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mod trace;
mod ui;
use std::{
io::{self, Write},
str,
};
use crate::trace::{exec, trace};
use crate::ui::run_tui;
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>,
/// If defined, it hides the TUI
#[arg(long = "no-tui", default_value_t = false)]
no_tui: bool,
}
/// 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<()> {
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)?.trim();
if !args.no_tui {
let _ = run_tui(pid, lines)?;
} else {
writeln!(io::stdout(), "{lines}")?;
}
Ok(())
}
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