Apply a bunch of clippy suggestions

src/backend/drm/backend.rs

@@ -114,7 +114,7 @@ impl DrmBackend {
                         |surface| {
                             // create an egl surface from the gbm one
                             debug!(log, "Creating EGLSurface");
-                            let egl_surface = context.egl.create_surface(&surface)?;
+                            let egl_surface = context.egl.create_surface(surface)?;
 
                             // make it active for the first `crtc::set`
                             // (which is needed before the first page_flip)
@@ -270,7 +270,7 @@ impl DrmBackend {
     /// Other errors might occur.
     pub fn use_mode(&mut self, mode: Mode) -> Result<()> {
         // check the connectors
-        for connector in self.connectors.iter() {
+        for connector in &self.connectors {
             if !connector::Info::load_from_device(self.graphics.head().head().head(), *connector)
                 .chain_err(|| {
                     ErrorKind::DrmDev(format!("{:?}", self.graphics.head().head().head()))
@@ -318,7 +318,7 @@ impl DrmBackend {
                 |surface| {
                     // create an egl surface from the gbm one
                     debug!(logger_ref, "Creating EGLSurface");
-                    let egl_surface = graphics.context.egl.create_surface(&surface)?;
+                    let egl_surface = graphics.context.egl.create_surface(surface)?;
 
                     // make it active for the first `crtc::set`
                     // (which is needed before the first page_flip)
@@ -383,13 +383,12 @@ impl Drop for DrmBackend {
         self.graphics.rent_all_mut(|graphics| {
             if let Some(fb) = graphics.gbm.surface.rent(|egl| {
                 if let Some(mut next) = egl.buffers.next_buffer.take() {
-                    return next.take_userdata();
+                    next.take_userdata()
+                } else if let Ok(mut next) = graphics.gbm.surface.head().lock_front_buffer() {
+                    next.take_userdata()
                 } else {
-                    if let Ok(mut next) = graphics.gbm.surface.head().lock_front_buffer() {
-                        return next.take_userdata();
-                    }
-                }
                     None
+                }
             }) {
                 // ignore failure at this point
                 let _ = framebuffer::destroy(&*graphics.context.devices.drm, fb.handle());

src/backend/drm/mod.rs

@@ -397,7 +397,7 @@ impl<B: From<DrmBackend> + Borrow<DrmBackend> + 'static> DrmDevice<B> {
         let connectors = connectors.into();
 
         // check if we have an encoder for every connector and the mode mode
-        for connector in connectors.iter() {
+        for connector in &connectors {
             let con_info = connector::Info::load_from_device(self.context.head().head(), *connector)
                 .chain_err(|| {
                     ErrorKind::DrmDev(format!("{:?}", self.context.head().head()))
@@ -471,7 +471,7 @@ pub trait DrmHandler<B: Borrow<DrmBackend> + 'static> {
     fn error(&mut self, evlh: &mut EventLoopHandle, device: &mut DrmDevice<B>, error: DrmError);
 }
 
-/// Bind a `DrmDevice` to an EventLoop,
+/// Bind a `DrmDevice` to an `EventLoop`,
 ///
 /// This will cause it to recieve events and feed them into an `DrmHandler`
 pub fn drm_device_bind<B, H>(evlh: &mut EventLoopHandle, device: DrmDevice<B>, handler: H)
@@ -500,8 +500,7 @@ where
             let events = crtc::receive_events(dev);
             match events {
                 Ok(events) => for event in events {
-                    match event {
+                    if let crtc::Event::PageFlip(event) = event {
-                        crtc::Event::PageFlip(event) => {
                         let token = dev.backends.get(&event.crtc).cloned();
                         if let Some(token) = token {
                             // we can now unlock the buffer
@@ -511,10 +510,8 @@ where
                             handler.ready(evlh, dev, &token, event.frame, event.duration);
                         }
                     }
-                        _ => {}
-                    }
                 },
-                Err(err) => return handler.error(evlh, dev, err),
+                Err(err) => handler.error(evlh, dev, err),
             };
         },
         error: |evlh, id, _, error| {

src/backend/graphics/egl.rs

@@ -640,7 +640,7 @@ impl<'a, T: NativeSurface> EGLContext<'a, T> {
 
         let mut context_attributes = Vec::with_capacity(10);
 
