Apply clippy::needless_borrow

src/book/book.rs

@@ -277,7 +277,7 @@ fn load_chapter<P: AsRef<Path>>(
         }
 
         let stripped = location
-            .strip_prefix(&src_dir)
+            .strip_prefix(src_dir)
             .expect("Chapters are always inside a book");
 
         Chapter::new(&link.name, content, stripped, parent_names.clone())

src/book/init.rs

@@ -198,8 +198,7 @@ impl BookBuilder {
             writeln!(f, "- [Chapter 1](./chapter_1.md)")?;
 
             let chapter_1 = src_dir.join("chapter_1.md");
-            let mut f =
+            let mut f = File::create(chapter_1).with_context(|| "Unable to create chapter_1.md")?;
-                File::create(&chapter_1).with_context(|| "Unable to create chapter_1.md")?;
             writeln!(f, "# Chapter 1")?;
         } else {
             trace!("Existing summary found, no need to create stub files.");
@@ -212,10 +211,10 @@ impl BookBuilder {
         fs::create_dir_all(&self.root)?;
 
         let src = self.root.join(&self.config.book.src);
-        fs::create_dir_all(&src)?;
+        fs::create_dir_all(src)?;
 
         let build = self.root.join(&self.config.build.build_dir);
-        fs::create_dir_all(&build)?;
+        fs::create_dir_all(build)?;
 
         Ok(())
     }

src/book/mod.rs

@@ -99,7 +99,7 @@ impl MDBook {
         let root = book_root.into();
 
         let src_dir = root.join(&config.book.src);
-        let book = book::load_book(&src_dir, &config.build)?;
+        let book = book::load_book(src_dir, &config.build)?;
 
         let renderers = determine_renderers(&config);
         let preprocessors = determine_preprocessors(&config)?;
@@ -122,7 +122,7 @@ impl MDBook {
         let root = book_root.into();
 
         let src_dir = root.join(&config.book.src);
-        let book = book::load_book_from_disk(&summary, &src_dir)?;
+        let book = book::load_book_from_disk(&summary, src_dir)?;
 
         let renderers = determine_renderers(&config);
         let preprocessors = determine_preprocessors(&config)?;
@@ -309,7 +309,7 @@ impl MDBook {
                 info!("Testing chapter '{}': {:?}", ch.name, chapter_path);
 
                 // write preprocessed file to tempdir
-                let path = temp_dir.path().join(&chapter_path);
+                let path = temp_dir.path().join(chapter_path);
                 let mut tmpf = utils::fs::create_file(&path)?;
                 tmpf.write_all(ch.content.as_bytes())?;
 
@@ -319,13 +319,13 @@ impl MDBook {
                 if let Some(edition) = self.config.rust.edition {
                     match edition {
                         RustEdition::E2015 => {
-                            cmd.args(&["--edition", "2015"]);
+                            cmd.args(["--edition", "2015"]);
                         }
                         RustEdition::E2018 => {
-                            cmd.args(&["--edition", "2018"]);
+                            cmd.args(["--edition", "2018"]);
                         }
                         RustEdition::E2021 => {
-                            cmd.args(&["--edition", "2021"]);
+                            cmd.args(["--edition", "2021"]);
                         }
                     }
                 }

src/cmd/build.rs

@@ -16,7 +16,7 @@ pub fn make_subcommand() -> Command {
 // Build command implementation
 pub fn execute(args: &ArgMatches) -> Result<()> {
     let book_dir = get_book_dir(args);
-    let mut book = MDBook::load(&book_dir)?;
+    let mut book = MDBook::load(book_dir)?;
 
     if let Some(dest_dir) = args.get_one::<PathBuf>("dest-dir") {
         book.config.build.build_dir = dest_dir.into();

src/cmd/clean.rs

@@ -16,7 +16,7 @@ pub fn make_subcommand() -> Command {
 // Clean command implementation
 pub fn execute(args: &ArgMatches) -> mdbook::errors::Result<()> {
     let book_dir = get_book_dir(args);
-    let book = MDBook::load(&book_dir)?;
+    let book = MDBook::load(book_dir)?;
 
     let dir_to_remove = match args.get_one::<PathBuf>("dest-dir") {
         Some(dest_dir) => dest_dir.into(),

