//! See <https://github.com/matklad/cargo-xtask/>.
//!
//! This binary defines various auxiliary build commands, which are not
//! expressible with just `cargo`.
//!
//! This binary is integrated into the `cargo` command line by using an alias in
//! `.cargo/config`.

#![warn(
    rust_2018_idioms,
    unused_lifetimes,
    semicolon_in_expressions_from_macros
)]

mod flags;

mod dist;

use std::{
    env,
    path::{Path, PathBuf},
};
use xshell::Shell;

fn main() -> anyhow::Result<()> {
    let flags = flags::Xtask::from_env_or_exit();

    let sh = &Shell::new()?;
    sh.change_dir(project_root());

    match flags.subcommand {
        flags::XtaskCmd::Dist(cmd) => cmd.run(sh),
    }
}

fn project_root() -> PathBuf {
    Path::new(
        &env::var("CARGO_MANIFEST_DIR").unwrap_or_else(|_| env!("CARGO_MANIFEST_DIR").to_owned()),
    )
    .ancestors()
    .nth(1)
    .unwrap()
    .to_path_buf()
}