Function get_full_migration_dir

sea-orm-cli/src/commands/migrate.rs:170–177

`get_full_migration_dir` looks for a `src` directory inside of `migration_dir` and appends that to the returned path if found. Otherwise, `migration_dir` can point directly to a directory containing the migrations. In that case, nothing is appended. This way, `src` doesn't need to be appended in the standard case where migrations are in their own crate. If the migrations are in a submodule of an

(migration_dir: &str)

/// migrations are in their own crate. If the migrations are in a submodule
/// of another crate, `migration_dir` can point directly to that module.
fn get_full_migration_dir(migration_dir: &str) -> PathBuf {
    let without_src = Path::new(migration_dir).to_owned();
    let with_src = without_src.join("src");
    match () {
        _ if with_src.is_dir() => with_src,
        _ => without_src,
    }
}

fn create_new_migration(migration_name: &str, migration_dir: &str) -> Result<(), Box<dyn Error>> {
    let migration_filepath =