Add rust lint CI job.

rust/sys/teton/src/framebuffer.rs

@@ -16,15 +16,16 @@ impl Framebuffer {
         })
     }
 
-    fn draw_pixel(&self, row: u32, col: u32, pixel: u32) {
+    fn draw_pixel(&mut self, row: u32, col: u32, pixel: u32) {
         let index = row * (self.fb_info.pitch as u32 / 4) + col;
         self.memory_region.mut_slice()[index as usize] = pixel;
     }
 
-    pub fn draw_glyph(&self, glyph: &[u8], row: u32, col: u32) {
+    pub fn draw_glyph(&mut self, glyph: &[u8], row: u32, col: u32) {
         let gl_width = 8;
         let gl_height = 16;
 
+        #[allow(clippy::needless_range_loop)]
         for r in 0..gl_height {
             for c in 0..gl_width {
                 if ((glyph[r] >> c) % 2) == 1 {

rust/sys/teton/src/psf.rs

@@ -23,7 +23,7 @@ pub struct Psf {
 
 impl Psf {
     pub fn new(path: &str) -> Result<Self, ZError> {
-        let file = File::open(&path)?;
+        let file = File::open(path)?;
 
         let header = file.slice()[0..core::mem::size_of::<PsfHeader>()]
             .as_ptr()

rust/sys/teton/src/terminal.rs

@@ -62,10 +62,8 @@ impl Terminal {
     }
 
     fn write_line(&mut self, line: &str) {
-        let mut col = 0;
-        for c in line.chars() {
-            self.console.write_char(c, self.row, col);
-            col += 1;
+        for (col, c) in line.chars().enumerate() {
+            self.console.write_char(c, self.row, col as u32);
         }
 
         self.row += 1