replacing

src/edit_action.rs

@@ -4,7 +4,12 @@ use crate::{app::App, cursor::Cursor};
 pub enum EditAction {
 	Delete {
 		cursor: Cursor,
-		data: Vec<u8>
+		old_data: Vec<u8>
+	},
+	Replace {
+		cursor: Cursor,
+		old_data: Vec<u8>,
+		new_byte: u8
 	}
 }
 
@@ -17,6 +22,9 @@ impl App {
 	fn execute_edit(&mut self, edit_action: &EditAction) {
 		match edit_action {
 			EditAction::Delete { cursor, .. } => self.delete_at(*cursor),
+			EditAction::Replace {
+				cursor, old_data: _, new_byte
+			} => self.replace_at_with(*cursor, *new_byte),
 		}
 	}
 	
@@ -26,4 +34,10 @@ impl App {
 		self.cursor.head = min(cursor.head, cursor.tail);
 		self.cursor.collapse();
 	}
+	
+	fn replace_at_with(&mut self, cursor: Cursor, new_byte: u8) {
+		self.contents[self.cursor.range()].fill(new_byte);
+		
+		self.cursor = cursor;
+	}
 }