Fix some clippy lints

src/buffer.rs

@@ -1,10 +1,7 @@
 // SPDX-License-Identifier: MIT OR Apache-2.0
 
 #[cfg(not(feature = "std"))]
-use alloc::{
-    string::{String, ToString},
-    vec::Vec,
-};
+use alloc::{string::String, vec::Vec};
 use core::{cmp, fmt};
 use unicode_segmentation::UnicodeSegmentation;
 
@@ -54,8 +51,9 @@ impl Cursor {
 }
 
 /// Whether to associate cursors placed at a boundary between runs with the run before or after it.
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd)]
+#[derive(Copy, Clone, Debug, Default, Eq, PartialEq, Ord, PartialOrd)]
 pub enum Affinity {
+    #[default]
     Before,
     After,
 }
@@ -86,12 +84,6 @@ impl Affinity {
     }
 }
 
-impl Default for Affinity {
-    fn default() -> Self {
-        Affinity::Before
-    }
-}
-
 /// The position of a cursor within a [`Buffer`].
 #[derive(Debug)]
 pub struct LayoutCursor {

src/edit/editor.rs

@@ -613,8 +613,7 @@ impl Edit for Editor {
                         let line = &self.buffer.lines[self.cursor.line];
                         self.cursor.index = line.text()[..self.cursor.index]
                             .char_indices()
-                            .rev()
-                            .next()
+                            .next_back()
                             .map_or(0, |(i, _)| i);
                     } else if self.cursor.line > 0 {
                         // Move cursor to previous line
@@ -719,15 +718,10 @@ impl Edit for Editor {
                     }
 
                     // Adjust selection
-                    match self.select_opt {
-                        Some(ref mut select) => {
-                            if select.line == line_i {
-                                if select.index >= after_whitespace {
-                                    select.index += required_indent;
-                                }
-                            }
+                    if let Some(ref mut select) = self.select_opt {
+                        if select.line == line_i && select.index >= after_whitespace {
+                            select.index += required_indent;
                         }
-                        None => {}
                     }
 
                     // Request redraw
@@ -786,22 +780,15 @@ impl Edit for Editor {
                     );
 
                     // Adjust cursor
-                    if self.cursor.line == line_i {
-                        if self.cursor.index > last_indent {
-                            self.cursor.index -= after_whitespace - last_indent;
-                        }
+                    if self.cursor.line == line_i && self.cursor.index > last_indent {
+                        self.cursor.index -= after_whitespace - last_indent;
                     }
 
                     // Adjust selection
-                    match self.select_opt {
-                        Some(ref mut select) => {
-                            if select.line == line_i {
-                                if select.index > last_indent {
-                                    select.index -= after_whitespace - last_indent;
-                                }
-                            }
+                    if let Some(ref mut select) = self.select_opt {
+                        if select.line == line_i && select.index > last_indent {
+                            select.index -= after_whitespace - last_indent;
                         }
-                        None => {}
                     }
 
                     // Request redraw

src/edit/mod.rs

@@ -167,7 +167,7 @@ pub trait Edit {
     /// Get the current tab width
     fn tab_width(&self) -> usize;
 
-    /// Set the current tab width. A tab_width of 0 is not allowed, and will be ignored
+    /// Set the current tab width. A `tab_width` of 0 is not allowed, and will be ignored
     fn set_tab_width(&mut self, tab_width: usize);
 
     /// Shape lines until scroll, after adjusting scroll if the cursor moved

src/lib.rs

@@ -61,10 +61,10 @@
 #![allow(clippy::new_without_default)]
 // TODO: address occurrences and then deny
 //
+// Overflows can produce unpredictable results and are only checked in debug builds
+#![allow(clippy::arithmetic_side_effects)]
 // Indexing a slice can cause panics and that is something we always want to avoid
 #![allow(clippy::indexing_slicing)]
-// Overflows can produce unpredictable results and are only checked in debug builds
-#![allow(clippy::integer_arithmetic)]
 // Soundness issues
 //
 // Dereferencing unaligned pointers may be undefined behavior

src/shape.rs

@@ -1251,12 +1251,10 @@ impl ShapeLine {
             layout_lines.push(LayoutLine {
                 w: if align != Align::Justified {
                     visual_line.w
+                } else if self.rtl {
+                    start_x - x
                 } else {
-                    if self.rtl {
-                        start_x - x
-                    } else {
-                        x
-                    }
+                    x
                 },
                 max_ascent: max_ascent * font_size,
                 max_descent: max_descent * font_size,