diff --git a/clippy.toml b/clippy.toml
new file mode 100644
index 0000000..2b47d11
--- /dev/null
+++ b/clippy.toml
@@ -0,0 +1 @@
+type-complexity-threshold = 500
\ No newline at end of file
diff --git a/musicus/src/editors/performance.rs b/musicus/src/editors/performance.rs
index 05a7c8a..5ff60ab 100644
--- a/musicus/src/editors/performance.rs
+++ b/musicus/src/editors/performance.rs
@@ -97,7 +97,7 @@ impl Screen<Option<Performance>, Performance> for PerformanceEditor {
             spawn!(@clone this, async move {
                 if let Some(person) = push!(this.handle, PersonSelector).await {
                     this.show_person(Some(&person));
-                    this.person.replace(Some(person.clone()));
+                    this.person.replace(Some(person));
                     this.show_ensemble(None);
                     this.ensemble.replace(None);
                 }
diff --git a/musicus/src/editors/recording.rs b/musicus/src/editors/recording.rs
index 0604b35..8c4d881 100644
--- a/musicus/src/editors/recording.rs
+++ b/musicus/src/editors/recording.rs
@@ -203,7 +203,7 @@ impl RecordingEditor {
         self.handle
             .backend
             .db()
-            .update_recording(recording.clone().into())
+            .update_recording(recording.clone())
             .await
             .unwrap();
 
diff --git a/musicus/src/editors/work.rs b/musicus/src/editors/work.rs
index cea397e..d5a51dd 100644
--- a/musicus/src/editors/work.rs
+++ b/musicus/src/editors/work.rs
@@ -11,7 +11,6 @@ use gtk_macros::get_widget;
 use libadwaita::prelude::*;
 use musicus_backend::db::{generate_id, Instrument, Person, Work, WorkPart, WorkSection};
 use std::cell::RefCell;
-use std::convert::TryInto;
 use std::rc::Rc;
 
 /// Either a work part or a work section.
@@ -86,10 +85,7 @@ impl Screen<Option<Work>, Work> for WorkEditor {
                 }
 
                 for section in work.sections {
-                    structure.insert(
-                        section.before_index.try_into().unwrap(),
-                        PartOrSection::Section(section),
-                    );
+                    structure.insert(section.before_index, PartOrSection::Section(section));
                 }
 
                 (work.id, Some(work.composer), work.instruments, structure)
@@ -141,7 +137,7 @@ impl Screen<Option<Work>, Work> for WorkEditor {
             spawn!(@clone this, async move {
                 if let Some(person) = push!(this.handle, PersonSelector).await {
                     this.show_composer(&person);
-                    this.composer.replace(Some(person.to_owned()));
+                    this.composer.replace(Some(person));
                 }
             });
         }));
@@ -179,7 +175,7 @@ impl Screen<Option<Work>, Work> for WorkEditor {
                 if let Some(instrument) = push!(this.handle, InstrumentSelector).await {
                     let length = {
                         let mut instruments = this.instruments.borrow_mut();
-                        instruments.push(instrument.clone());
+                        instruments.push(instrument);
                         instruments.len()
                     };
 
@@ -344,8 +340,8 @@ impl WorkEditor {
                 .clone()
                 .expect("Tried to create work without composer!"),
             instruments: self.instruments.borrow().clone(),
-            parts: parts,
-            sections: sections,
+            parts,
+            sections,
         };
 
         let upload = self.upload_switch.state();
@@ -356,7 +352,7 @@ impl WorkEditor {
         self.handle
             .backend
             .db()
-            .update_work(work.clone().into())
+            .update_work(work.clone())
             .await
             .unwrap();
 
diff --git a/musicus/src/import/medium_editor.rs b/musicus/src/import/medium_editor.rs
index 163386f..2199a99 100644
--- a/musicus/src/import/medium_editor.rs
+++ b/musicus/src/import/medium_editor.rs
@@ -211,7 +211,7 @@ impl MediumEditor {
             id: generate_id(),
             name: self.name_entry.text().to_string(),
             discid: Some(self.session.source_id().to_owned()),
-            tracks: tracks,
+            tracks,
         };
 
         let upload = self.publish_switch.state();
diff --git a/musicus/src/import/medium_preview.rs b/musicus/src/import/medium_preview.rs
index 211038d..0954bad 100644
--- a/musicus/src/import/medium_preview.rs
+++ b/musicus/src/import/medium_preview.rs
@@ -210,7 +210,7 @@ impl MediumPreview {
     /// Copy the tracks to the music library and add the medium to the database.
     async fn import(&self) -> Result<()> {
         let medium = self.medium.borrow();
-        let medium = medium.as_ref().ok_or(anyhow!("No medium set!"))?;
+        let medium = medium.as_ref().ok_or_else(|| anyhow!("No medium set!"))?;
 
