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10
Cargo.toml Normal file
View File

@@ -0,0 +1,10 @@
[package]
name = "sudoku-tui"
version = "0.1.0"
edition = "2024"
[dependencies]
anyhow = "1.0.100"
crossterm = "0.29.0"
rand = "0.9.2"
ratatui = "0.29.0"

431
src/main.rs Normal file
View File

@@ -0,0 +1,431 @@
use anyhow::Result;
use crossterm::{
event::{self, Event, KeyCode, KeyEventKind},
execute,
terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
};
use ratatui::{
prelude::*,
widgets::*,
};
use std::io;
use rand::prelude::*;
static EMPTY_CELLS: u8 = 16;
#[derive(PartialEq)]
enum GameState {
Playing,
Won,
Lost,
}
struct App {
grid: [[u8; 9]; 9],
pointer: (usize, usize),
fails: u8,
state: GameState,
}
impl App {
fn new() -> Self {
let mut app = App {
grid: [[0; 9]; 9],
pointer: (4, 4),
fails: 0,
state: GameState::Playing,
};
let mut rng = rand::rng();
app.fill_diagonal_box(&mut rng);
app.fill_remaining(0, 0);
app.remove_k_digits(&mut rng);
app
}
fn remove_k_digits(&mut self, rng: &mut ThreadRng) {
let mut k = EMPTY_CELLS;
while k > 0 {
let cellid = rng.random_range(0..=80);
let i = cellid / 9;
let j = cellid % 9;
if self.grid[i][j] != 0 {
self.grid[i][j] = 0;
k -= 1;
}
}
}
fn unused_in_box(&self, row_start: usize, col_start: usize, num: u8) -> bool {
for i in 0..3 {
for j in 0..3 {
if self.grid[row_start+i][col_start+j] == num {
return false;
}
}
}
true
}
fn fill_box(&mut self, row: usize, col: usize, rng: &mut impl Rng) {
for i in 0..3 {
for j in 0..3 {
let mut n: u8;
loop {
n = rng.random_range(1..=9);
if self.unused_in_box(row, col, n) { break };
}
self.grid[row+i][col+j] = n;
}
}
}
fn fill_diagonal_box(&mut self, rng: &mut ThreadRng) {
for i in (0..9).step_by(3) {
self.fill_box(i, i, rng);
}
}
fn unused_in_row(&self, i: usize, num: u8) -> bool {
!self.grid[i].contains(&num)
}
fn unused_in_col(&self, j: usize, num: u8) -> bool {
for i in 0..9 {
if self.grid[i][j] == num {
return false;
}
}
true
}
fn check_if_safe(&self, i: usize, j: usize, num: u8) -> bool {
self.unused_in_row(i, num) && self.unused_in_col(j, num) && self.unused_in_box(i - i % 3, j - j % 3, num)
}
fn fill_remaining(&mut self, i: usize, j: usize) -> bool {
if i == 9 {
return true;
}
if j == 9 {
return self.fill_remaining(i+1, 0);
}
if self.grid[i][j] != 0 {
return self.fill_remaining(i, j+1);
}
for num in 1..10 {
if self.check_if_safe(i, j, num) {
self.grid[i][j] = num;
if self.fill_remaining(i, j+1) {
return true;
}
self.grid[i][j] = 0;
}
}
false
}
fn validate(&self) -> bool {
for row in 0..9 {
for col in 0..9 {
if self.grid[row][col] == 0 {
return false;
}
}
}
for row in 0..9 {
let mut seen = [false; 10];
for col in 0..9 {
let val = self.grid[row][col];
if seen[val as usize] {
return false;
}
seen[val as usize] = true;
}
}
for col in 0..9 {
let mut seen = [false; 10];
for row in 0..9 {
let val = self.grid[row][col];
if seen[val as usize] {
return false;
}
seen[val as usize] = true;
}
}
for i in (0..9).step_by(3) {
for j in (0..9).step_by(3) {
let mut seen = [false; 10];
for row in 0..3 {
for col in 0..3 {
let val = self.grid[i + row][j + col];
if seen[val as usize] {
return false;
}
seen[val as usize] = true;
}
}
}
}
true
}
fn move_pointer(&mut self, direction: &str) {
match direction {
"up" if self.pointer.0 > 0 => self.pointer.0 -= 1,
"down" if self.pointer.0 < 8 => self.pointer.0 += 1,
"left" if self.pointer.1 > 0 => self.pointer.1 -= 1,
"right" if self.pointer.1 < 8 => self.pointer.1 += 1,
_ => {}
}
}
fn insert_number(&mut self, num: u8) {
if self.state != GameState::Playing {
return;
}
if self.check_if_safe(self.pointer.0, self.pointer.1, num) {
self.grid[self.pointer.0][self.pointer.1] = num;
} else {
self.fails += 1;
}
if self.fails >= 3 {
self.state = GameState::Lost;
} else if self.validate() {
self.state = GameState::Won;
}
}
}
fn graceful_exit(condition: &str) {
let _ = crossterm::terminal::disable_raw_mode();
let _ = crossterm::execute!(
std::io::stdout(),
crossterm::terminal::LeaveAlternateScreen,
crossterm::cursor::Show
);
println!("{}", condition);
std::process::exit(0);
}
fn ui(f: &mut Frame, app: &App) {
let main_layout = Layout::default()
.direction(Direction::Vertical)
.constraints([
Constraint::Length(1),
Constraint::Min(0),
])
.split(f.area());
