cicada 1.2.2

A simple Bash-like Unix shell.
Documentation 
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use libc;

use crate::builtins::utils::print_stderr_with_capture;
use crate::jobc;
use crate::shell::{self, Shell};
use crate::types::{Command, CommandLine, CommandResult};

pub fn run(sh: &mut Shell, cl: &CommandLine, cmd: &Command, capture: bool) -> CommandResult {
    let tokens = cmd.tokens.clone();
    let mut cr = CommandResult::new();

    if sh.jobs.is_empty() {
        let info = "cicada: fg: no job found";
        print_stderr_with_capture(info, &mut cr, cl, cmd, capture);
        return cr;
    }

    let mut job_id = -1;
    if tokens.len() == 1 {
        if let Some((gid, _)) = sh.jobs.iter().next() {
            job_id = *gid;
        }
    }

    if tokens.len() >= 2 {
        let mut job_str = tokens[1].1.clone();
        if job_str.starts_with("%") {
            job_str = job_str.trim_start_matches('%').to_string();
        }

        match job_str.parse::<i32>() {
            Ok(n) => job_id = n,
            Err(_) => {
                let info = "cicada: fg: invalid job id";
                print_stderr_with_capture(info, &mut cr, cl, cmd, capture);
                return cr;
            }
        }
    }

    if job_id == -1 {
        let info = "cicada: not job id found";
        print_stderr_with_capture(info, &mut cr, cl, cmd, capture);
        return cr;
    }

    let gid: i32;
    let pid_list: Vec<i32>;

    {
        let mut result = sh.get_job_by_id(job_id);
        // fall back to find job by using prcess group id
        if result.is_none() {
            result = sh.get_job_by_gid(job_id);
        }

        match result {
            Some(job) => {
                print_stderr_with_capture(&job.cmd, &mut cr, cl, cmd, capture);
                cr.status = 0;

                unsafe {
                    if !shell::give_terminal_to(job.gid) {
                        return CommandResult::error();
                    }

                    libc::killpg(job.gid, libc::SIGCONT);
                    pid_list = job.pids.clone();
                    gid = job.gid;
                }
            }
            None => {
                let info = "cicada: fg: no such job";
                print_stderr_with_capture(info, &mut cr, cl, cmd, capture);
                return cr;
            }
        }
    }

    unsafe {
        jobc::mark_job_as_running(sh, gid, false);

        let cr = jobc::wait_fg_job(sh, gid, &pid_list);

        let gid_shell = libc::getpgid(0);
        if !shell::give_terminal_to(gid_shell) {
            log!("failed to give term to back to shell : {}", gid_shell);
        }

        cr
    }
}