src/cmd/init.rs

@@ -86,7 +86,7 @@ pub fn execute(args: &ArgMatches) -> Result<()> {
 /// Obtains author name from git config file by running the `git config` command.
 fn get_author_name() -> Option<String> {
     let output = Command::new("git")
-        .args(&["config", "--get", "user.name"])
+        .args(["config", "--get", "user.name"])
         .output()
         .ok()?;
 

src/cmd/serve.rs

@@ -48,7 +48,7 @@ pub fn make_subcommand() -> Command {
 // Serve command implementation
 pub fn execute(args: &ArgMatches) -> Result<()> {
     let book_dir = get_book_dir(args);
-    let mut book = MDBook::load(&book_dir)?;
+    let mut book = MDBook::load(book_dir)?;
 
     let port = args.get_one::<String>("port").unwrap();
     let hostname = args.get_one::<String>("hostname").unwrap();
@@ -102,7 +102,7 @@ pub fn execute(args: &ArgMatches) -> Result<()> {
         info!("Building book...");
 
         // FIXME: This area is really ugly because we need to re-set livereload :(
-        let result = MDBook::load(&book_dir).and_then(|mut b| {
+        let result = MDBook::load(book_dir).and_then(|mut b| {
             update_config(&mut b);
             b.build()
         });

src/cmd/test.rs

@@ -44,7 +44,7 @@ pub fn execute(args: &ArgMatches) -> Result<()> {
     let chapter: Option<&str> = args.get_one::<String>("chapter").map(|s| s.as_str());
 
     let book_dir = get_book_dir(args);
-    let mut book = MDBook::load(&book_dir)?;
+    let mut book = MDBook::load(book_dir)?;
 
     if let Some(dest_dir) = args.get_one::<PathBuf>("dest-dir") {
         book.config.build.build_dir = dest_dir.to_path_buf();

src/cmd/watch.rs

@@ -21,7 +21,7 @@ pub fn make_subcommand() -> Command {
 // Watch command implementation
 pub fn execute(args: &ArgMatches) -> Result<()> {
     let book_dir = get_book_dir(args);
-    let mut book = MDBook::load(&book_dir)?;
+    let mut book = MDBook::load(book_dir)?;
 
     let update_config = |book: &mut MDBook| {
         if let Some(dest_dir) = args.get_one::<PathBuf>("dest-dir") {
@@ -42,7 +42,7 @@ pub fn execute(args: &ArgMatches) -> Result<()> {
 
     trigger_on_change(&book, |paths, book_dir| {
         info!("Files changed: {:?}\nBuilding book...\n", paths);
-        let result = MDBook::load(&book_dir).and_then(|mut b| {
+        let result = MDBook::load(book_dir).and_then(|mut b| {
             update_config(&mut b);
             b.build()
         });

src/preprocess/links.rs

@@ -93,7 +93,7 @@ where
     for link in find_links(s) {
         replaced.push_str(&s[previous_end_index..link.start_index]);
 
-        match link.render_with_path(&path, chapter_title) {
+        match link.render_with_path(path, chapter_title) {
             Ok(new_content) => {
                 if depth < MAX_LINK_NESTED_DEPTH {
                     if let Some(rel_path) = link.link_type.relative_path(path) {
@@ -327,7 +327,7 @@ impl<'a> Link<'a> {
         let base = base.as_ref();
         match self.link_type {
             // omit the escape char
-            LinkType::Escaped => Ok((&self.link_text[1..]).to_owned()),
+            LinkType::Escaped => Ok(self.link_text[1..].to_owned()),
             LinkType::Include(ref pat, ref range_or_anchor) => {
                 let target = base.join(pat);
 

src/renderer/html_handlebars/hbs_renderer.rs

@@ -99,7 +99,7 @@ impl HtmlHandlebars {
         ctx.data.insert("title".to_owned(), json!(title));
         ctx.data.insert(
             "path_to_root".to_owned(),
-            json!(utils::fs::path_to_root(&path)),
+            json!(utils::fs::path_to_root(path)),
         );
         if let Some(ref section) = ch.number {
             ctx.data
@@ -292,7 +292,7 @@ impl HtmlHandlebars {
         }
         if let Some(fonts_css) = &theme.fonts_css {
             if !fonts_css.is_empty() {
-                write_file(destination, "fonts/fonts.css", &fonts_css)?;
+                write_file(destination, "fonts/fonts.css", fonts_css)?;
             }
         }
         if !html_config.copy_fonts && theme.fonts_css.is_none() {
@@ -547,7 +547,7 @@ impl Renderer for HtmlHandlebars {
         // Print version
         let mut print_content = String::new();
 