         // Create a new directory in the music library path for the imported medium.
 
diff --git a/musicus/src/import/source_selector.rs b/musicus/src/import/source_selector.rs
index 6b3c97a..f9c473e 100644
--- a/musicus/src/import/source_selector.rs
+++ b/musicus/src/import/source_selector.rs
@@ -6,7 +6,6 @@ use glib::clone;
 use gtk::prelude::*;
 use gtk_macros::get_widget;
 use musicus_backend::import::ImportSession;
-use std::path::PathBuf;
 use std::rc::Rc;
 
 /// A dialog for starting to import music.
@@ -63,7 +62,7 @@ impl Screen<(), ()> for SourceSelector {
                             this.widget.set_visible_child_name("loading");
 
                             spawn!(@clone this, async move {
-                                match ImportSession::folder(PathBuf::from(path)).await {
+                                match ImportSession::folder(path).await {
                                     Ok(session) => {
                                         let result = push!(this.handle, ImportScreen, session).await;
                                         this.handle.pop(result);
diff --git a/musicus/src/import/track_editor.rs b/musicus/src/import/track_editor.rs
index 0f0887b..b6a595a 100644
--- a/musicus/src/import/track_editor.rs
+++ b/musicus/src/import/track_editor.rs
@@ -61,10 +61,8 @@ impl Screen<(Recording, Vec<usize>), Vec<usize>> for TrackEditor {
                 let mut selection = this.selection.borrow_mut();
                 if check.is_active() {
                     selection.push(index);
-                } else {
-                    if let Some(pos) = selection.iter().position(|part| *part == index) {
-                        selection.remove(pos);
-                    }
+                } else if let Some(pos) = selection.iter().position(|part| *part == index) {
+                    selection.remove(pos);
                 }
             }));
 
diff --git a/musicus/src/import/track_selector.rs b/musicus/src/import/track_selector.rs
index 63bd623..e32481e 100644
--- a/musicus/src/import/track_selector.rs
+++ b/musicus/src/import/track_selector.rs
@@ -65,10 +65,8 @@ impl Screen<Arc<ImportSession>, Vec<usize>> for TrackSelector {
                 let mut selection = this.selection.borrow_mut();
                 if check.is_active() {
                     selection.push(index);
-                } else {
-                    if let Some(pos) = selection.iter().position(|part| *part == index) {
-                        selection.remove(pos);
-                    }
+                } else if let Some(pos) = selection.iter().position(|part| *part == index) {
+                    selection.remove(pos);
                 }
 
                 if selection.is_empty() {
diff --git a/musicus/src/preferences/register.rs b/musicus/src/preferences/register.rs
index 0a81e01..0c4b69b 100644
--- a/musicus/src/preferences/register.rs
+++ b/musicus/src/preferences/register.rs
@@ -70,7 +70,7 @@ impl Screen<(), LoginData> for RegisterDialog {
                     let captcha_id = this.captcha_id.borrow().clone().unwrap();
                     let answer = this.captcha_entry.text().to_string();
 
-                    let email = if email.len() == 0 {
+                    let email = if email.is_empty() {
                         None
                     } else {
                         Some(email)
diff --git a/musicus/src/preferences/server.rs b/musicus/src/preferences/server.rs
index 58fd386..c422a0d 100644
--- a/musicus/src/preferences/server.rs
+++ b/musicus/src/preferences/server.rs
@@ -10,7 +10,7 @@ pub struct ServerDialog {
     backend: Rc<Backend>,
     window: libadwaita::Window,
     url_entry: gtk::Entry,
-    selected_cb: RefCell<Option<Box<dyn Fn(String) -> ()>>>,
+    selected_cb: RefCell<Option<Box<dyn Fn(String)>>>,
 }
 
 impl ServerDialog {
@@ -54,7 +54,7 @@ impl ServerDialog {
     }
 
     /// The closure to call when the server was set.
-    pub fn set_selected_cb<F: Fn(String) -> () + 'static>(&self, cb: F) {
+    pub fn set_selected_cb<F: Fn(String) + 'static>(&self, cb: F) {
         self.selected_cb.replace(Some(Box::new(cb)));
     }
 
