Fix clippy hints

* https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_else_if
  (-D clippy::collapsible-else-if)
* https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
  (-D clippy::needless-borrow)
* https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
  (-D clippy::into-iter-on-ref)
* https://rust-lang.github.io/rust-clippy/master/index.html#map_flatten
  (-D clippy::map-flatten)
* https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
  (-D clippy::len-zero)

src/ilias.rs

@@ -45,12 +45,9 @@ pub struct ILIAS {
 fn error_is_http2(error: &reqwest::Error) -> bool {
 	error
 		.source() // hyper::Error
-		.map(|x| x.source()) // h2::Error
+		.and_then(|x| x.source()) // h2::Error
-		.flatten()
+		.and_then(|x| x.downcast_ref::<h2::Error>())
-		.map(|x| x.downcast_ref::<h2::Error>())
+		.and_then(|x| x.reason())
-		.flatten()
-		.map(|x| x.reason())
-		.flatten()
 		.map(|x| x == h2::Reason::NO_ERROR)
 		.unwrap_or(false)
 }
@@ -349,8 +346,8 @@ impl Object {
 			| Presentation { name, .. }
 			| ExerciseHandler { name, .. }
 			| PluginDispatch { name, .. }
-			| Generic { name, .. } => &name,
+			| Generic { name, .. } => name,
-			Thread { url } => &url.thr_pk.as_ref().unwrap(),
+			Thread { url } => url.thr_pk.as_ref().unwrap(),
 			Video { url } => &url.url,
 			Dashboard { url } => &url.url,
 		}
@@ -371,7 +368,7 @@ impl Object {
 			| ExerciseHandler { url, .. }
 			| PluginDispatch { url, .. }
 			| Video { url }
-			| Generic { url, .. } => &url,
+			| Generic { url, .. } => url,
 		}
 	}
 

src/ilias/course.rs

@@ -28,12 +28,12 @@ pub async fn download(path: PathBuf, ilias: Arc<ILIAS>, url: &URL, name: &str) -
 					return Ok(()); // ignore groups we are not in
 				}
 				warning!(name, "falling back to incomplete course content extractor!", e);
-				let (items, main_text, _) = ilias.get_course_content(&url).await?;
+				let (items, main_text, _) = ilias.get_course_content(url).await?;
 				(items, main_text)
 			},
 		}
 	} else {
-		let (items, main_text, _) = ilias.get_course_content(&url).await?;
+		let (items, main_text, _) = ilias.get_course_content(url).await?;
 		(items, main_text)
 	};
 	if ilias.opt.save_ilias_pages {

src/ilias/file.rs

@@ -17,6 +17,6 @@ pub async fn download(path: &Path, relative_path: &Path, ilias: Arc<ILIAS>, url:
 	}
 	let data = ilias.download(&url.url).await?;
 	log!(0, "Writing {}", relative_path.to_string_lossy());
-	write_stream_to_file(&path, data.bytes_stream()).await?;
+	write_stream_to_file(path, data.bytes_stream()).await?;
 	Ok(())
 }

src/ilias/folder.rs

@@ -17,7 +17,7 @@ static EXPAND_LINK: Lazy<Regex> = Lazy::new(|| Regex::new("expand=\\d").unwrap()
 
 #[async_recursion]
 pub async fn download(path: &Path, ilias: Arc<ILIAS>, url: &URL) -> Result<()> {
-	let content = ilias.get_course_content(&url).await?;
+	let content = ilias.get_course_content(url).await?;
 
 	// expand all sessions
 	for href in content.2 {

src/ilias/video.rs

@@ -34,7 +34,7 @@ pub async fn download(path: &Path, relative_path: &Path, ilias: Arc<ILIAS>, url:
 		let json = &json_capture.next().context("xoct player json not found")?[1];
 		log!(2, "{}", json);
 		let json = json.split(",\n").next().context("invalid xoct player json")?;
-		serde_json::from_str(&json.trim())?
+		serde_json::from_str(json.trim())?
 	};
 	log!(2, "{}", json);
 	let streams = json
@@ -49,8 +49,7 @@ pub async fn download(path: &Path, relative_path: &Path, ilias: Arc<ILIAS>, url:
 			.as_str()
 			.context("video src not string")?;
 		download_to_path(&ilias, path, relative_path, url).await?;
-	} else {
+	} else if !ilias.opt.combine_videos {
-		if !ilias.opt.combine_videos {
 		fs::create_dir(path).await.context("failed to create video directory")?;
 		download_all(path, streams, ilias, relative_path).await?;
 	} else {
@@ -82,19 +81,18 @@ pub async fn download(path: &Path, relative_path: &Path, ilias: Arc<ILIAS>, url:
 			error!(format!("check this directory: {}", dir.into_path().display()));
 			error!(format!("ffmpeg command: {}", arguments.join(" ")));
 		}
-		};
 	}
 	Ok(())
 }
 
 async fn download_all(
 	path: &Path,
-	streams: &Vec<serde_json::Value>,
+	streams: &[serde_json::Value],
 	ilias: Arc<ILIAS>,
 	relative_path: &Path,
 ) -> Result<Vec<PathBuf>> {
 	let mut paths = Vec::new();
-	for (i, stream) in streams.into_iter().enumerate() {
+	for (i, stream) in streams.iter().enumerate() {
 		let url = stream
 			.pointer("/sources/mp4/0/src")
 			.context("video src not found")?
@@ -126,9 +124,9 @@ async fn download_to_path(ilias: &ILIAS, path: &Path, relative_path: &Path, url:
 			}
 		}
 	} else {
-		let resp = ilias.download(&url).await?;
+		let resp = ilias.download(url).await?;
 		log!(0, "Writing {}", relative_path.to_string_lossy());
-		write_stream_to_file(&path, resp.bytes_stream()).await?;
+		write_stream_to_file(path, resp.bytes_stream()).await?;
 	}
 	Ok(())
 }

src/ilias/weblink.rs

@@ -27,7 +27,7 @@ pub async fn download(path: &Path, relative_path: &Path, ilias: Arc<ILIAS>, url:
 	if url.starts_with(ILIAS_URL) {
 		// is a link list
 		if fs::metadata(&path).await.is_err() {
-			create_dir(&path).await?;
+			create_dir(path).await?;
 			log!(0, "Writing {}", relative_path.to_string_lossy());
 		}
 

src/iliasignore.rs

@@ -24,7 +24,7 @@ impl IliasIgnore {
 			if let Some(err) = error {
 				warning!(err);
 			}
-			if ignore.len() > 0 {
+			if !ignore.is_empty() {
 				ignores.push(IgnoreFile {
 					ignore,
 					prefix: prefix.iter().fold(OsString::new(), |mut acc, el| {