Function get_migrator_filepath

sea-orm-cli/src/commands/migrate.rs:203–210

`get_migrator_filepath` looks for a file `migration_dir/src/lib.rs` and returns that path if found. If `src` is not found, it will look directly in `migration_dir` for `lib.rs`. If `lib.rs` is not found, it will look for `mod.rs` instead, e.g. `migration_dir/mod.rs`. This way, `src` doesn't need to be appended in the standard case where migrations are in their own crate (with a file `lib.rs`).

(migration_dir: &str)

/// migrations are in a submodule of another crate (with a file `mod.rs`),
/// `migration_dir` can point directly to that module.
fn get_migrator_filepath(migration_dir: &str) -> PathBuf {
    let full_migration_dir = get_full_migration_dir(migration_dir);
    let with_lib = full_migration_dir.join("lib.rs");
    match () {
        _ if with_lib.is_file() => with_lib,
        _ => full_migration_dir.join("mod.rs"),
    }
}

fn update_migrator(migration_name: &str, migration_dir: &str) -> Result<(), Box<dyn Error>> {
    let migrator_filepath = get_migrator_filepath(migration_dir);