-        if egl_version >= (1, 5) || extensions.iter().any(|s| s == &"EGL_KHR_create_context") {
+        if egl_version >= (1, 5) || extensions.iter().any(|s| *s == "EGL_KHR_create_context") {
             trace!(log, "Setting CONTEXT_MAJOR_VERSION to {}", version.0);
             context_attributes.push(ffi::egl::CONTEXT_MAJOR_VERSION as i32);
             context_attributes.push(version.0 as i32);
@@ -728,8 +728,8 @@ impl<'a, T: NativeSurface> EGLContext<'a, T> {
                 self.display,
                 self.config_id,
                 match surface {
-                    NativeSurfacePtr::X11(ptr) => ptr,
+                    NativeSurfacePtr::X11(ptr) |
-                    NativeSurfacePtr::Wayland(ptr) => ptr,
+                    NativeSurfacePtr::Wayland(ptr) |
                     NativeSurfacePtr::Gbm(ptr) => ptr,
                 },
                 self.surface_attributes.as_ptr(),
@@ -743,7 +743,7 @@ impl<'a, T: NativeSurface> EGLContext<'a, T> {
         debug!(self.logger, "EGL surface successfully created");
 
         Ok(EGLSurface {
-            context: &self,
+            context: self,
             surface: egl_surface,
             keep,
             _lifetime_surface: PhantomData,
@@ -894,9 +894,9 @@ impl fmt::Display for SwapBuffersError {
 
 impl error::Error for SwapBuffersError {
     fn description(&self) -> &str {
-        match self {
+        match *self {
-            &SwapBuffersError::ContextLost => "The context has been lost, it needs to be recreated",
+            SwapBuffersError::ContextLost => "The context has been lost, it needs to be recreated",
-            &SwapBuffersError::AlreadySwapped => {
+            SwapBuffersError::AlreadySwapped => {
                 "Buffers are already swapped, swap_buffers was called too many times"
             }
         }
@@ -987,7 +987,7 @@ pub struct PixelFormat {
     pub srgb: bool,
 }
 
-/// Trait that describes objects that have an OpenGl context
+/// Trait that describes objects that have an OpenGL context
 /// and can be used to render upon
 pub trait EGLGraphicsBackend: GraphicsBackend {
     /// Swaps buffers at the end of a frame.

src/backend/winit.rs

@@ -618,8 +618,8 @@ impl InputBackend for WinitInputBackend {
             let mut handler = self.handler.as_mut();
             let logger = &self.logger;
 
-            self.events_loop.poll_events(move |event| match event {
+            self.events_loop.poll_events(move |event| {
-                Event::WindowEvent { event, .. } => {
+                if let Event::WindowEvent { event, .. } = event {
                     match (event, handler.as_mut()) {
                         (WindowEvent::Resized(x, y), _) => {
                             trace!(logger, "Resizing window to {:?}", (x, y));
@@ -816,8 +816,6 @@ impl InputBackend for WinitInputBackend {
                     }
                     *time_counter += 1;
                 }
-                Event::DeviceEvent { .. } => {}
-                _ => {}
             });
         }
 

src/wayland/compositor/handlers.rs

@@ -79,7 +79,7 @@ impl<U, R, ID> Clone for SurfaceIData<U, R, ID> {
     fn clone(&self) -> SurfaceIData<U, R, ID> {
         SurfaceIData {
             log: self.log.clone(),
-            implem: self.implem.clone(),
+            implem: self.implem,
             idata: self.idata.clone(),
         }
     }

src/wayland/compositor/mod.rs

@@ -77,7 +77,7 @@
 //! the details of what it enables you.
 //!
 //! The surface metadata is held in the `SurfaceAttributes` struct. In contains double-buffered
-//! state pending from the client as defined by the protocol for wl_surface, as well as your
+//! state pending from the client as defined by the protocol for `wl_surface`, as well as your
 //! user-defined type holding any data you need to have associated with a struct. See its
 //! documentation for details.
 //!
@@ -240,7 +240,7 @@ impl Default for RegionAttributes {
 /// A Compositor global token
 ///
 /// This token can be cloned at will, and is the entry-point to
-/// access data associated with the wl_surface and wl_region managed
+/// access data associated with the `wl_surface` and `wl_region` managed
 /// by the `CompositorGlobal` that provided it.
 pub struct CompositorToken<U, R, ID> {
     _data: ::std::marker::PhantomData<*mut U>,
@@ -524,7 +524,7 @@ impl<U: 'static, R: RoleType + 'static, ID: 'static> CompositorToken<U, R, ID> {
     }
 }
 