-        fs::create_dir_all(&destination)
+        fs::create_dir_all(destination)
             .with_context(|| "Unexpected error when constructing destination path")?;
 
         let mut is_index = true;

src/renderer/html_handlebars/helpers/navigation.rs

@@ -127,7 +127,7 @@ fn render(
 
     context.insert(
         "path_to_root".to_owned(),
-        json!(utils::fs::path_to_root(&base_path)),
+        json!(utils::fs::path_to_root(base_path)),
     );
 
     chapter

src/renderer/markdown_renderer.rs

@@ -37,14 +37,14 @@ impl Renderer for MarkdownRenderer {
                 if !ch.is_draft_chapter() {
                     utils::fs::write_file(
                         &ctx.destination,
-                        &ch.path.as_ref().expect("Checked path exists before"),
+                        ch.path.as_ref().expect("Checked path exists before"),
                         ch.content.as_bytes(),
                     )?;
                 }
             }
         }
 
-        fs::create_dir_all(&destination)
+        fs::create_dir_all(destination)
             .with_context(|| "Unexpected error when constructing destination path")?;
 
         Ok(())

src/utils/fs.rs

@@ -210,39 +210,36 @@ mod tests {
         };
 
         // Create a couple of files
-        if let Err(err) = fs::File::create(&tmp.path().join("file.txt")) {
+        if let Err(err) = fs::File::create(tmp.path().join("file.txt")) {
             panic!("Could not create file.txt: {}", err);
         }
-        if let Err(err) = fs::File::create(&tmp.path().join("file.md")) {
+        if let Err(err) = fs::File::create(tmp.path().join("file.md")) {
             panic!("Could not create file.md: {}", err);
         }
-        if let Err(err) = fs::File::create(&tmp.path().join("file.png")) {
+        if let Err(err) = fs::File::create(tmp.path().join("file.png")) {
             panic!("Could not create file.png: {}", err);
         }
-        if let Err(err) = fs::create_dir(&tmp.path().join("sub_dir")) {
+        if let Err(err) = fs::create_dir(tmp.path().join("sub_dir")) {
             panic!("Could not create sub_dir: {}", err);
         }
-        if let Err(err) = fs::File::create(&tmp.path().join("sub_dir/file.png")) {
+        if let Err(err) = fs::File::create(tmp.path().join("sub_dir/file.png")) {
             panic!("Could not create sub_dir/file.png: {}", err);
         }
-        if let Err(err) = fs::create_dir(&tmp.path().join("sub_dir_exists")) {
+        if let Err(err) = fs::create_dir(tmp.path().join("sub_dir_exists")) {
             panic!("Could not create sub_dir_exists: {}", err);
         }
-        if let Err(err) = fs::File::create(&tmp.path().join("sub_dir_exists/file.txt")) {
+        if let Err(err) = fs::File::create(tmp.path().join("sub_dir_exists/file.txt")) {
             panic!("Could not create sub_dir_exists/file.txt: {}", err);
         }
-        if let Err(err) = symlink(
+        if let Err(err) = symlink(tmp.path().join("file.png"), tmp.path().join("symlink.png")) {
-            &tmp.path().join("file.png"),
-            &tmp.path().join("symlink.png"),
-        ) {
             panic!("Could not symlink file.png: {}", err);
         }
 
         // Create output dir
-        if let Err(err) = fs::create_dir(&tmp.path().join("output")) {
+        if let Err(err) = fs::create_dir(tmp.path().join("output")) {
             panic!("Could not create output: {}", err);
         }
-        if let Err(err) = fs::create_dir(&tmp.path().join("output/sub_dir_exists")) {
+        if let Err(err) = fs::create_dir(tmp.path().join("output/sub_dir_exists")) {
             panic!("Could not create output/sub_dir_exists: {}", err);
         }
 
