reorganize into modules

src/app/mod.rs

@@ -0,0 +1,58 @@
+use std::{cmp::min, env, fs::File, io::Read, process::exit};
+use crossterm::event::{self, Event, KeyCode, KeyModifiers};
+
+use crate::BYTES_PER_LINE;
+
+mod widget;
+
+#[derive(Debug)]
+pub struct App {
+	pub contents: Vec<u8>,
+	pub scroll_position: usize,
+	// pub cursor_position: usize,
+	pub should_quit: bool
+}
+
+impl App {
+	pub fn init() -> Self {
+		let input_files: Vec<_> = env::args().skip(1).collect();
+		
+		if input_files.is_empty() {
+			println!("please provide at least one file as input");
+			exit(1);
+		}
+		
+		assert!(input_files.len() == 1);
+		
+		let file_name = input_files.first().unwrap();
+		
+		let file = File::open(file_name);
+		let mut contents = Vec::new();
+		file.unwrap().read_to_end(&mut contents).unwrap();
+		
+		Self {
+			contents,
+			scroll_position: 0,
+			// cursor_position: 0,
+			should_quit: false,
+		}
+	}
+	
+	pub fn handle_events(&mut self) {
+		match event::read().unwrap() {
+			Event::Key(key_event) if key_event.code == KeyCode::Char('q') => {
+				self.should_quit = true;
+			}
+			Event::Key(key_event) if key_event.code == KeyCode::Char('e') &&
+			                         key_event.modifiers.contains(KeyModifiers::CONTROL) => {
+				let max_scroll_position = self.contents.len() - 0x50;
+				self.scroll_position = min(self.scroll_position + BYTES_PER_LINE, max_scroll_position);
+			}
+			Event::Key(key_event) if key_event.code == KeyCode::Char('y') &&
+			                         key_event.modifiers.contains(KeyModifiers::CONTROL) => {
+				self.scroll_position = self.scroll_position.saturating_sub(BYTES_PER_LINE);
+			}
+			_ => {}
+		}
+	}
+}