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//! Functions for saving and removing intermediate [work products].
//!
//! [work products]: WorkProduct

use crate::persist::fs::*;
use rustc_fs_util::link_or_copy;
use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
use rustc_session::Session;
use std::fs as std_fs;
use std::path::Path;

/// Copies a CGU work product to the incremental compilation directory, so next compilation can find and reuse it.
pub fn copy_cgu_workproduct_to_incr_comp_cache_dir(
    sess: &Session,
    cgu_name: &str,
    path: &Path,
) -> Option<(WorkProductId, WorkProduct)> {
    debug!("copy_cgu_workproduct_to_incr_comp_cache_dir({:?},{:?})", cgu_name, path);
    sess.opts.incremental.as_ref()?;

    let file_name = format!("{}.o", cgu_name);
    let path_in_incr_dir = in_incr_comp_dir_sess(sess, &file_name);
    let saved_file = match link_or_copy(path, &path_in_incr_dir) {
        Ok(_) => file_name,
        Err(err) => {
            sess.warn(&format!(
                "error copying object file `{}` to incremental directory as `{}`: {}",
                path.display(),
                path_in_incr_dir.display(),
                err
            ));
            return None;
        }
    };

    let work_product = WorkProduct { cgu_name: cgu_name.to_string(), saved_file };

    let work_product_id = WorkProductId::from_cgu_name(cgu_name);
    Some((work_product_id, work_product))
}

/// Removes files for a given work product.
pub fn delete_workproduct_files(sess: &Session, work_product: &WorkProduct) {
    let path = in_incr_comp_dir_sess(sess, &work_product.saved_file);
    match std_fs::remove_file(&path) {
        Ok(()) => {}
        Err(err) => {
            sess.warn(&format!(
                "file-system error deleting outdated file `{}`: {}",
                path.display(),
                err
            ));
        }
    }
}