Apply clippy lints (#551)

MSRV >= 1.62

src/core_editor/clip_buffer.rs

@@ -16,20 +16,15 @@ pub trait Clipboard: Send {
 }
 
 /// Determines how the content in the clipboard should be inserted
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, Debug, Default)]
 pub enum ClipboardMode {
     /// As direct content at the current cursor position
+    #[default]
     Normal,
     /// As new lines below or above
     Lines,
 }
 
-impl Default for ClipboardMode {
-    fn default() -> Self {
-        ClipboardMode::Normal
-    }
-}
-
 /// Simple buffer that provides a clipboard only usable within the application/library.
 #[derive(Default)]
 pub struct LocalClipboard {

src/history/cursor.rs

@@ -109,7 +109,7 @@ mod tests {
         #[cfg(any(feature = "sqlite", feature = "sqlite-dynlib"))]
         let hist = Box::new(SqliteBackedHistory::in_memory().unwrap());
         #[cfg(not(any(feature = "sqlite", feature = "sqlite-dynlib")))]
-        let hist = Box::new(FileBackedHistory::default());
+        let hist = Box::<FileBackedHistory>::default();
         (
             hist,
             HistoryCursor::new(HistoryNavigationQuery::Normal(LineBuffer::default())),

src/prompt/base.rs

@@ -59,21 +59,16 @@ pub enum PromptEditMode {
 }
 
 /// The vi-specific modes that the prompt can be in
-#[derive(Serialize, Deserialize, Clone, Debug, EnumIter)]
+#[derive(Serialize, Deserialize, Clone, Debug, EnumIter, Default)]
 pub enum PromptViMode {
     /// The default mode
+    #[default]
     Normal,
 
     /// Insertion mode
     Insert,
 }
 
-impl Default for PromptViMode {
-    fn default() -> Self {
-        PromptViMode::Normal
-    }
-}
-
 impl Display for PromptEditMode {
     fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
         match self {