@@ -253,22 +250,22 @@ mod tests {
         }
 
         // Check if the correct files where created
-        if !(&tmp.path().join("output/file.txt")).exists() {
+        if !tmp.path().join("output/file.txt").exists() {
             panic!("output/file.txt should exist")
         }
-        if (&tmp.path().join("output/file.md")).exists() {
+        if tmp.path().join("output/file.md").exists() {
             panic!("output/file.md should not exist")
         }
-        if !(&tmp.path().join("output/file.png")).exists() {
+        if !tmp.path().join("output/file.png").exists() {
             panic!("output/file.png should exist")
         }
-        if !(&tmp.path().join("output/sub_dir/file.png")).exists() {
+        if !tmp.path().join("output/sub_dir/file.png").exists() {
             panic!("output/sub_dir/file.png should exist")
         }
-        if !(&tmp.path().join("output/sub_dir_exists/file.txt")).exists() {
+        if !tmp.path().join("output/sub_dir_exists/file.txt").exists() {
             panic!("output/sub_dir/file.png should exist")
         }
-        if !(&tmp.path().join("output/symlink.png")).exists() {
+        if !tmp.path().join("output/symlink.png").exists() {
             panic!("output/symlink.png should exist")
         }
     }

tests/alternative_backends.rs

@@ -90,7 +90,7 @@ fn relative_command_path() {
             .set("output.html", toml::value::Table::new())
             .unwrap();
         config.set("output.myrenderer.command", cmd_path).unwrap();
-        let md = MDBook::init(&temp.path())
+        let md = MDBook::init(temp.path())
             .with_config(config)
             .build()
             .unwrap();

tests/dummy_book/mod.rs

@@ -112,12 +112,12 @@ fn recursive_copy<A: AsRef<Path>, B: AsRef<Path>>(from: A, to: B) -> Result<()>
     let from = from.as_ref();
     let to = to.as_ref();
 
-    for entry in WalkDir::new(&from) {
+    for entry in WalkDir::new(from) {
         let entry = entry.with_context(|| "Unable to inspect directory entry")?;
 
         let original_location = entry.path();
         let relative = original_location
-            .strip_prefix(&from)
+            .strip_prefix(from)
             .expect("`original_location` is inside the `from` directory");
         let new_location = to.join(relative);
 
@@ -126,7 +126,7 @@ fn recursive_copy<A: AsRef<Path>, B: AsRef<Path>>(from: A, to: B) -> Result<()>
                 fs::create_dir_all(parent).with_context(|| "Couldn't create directory")?;
             }
 
-            fs::copy(&original_location, &new_location)
+            fs::copy(original_location, &new_location)
                 .with_context(|| "Unable to copy file contents")?;
         }
     }

tests/rendered_output.rs

@@ -275,7 +275,7 @@ fn root_index_html() -> Result<Document> {
         .with_context(|| "Book building failed")?;
 
     let index_page = temp.path().join("book").join("index.html");
-    let html = fs::read_to_string(&index_page).with_context(|| "Unable to read index.html")?;
+    let html = fs::read_to_string(index_page).with_context(|| "Unable to read index.html")?;
 
     Ok(Document::from(html.as_str()))
 }
@@ -412,7 +412,7 @@ fn recursive_includes_are_capped() {
     let content = &["Around the world, around the world
 Around the world, around the world
 Around the world, around the world"];
-    assert_contains_strings(&recursive, content);
+    assert_contains_strings(recursive, content);
 }
 
 #[test]
@@ -462,7 +462,7 @@ fn by_default_mdbook_use_index_preprocessor_to_convert_readme_to_index() {
 
     let second_index = temp.path().join("book").join("second").join("index.html");
     let unexpected_strings = vec!["Second README"];
-    assert_doesnt_contain_strings(&second_index, &unexpected_strings);
+    assert_doesnt_contain_strings(second_index, &unexpected_strings);
 }
 
 #[test]
@@ -803,7 +803,7 @@ mod search {
             let src = read_book_index(temp.path());
 
             let dest = Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/searchindex_fixture.json");
-            let dest = File::create(&dest).unwrap();
+            let dest = File::create(dest).unwrap();
             serde_json::to_writer_pretty(dest, &src).unwrap();
 
             src