-/// Create new wl_compositor and wl_subcompositor globals.
+/// Create new `wl_compositor` and `wl_subcompositor` globals.
 ///
 /// The globals are directly registered into the eventloop, and this function
 /// returns a `CompositorToken` which you'll need access the data associated to

src/wayland/compositor/roles.rs

@@ -102,9 +102,9 @@ pub trait RoleType {
     fn has_role(&self) -> bool;
 }
 
-/// A trait representing the capability of a RoleType to handle a given role
+/// A trait representing the capability of a `RoleType` to handle a given role
 ///
-/// This trait allows to interact with the different roles a RoleType can
+/// This trait allows to interact with the different roles a `RoleType` can
 /// handle.
 ///
 /// This trait is meant to be used generically, for example, to retrieve the

src/wayland/compositor/tree.rs

@@ -21,8 +21,8 @@ use wayland_server::protocol::wl_surface;
 /// have a failure case to forbid this. Note that if any node in such a graph does not
 /// have a parent, then the graph is a tree and this node is its root.
 ///
-/// All the methods here are unsafe, because they assume the provided wl_surface object
+/// All the methods here are unsafe, because they assume the provided `wl_surface` object
-/// is correctly initialized regarding its user_data.
+/// is correctly initialized regarding its `user_data`.
 pub struct SurfaceData<U, R> {
     parent: Option<wl_surface::WlSurface>,
     children: Vec<wl_surface::WlSurface>,
@@ -369,13 +369,12 @@ impl<U: 'static, R: 'static> SurfaceData<U, R> {
         let mut data_guard = data_mutex.lock().unwrap();
         let data_guard = &mut *data_guard;
         // call the callback on ourselves
-        match f(
+        if let TraversalAction::DoChildren(t) = f(
             root,
             &mut data_guard.attributes,
             &mut data_guard.role,
             &initial,
         ) {
-            TraversalAction::DoChildren(t) => {
             // loop over children
             if reverse {
                 for c in data_guard.children.iter().rev() {
@@ -391,7 +390,5 @@ impl<U: 'static, R: 'static> SurfaceData<U, R> {
                 }
             }
         }
-            _ => {}
-        }
     }
 }

src/wayland/output/mod.rs

@@ -267,7 +267,7 @@ impl Output {
 
     /// Chech is given wl_output instance is managed by this `Output`.
     pub fn owns(&self, output: &wl_output::WlOutput) -> bool {
-        self.instances.iter().find(|&o| o.equals(output)).is_some()
+        self.instances.iter().any(|o| o.equals(output))
     }
 
     /// Cleanup internal `wl_output` instances list

src/wayland/seat/keyboard.rs

@@ -170,7 +170,7 @@ pub enum Error {
 /// Create a keyboard handler from a set of RMLVO rules
 pub(crate) fn create_keyboard_handler(rules: &str, model: &str, layout: &str, variant: &str,
                                       options: Option<String>, repeat_delay: i32, repeat_rate: i32,
-                                      logger: ::slog::Logger)
+                                      logger: &::slog::Logger)
                                       -> Result<KeyboardHandle, Error> {
     let log = logger.new(o!("smithay_module" => "xkbcommon_handler"));
     info!(log, "Initializing a xkbcommon handler with keymap query";

src/wayland/seat/mod.rs

@@ -169,7 +169,7 @@ impl Seat {
             options,
             repeat_delay,
             repeat_rate,
-            self.log.clone(),
+            &self.log,
         )?;
         if self.keyboard.is_some() {
             // there is already a keyboard, remove it and notify the clients

src/wayland/seat/pointer.rs

@@ -64,7 +64,7 @@ impl PointerHandle {
         // do we leave a surface ?
         let mut leave = true;
         if let Some(ref focus) = guard.focus {
-            if let Some((ref surface, _, _)) = location {
+            if let Some((surface, _, _)) = location {
                 if focus.equals(surface) {
                     leave = false;
                 }

src/wayland/shell/mod.rs

@@ -251,7 +251,7 @@ impl PopupState {
         if let Some(p) = self.parent.clone() {
             Some(PopupState {
                 parent: p,
-                positioner: self.positioner.clone(),
+                positioner: self.positioner,
             })
         } else {
             // the parent surface does no exist any longer,
@@ -283,15 +283,15 @@ impl<U, R, CID, SID, SD> Clone for ShellSurfaceIData<U, R, CID, SID, SD> {
     fn clone(&self) -> ShellSurfaceIData<U, R, CID, SID, SD> {
         ShellSurfaceIData {
             log: self.log.clone(),
-            compositor_token: self.compositor_token.clone(),
+            compositor_token: self.compositor_token,
-            implementation: self.implementation.clone(),
+            implementation: self.implementation,
             idata: self.idata.clone(),
             state_token: self.state_token.clone(),
         }
     }
 }
 
