[refactor] replace manual insertions with collects

- This helps remove unnecessary mut's
- Using static slice prevents the need to create Vec which is discarded anyway

swhkd/src/daemon.rs

@@ -441,7 +441,7 @@ fn socket_write(command: &str, socket_path: PathBuf) -> Result<(), Box<dyn Error
 pub fn check_input_group() -> Result<(), Box<dyn Error>> {
     if !Uid::current().is_root() {
         let groups = nix::unistd::getgroups();
-        for (_, groups) in groups.iter().enumerate() {
+        for groups in groups.iter() {
             for group in groups {
                 let group = Group::from_gid(*group);
                 if group.unwrap().unwrap().name == "input" {

swhkd/src/uinput.rs

@@ -10,15 +10,10 @@ use std::os::unix::io::AsRawFd;
 ioctl_none!(rfkill_noinput, b'R', 1);
 
 pub fn create_uinput_device() -> Result<VirtualDevice, Box<dyn std::error::Error>> {
-    let mut keys = AttributeSet::<Key>::new();
-    for key in get_all_keys() {
-        keys.insert(key);
-    }
+    let keys: AttributeSet<Key> = get_all_keys().iter().copied().collect();
 
-    let mut relative_axes = AttributeSet::<RelativeAxisType>::new();
-    for axis in get_all_relative_axes() {
-        relative_axes.insert(axis);
-    }
+    let relative_axes: AttributeSet<RelativeAxisType> =
+        get_all_relative_axes().iter().copied().collect();
 
     let device = VirtualDeviceBuilder::new()?
         .name("swhkd virtual output")
@@ -30,10 +25,7 @@ pub fn create_uinput_device() -> Result<VirtualDevice, Box<dyn std::error::Error
 }
 
 pub fn create_uinput_switches_device() -> Result<VirtualDevice, Box<dyn std::error::Error>> {
-    let mut switches = AttributeSet::<SwitchType>::new();
-    for switch in get_all_switches() {
-        switches.insert(switch);
-    }
+    let switches: AttributeSet<SwitchType> = get_all_switches().iter().copied().collect();
 
     // We have to disable rfkill-input to avoid blocking all radio devices. When
     // a new device (virtual or physical) with the SW_RFKILL_ALL capability bit
@@ -56,8 +48,8 @@ pub fn create_uinput_switches_device() -> Result<VirtualDevice, Box<dyn std::err
         .unwrap();
     Ok(device)
 }
-pub fn get_all_keys() -> Vec<Key> {
-    vec![
+pub fn get_all_keys() -> &'static [Key] {
+    &[
         evdev::Key::KEY_RESERVED,
         evdev::Key::KEY_ESC,
         evdev::Key::KEY_1,
@@ -609,8 +601,8 @@ pub fn get_all_keys() -> Vec<Key> {
     ]
 }
 
-pub fn get_all_relative_axes() -> Vec<RelativeAxisType> {
-    vec![
+pub fn get_all_relative_axes() -> &'static [RelativeAxisType] {
+    &[
         RelativeAxisType::REL_X,
         RelativeAxisType::REL_Y,
         RelativeAxisType::REL_Z,
@@ -627,8 +619,8 @@ pub fn get_all_relative_axes() -> Vec<RelativeAxisType> {
     ]
 }
 
-pub fn get_all_switches() -> Vec<SwitchType> {
-    vec![
+pub fn get_all_switches() -> &'static [SwitchType] {
+    &[
         SwitchType::SW_LID,
         SwitchType::SW_TABLET_MODE,
         SwitchType::SW_HEADPHONE_INSERT,