diff --git a/musicus/src/selectors/ensemble.rs b/musicus/src/selectors/ensemble.rs
index e644c77..e063673 100644
--- a/musicus/src/selectors/ensemble.rs
+++ b/musicus/src/selectors/ensemble.rs
@@ -41,13 +41,13 @@ impl Screen<(), Ensemble> for EnsembleSelector {
 
         this.selector
             .set_load_online(clone!(@weak this =>  @default-panic, move || {
-                let clone = this.clone();
+                let clone = this;
                 async move { Ok(clone.handle.backend.cl().get_ensembles().await?) }
             }));
 
         this.selector
             .set_load_local(clone!(@weak this =>  @default-panic, move || {
-                let clone = this.clone();
+                let clone = this;
                 async move { clone.handle.backend.db().get_ensembles().await.unwrap() }
             }));
 
diff --git a/musicus/src/selectors/instrument.rs b/musicus/src/selectors/instrument.rs
index 996a89d..cfea819 100644
--- a/musicus/src/selectors/instrument.rs
+++ b/musicus/src/selectors/instrument.rs
@@ -41,13 +41,13 @@ impl Screen<(), Instrument> for InstrumentSelector {
 
         this.selector
             .set_load_online(clone!(@weak this =>  @default-panic, move || {
-                let clone = this.clone();
+                let clone = this;
                 async move { Ok(clone.handle.backend.cl().get_instruments().await?) }
             }));
 
         this.selector
             .set_load_local(clone!(@weak this =>  @default-panic, move || {
-                let clone = this.clone();
+                let clone = this;
                 async move { clone.handle.backend.db().get_instruments().await.unwrap() }
             }));
 
diff --git a/musicus/src/selectors/person.rs b/musicus/src/selectors/person.rs
index 184e17f..2a04ab4 100644
--- a/musicus/src/selectors/person.rs
+++ b/musicus/src/selectors/person.rs
@@ -41,13 +41,13 @@ impl Screen<(), Person> for PersonSelector {
 
         this.selector
             .set_load_online(clone!(@weak this =>  @default-panic, move || {
-                let clone = this.clone();
+                let clone = this;
                 async move { Ok(clone.handle.backend.cl().get_persons().await?) }
             }));
 
         this.selector
             .set_load_local(clone!(@weak this =>  @default-panic, move || {
-                let clone = this.clone();
+                let clone = this;
                 async move { clone.handle.backend.db().get_persons().await.unwrap() }
             }));
 
diff --git a/musicus/src/selectors/selector.rs b/musicus/src/selectors/selector.rs
index 9d3c078..07cb268 100644
--- a/musicus/src/selectors/selector.rs
+++ b/musicus/src/selectors/selector.rs
@@ -20,8 +20,8 @@ pub struct Selector<T: 'static> {
     stack: gtk::Stack,
     list: Rc<List>,
     items: RefCell<Vec<T>>,
-    back_cb: RefCell<Option<Box<dyn Fn() -> ()>>>,
-    add_cb: RefCell<Option<Box<dyn Fn() -> ()>>>,
+    back_cb: RefCell<Option<Box<dyn Fn()>>>,
+    add_cb: RefCell<Option<Box<dyn Fn()>>>,
     make_widget: RefCell<Option<Box<dyn Fn(&T) -> gtk::Widget>>>,
     load_online: RefCell<Option<Box<dyn Fn() -> Box<dyn Future<Output = Result<Vec<T>>>>>>>,
     load_local: RefCell<Option<Box<dyn Fn() -> Box<dyn Future<Output = Vec<T>>>>>>,
@@ -147,12 +147,12 @@ impl<T> Selector<T> {
     }
 
     /// Set the closure to be called when the user wants to go back.
-    pub fn set_back_cb<F: Fn() -> () + 'static>(&self, cb: F) {
+    pub fn set_back_cb<F: Fn() + 'static>(&self, cb: F) {
         self.back_cb.replace(Some(Box::new(cb)));
     }
 
     /// Set the closure to be called when the user wants to add an item.
-    pub fn set_add_cb<F: Fn() -> () + 'static>(&self, cb: F) {
+    pub fn set_add_cb<F: Fn() + 'static>(&self, cb: F) {
         self.add_cb.replace(Some(Box::new(cb)));
     }
 
diff --git a/musicus/src/widgets/indexed_list_model.rs b/musicus/src/widgets/indexed_list_model.rs
index cf952a5..fe576b7 100644
--- a/musicus/src/widgets/indexed_list_model.rs
+++ b/musicus/src/widgets/indexed_list_model.rs
@@ -5,16 +5,11 @@ use std::cell::Cell;
 
