pandora_lib_promethion/src/io/writers.rs

use std::{
    fs::{self, File, OpenOptions},
    path::Path,
};

use anyhow::Context;
use bgzip::{BGZFWriter, Compression};
use log::info;

pub fn get_gz_writer(path: &str, force: bool) -> anyhow::Result<BGZFWriter<File>> {
    if !path.ends_with(".gz") {
        anyhow::bail!("The file should end with gz");
    }

    if force && Path::new(path).exists() {
        fs::remove_file(path).with_context(|| anyhow::anyhow!("Failed to remove file: {path}"))?;
    }

    let file = OpenOptions::new()
        .write(true) // Open the file for writing
        .create_new(true)
        .truncate(true)
        .open(path)
        .with_context(|| anyhow::anyhow!("failed to open the file: {path}"))?;

    info!("Writing into {path}");
    Ok(BGZFWriter::new(file, Compression::default()))
}