Advanced buffering, read and display file

src/main.rs

@@ -4,6 +4,7 @@ use crossterm::{
 };
 use std::panic;
 use std::io::{stdout, Result, Write, Stdout};
+use std::fs::read_to_string;
 
 
 #[derive(Default)]
@@ -11,7 +12,7 @@ struct Nuudel {
 	quitting: bool,
 	cursorx: u16,
 	cursory: u16,
-	buffer: String,
+	buffer: Buffer,
 }
 
 #[derive(Default)]
@@ -30,6 +31,7 @@ fn main() -> Result<()> {
 	// Basic stuff
 	let mut nuudel = Nuudel::default();
 	Nuudel::init_terminal()?;
+	nuudel.open_file("Cargo.toml")?;
 	nuudel.run(&mut stdout())?;
 	Nuudel::restore_terminal()?;
 
@@ -105,24 +107,17 @@ impl Nuudel {
 		stdout.execute(cursor::MoveTo(0, 0))?;
 
 		let mut y = 0;
-		self.buffer = "\n".to_string();
-		let buffer_lines = self.buffer.lines().count() as u16;
-
-		while y < terminal::size()?.1 - buffer_lines {
-			self.buffer.push_str("~\n");
-			y += 1;
-		}
 
 		// Draw buffer one by one
-		y = 0;
-		let mut lines = self.buffer.lines();
+		let mut lines = self.buffer.lines.iter();
 		while y < terminal::size()?.1-1 {
 			stdout.execute(terminal::Clear(terminal::ClearType::CurrentLine))?;
 			if let Some(line) = lines.next() {
 				write!(stdout, "{}", line)?;
 			} else {
-				break;
-			}	stdout.execute(cursor::MoveToNextLine(1))?;
+				write!(stdout, "~")?;
+			}
+			stdout.execute(cursor::MoveToNextLine(1))?;
 			y += 1;
 		}
 		print!("Press Q to quit");
@@ -133,4 +128,14 @@ impl Nuudel {
 
 		Ok(())
 	}
+
+	fn open_file(&mut self, filename: &str) -> Result<()> {
+		self.buffer.lines.clear();
+		self.buffer.lines = read_to_string(filename)
+			.unwrap()
+			.lines()
+			.map(String::from)
+			.collect();
+			Ok(())
+	}
 }