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|
mod trace;
use crossterm::{
event::{self, Event, KeyCode},
terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
ExecutableCommand,
};
use ratatui::{prelude::*, widgets::*};
use std::{
io::{self, stdout},
str,
};
use crate::trace::{exec, trace};
use clap::Parser;
use fork::{fork, Fork};
use nix::unistd::Pid;
#[derive(Parser)]
#[command(author, version, about, long_about = None)]
struct Args {
/// Command to execute from ptrace
command: String,
/// Write the output to a file instead of the standard output
#[arg(short = 'f', long = "file")]
file_to_print: Option<String>,
}
struct UI {
height: usize,
max_lines: usize,
scroll: usize,
}
impl UI {
fn new() -> UI {
UI {
height: 0,
max_lines: 0,
scroll: 0,
}
}
}
/// Create a fork of the program and execute the process in the child. Parent gets the pid
/// value and trace it.
fn main() -> anyhow::Result<()> {
enable_raw_mode()?;
stdout().execute(EnterAlternateScreen)?;
let mut terminal = Terminal::new(CrosstermBackend::new(stdout()))?;
let mut ui = UI::new();
let args = Args::parse();
let pid = match fork() {
Ok(Fork::Child) => return exec(&args.command),
Ok(Fork::Parent(child)) => Pid::from_raw(child as i32),
Err(err) => panic!("fork() failed: {err}"),
};
let output = trace(pid, args.file_to_print)?;
let lines = str::from_utf8(&output)?;
ui.max_lines = lines.split('\n').count();
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();
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(())
}
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') => {
if ui.scroll < (ui.max_lines - ui.height + 1) {
ui.scroll += 1;
}
}
KeyCode::Char('J') => {
ui.scroll = ui.max_lines - ui.height + 1;
}
KeyCode::Char('k') => {
if ui.scroll > 1 {
ui.scroll -= 1;
}
}
KeyCode::Char('K') => {
ui.scroll = ui.height;
}
_ => {}
}
}
}
}
Ok(false)
}
|
