(interfaces)=

# Rust, Fortran, and Ruby interfaces

The Fortran, and Ruby interfaces are expected to work at a certain
level, but not supported as well as the Python interface.

## Fortran interface

Fortran interface [spglib.f90](https://github.com/spglib/spglib/blob/master/example/example.f90) is found
in [example](https://github.com/spglib/spglib/tree/master/example) directory.
This fortran interface is originally contributed by Dimitar Pashov and has been
updated by some other people.
[spglib_f.c](https://github.com/spglib/spglib/blob/master/src/spglib_f.c) is
obsolete and is not recommended to use.

## Rust interface

Rust interface contributed by Seaton Ullberg. The documentation is
found at <https://docs.rs/crate/spglib/>.

## Ruby interface

Note that this ruby interface was written in ancient times, so may not
work with the recent ruby.

The ruby script `symPoscar.rb` in `ruby` directory reads a VASP
POSCAR formatted file and finds the space-group type. The `-l`
option refines a slightly distorted structure within tolerance
specified with the `-s` option. The `-o` option gives the symmetry
operations of the input structure.

```bash
% ruby symPoscar.rb POSCAR -s 0.1 -o -l
```

Some more options are shown with `--help` option:

```bash
% ruby symPoscar.rb --help
```

The way to compile the ruby module is explained in
[ruby/README](https://github.com/spglib/spglib/blob/master/ruby/README).