download_path
+            .as_ref()
+            .map(|download_path| Path::new(download_path).join(Self::download_path(link)))
     }
 
     /// Gets the full path to the asset file with the alias directory prepended.
     fn full_alias_path(&self, link: &TranscriptionLink) -> Option<PathBuf> {
-        match self.preferences.download_path_alias {
-            Some(ref alias_path) => Some(Path::new(alias_path).join(Self::download_path(link))),
-            None => None,
-        }
+        self.preferences
+            .download_path_alias
+            .as_ref()
+            .map(|path_alias| Path::new(path_alias).join(Self::download_path(link)))
     }
 
     /// Verifies that a binary is installed. The argument should be something simple, like a version