-/// Create new xdg_shell and wl_shell globals.
+/// Create new `xdg_shell` and `wl_shell` globals.
 ///
 /// The globals are directly registered into the eventloop, and this function
 /// returns a `StateToken<_>` which you'll need access the list of shell

src/wayland/shell/wl_handlers.rs

@@ -72,7 +72,7 @@ where
                 pending_configures: Vec::new(),
                 configured: true,
             };
-            if let Err(_) = idata.compositor_token.give_role_with(surface, role_data) {
+            if idata.compositor_token.give_role_with(surface, role_data).is_err() {
                 shell.post_error(
                     wl_shell::Error::Role as u32,
                     "Surface already has a role.".into(),
@@ -91,7 +91,7 @@ where
             // register ourselves to the wl_shell for ping handling
             let mutex = unsafe { &*(shell.get_user_data() as *mut ShellUserData<SD>) };
             let mut guard = mutex.lock().unwrap();
-            if guard.1.len() == 0 && guard.0.pending_ping != 0 {
+            if guard.1.is_empty() && guard.0.pending_ping != 0 {
                 // there is a pending ping that no surface could receive yet, send it
                 // note this is not possible that it was received and then a wl_shell_surface was
                 // destroyed, because wl_shell_surface has no destructor!
@@ -241,7 +241,7 @@ where
                 min_size: (0, 0),
                 max_size: (0, 0),
             });
-            return true;
+            true
         })
         .expect("xdg_surface exists but surface has not shell_surface role?!");
     // we need to notify about this new toplevel surface
@@ -419,11 +419,10 @@ where
             let &(ref surface, _) = unsafe { &*(ptr as *mut ShellSurfaceUserData) };
             idata
                 .compositor_token
-                .with_role_data(surface, |data| match data.pending_state {
+                .with_role_data(surface, |data| {
-                    ShellSurfacePendingState::Toplevel(ref mut state) => {
+                    if let ShellSurfacePendingState::Toplevel(ref mut state) = data.pending_state {
                         state.title = title;
                     }
-                    _ => {}
                 })
                 .expect("wl_shell_surface exists but wl_surface has wrong role?!");
         },

src/wayland/shell/xdg_handlers.rs

@@ -93,7 +93,7 @@ where
                 pending_configures: Vec::new(),
                 configured: false,
             };
-            if let Err(_) = idata.compositor_token.give_role_with(wl_surface, role_data) {
+            if idata.compositor_token.give_role_with(wl_surface, role_data).is_err() {
                 shell.post_error(
                     zxdg_shell_v6::Error::Role as u32,
                     "Surface already has a role.".into(),
@@ -315,7 +315,7 @@ where
                 .with_role_data::<ShellSurfaceRole, _, _>(surface, |data| {
                     data.pending_state = ShellSurfacePendingState::Popup(PopupState {
                         parent: unsafe { parent_surface.clone_unchecked() },
-                        positioner: positioner_data.clone(),
+                        positioner: *positioner_data,
                     });
                 })
                 .expect("xdg_surface exists but surface has not shell_surface role?!");

src/wayland/shm/mod.rs

@@ -71,7 +71,7 @@ use wayland_server::protocol::{wl_buffer, wl_shm, wl_shm_pool};
 mod pool;
 
 #[derive(Clone)]
-/// Internal data storage of ShmGlobal
+/// Internal data storage of `ShmGlobal`
 ///
 /// This type is only visible as type parameter of
 /// the `Global` handle you are provided.
@@ -104,9 +104,7 @@ where
         log: log.new(o!("smithay_module" => "shm_handler")),
     };
 
-    let global = evl.register_global::<wl_shm::WlShm, _>(1, shm_global_bind, data);
+    evl.register_global::<wl_shm::WlShm, _>(1, shm_global_bind, data)
-
-    global
 }
 
 /// Error that can occur when accessing an SHM buffer
@@ -125,13 +123,13 @@ pub enum BufferAccessError {
 
 /// Call given closure with the contents of the given buffer
 ///
-/// If the buffer is managed by the provided ShmGlobal, its contents are
+/// If the buffer is managed by the provided `ShmGlobal`, its contents are
 /// extracted and the closure is extracted with them:
 ///
 /// - The first argument is a data slice of the contents of the pool
 /// - The second argument is the specification of this buffer is this pool
 ///
-/// If the buffer is not managed by the provided ShmGlobal, the closure is not called
+/// If the buffer is not managed by the provided `ShmGlobal`, the closure is not called
 /// and this method will return `Err(())` (this will be the case for an EGL buffer for example).
 pub fn with_buffer_contents<F>(buffer: &wl_buffer::WlBuffer, f: F) -> Result<(), BufferAccessError>
 where