// This file is part of the "lamp" program.
//     Copyright (C) 2022  crapStone
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use std::{
    fs,
    io::{self, Error},
    path::PathBuf,
};

use clap_complete::{generate_to, shells, Generator};

include!("src/cli.rs");

const OUTDIR: &str = "target/completions";

fn main() -> Result<(), Error> {
    let mut cmd = build_cli();

    if let Err(why) = fs::create_dir(OUTDIR) {
        if why.kind() != io::ErrorKind::AlreadyExists {
            eprintln!("cargo:error=could not create directory: {OUTDIR}");
            return Err(why);
        }
    }

    let path = generate_completions(shells::Bash, &mut cmd)?;
    println!("cargo:debug=completion file is generated: {path:?}");
    let path = generate_completions(shells::Zsh, &mut cmd)?;
    println!("cargo:debug=completion file is generated: {path:?}");
    let path = generate_completions(shells::Fish, &mut cmd)?;
    println!("cargo:debug=completion file is generated: {path:?}");

    Ok(())
}

fn generate_completions<G: Generator>(shell: G, cmd: &mut clap::Command) -> Result<PathBuf, Error> {
    generate_to(shell, cmd, env!("CARGO_PKG_NAME"), OUTDIR)
}