 glib::wrapper! {
     /// A thin list model managing only indices to an external data source.
-    pub struct IndexedListModel(ObjectSubclass<indexed_list_model::IndexedListModel>)
+    pub struct IndexedListModel(ObjectSubclass<indexed_list_model_imp::IndexedListModel>)
         @implements gio::ListModel;
 }
 
 impl IndexedListModel {
-    /// Create a new indexed list model, which will be empty initially.
-    pub fn new() -> Self {
-        glib::Object::new(&[]).unwrap()
-    }
-
     /// Set the length of the list model.
     pub fn set_length(&self, length: u32) {
         let old_length = self.property("length").unwrap().get::<u32>().unwrap();
@@ -23,7 +18,13 @@ impl IndexedListModel {
     }
 }
 
-mod indexed_list_model {
+impl Default for IndexedListModel {
+    fn default() -> Self {
+        glib::Object::new(&[]).unwrap()
+    }
+}
+
+mod indexed_list_model_imp {
     use super::*;
 
     #[derive(Debug, Default)]
@@ -97,7 +98,7 @@ mod indexed_list_model {
 
 glib::wrapper! {
     /// A simple GObject holding just one integer.
-    pub struct ItemIndex(ObjectSubclass<item_index::ItemIndex>);
+    pub struct ItemIndex(ObjectSubclass<item_index_imp::ItemIndex>);
 }
 
 impl ItemIndex {
@@ -112,7 +113,7 @@ impl ItemIndex {
     }
 }
 
-mod item_index {
+mod item_index_imp {
     use super::*;
 
     #[derive(Debug, Default)]
diff --git a/musicus/src/widgets/list.rs b/musicus/src/widgets/list.rs
index 7550894..841cec0 100644
--- a/musicus/src/widgets/list.rs
+++ b/musicus/src/widgets/list.rs
@@ -18,7 +18,7 @@ pub struct List {
 impl List {
     /// Create a new list. The list will be empty initially.
     pub fn new() -> Rc<Self> {
-        let model = IndexedListModel::new();
+        let model = IndexedListModel::default();
         let filter = gtk::CustomFilter::new(|_| true);
         let filter_model = gtk::FilterListModel::new(Some(&model), Some(&filter));
 
diff --git a/musicus/src/widgets/player_bar.rs b/musicus/src/widgets/player_bar.rs
index 93077fa..e25b4fe 100644
--- a/musicus/src/widgets/player_bar.rs
+++ b/musicus/src/widgets/player_bar.rs
@@ -17,7 +17,7 @@ pub struct PlayerBar {
     play_image: gtk::Image,
     pause_image: gtk::Image,
     player: Rc<RefCell<Option<Rc<Player>>>>,
-    playlist_cb: Rc<RefCell<Option<Box<dyn Fn() -> ()>>>>,
+    playlist_cb: Rc<RefCell<Option<Box<dyn Fn()>>>>,
 }
 
 impl PlayerBar {
@@ -37,7 +37,7 @@ impl PlayerBar {
         get_widget!(builder, gtk::Image, pause_image);
 
         let player = Rc::new(RefCell::new(None::<Rc<Player>>));
-        let playlist_cb = Rc::new(RefCell::new(None::<Box<dyn Fn() -> ()>>));
+        let playlist_cb = Rc::new(RefCell::new(None::<Box<dyn Fn()>>));
 
         previous_button.connect_clicked(clone!(@strong player => move |_| {
             if let Some(player) = &*player.borrow() {
@@ -74,8 +74,8 @@ impl PlayerBar {
             duration_label,
             play_image,
             pause_image,
-            player: player,
-            playlist_cb: playlist_cb,
+            player,
+            playlist_cb,
         }
     }
 
@@ -164,7 +164,7 @@ impl PlayerBar {
         }
     }
 
-    pub fn set_playlist_cb<F: Fn() -> () + 'static>(&self, cb: F) {
+    pub fn set_playlist_cb<F: Fn() + 'static>(&self, cb: F) {
         self.playlist_cb.replace(Some(Box::new(cb)));
     }
 }
diff --git a/musicus/src/widgets/upload_section.rs b/musicus/src/widgets/upload_section.rs
index 2dc60b6..bfd563a 100644
--- a/musicus/src/widgets/upload_section.rs
+++ b/musicus/src/widgets/upload_section.rs
@@ -40,7 +40,7 @@ impl UploadSection {
         let section = Section::new(&gettext("Upload"), &list);
 
         let this = Rc::new(Self {
-            widget: section.widget.clone(),
+            widget: section.widget,
             backend,
             switch,
         });