Mark a few functions as `const`

helix-core/src/line_ending.rs

@@ -20,7 +20,7 @@ pub enum LineEnding {
 
 impl LineEnding {
     #[inline]
-    pub fn len_chars(&self) -> usize {
+    pub const fn len_chars(&self) -> usize {
         match self {
             Self::Crlf => 2,
             _ => 1,
@@ -28,7 +28,7 @@ impl LineEnding {
     }
 
     #[inline]
-    pub fn as_str(&self) -> &'static str {
+    pub const fn as_str(&self) -> &'static str {
         match self {
             Self::Crlf => "\u{000D}\u{000A}",
             Self::LF => "\u{000A}",
@@ -42,7 +42,7 @@ impl LineEnding {
     }
 
     #[inline]
-    pub fn from_char(ch: char) -> Option<LineEnding> {
+    pub const fn from_char(ch: char) -> Option<LineEnding> {
         match ch {
             '\u{000A}' => Some(LineEnding::LF),
             '\u{000B}' => Some(LineEnding::VT),

helix-core/src/register.rs

@@ -7,7 +7,7 @@ pub struct Register {
 }
 
 impl Register {
-    pub fn new(name: char) -> Self {
+    pub const fn new(name: char) -> Self {
         Self {
             name,
             values: Vec::new(),
@@ -18,7 +18,7 @@ impl Register {
         Self { name, values }
     }
 
-    pub fn name(&self) -> char {
+    pub const fn name(&self) -> char {
         self.name
     }
 

helix-term/src/ui/editor.rs

@@ -1106,7 +1106,7 @@ fn canonicalize_key(key: &mut KeyEvent) {
 }
 
 #[inline]
-fn abs_diff(a: usize, b: usize) -> usize {
+const fn abs_diff(a: usize, b: usize) -> usize {
     if a > b {
         a - b
     } else {