//! `oxy`: command-line interface for Oxygen.
//!
//! Command definitions and dispatch live in `cli`; each command group has
//! its own module there.

mod cli;

#[cfg(feature = "alloc-stats")]
#[global_allocator]
static ALLOC: oxy_core::alloc_stats::Counting = oxy_core::alloc_stats::Counting;

// Many small allocations from every thread (paths, entries, atoms): mimalloc
// serves them from per-thread pages without the arena locks of glibc's.
#[cfg(not(feature = "alloc-stats"))]
#[global_allocator]
static ALLOC: mimalloc::MiMalloc = mimalloc::MiMalloc;

fn main() {
    // Behave like other CLI tools when output is piped into `head`: die
    // quietly on SIGPIPE instead of panicking on a failed write.
    #[cfg(unix)]
    unsafe {
        libc::signal(libc::SIGPIPE, libc::SIG_DFL);
    }
    // With the counting allocator (over glibc's): glibc gives each thread
    // that allocates an arena of its own and keeps what is freed there: the
    // first commit of the Linux tree, read and hashed across threads, held
    // 4.3 GB for 2.7 GB in use. Two arenas hold 3.1 GB, no slower.
    // MALLOC_ARENA_MAX still has the last word.
    #[cfg(all(target_os = "linux", target_env = "gnu", feature = "alloc-stats"))]
    if std::env::var_os("MALLOC_ARENA_MAX").is_none() {
        unsafe {
            libc::mallopt(libc::M_ARENA_MAX, 2);
        }
    }
    let command = oxy_core::timing::phase("command");
    let result = cli::run();
    if result.is_ok() {
        cli::after_command();
    }
    drop(command);
    oxy_core::timing::memory_summary();
    match result {
        Ok(code) => std::process::exit(code),
        Err(e) => {
            cli::ui::init(false);
            eprintln!("{} {e:#}", cli::ui::err("error:"));
            std::process::exit(1);
        }
    }
}