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use crate::registers::RegistersData;
use crossterm::{
event::{self, Event, KeyCode},
terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
ExecutableCommand,
};
use nix::unistd::Pid;
use ratatui::{prelude::*, widgets::*};
use std::io::{self, stdout};
struct UI {
height: usize,
max_lines: usize,
scroll: usize,
}
impl UI {
fn new() -> UI {
UI {
height: 0,
max_lines: 0,
scroll: 0,
}
}
}
fn handle_events(ui: &mut UI) -> io::Result<bool> {
if event::poll(std::time::Duration::from_millis(50))? {
if let Event::Key(key) = event::read()? {
if key.kind == event::KeyEventKind::Press {
match key.code {
KeyCode::Char('q') => {
return Ok(true);
}
KeyCode::Char('j') | KeyCode::Down => {
if ui.scroll < (ui.max_lines - ui.height + 1) {
ui.scroll += 1;
}
}
KeyCode::Char('J') | KeyCode::Char('G') => {
ui.scroll = ui.max_lines - ui.height + 1;
}
KeyCode::Char('k') | KeyCode::Up => {
if ui.scroll > 1 {
ui.scroll -= 1;
}
}
KeyCode::Char('K') | KeyCode::Char('0') => {
ui.scroll = ui.height;
}
_ => {}
}
}
}
}
Ok(false)
}
pub fn run_tui(pid: Pid, registers: &Vec<RegistersData>) -> anyhow::Result<()> {
enable_raw_mode()?;
stdout().execute(EnterAlternateScreen)?;
let mut terminal = Terminal::new(CrosstermBackend::new(stdout()))?;
let mut ui = UI::new();
ui.max_lines = registers.len() + 1;
let mut should_quit = false;
while !should_quit {
ui.height = terminal.get_frame().size().height as usize;
terminal.draw(move |frame| {
let size = frame.size();
let lines: Vec<Line> = registers.iter().map(|x| x.output_ui()).collect();
frame.render_widget(
Paragraph::new(lines)
.block(
Block::default()
.border_style(Style::default().fg(Color::Yellow))
.title(format!("[{pid}]"))
.title(
block::Title::from(format!(
"[lines {}-{}]",
ui.scroll,
ui.scroll + ui.height
))
.position(block::Position::Bottom)
.alignment(Alignment::Right),
)
.borders(Borders::ALL),
)
.scroll((ui.scroll as u16, 0)),
size,
);
})?;
should_quit = handle_events(&mut ui)?;
}
disable_raw_mode()?;
stdout().execute(LeaveAlternateScreen)?;
Ok(())
}
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