qcalc 0.15.3

qcalc is a simple but effective terminal calculator for quick access and ease of use. It supports history of expressions, built-in functions and stored variables
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53

use std::{error::Error, io, panic};

use crossterm::{
    event::{DisableMouseCapture, EnableMouseCapture},
    terminal::{self, EnterAlternateScreen, LeaveAlternateScreen},
};

pub type CrosstermTerminal = ratatui::Terminal<ratatui::backend::CrosstermBackend<std::io::Stdout>>;

use crate::{app::App, event::EventHandler, ui};

pub struct Tui {
    terminal: CrosstermTerminal,
    pub events: EventHandler,
}

impl Tui {
    pub fn new(terminal: CrosstermTerminal, events: EventHandler) -> Self {
        Self { terminal, events }
    }

    pub fn enter(&mut self) -> Result<(), Box<dyn Error>> {
        terminal::enable_raw_mode()?;
        crossterm::execute!(io::stderr(), EnterAlternateScreen, EnableMouseCapture)?;

        let panic_hook = panic::take_hook();
        panic::set_hook(Box::new(move |panic| {
            Self::reset().expect("failed to reset the terminal");
            panic_hook(panic);
        }));

        self.terminal.hide_cursor()?;
        self.terminal.clear()?;
        Ok(())
    }

    pub fn draw(&mut self, app: &mut App) -> Result<(), Box<dyn Error>> {
        self.terminal.draw(|frame| ui::render(app, frame))?;
        Ok(())
    }

    fn reset() -> Result<(), Box<dyn Error>> {
        terminal::disable_raw_mode()?;
        crossterm::execute!(io::stderr(), LeaveAlternateScreen, DisableMouseCapture)?;
        Ok(())
    }

    pub fn exit(&mut self) -> Result<(), Box<dyn Error>> {
        Self::reset()?;
        self.terminal.show_cursor()?;
        Ok(())
    }
}