clippy: appease clippy as of Rust 1.68.0 (#1055)

* clippy: fix derivable_impls clippy warning

This was done using `cargo clippy --fix`

* cargo fmt after autofix

src/app.rs

@@ -33,18 +33,13 @@ pub mod states;
 
 use frozen_state::FrozenState;
 
-#[derive(Debug, Clone, Eq, PartialEq)]
+#[derive(Debug, Clone, Eq, PartialEq, Default)]
 pub enum AxisScaling {
+    #[default]
     Log,
     Linear,
 }
 
-impl Default for AxisScaling {
-    fn default() -> Self {
-        AxisScaling::Log
-    }
-}
-
 /// AppConfigFields is meant to cover basic fields that would normally be set
 /// by config files or launch options.
 #[derive(Debug, Default, Eq, PartialEq)]

src/app/data_harvester/temperature.rs

@@ -24,19 +24,14 @@ pub struct TempHarvest {
     pub temperature: f32,
 }
 
-#[derive(Clone, Debug, Copy, PartialEq, Eq)]
+#[derive(Clone, Debug, Copy, PartialEq, Eq, Default)]
 pub enum TemperatureType {
+    #[default]
     Celsius,
     Kelvin,
     Fahrenheit,
 }
 
-impl Default for TemperatureType {
-    fn default() -> Self {
-        TemperatureType::Celsius
-    }
-}
-
 fn convert_celsius_to_kelvin(celsius: f32) -> f32 {
     celsius + 273.15
 }

src/app/layout_manager.rs

@@ -882,8 +882,9 @@ pub struct BottomWidget {
     pub bottom_right_corner: Option<(u16, u16)>,
 }
 
-#[derive(Debug, Clone, Eq, PartialEq, Hash)]
+#[derive(Debug, Clone, Eq, PartialEq, Hash, Default)]
 pub enum BottomWidgetType {
+    #[default]
     Empty,
     Cpu,
     CpuLegend,
@@ -927,12 +928,6 @@ impl BottomWidgetType {
     }
 }
 
-impl Default for BottomWidgetType {
-    fn default() -> Self {
-        BottomWidgetType::Empty
-    }
-}
-
 impl std::str::FromStr for BottomWidgetType {
     type Err = BottomError;
 

src/components/data_table/state.rs

@@ -1,20 +1,15 @@
 use tui::{layout::Rect, widgets::TableState};
 
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Default)]
 pub enum ScrollDirection {
     // UP means scrolling up --- this usually DECREMENTS
     Up,
 
     // DOWN means scrolling down --- this usually INCREMENTS
+    #[default]
     Down,
 }
 
-impl Default for ScrollDirection {
-    fn default() -> Self {
-        ScrollDirection::Down
-    }
-}
-
 /// Internal state representation of a [`DataTable`](super::DataTable).
 pub struct DataTableState {
     /// The index from where to start displaying the rows.

src/data_conversion.rs

@@ -13,19 +13,14 @@ use crate::units::data_units::DataUnit;
 use crate::utils::gen_util::*;
 use crate::widgets::{DiskWidgetData, TempWidgetData};
 
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub enum BatteryDuration {
     ToEmpty(i64),
     ToFull(i64),
+    #[default]
     Unknown,
 }
 
-impl Default for BatteryDuration {
-    fn default() -> Self {
-        BatteryDuration::Unknown
-    }
-}
-
 #[derive(Default, Debug)]
 pub struct ConvertedBatteryData {
     pub battery_name: String,

src/units/data_units.rs

@@ -1,11 +1,6 @@
-#[derive(Debug, Clone, Eq, PartialEq)]
+#[derive(Debug, Clone, Eq, PartialEq, Default)]
 pub enum DataUnit {
     Byte,
+    #[default]
     Bit,
 }
-
-impl Default for DataUnit {
-    fn default() -> Self {
-        DataUnit::Bit
-    }
-}