let header_chunks = Layout::default()
.direction(Direction::Horizontal)
.constraints([
Constraint::Fill(1),
Constraint::Length(15),
])
.split(main_layout[0]);
f.render_widget(Block::default().borders(Borders::ALL).title(" Sudoku "), header_chunks[0]);
let fails_color = match app.fails {
0 => Color::Green,
1 => Color::Yellow,
_ => Color::Red,
};
f.render_widget(
Paragraph::new(format!("Fails: {}/3", app.fails))
.block(Block::default().borders(Borders::ALL))
.style(Style::default().fg(fails_color))
.alignment(Alignment::Right),
header_chunks[1]
);
let grid_area = center_rect(69, 33, main_layout[1]);
render_grid(f, app, grid_area);
if app.state != GameState::Playing {
render_popup(f, app);
}
}
fn render_popup(f: &mut Frame, app: &App) {
let area = center_rect(40, 7, f.area());
f.render_widget(Clear, area);
let (title, color, text) = match app.state {
GameState::Won => (" VICTORY ", Color::Green, "You solved the puzzle!\n\nPress 'q' to quit"),
GameState::Lost => (" GAME OVER ", Color::Red, "Too many mistakes.\n\nPress 'q' to quit"),
_ => ("", Color::White, ""),
};
let block = Block::default()
.title(title)
.borders(Borders::ALL)
.border_style(Style::default().fg(color));
let paragraph = Paragraph::new(text)
.block(block)
.alignment(Alignment::Center);
f.render_widget(paragraph, area);
}
fn center_rect(width: u16, height: u16, area: Rect) -> Rect {
let popup_layout = Layout::default()
.direction(Direction::Vertical)
.constraints([
Constraint::Fill(1),
Constraint::Length(height),
Constraint::Fill(1),
])
.split(area);
Layout::default()
.direction(Direction::Horizontal)
.constraints([
Constraint::Fill(1),
Constraint::Length(width),
Constraint::Fill(1),
])
.split(popup_layout[1])[1]
}
fn render_grid(f: &mut Frame, app: &App, area: Rect) {
let major_rows = Layout::default()
.direction(Direction::Vertical)
.constraints(vec![Constraint::Length(11); 3])
.split(area);
for r_major in 0..3 {
let major_cols = Layout::default()
.direction(Direction::Horizontal)
.constraints(vec![Constraint::Length(23); 3])
.split(major_rows[r_major]);
for c_major in 0..3 {
let big_block = Block::default()
.borders(Borders::ALL)
.border_style(Style::default().fg(Color::White));
f.render_widget(big_block.clone(), major_cols[c_major]);
let inner_area = big_block.inner(major_cols[c_major]);
let minor_rows = Layout::default()
.direction(Direction::Vertical)
.constraints(vec![Constraint::Length(3); 3])
.split(inner_area);
for r_minor in 0..3 {
let minor_cols = Layout::default()
.direction(Direction::Horizontal)
.constraints(vec![Constraint::Length(7); 3])
.split(minor_rows[r_minor]);
for c_minor in 0..3 {
let row = r_major * 3 + r_minor;
let col = c_major * 3 + c_minor;
let value = app.grid[row][col];
let num_str = if value == 0 { ".".to_string() } else { value.to_string() };
let is_selected = app.pointer == (row, col);
let text_style = if is_selected {
Style::default().fg(Color::White).bg(Color::Blue)
} else {
Style::default().fg(Color::DarkGray)
};
f.render_widget(
Paragraph::new(num_str)
.block(Block::default().borders(Borders::ALL).border_style(Style::default().fg(Color::DarkGray)))
.style(text_style)
.alignment(Alignment::Center),
minor_cols[c_minor]
);
}
}
}
}
}
fn run_app(terminal: &mut Terminal<CrosstermBackend<io::Stdout>>, app: &mut App) -> io::Result<()> {
loop {
terminal.draw(|f| ui(f, app))?;
if let Event::Key(key) = event::read()? {
if key.kind == KeyEventKind::Press {
if let KeyCode::Char('q') = key.code {
return Ok(());
}
if app.state == GameState::Playing {
match key.code {
KeyCode::Up => app.move_pointer("up"),
KeyCode::Down => app.move_pointer("down"),
KeyCode::Left => app.move_pointer("left"),
KeyCode::Right => app.move_pointer("right"),
// Numbers 0-9
KeyCode::Char(c) if c.is_digit(10) => {
app.insert_number(c.to_digit(10).unwrap() as u8);
}
_ => {}
}
}
}
}
}
}
fn main() -> Result<()> {
enable_raw_mode();
let mut stdout = io::stdout();
execute!(stdout, EnterAlternateScreen);
let backend = CrosstermBackend::new(stdout);
let mut terminal = Terminal::new(backend)?;
let mut app = App::new();
let res = run_app(&mut terminal, &mut app);
disable_raw_mode();
execute!(terminal.backend_mut(), LeaveAlternateScreen);
terminal.show_cursor();
if let Err(err) = res {
println!("{:?}", err)
}
Ok(())
}