Highlight single-line comments

src/filetype.rs

@@ -8,6 +8,7 @@ pub struct HighlightingOptions {
     numbers: bool,
     strings: bool,
     characters: bool,
+    comments: bool,
 }
 
 impl Default for FileType {
@@ -36,6 +37,7 @@ impl FileType {
                     numbers: true,
                     strings: true,
                     characters: true,
+                    comments: true,
                 },
             };
         }
@@ -56,4 +58,8 @@ impl HighlightingOptions {
     pub fn characters(self) -> bool {
         self.characters
     }
+
+    pub fn comments(self) -> bool {
+        self.comments
+    }
 }

src/highlighting.rs

@@ -7,6 +7,7 @@ pub enum Type {
     Match,
     String,
     Character,
+    Comment,
 }
 
 impl Type {
@@ -16,6 +17,7 @@ impl Type {
             Type::Match => color::Rgb(38, 139, 210),
             Type::String => color::Rgb(211, 54, 130),
             Type::Character => color::Rgb(108, 113, 196),
+            Type::Comment => color::Rgb(133, 153, 0),
             _ => color::Rgb(255, 255, 255),
         }
     }

src/row.rs

@@ -289,6 +289,18 @@ impl Row {
                 }
             }
 
+            if opts.comments() && *c == '/' {
+                if let Some(next_char) = chars.get(index.saturating_add(1)) {
+                    if *next_char == '/' {
+                        for _ in index..chars.len() {
+                            highlighting.push(highlighting::Type::Comment);
+                        }
+
+                        break;
+                    }
+                };
+            }
+
             if opts.numbers() {
                 if (c.is_ascii_digit()
                     && (prev_is_separator || *previous_highlight == highlighting::Type::Number))